[syzbot] INFO: task can't die in __lock_sock

From: syzbot
Date: Sun Aug 15 2021 - 12:47:34 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 4b358aabb93a Add linux-next specific files for 20210813
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1603f181300000
kernel config: https://syzkaller.appspot.com/x/.config?x=b99612666fbe2d6a
dashboard link: https://syzkaller.appspot.com/bug?extid=7d51f807c81b190a127d
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7d51f807c81b190a127d@xxxxxxxxxxxxxxxxxxxxxxxxx

INFO: task syz-executor.4:21120 can't die for more than 143 seconds.
task:syz-executor.4 state:D stack:28448 pid:21120 ppid: 6572 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
bt_sock_wait_state+0x249/0x590 net/bluetooth/af_bluetooth.c:557
rfcomm_sock_connect+0x3a5/0x460 net/bluetooth/rfcomm/sock.c:416
__sys_connect_file+0x155/0x1a0 net/socket.c:1890
__sys_connect+0x161/0x190 net/socket.c:1907
__do_sys_connect net/socket.c:1917 [inline]
__se_sys_connect net/socket.c:1914 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1914
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fa7b02bf188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fffd83567bf R14: 00007fa7b02bf300 R15: 0000000000022000
INFO: task syz-executor.4:21120 blocked for more than 143 seconds.
Not tainted 5.14.0-rc5-next-20210813-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:28448 pid:21120 ppid: 6572 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
bt_sock_wait_state+0x249/0x590 net/bluetooth/af_bluetooth.c:557
rfcomm_sock_connect+0x3a5/0x460 net/bluetooth/rfcomm/sock.c:416
__sys_connect_file+0x155/0x1a0 net/socket.c:1890
__sys_connect+0x161/0x190 net/socket.c:1907
__do_sys_connect net/socket.c:1917 [inline]
__se_sys_connect net/socket.c:1914 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1914
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fa7b02bf188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fffd83567bf R14: 00007fa7b02bf300 R15: 0000000000022000
INFO: task syz-executor.4:21124 can't die for more than 143 seconds.
task:syz-executor.4 state:D stack:29104 pid:21124 ppid: 6572 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
rfcomm_sk_state_change+0xb4/0x390 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x1b6/0x8a0 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x1ea/0x240 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
__sys_shutdown_sock net/socket.c:2242 [inline]
__sys_shutdown_sock net/socket.c:2236 [inline]
__sys_shutdown+0xf1/0x1b0 net/socket.c:2254
__do_sys_shutdown net/socket.c:2262 [inline]
__se_sys_shutdown net/socket.c:2260 [inline]
__x64_sys_shutdown+0x50/0x70 net/socket.c:2260
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fa7b029e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007fffd83567bf R14: 00007fa7b029e300 R15: 0000000000022000
INFO: task syz-executor.4:21124 blocked for more than 143 seconds.
Not tainted 5.14.0-rc5-next-20210813-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:29104 pid:21124 ppid: 6572 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4711 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5966
schedule+0xd3/0x270 kernel/sched/core.c:6045
__lock_sock+0x13d/0x260 net/core/sock.c:2645
lock_sock_nested+0xf6/0x120 net/core/sock.c:3178
lock_sock include/net/sock.h:1612 [inline]
rfcomm_sk_state_change+0xb4/0x390 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x1b6/0x8a0 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x1ea/0x240 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931
__sys_shutdown_sock net/socket.c:2242 [inline]
__sys_shutdown_sock net/socket.c:2236 [inline]
__sys_shutdown+0xf1/0x1b0 net/socket.c:2254
__do_sys_shutdown net/socket.c:2262 [inline]
__se_sys_shutdown net/socket.c:2260 [inline]
__x64_sys_shutdown+0x50/0x70 net/socket.c:2260
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
RSP: 002b:00007fa7b029e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007fffd83567bf R14: 00007fa7b029e300 R15: 0000000000022000
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210813-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6267 Comm: in:imklog Not tainted 5.14.0-rc5-next-20210813-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 3c 15 00 00 85 c0 74 2b 8b 82 18 15 00 00 <83> f8 02 75 20 48 8b 8a 20 15 00 00 8b 92 1c 15 00 00 48 8b 01 48
RSP: 0018:ffffc9000c577648 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880775b9c80 RSI: ffffffff83f260b5 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000002f R09: 0000000000000000
R10: ffffffff83f26037 R11: 0000000000000000 R12: 0000000000000004
R13: ffffffff898ca243 R14: ffffc9008c577a4f R15: ffffc9000c577a51
FS: 00007f9245542700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a4b72b008 CR3: 000000006fe68000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
number+0x205/0xae0 lib/vsprintf.c:490
vsnprintf+0xf09/0x14f0 lib/vsprintf.c:2875
sprintf+0xc0/0x100 lib/vsprintf.c:3011
print_syslog kernel/printk/printk.c:1257 [inline]
info_print_prefix+0x2d5/0x340 kernel/printk/printk.c:1287
record_print_text+0x14d/0x3e0 kernel/printk/printk.c:1339
syslog_print+0x48c/0x580 kernel/printk/printk.c:1539
do_syslog.part.0+0x202/0x640 kernel/printk/printk.c:1658
do_syslog+0x49/0x60 kernel/printk/printk.c:1643
kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40
pde_read fs/proc/inode.c:311 [inline]
proc_reg_read+0x119/0x300 fs/proc/inode.c:321
vfs_read+0x1b5/0x600 fs/read_write.c:494
ksys_read+0x12d/0x250 fs/read_write.c:634
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9247b8522d
Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f9245521580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9247b8522d
RDX: 0000000000001fa0 RSI: 00007f9245521da0 RDI: 0000000000000004
RBP: 000055eb855a59d0 R08: 0000000000000000 R09: 0000000004000001
R10: 0000000000000001 R11: 0000000000000293 R12: 00007f9245521da0
R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f9245521dd7
----------------
Code disassembly (best guess):
0: 81 e1 00 01 00 00 and $0x100,%ecx
6: 65 48 8b 14 25 40 f0 mov %gs:0x1f040,%rdx
d: 01 00
f: a9 00 01 ff 00 test $0xff0100,%eax
14: 74 0e je 0x24
16: 85 c9 test %ecx,%ecx
18: 74 35 je 0x4f
1a: 8b 82 3c 15 00 00 mov 0x153c(%rdx),%eax
20: 85 c0 test %eax,%eax
22: 74 2b je 0x4f
24: 8b 82 18 15 00 00 mov 0x1518(%rdx),%eax
2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction
2d: 75 20 jne 0x4f
2f: 48 8b 8a 20 15 00 00 mov 0x1520(%rdx),%rcx
36: 8b 92 1c 15 00 00 mov 0x151c(%rdx),%edx
3c: 48 8b 01 mov (%rcx),%rax
3f: 48 rex.W

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