INFO: task kworker/u4:0:8 blocked for more than 172 seconds.
Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0 state:D stack:24168 pid: 8 ppid: 2 flags:0x00004000
Workqueue: events_unbound io_ring_exit_work
Call Trace:
context_switch kernel/sched/core.c:4969 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6250
schedule+0xd2/0x260 kernel/sched/core.c:6323
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6382
__mutex_lock_common kernel/locking/mutex.c:680 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
io_uring_try_cancel_iowq fs/io_uring.c:9617 [inline]
io_uring_try_cancel_requests+0x124/0x6f9 fs/io_uring.c:9647
io_ring_exit_work+0xff/0xbe8 fs/io_uring.c:9445
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Showing all locks held in the system:
3 locks held by kworker/u4:0/8:
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
#0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269
#1: ffffc90000cd7db0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273
#2: ffff8880804570a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_iowq fs/io_uring.c:9617 [inline]
#2: ffff8880804570a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_requests+0x124/0x6f9 fs/io_uring.c:9647
1 lock held by khungtaskd/27:
#0: ffffffff8b983960 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
1 lock held by in:imklog/6191:
1 lock held by syz-executor.1/6060:
1 lock held by syz-executor.1/6065:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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:210 [inline]
watchdog+0xc1d/0xf50 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327
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: 6060 Comm: syz-executor.1 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unwind_next_frame+0xc/0x1ce0 arch/x86/kernel/unwind_orc.c:418
Code: 25 8a 00 48 8b 04 24 eb bd 48 89 0c 24 e8 2c 25 8a 00 48 8b 0c 24 e9 72 ff ff ff 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 49 89 fe 41 55 41 54 55 53 48 81 ec a0 00 00 00 48 c7 44 24
RSP: 0018:ffffc900060378e0 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: ffffffff8165d6b0 RCX: 0000000000000000
RDX: 1ffff92000c06f4b RSI: ffffffff8938b692 RDI: ffffc900060378f0
RBP: ffffc90006037978 R08: ffffffff8e81a564 R09: 0000000000000001
R10: fffff52000c06f29 R11: 0000000000086089 R12: ffffc900060379a8
R13: 0000000000000000 R14: ffff888039651d00 R15: ffff88815199c900
FS: 00007fb1cb38f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07aa882000 CR3: 0000000011df5000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:591 [inline]
io_add_buffers fs/io_uring.c:4405 [inline]
io_provide_buffers fs/io_uring.c:4439 [inline]
io_issue_sqe+0x2887/0x7010 fs/io_uring.c:6705
__io_queue_sqe fs/io_uring.c:6978 [inline]
io_req_task_submit+0xce/0x450 fs/io_uring.c:2282
tctx_task_work+0x1b3/0x630 fs/io_uring.c:2206
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_signal include/linux/tracehook.h:214 [inline]
handle_signal_work kernel/entry/common.c:146 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb1cde19ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb1cb38f188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000302 RBX: 00007fb1cdf2cf60 RCX: 00007fb1cde19ae9
RDX: 0000000000000000 RSI: 0000000000000302 RDI: 0000000000000004
RBP: 00007fb1cde73f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb1ce460b2f R14: 00007fb1cb38f300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 25 8a 00 48 8b and $0x8b48008a,%eax
5: 04 24 add $0x24,%al
7: eb bd jmp 0xffffffc6
9: 48 89 0c 24 mov %rcx,(%rsp)
d: e8 2c 25 8a 00 callq 0x8a253e
12: 48 8b 0c 24 mov (%rsp),%rcx
16: e9 72 ff ff ff jmpq 0xffffff8d
1b: 0f 1f 00 nopl (%rax)
1e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
25: fc ff df
28: 41 57 push %r15
* 2a: 41 56 push %r14 <-- trapping instruction
2c: 49 89 fe mov %rdi,%r14
2f: 41 55 push %r13
31: 41 54 push %r12
33: 55 push %rbp
34: 53 push %rbx
35: 48 81 ec a0 00 00 00 sub $0xa0,%rsp
3c: 48 rex.W
3d: c7 .byte 0xc7
3e: 44 rex.R
3f: 24 .byte 0x24