INFO: task syz-executor.5:28020 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28352 pid:28020 ppid: 6886 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4987 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6268 schedule+0xd2/0x260 kernel/sched/core.c:6341 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x174/0x270 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1217 [inline] io_wq_put_and_exit+0x33a/0xb70 fs/io-wq.c:1252 io_uring_clean_tctx fs/io_uring.c:9770 [inline] io_uring_cancel_generic+0x61d/0x690 fs/io_uring.c:9851 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x60c/0x2b40 kernel/exit.c:787 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x34c/0x28b0 kernel/signal.c:2837 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 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 __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: 0033:0x7f920e048ae9 RSP: 002b:00007f920b59d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f920e15c028 RCX: 00007f920e048ae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f920e15c028 RBP: 00007f920e15c020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f920e15c02c R13: 00007ffd877bd51f R14: 00007f920b59d300 R15: 0000000000022000 INFO: task iou-wrk-28020:28024 can't die for more than 144 seconds. task:iou-wrk-28020 state:R running task stack:27016 pid:28024 ppid: 6886 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4987 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6268 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6219: #0: ffff888018fe6d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by systemd-udevd/12425: 3 locks held by systemd-udevd/12620: 3 locks held by iou-wrk-28020/28024: 2 locks held by grep/32342: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-next-20211118-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:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+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: 2960 Comm: systemd-journal Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline] RIP: 0010:kasan_check_range+0x9/0x180 mm/kasan/generic.c:189 Code: 47 08 48 c7 c6 30 89 38 8b 48 8d 50 ff a8 01 48 0f 45 fa e8 e9 6f ec ff 0f 0b 0f 1f 80 00 00 00 00 48 85 f6 0f 84 3c 01 00 00 <49> 89 f9 41 54 44 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 RSP: 0018:ffffc90001aafb98 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff815cb6e7 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d90e7d0 RBP: 1ffff92000355f76 R08: 0000000000000202 R09: 0000000000000003 R10: 1ffff1100f30d663 R11: 0000000000000000 R12: ffffffff906dce50 R13: 1ffff92000355f9f R14: ffffffff906dce38 R15: ffffffff906dce30 FS: 00007f2ddf1c78c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ddb897000 CR3: 000000001cd11000 CR4: 00000000003506e0 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:379 [inline] cpu_online include/linux/cpumask.h:921 [inline] trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x457/0x720 kernel/locking/lockdep.c:5648 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194 __debug_object_init+0x409/0xd10 lib/debugobjects.c:605 debug_object_init lib/debugobjects.c:620 [inline] debug_object_activate+0x32c/0x3e0 lib/debugobjects.c:706 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2969 [inline] call_rcu+0x2c/0x740 kernel/rcu/tree.c:3065 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/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: 0033:0x7f2dde756840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffc2d9261d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffc2d9264e0 RCX: 00007f2dde756840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000557b419f7230 RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000557b419ea040 R14: 00007ffc2d9264a0 R15: 0000557b419f7830 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 48 c7 c6 30 89 38 8b mov $0xffffffff8b388930,%rsi 7: 48 8d 50 ff lea -0x1(%rax),%rdx b: a8 01 test $0x1,%al d: 48 0f 45 fa cmovne %rdx,%rdi 11: e8 e9 6f ec ff callq 0xffec6fff 16: 0f 0b ud2 18: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1f: 48 85 f6 test %rsi,%rsi 22: 0f 84 3c 01 00 00 je 0x164 * 28: 49 89 f9 mov %rdi,%r9 <-- trapping instruction 2b: 41 54 push %r12 2d: 44 0f b6 c2 movzbl %dl,%r8d 31: 49 01 f1 add %rsi,%r9 34: 55 push %rbp 35: 53 push %rbx 36: 0f 82 18 01 00 00 jb 0x154 3c: 48 rex.W 3d: b8 .byte 0xb8