[BUG] selftests: memfd: run_hugetlbfs_test.sh: Hang in fuse_mnt?

From: Mirsad Todorovac
Date: Sat Jan 06 2024 - 22:03:56 EST

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Hi all,

I'm running the 6.7.0-rc8-00174-g95c8a35f1c01 kernel from torvalds tree on
a Ubuntu 23.10 Mantic Minotaur system.

What I get are these errors. memfd selftests are actually counted as "ok", but
they give errors and/or hang.

Please find the strace output attached, and the config used.

Hope this helps.

Best regards,
Mirsad

TAP version 13
1..3
# timeout set to 45
# selftests: memfd: memfd_test
# memfd: CREATE
# memfd: BASIC
# memfd: SEAL-EXEC
# memfd: Apply SEAL_EXEC
# memfd: Apply ALL_SEALS
# memfd: EXEC_NO_SEAL
# memfd: NOEXEC_SEAL
# memfd: SEAL-WRITE
# memfd: SEAL-FUTURE-WRITE
# memfd: SEAL-SHRINK
# memfd: SEAL-GROW
# memfd: SEAL-RESIZE
# memfd: sysctl 0
# memfd: sysctl 1
# memfd: sysctl 0
# memfd: sysctl 2
# memfd: sysctl 1
# memfd: sysctl 0
# memfd: nested sysctl 0
# memfd: sysctl 0
# memfd: sysctl 1
# memfd: sysctl 0
# memfd: sysctl 2
# memfd: sysctl 1
# memfd: sysctl 0
# memfd: nested sysctl 1
# memfd: nested sysctl 2
# memfd: nested sysctl 0 -> 1 after fork
# memfd: nested sysctl 0 -> 2 after fork
# memfd: nested sysctl 2 -> 1 after fork
# memfd: nested sysctl 2 -> 0 after fork
# memfd: nested sysctl 1 -> 0 after fork
# memfd: SHARE-DUP
# memfd: SHARE-MMAP
# memfd: SHARE-OPEN
# memfd: SHARE-FORK
# memfd: SHARE-DUP (shared file-table)
# memfd: SHARE-MMAP (shared file-table)
# memfd: SHARE-OPEN (shared file-table)
# memfd: SHARE-FORK (shared file-table)
# memfd: DONE
ok 1 selftests: memfd: memfd_test
# timeout set to 45
# selftests: memfd: run_fuse_test.sh
# fusermount: failed to unmount /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt: Invalid argument
# opening: ./mnt/memfd
# fuse: DONE
ok 2 selftests: memfd: run_fuse_test.sh
# timeout set to 45
# selftests: memfd: run_hugetlbfs_test.sh
# memfd-hugetlb: CREATE
# memfd-hugetlb: BASIC
# memfd-hugetlb: SEAL-EXEC
# memfd-hugetlb: Apply SEAL_EXEC
# fchmod(/memfd:kern_memfd_seal_exec (deleted), 00777) didn't fail as expected
# ./run_hugetlbfs_test.sh: line 60: 97095 Aborted (core dumped) ./memfd_test hugetlbfs
# opening: ./mnt/memfd
# ADD_SEALS(6, 0 -> 8) failed: Device or resource busy
# 8 != 0 = GET_SEALS(6)
# Aborted (core dumped)
ok 3 selftests: memfd: run_hugetlbfs_test.sh
make[3]: Leaving directory '/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd'

--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu

System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union

"I see something approaching fast ... Will it be friends with me?"

Attachment: config-6.7.0-rc8-00174-g95c8a35f1c01-dirty.xz
Description: application/xz

