INFO: task kworker/u4:5:1414 blocked for more than 143 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:23048 pid: 1414 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 io_uring_try_cancel_iowq fs/io_uring.c:9567 [inline] io_uring_try_cancel_requests+0x7d1/0xc30 fs/io_uring.c:9597 io_ring_exit_work+0x137/0x19a0 fs/io_uring.c:9397 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 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: 1 lock held by khungtaskd/26: #0: ffffffff8b981b20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 3 locks held by kworker/u4:5/1414: #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:634 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268 #1: ffffc90005bbfdb0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272 #2: ffff88803321a0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_iowq fs/io_uring.c:9567 [inline] #2: ffff88803321a0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_requests+0x7d1/0xc30 fs/io_uring.c:9597 1 lock held by in:imklog/6185: #0: ffff8880188660f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 3 locks held by syz-executor.2/9569: 1 lock held by syz-executor.5/23581: 3 locks held by syz-executor.5/23609: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc7-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+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: 9569 Comm: syz-executor.2 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:56 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x52/0x180 mm/kasan/generic.c:189 Code: 39 c7 0f 86 05 01 00 00 49 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 <48> 89 e8 49 8d 5a 01 48 89 da 48 29 ea 48 83 fa 10 7e 63 41 89 eb RSP: 0000:ffffc90000007c28 EFLAGS: 00000086 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff815c3f61 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d6e87d0 RBP: fffffbfff1add0fa R08: 0000000000000000 R09: ffffffff8d6e87d7 R10: fffffbfff1add0fa R11: 0000000000000000 R12: ffffffff90439950 R13: dffffc0000000000 R14: 1ffff92000000fa7 R15: ffffffff898df3c0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f4558b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000054 CR3: 000000007ad49000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] cpu_online include/linux/cpumask.h:895 [inline] trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0xa1/0x720 kernel/locking/lockdep.c:5636 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194 debug_object_activate+0x287/0x3e0 lib/debugobjects.c:689 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x27/0x3e0 kernel/time/hrtimer.c:1084 __run_hrtimer kernel/time/hrtimer.c:1702 [inline] __hrtimer_run_queues+0xb02/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode+0x2e/0x40 kernel/kcov.c:174 Code: 0b 8b 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 64 15 00 00 85 d2 74 0b 8b 86 40 15 00 00 39 f8 <0f> 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 65 8b RSP: 0000:ffffc9000b98fb38 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff88807978d580 RDI: 0000000000000003 RBP: 0000000000000009 R08: 0000000000000004 R09: ffffc9000b98fbc0 R10: ffffffff8148bdc1 R11: 0000000000000000 R12: 0000000000000003 R13: 000000000000000b R14: 00000000f455814c R15: ffffc9000b98fff8 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:284 siginfo_layout kernel/signal.c:3288 [inline] siginfo_layout+0x241/0x290 kernel/signal.c:3274 copy_siginfo_to_external32+0x13b/0xe20 kernel/signal.c:3387 __copy_siginfo_to_user32+0x71/0xe0 kernel/signal.c:3451 ia32_setup_rt_frame+0x6d3/0xad0 arch/x86/ia32/ia32_signal.c:353 setup_rt_frame arch/x86/kernel/signal.c:772 [inline] handle_signal arch/x86/kernel/signal.c:822 [inline] arch_do_signal_or_restart+0xc7e/0x1c40 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:313 exc_page_fault+0xc6/0x180 arch/x86/mm/fault.c:1544 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0023:0xf6f755e6 Code: 0c 50 e8 7d 5a 01 00 83 c4 10 85 c0 0f 84 0a 02 00 00 65 f0 83 2d d8 ff ff ff 01 8b 5c 24 0c e8 40 f7 00 00 8b 4c 24 08 8b 00 <8b> 71 54 89 41 58 85 c0 75 05 83 fe ff 74 19 6b 44 24 20 34 8b 4c RSP: 002b:00000000f4558640 EFLAGS: 00010283 RAX: 000000000000000e RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000f6f755c3 RSI: 0000000000000005 RDI: 0000000000000000 RBP: 00000000f70bafa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 39 c7 cmp %eax,%edi 2: 0f 86 05 01 00 00 jbe 0x10d 8: 49 83 e9 01 sub $0x1,%r9 c: 48 89 fd mov %rdi,%rbp f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 4d 89 ca mov %r9,%r10 1c: 48 c1 ed 03 shr $0x3,%rbp 20: 49 c1 ea 03 shr $0x3,%r10 24: 48 01 c5 add %rax,%rbp 27: 49 01 c2 add %rax,%r10 * 2a: 48 89 e8 mov %rbp,%rax <-- trapping instruction 2d: 49 8d 5a 01 lea 0x1(%r10),%rbx 31: 48 89 da mov %rbx,%rdx 34: 48 29 ea sub %rbp,%rdx 37: 48 83 fa 10 cmp $0x10,%rdx 3b: 7e 63 jle 0xa0 3d: 41 89 eb mov %ebp,%r11d