[syzbot] [block?] [trace?] INFO: task hung in blk_trace_ioctl (4)

From: syzbot
Date: Thu Nov 30 2023 - 16:17:59 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 8c9660f65153 Add linux-next specific files for 20231124
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1006f178e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=ca1e8655505e280
dashboard link: https://syzkaller.appspot.com/bug?extid=ed812ed461471ab17a0c
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14ec6e62e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11964f7ce80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/345ed4af3a0d/disk-8c9660f6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/191053c69d57/vmlinux-8c9660f6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/aac7ee5e55e0/bzImage-8c9660f6.xz

The issue was bisected to:

commit 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef
Author: Pengfei Xu <pengfei.xu@xxxxxxxxx>
Date: Mon Jul 31 03:04:18 2023 +0000

x86/kernel: increase kcov coverage under arch/x86/kernel folder

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14782eaae80000
final oops: https://syzkaller.appspot.com/x/report.txt?x=16782eaae80000
console output: https://syzkaller.appspot.com/x/log.txt?x=12782eaae80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ed812ed461471ab17a0c@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 0d345996e4cb ("x86/kernel: increase kcov coverage under arch/x86/kernel folder")

INFO: task syz-executor216:5234 blocked for more than 143 seconds.
Not tainted 6.7.0-rc2-next-20231124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor216 state:D stack:29104 pid:5234 tgid:5232 ppid:5106 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5399 [inline]
__schedule+0xf15/0x5c00 kernel/sched/core.c:6726
__schedule_loop kernel/sched/core.c:6801 [inline]
schedule+0xe7/0x270 kernel/sched/core.c:6816
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6873
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x5b4/0x9c0 kernel/locking/mutex.c:747
blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
blkdev_common_ioctl+0x1575/0x1ce0 block/ioctl.c:562
blkdev_ioctl+0x249/0x770 block/ioctl.c:627
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f914d80ca89
RSP: 002b:00007f914cfa3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f914d89c1d8 RCX: 00007f914d80ca89
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004
RBP: 00007f914d89c1d0 R08: 00007ffdb3560fd7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f914d89c1dc
R13: 000000000000006e R14: 00007ffdb3560ef0 R15: 00007ffdb3560fd8
</TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cfacf60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8cfacf60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8cfacf60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
1 lock held by klogd/4501:
#0: ffff8880b993c718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
2 locks held by getty/4815:
#0: ffff8880273ee0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc4/0x1490 drivers/tty/n_tty.c:2201
2 locks held by kworker/0:5/5180:
2 locks held by syz-executor216/5233:
1 lock held by syz-executor216/5234:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5240:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5241:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5245:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5246:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5248:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5249:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5251:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5252:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5254:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736
1 lock held by syz-executor216/5255:
#0: ffff888142f94490 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0xc9/0x290 kernel/trace/blktrace.c:736

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc2-next-20231124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf86/0x1210 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5233 Comm: syz-executor216 Not tainted 6.7.0-rc2-next-20231124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__sanitizer_cov_trace_switch+0x4f/0x90 kernel/kcov.c:341
Code: 83 f8 10 75 2f 41 bd 03 00 00 00 4c 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 4c 89 e2 4c 89 ef 48 83 c3 01 48 8b 4c 24 28 <e8> 2c fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e c3 48 83 f8
RSP: 0018:ffffc90003fdf3a0 EFLAGS: 00000202
RAX: 0000000000000008 RBX: 0000000000000001 RCX: ffffffff813a44c8
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffffff8ac9d800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: dffffc0000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000003 R15: 0000000000000001
FS: 00007f914cfc46c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f914d899f18 CR3: 00000000a0ad4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
unwind_next_frame+0xea8/0x2390 arch/x86/kernel/unwind_orc.c:641
arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
save_stack+0x15e/0x1f0 mm/page_owner.c:130
__set_page_owner+0x1f/0x60 mm/page_owner.c:196
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa16/0x3690 mm/page_alloc.c:3344
__alloc_pages+0x22d/0x2400 mm/page_alloc.c:4600
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
relay_alloc_buf kernel/relay.c:121 [inline]
relay_create_buf kernel/relay.c:162 [inline]
relay_open_buf.part.0+0x27d/0xba0 kernel/relay.c:384
relay_open_buf kernel/relay.c:536 [inline]
relay_open+0x641/0xab0 kernel/relay.c:517
do_blk_trace_setup+0x4a9/0xaa0 kernel/trace/blktrace.c:591
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:631
blk_trace_ioctl+0x163/0x290 kernel/trace/blktrace.c:741
blkdev_ioctl+0x111/0x770 block/ioctl.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f914d80ca89
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 1c 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f914cfc4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f914d89c1c8 RCX: 00007f914d80ca89
RDX: 0000000020000380 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 00007f914d89c1c0 R08: 00007f914cfc46c0 R09: 0000000000000000
R10: 00007f914cfc46c0 R11: 0000000000000246 R12: 00007f914d89c1cc
R13: 000000000000000b R14: 00007ffdb3560ef0 R15: 00007ffdb3560fd8
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.100 msecs

---
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Next message: Vladimir Oltean: "Re: [PATCH v6 net-next 6/7] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support"
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