INFO: task syz-executor.2:20810 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:syz-executor.2 state:D stack:27944 pid:20810 ppid: 6505 flags:0x00024004 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 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9850 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x263/0x2a20 kernel/exit.c:781 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47d/0x21d0 kernel/signal.c:2855 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: 0033:0x7fc010a8aae9 RSP: 002b:00007fc00e000218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fc010b9df68 RCX: 00007fc010a8aae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc010b9df68 RBP: 00007fc010b9df60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc010b9df6c R13: 00007fff61ebcf8f R14: 00007fc00e000300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97ffe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6166: #0: ffff88802390dd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 ============================================= 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: 6167 Comm: rs:main Q:Reg Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__pvclock_read_cycles arch/x86/include/asm/pvclock.h:86 [inline] RIP: 0010:pvclock_clocksource_read+0x144/0x530 arch/x86/kernel/pvclock.c:76 Code: 24 18 48 2b 43 08 0f b6 17 83 e1 07 38 ca 7f 08 84 d2 0f 85 00 03 00 00 4c 89 c6 48 8b 3c 24 4d 89 c3 48 c1 ee 03 41 83 e3 07 <0f> be 53 1c 0f b6 34 2e 48 c1 ef 03 0f b6 3c 2f 89 d1 44 38 de 41 RSP: 0018:ffffc9000c547e00 EFLAGS: 00000046 RAX: 000002d50c76a1e2 RBX: ffffffff8ef0d040 RCX: 0000000000000004 RDX: 0000000000000000 RSI: 1ffffffff1de1a0b RDI: ffffffff8ef0d05b RBP: dffffc0000000000 R08: ffffffff8ef0d058 R09: ffffffff8ef0d04f R10: ffffffff8ef0d057 R11: 0000000000000000 R12: ffffffff8ef0d043 R13: fffffbfff1de1a09 R14: ffffffff8ef0d05d R15: ffffffff8ef0d050 FS: 00007f2d90dff700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa2d719c000 CR3: 000000006c4da000 CR4: 00000000003506e0 Call Trace: kvm_clock_read arch/x86/kernel/kvmclock.c:79 [inline] kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:91 vtime_delta kernel/sched/cputime.c:637 [inline] get_vtime_delta+0x1a/0x420 kernel/sched/cputime.c:646 vtime_user_exit+0xb4/0x210 kernel/sched/cputime.c:720 __context_tracking_exit+0xb8/0xe0 kernel/context_tracking.c:160 user_exit_irqoff include/linux/context_tracking.h:47 [inline] __enter_from_user_mode kernel/entry/common.c:22 [inline] syscall_enter_from_user_mode+0x4c/0x70 kernel/entry/common.c:104 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2d938431cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f2d90dfe590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2d88003990 RCX: 00007f2d938431cd RDX: 00000000000004c4 RSI: 00007f2d88003990 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f2d880036f0 R13: 00007f2d90dfe5b0 R14: 000056177ed41360 R15: 00000000000004c4 ---------------- Code disassembly (best guess): 0: 24 18 and $0x18,%al 2: 48 2b 43 08 sub 0x8(%rbx),%rax 6: 0f b6 17 movzbl (%rdi),%edx 9: 83 e1 07 and $0x7,%ecx c: 38 ca cmp %cl,%dl e: 7f 08 jg 0x18 10: 84 d2 test %dl,%dl 12: 0f 85 00 03 00 00 jne 0x318 18: 4c 89 c6 mov %r8,%rsi 1b: 48 8b 3c 24 mov (%rsp),%rdi 1f: 4d 89 c3 mov %r8,%r11 22: 48 c1 ee 03 shr $0x3,%rsi 26: 41 83 e3 07 and $0x7,%r11d * 2a: 0f be 53 1c movsbl 0x1c(%rbx),%edx <-- trapping instruction 2e: 0f b6 34 2e movzbl (%rsi,%rbp,1),%esi 32: 48 c1 ef 03 shr $0x3,%rdi 36: 0f b6 3c 2f movzbl (%rdi,%rbp,1),%edi 3a: 89 d1 mov %edx,%ecx 3c: 44 38 de cmp %r11b,%sil 3f: 41 rex.B