INFO: task kworker/u4:6:7299 blocked for more than 143 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:25320 pid: 7299 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: 1 lock held by khungtaskd/27: #0: ffffffff8b9838e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6174: 3 locks held by kworker/u4:6/7299: #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: ffffc90004fafdb0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff88807bccf0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_iowq fs/io_uring.c:9617 [inline] #2: ffff88807bccf0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_requests+0x124/0x6f9 fs/io_uring.c:9647 2 locks held by kworker/u4:9/18878: 1 lock held by syz-executor.5/26033: ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26033 Comm: syz-executor.5 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+0xcf1/0x1ce0 arch/x86/kernel/unwind_orc.c:539 Code: 28 84 c0 48 8b 4c 24 30 0f 84 33 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 4c 8b 64 24 60 48 c1 ea 03 80 3c 02 00 <0f> 85 98 0e 00 00 48 8b 14 24 4d 89 66 38 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc9000b51f818 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff920016a3f0b RCX: ffffffff8e8159b5 RDX: 1ffff920016a3f25 RSI: ffffc9000b51ff38 RDI: ffffc9000b51ff38 RBP: 0000000000000001 R08: ffffffff8e8159b0 R09: 0000000000000001 R10: fffff520016a3f29 R11: 0000000000086089 R12: ffffc9000b51ff40 R13: ffffc9000b51f925 R14: ffffc9000b51f8f0 R15: ffffffff8e8159b4 FS: 00007f4d3f492700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb99de6000 CR3: 000000003bace000 CR4: 00000000003506e0 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: 0033:0x7f4d41f1cae9 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:00007f4d3f492188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000002675 RBX: 00007f4d4202ff60 RCX: 00007f4d41f1cae9 RDX: 0000000000000000 RSI: 0000000000002675 RDI: 0000000000000003 RBP: 00007f4d41f76f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4d42563b2f R14: 00007f4d3f492300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 84 c0 test %al,%al 2: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx 7: 0f 84 33 07 00 00 je 0x740 d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 48 8b 54 24 08 mov 0x8(%rsp),%rdx 1c: 4c 8b 64 24 60 mov 0x60(%rsp),%r12 21: 48 c1 ea 03 shr $0x3,%rdx 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 29: 0f 85 98 0e 00 00 jne 0xec7 <-- trapping instruction 2f: 48 8b 14 24 mov (%rsp),%rdx 33: 4d 89 66 38 mov %r12,0x38(%r14) 37: 48 rex.W 38: b8 00 00 00 00 mov $0x0,%eax 3d: 00 fc add %bh,%ah