INFO: task kworker/u4:1:10 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack:24912 pid: 10 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __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:9613 [inline] io_uring_try_cancel_requests+0x124/0x6f9 fs/io_uring.c:9643 io_ring_exit_work+0xff/0xbe8 fs/io_uring.c:9441 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 INFO: task syz-executor.4:19877 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28152 pid:19877 ppid: 6934 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:9746 io_uring_clean_tctx fs/io_uring.c:9762 [inline] io_uring_cancel_generic+0x5d5/0x690 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+0x47d/0x2220 kernel/signal.c:2830 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: 0033:0x7effade9cae9 RSP: 002b:00007effab3f1218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007effadfb0028 RCX: 00007effade9cae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007effadfb0028 RBP: 00007effadfb0020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007effadfb002c R13: 00007effae4e3b2f R14: 00007effab3f1300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:1/10: #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: ffffc90000cf7db0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff88802fae40a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_iowq fs/io_uring.c:9613 [inline] #2: ffff88802fae40a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_requests+0x124/0x6f9 fs/io_uring.c:9643 1 lock held by khungtaskd/27: #0: ffffffff8bb83b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6222: #0: ffff88801ca57270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 3 locks held by syz-executor.4/19872: 1 lock held by syz-executor.4/19877: #0: ffff88802c1060a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:9746 1 lock held by syz-executor.4/19903: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-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: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: 2964 Comm: systemd-journal Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:200 Code: 00 00 e9 66 13 63 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 e9 d7 8a 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e RSP: 0018:ffffc9000205fcd0 EFLAGS: 00000293 RAX: 0000000080000000 RBX: 000000000000000a RCX: 0000000080000000 RDX: 0000000000000000 RSI: ffffffff815e85ef RDI: 0000000000000003 RBP: 0000000000000072 R08: 0000000000000021 R09: 0000000000000052 R10: ffffffff815e86a7 R11: 000000000000005e R12: ffff88807a740122 R13: 0000000000000021 R14: ffff88807a742150 R15: 0000000000000052 FS: 00007f4fbc21f8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4fb9a1b000 CR3: 000000001df5f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: msg_add_ext_text+0x4f/0x1d0 kernel/printk/printk.c:583 msg_print_ext_body+0x33/0x90 kernel/printk/printk.c:615 devkmsg_read+0x45c/0x730 kernel/printk/printk.c:750 vfs_read+0x1b5/0x600 fs/read_write.c:479 ksys_read+0x12d/0x250 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4fbb7ae210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffdf5e449a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffdf5e47420 RCX: 00007f4fbb7ae210 RDX: 0000000000002000 RSI: 00007ffdf5e45220 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00007ffdf5fef080 R10: 00007ffdf5fef0f0 R11: 0000000000000246 R12: 00007ffdf5e45220 R13: 00007ffdf5e47378 R14: 0000560065e51958 R15: 0005d132fcba200b ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: e9 66 13 63 02 jmpq 0x263136d 7: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) d: 48 8b be b0 01 00 00 mov 0x1b0(%rsi),%rdi 14: e8 b4 ff ff ff callq 0xffffffcd 19: 31 c0 xor %eax,%eax 1b: c3 retq 1c: 90 nop 1d: 65 8b 05 e9 d7 8a 7e mov %gs:0x7e8ad7e9(%rip),%eax # 0x7e8ad80d 24: 89 c1 mov %eax,%ecx 26: 48 8b 34 24 mov (%rsp),%rsi * 2a: 81 e1 00 01 00 00 and $0x100,%ecx <-- trapping instruction 30: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx 37: 02 00 39: a9 00 01 ff 00 test $0xff0100,%eax 3e: 74 0e je 0x4e