execve("./memfd_test", ["./memfd_test", "hugetlbfs"], 0x7ffee65a0320 /* 33 vars */) = 0
brk(NULL) = 0x60292aea3000
arch_prctl(0x3001 /* ARCH_??? */, 0x7fff9507ab80) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x74491887f000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=94833, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 94833, PROT_READ, MAP_PRIVATE, 3, 0) = 0x744918867000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\202\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2105184, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2150256, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x744918600000
mmap(0x744918626000, 1568768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x744918626000
mmap(0x7449187a5000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a5000) = 0x7449187a5000
mmap(0x7449187fa000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f9000) = 0x7449187fa000
mmap(0x744918800000, 53104, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x744918800000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x744918864000
arch_prctl(ARCH_SET_FS, 0x744918864740) = 0
set_tid_address(0x744918864a10) = 904232
set_robust_list(0x744918864a20, 24) = 0
rseq(0x744918865060, 0x20, 0, 0x53053053) = 0
mprotect(0x7449187fa000, 16384, PROT_READ) = 0
mprotect(0x6029299c0000, 4096, PROT_READ) = 0
mprotect(0x7449188b6000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x744918867000, 94833) = 0
getrandom("\xb7\x1c\x51\x09\x52\xb0\x9e\x86", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x60292aea3000
brk(0x60292aec4000) = 0x60292aec4000
openat(AT_FDCWD, "/proc/meminfo", O_RDONLY) = 3
newfstatat(3, "", {st_mode=S_IFREG|0444, st_size=0, ...}, AT_EMPTY_PATH) = 0
read(3, "MemTotal: 7916376 kB\nMemF"..., 1024) = 1024
read(3, " 68108 kB\nVmallocChunk: "..., 1024) = 507
close(3) = 0
newfstatat(1, "", {st_mode=S_IFIFO|0600, st_size=0, ...}, AT_EMPTY_PATH) = 0
memfd_create(NULL, MFD_HUGETLB) = -1 EFAULT (Bad address)
memfd_create("\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"..., MFD_HUGETLB) = -1 EINVAL (Invalid argument)
memfd_create("\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"..., MFD_HUGETLB) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_HUGETLB) = 3
ftruncate(3, 0) = 0
close(3) = 0
memfd_create("", MFD_HUGETLB|0x100) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_ALLOW_SEALING|MFD_HUGETLB|MFD_NOEXEC_SEAL|MFD_EXEC|0x3ffffe0|63<<MFD_HUGE_SHIFT) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_CLOEXEC|MFD_HUGETLB|MFD_NOEXEC_SEAL|MFD_EXEC|0x3ffffe0|63<<MFD_HUGE_SHIFT) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB|MFD_NOEXEC_SEAL|MFD_EXEC|0x3ffffe0|63<<MFD_HUGE_SHIFT) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_HUGETLB|32<<MFD_HUGE_SHIFT) = -1 ENODEV (No such device)
memfd_create("", MFD_HUGETLB|MFD_NOEXEC_SEAL|MFD_EXEC) = -1 EINVAL (Invalid argument)
memfd_create("", MFD_CLOEXEC|MFD_HUGETLB) = 3
ftruncate(3, 0) = 0
close(3) = 0
memfd_create("", MFD_ALLOW_SEALING|MFD_HUGETLB) = 3
ftruncate(3, 0) = 0
close(3) = 0
memfd_create("", MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB) = 3
ftruncate(3, 0) = 0
close(3) = 0
memfd_create("kern_memfd_basic", MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB) = 3
ftruncate(3, 4194304) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0
fcntl(3, F_GET_SEALS) = 0
fcntl(3, F_ADD_SEALS, F_SEAL_SHRINK|F_SEAL_WRITE) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0xa (seals F_SEAL_SHRINK|F_SEAL_WRITE)
fcntl(3, F_GET_SEALS) = 0xa (seals F_SEAL_SHRINK|F_SEAL_WRITE)
fcntl(3, F_ADD_SEALS, F_SEAL_SHRINK|F_SEAL_WRITE) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0xa (seals F_SEAL_SHRINK|F_SEAL_WRITE)
fcntl(3, F_GET_SEALS) = 0xa (seals F_SEAL_SHRINK|F_SEAL_WRITE)
fcntl(3, F_ADD_SEALS, F_SEAL_SEAL|F_SEAL_GROW) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0xf (seals F_SEAL_SEAL|F_SEAL_SHRINK|F_SEAL_GROW|F_SEAL_WRITE)
fcntl(3, F_GET_SEALS) = 0xf (seals F_SEAL_SEAL|F_SEAL_SHRINK|F_SEAL_GROW|F_SEAL_WRITE)
fcntl(3, F_ADD_SEALS, F_SEAL_GROW) = -1 EPERM (Operation not permitted)
fcntl(3, F_GET_SEALS) = 0xf (seals F_SEAL_SEAL|F_SEAL_SHRINK|F_SEAL_GROW|F_SEAL_WRITE)
fcntl(3, F_ADD_SEALS, 0) = -1 EPERM (Operation not permitted)
close(3) = 0
memfd_create("kern_memfd_basic", MFD_CLOEXEC|MFD_HUGETLB) = 3
ftruncate(3, 4194304) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0x1 (seals F_SEAL_SEAL)
fcntl(3, F_GET_SEALS) = 0x1 (seals F_SEAL_SEAL)
fcntl(3, F_ADD_SEALS, F_SEAL_SHRINK|F_SEAL_GROW|F_SEAL_WRITE) = -1 EPERM (Operation not permitted)
readlink("/proc/self/fd/3", "/memfd:kern_memfd_basic (deleted"..., 4095) = 33
fcntl(3, F_GET_SEALS) = 0x1 (seals F_SEAL_SEAL)
close(3) = 0
memfd_create("kern_memfd_seal_exec", MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB|MFD_EXEC) = 3
ftruncate(3, 4194304) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
newfstatat(3, "", {st_mode=S_IFREG|0777, st_size=4194304, ...}, AT_EMPTY_PATH) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
fchmod(3, 0644) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=4194304, ...}, AT_EMPTY_PATH) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
fcntl(3, F_GET_SEALS) = 0
fcntl(3, F_GET_SEALS) = 0
fcntl(3, F_ADD_SEALS, F_SEAL_EXEC) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
fcntl(3, F_GET_SEALS) = 0x20 (seals F_SEAL_EXEC)
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
fchmod(3, 0600) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
newfstatat(3, "", {st_mode=S_IFREG|0600, st_size=4194304, ...}, AT_EMPTY_PATH) = 0
readlink("/proc/self/fd/3", "/memfd:kern_memfd_seal_exec (del"..., 4095) = 37
newfstatat(3, "", {st_mode=S_IFREG|0600, st_size=4194304, ...}, AT_EMPTY_PATH) = 0
fchmod(3, 0777) = 0
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
gettid() = 904232
getpid() = 904232
tgkill(904232, 904232, SIGABRT) = 0
--- SIGABRT {si_signo=SIGABRT, si_code=SI_TKILL, si_pid=904232, si_uid=0} ---
+++ killed by SIGABRT (core dumped) +++
./run_hugetlbfs_test.sh: line 60: 904229 Aborted (core dumped) strace -f ./memfd_test hugetlbfs
execve("./fuse_mnt", ["./fuse_mnt", "./mnt"], 0x7fff1de19420 /* 33 vars */) = 0
brk(NULL) = 0x64d97e678000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffdfc3cbca0) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1f97000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=94833, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 94833, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd6b1f7f000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libfuse.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=260376, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 258336, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fd6b1f3f000
mmap(0x7fd6b1f46000, 114688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7fd6b1f46000
mmap(0x7fd6b1f62000, 40960, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x23000) = 0x7fd6b1f62000
mmap(0x7fd6b1f6c000, 77824, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2d000) = 0x7fd6b1f6c000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\202\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2105184, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2150256, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fd6b1c00000
mmap(0x7fd6b1c26000, 1568768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7fd6b1c26000
mmap(0x7fd6b1da5000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a5000) = 0x7fd6b1da5000
mmap(0x7fd6b1dfa000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f9000) = 0x7fd6b1dfa000
mmap(0x7fd6b1e00000, 53104, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1e00000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1f3c000
arch_prctl(ARCH_SET_FS, 0x7fd6b1f3c740) = 0
set_tid_address(0x7fd6b1f3ca10) = 904244
set_robust_list(0x7fd6b1f3ca20, 24) = 0
rseq(0x7fd6b1f3d060, 0x20, 0, 0x53053053) = 0
mprotect(0x7fd6b1dfa000, 16384, PROT_READ) = 0
mprotect(0x7fd6b1f6c000, 73728, PROT_READ) = 0
mprotect(0x64d97cbef000, 4096, PROT_READ) = 0
mprotect(0x7fd6b1fce000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7fd6b1f7f000, 94833) = 0
getrandom("\x35\xc8\x94\xf8\x1b\x18\xe2\x21", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x64d97e678000
brk(0x64d97e699000) = 0x64d97e699000
getcwd("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd", 1024) = 71
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", 0x7ffdfc3ca680, 1023) = -1 EINVAL (Invalid argument)
openat(AT_FDCWD, "/dev/null", O_RDWR) = 3
close(3) = 0
newfstatat(AT_FDCWD, "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
openat(AT_FDCWD, "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=4096, ...}, AT_EMPTY_PATH) = 0
getdents64(3, 0x64d97e6784d0 /* 2 entries */, 32768) = 48
getdents64(3, 0x64d97e6784d0 /* 0 entries */, 32768) = 0
close(3) = 0
openat(AT_FDCWD, "/dev/fuse", O_RDWR) = 3
getgid() = 0
getuid() = 0
mount("fuse_mnt", "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", "fuse.fuse_mnt", MS_NOSUID|MS_NODEV, "fd=3,rootmode=40000,user_id=0,gr"...) = 0
geteuid() = 0
readlink("/home", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd", 0x7ffdfc3ca540, 1023) = -1 EINVAL (Invalid argument)
newfstatat(AT_FDCWD, "/etc/mtab", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0
getuid() = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1f96000
pipe2([4, 5], 0) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 904246 attached
, child_tidptr=0x7fd6b1f3ca10) = 904246
[pid 904246] set_robust_list(0x7fd6b1f3ca20, 24) = 0
[pid 904244] read(4, <unfinished ...>
[pid 904246] setsid() = 904246
[pid 904246] chdir("/") = 0
[pid 904246] openat(AT_FDCWD, "/dev/null", O_RDWR) = 6
[pid 904246] dup2(6, 0) = 0
[pid 904246] dup2(6, 1) = 1
[pid 904246] dup2(6, 2) = 2
[pid 904246] close(6) = 0
[pid 904246] write(5, "\1", 1 <unfinished ...>
[pid 904244] <... read resumed>"\1", 1) = 1
[pid 904246] <... write resumed>) = 1
[pid 904244] exit_group(0 <unfinished ...>
[pid 904246] close(4 <unfinished ...>
[pid 904244] <... exit_group resumed>) = ?
[pid 904246] <... close resumed>) = 0
[pid 904244] +++ exited with 0 +++
close(5) = 0
rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x7fd6b1f5a1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fd6b1c42910}, NULL, 8) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x7fd6b1f5a1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fd6b1c42910}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x7fd6b1f5a1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fd6b1c42910}, NULL, 8) = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fd6b1c42910}, NULL, 8) = 0
mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1f1a000
rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM], [], 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7fd6b1c94820, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fd6b1c42910}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd6b1200000
mprotect(0x7fd6b1201000, 8388608, PROT_READ|PROT_WRITE) = 0
rt_sigprocmask(SIG_BLOCK, ~[], [HUP INT QUIT TERM], 8) = 0
clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fd6b1a00990, parent_tid=0x7fd6b1a00990, exit_signal=0, stack=0x7fd6b1200000, stack_size=0x7fff80, tls=0x7fd6b1a006c0}strace: Process 904247 attached
=> {parent_tid=[904247]}, 88) = 904247
[pid 904247] rseq(0x7fd6b1a00fe0, 0x20, 0, 0x53053053 <unfinished ...>
[pid 904246] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], <unfinished ...>
[pid 904247] <... rseq resumed>) = 0
[pid 904247] set_robust_list(0x7fd6b1a009a0, 24) = 0
[pid 904247] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], NULL, 8) = 0
[pid 904247] read(3, "h\0\0\0\32\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 135168) = 104
[pid 904247] futex(0x7ffdfc3cbba0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 904246] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 904246] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 904246] futex(0x7ffdfc3cbba0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 904247] <... futex resumed>) = 0
[pid 904246] <... futex resumed>) = 1
[pid 904247] mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6a9000000
[pid 904246] futex(0x7ffdfc3cbc10, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
[pid 904247] munmap(0x7fd6a9000000, 50331648) = 0
[pid 904247] munmap(0x7fd6b0000000, 16777216) = 0
[pid 904247] mprotect(0x7fd6ac000000, 135168, PROT_READ|PROT_WRITE) = 0
[pid 904247] mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd6b1ef8000
[pid 904247] rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM], [HUP INT QUIT TERM], 8) = 0
[pid 904247] mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd6b0800000
[pid 904247] mprotect(0x7fd6b0801000, 8388608, PROT_READ|PROT_WRITE) = 0
[pid 904247] rt_sigprocmask(SIG_BLOCK, ~[], [HUP INT QUIT TERM], 8) = 0
[pid 904247] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fd6b1000990, parent_tid=0x7fd6b1000990, exit_signal=0, stack=0x7fd6b0800000, stack_size=0x7fff80, tls=0x7fd6b10006c0}strace: Process 904248 attached
<unfinished ...>
[pid 904248] rseq(0x7fd6b1000fe0, 0x20, 0, 0x53053053 <unfinished ...>
[pid 904247] <... clone3 resumed> => {parent_tid=[904248]}, 88) = 904248
[pid 904248] <... rseq resumed>) = 0
[pid 904247] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], <unfinished ...>
[pid 904248] set_robust_list(0x7fd6b10009a0, 24 <unfinished ...>
[pid 904247] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 904248] <... set_robust_list resumed>) = 0
[pid 904247] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], <unfinished ...>
[pid 904248] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], <unfinished ...>
[pid 904247] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 904248] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 904247] futex(0x7ffdfc3cbba0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 904248] read(3, <unfinished ...>
[pid 904247] <... futex resumed>) = 0
[pid 904247] writev(3, [{iov_base="(\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0", iov_len=16}, {iov_base="\7\0\0\0\23\0\0\0\0\0\2\0\21\0\0\0\0\0\0\0\0\0\2\0", iov_len=24}], 2) = 40
[pid 904247] read(3, execve("./fuse_mnt", ["./fuse_mnt", "./mnt"], 0x7fff66359b10 /* 33 vars */) = 0
brk(NULL) = 0x62f4c0b16000
arch_prctl(0x3001 /* ARCH_??? */, 0x7fff57e48ff0) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a248434c000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=94833, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 94833, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7a2484334000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libfuse.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=260376, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 258336, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7a24842f4000
mmap(0x7a24842fb000, 114688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7a24842fb000
mmap(0x7a2484317000, 40960, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x23000) = 0x7a2484317000
mmap(0x7a2484321000, 77824, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2d000) = 0x7a2484321000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\202\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2105184, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2150256, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7a2484000000
mmap(0x7a2484026000, 1568768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7a2484026000
mmap(0x7a24841a5000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a5000) = 0x7a24841a5000
mmap(0x7a24841fa000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f9000) = 0x7a24841fa000
mmap(0x7a2484200000, 53104, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7a2484200000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a24842f1000
arch_prctl(ARCH_SET_FS, 0x7a24842f1740) = 0
set_tid_address(0x7a24842f1a10) = 904048
set_robust_list(0x7a24842f1a20, 24) = 0
rseq(0x7a24842f2060, 0x20, 0, 0x53053053) = 0
mprotect(0x7a24841fa000, 16384, PROT_READ) = 0
mprotect(0x7a2484321000, 73728, PROT_READ) = 0
mprotect(0x62f4c0a65000, 4096, PROT_READ) = 0
mprotect(0x7a2484383000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7a2484334000, 94833) = 0
getrandom("\x3e\xc9\xaa\x7d\x79\x40\xd4\xce", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x62f4c0b16000
brk(0x62f4c0b37000) = 0x62f4c0b37000
getcwd("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd", 1024) = 71
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", 0x7fff57e479d0, 1023) = -1 EINVAL (Invalid argument)
openat(AT_FDCWD, "/dev/null", O_RDWR) = 3
close(3) = 0
newfstatat(AT_FDCWD, "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
openat(AT_FDCWD, "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=4096, ...}, AT_EMPTY_PATH) = 0
getdents64(3, 0x62f4c0b164d0 /* 2 entries */, 32768) = 48
getdents64(3, 0x62f4c0b164d0 /* 0 entries */, 32768) = 0
close(3) = 0
openat(AT_FDCWD, "/dev/fuse", O_RDWR) = 3
getgid() = 0
getuid() = 0
mount("fuse_mnt", "/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd/mnt", "fuse.fuse_mnt", MS_NOSUID|MS_NODEV, "fd=3,rootmode=40000,user_id=0,gr"...) = 0
geteuid() = 0
readlink("/home", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
readlink("/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/memfd", 0x7fff57e47890, 1023) = -1 EINVAL (Invalid argument)
newfstatat(AT_FDCWD, "/etc/mtab", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0
getuid() = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a248434b000
pipe2([4, 5], 0) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7a24842f1a10) = 904050
strace: Process 904050 attached
[pid 904048] read(4, <unfinished ...>
[pid 904050] set_robust_list(0x7a24842f1a20, 24) = 0
[pid 904050] setsid() = 904050
[pid 904050] chdir("/") = 0
[pid 904050] openat(AT_FDCWD, "/dev/null", O_RDWR) = 6
[pid 904050] dup2(6, 0) = 0
[pid 904050] dup2(6, 1) = 1
[pid 904050] dup2(6, 2) = 2
[pid 904050] close(6) = 0
[pid 904050] write(5, "\1", 1 <unfinished ...>
[pid 904048] <... read resumed>"\1", 1) = 1
[pid 904050] <... write resumed>) = 1
[pid 904048] exit_group(0 <unfinished ...>
[pid 904050] close(4 <unfinished ...>
[pid 904048] <... exit_group resumed>) = ?
[pid 904050] <... close resumed>) = 0
[pid 904050] close(5) = 0
[pid 904050] rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 904048] +++ exited with 0 +++
rt_sigaction(SIGHUP, {sa_handler=0x7a248430f1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7a2484042910}, NULL, 8) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x7a248430f1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7a2484042910}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x7a248430f1d0, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7a2484042910}, NULL, 8) = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7a2484042910}, NULL, 8) = 0
mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a24842cf000
rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM], [], 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7a2484094820, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7a2484042910}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7a2483600000
mprotect(0x7a2483601000, 8388608, PROT_READ|PROT_WRITE) = 0
rt_sigprocmask(SIG_BLOCK, ~[], [HUP INT QUIT TERM], 8) = 0
clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7a2483e00990, parent_tid=0x7a2483e00990, exit_signal=0, stack=0x7a2483600000, stack_size=0x7fff80, tls=0x7a2483e006c0} => {parent_tid=[904051]}, 88) = 904051
rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
futex(0x7fff57e48f60, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANYstrace: Process 904051 attached
<unfinished ...>
[pid 904051] rseq(0x7a2483e00fe0, 0x20, 0, 0x53053053) = 0
[pid 904051] set_robust_list(0x7a2483e009a0, 24) = 0
[pid 904051] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], NULL, 8) = 0
[pid 904051] read(3, "h\0\0\0\32\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 135168) = 104
[pid 904051] mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a247b400000
[pid 904051] munmap(0x7a247b400000, 12582912) = 0
[pid 904051] munmap(0x7a2480000000, 54525952) = 0
[pid 904051] mprotect(0x7a247c000000, 135168, PROT_READ|PROT_WRITE) = 0
[pid 904051] mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7a24842ad000
[pid 904051] rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM], [HUP INT QUIT TERM], 8) = 0
[pid 904051] mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7a2482c00000
[pid 904051] mprotect(0x7a2482c01000, 8388608, PROT_READ|PROT_WRITE) = 0
[pid 904051] rt_sigprocmask(SIG_BLOCK, ~[], [HUP INT QUIT TERM], 8) = 0
[pid 904051] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7a2483400990, parent_tid=0x7a2483400990, exit_signal=0, stack=0x7a2482c00000, stack_size=0x7fff80, tls=0x7a24834006c0} => {parent_tid=[904052]}, 88) = 904052
strace: Process 904052 attached
[pid 904051] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], NULL, 8) = 0
[pid 904052] rseq(0x7a2483400fe0, 0x20, 0, 0x53053053 <unfinished ...>
[pid 904051] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], <unfinished ...>
[pid 904052] <... rseq resumed>) = 0
[pid 904052] set_robust_list(0x7a24834009a0, 24 <unfinished ...>
[pid 904051] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 904052] <... set_robust_list resumed>) = 0
[pid 904051] writev(3, [{iov_base="(\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0", iov_len=16}, {iov_base="\7\0\0\0\23\0\0\0\0\0\2\0\21\0\0\0\0\0\0\0\0\0\2\0", iov_len=24}], 2) = 40
[pid 904051] read(3, <unfinished ...>
[pid 904052] rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT TERM], NULL, 8) = 0
[pid 904052] read(3,

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