INFO: task syz-executor.1:10488 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.1 state:D stack:27256 pid:10488 ppid: 6538 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+0x60c/0x2b40 kernel/exit.c:787 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x21d0 kernel/signal.c:2820 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: 0033:0x7f5a59bb7ae7 RSP: 002b:00007f5a5712d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 00000000000000ca RBX: 00007f5a59ccaf68 RCX: 00007f5a59bb7ae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5a59ccaf68 RBP: 00007f5a59ccaf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5a59ccaf6c R13: 00007f5a5a1feb2f R14: 00007f5a5712d300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b983920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6173: #0: ffff8880724399f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by agetty/6401: #0: ffff88807bcf5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90001f682e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 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: 2936 Comm: systemd-journal Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1022/0x54a0 kernel/locking/lockdep.c:4985 Code: 10 be 08 00 00 00 48 8d 43 3f 48 85 db 48 0f 49 c3 48 c1 f8 06 48 8d 3c c5 00 ba d3 8f e8 86 b8 61 00 48 0f a3 1d de 2f 77 0e <0f> 82 c7 f8 ff ff e8 d3 d4 79 02 85 c0 0f 84 f1 fd ff ff 48 c7 c0 RSP: 0018:ffffc900029e7cc8 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 00000000000000a0 RCX: ffffffff815c8a1a RDX: fffffbfff1fa7743 RSI: 0000000000000008 RDI: ffffffff8fd3ba10 RBP: ffff88807aa58a82 R08: 0000000000000000 R09: ffffffff8fd3ba17 R10: fffffbfff1fa7742 R11: 0000000000000000 R12: ffff88807aa58a60 R13: ffff88807aa58000 R14: 0000000000040000 R15: 0000000000000000 FS: 00007fc4835f78c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc480a40000 CR3: 0000000019bc6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 do_write_seqcount_begin_nested include/linux/seqlock.h:520 [inline] do_write_seqcount_begin include/linux/seqlock.h:545 [inline] vtime_user_enter+0x9f/0x170 kernel/sched/cputime.c:709 __context_tracking_enter+0xef/0x100 kernel/context_tracking.c:82 user_enter_irqoff include/linux/context_tracking.h:41 [inline] __exit_to_user_mode kernel/entry/common.c:130 [inline] syscall_exit_to_user_mode+0x48/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc48288ff17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffda3793998 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: 0000000000000b78 RBX: 00005555ee34e1e0 RCX: 00007fc48288ff17 RDX: 0000000000000000 RSI: 00000000177cd083 RDI: 00005555ee34e1e0 RBP: 0000000000000b78 R08: 000000000000018a R09: 00007ffda37f9080 R10: 00007ffda37f90f0 R11: 0000000000000202 R12: ffffffffffffffff R13: 00007ffda3793a48 R14: 00005555edabe958 R15: 0005cff0f0157edc ---------------- Code disassembly (best guess): 0: 10 be 08 00 00 00 adc %bh,0x8(%rsi) 6: 48 8d 43 3f lea 0x3f(%rbx),%rax a: 48 85 db test %rbx,%rbx d: 48 0f 49 c3 cmovns %rbx,%rax 11: 48 c1 f8 06 sar $0x6,%rax 15: 48 8d 3c c5 00 ba d3 lea -0x702c4600(,%rax,8),%rdi 1c: 8f 1d: e8 86 b8 61 00 callq 0x61b8a8 22: 48 0f a3 1d de 2f 77 bt %rbx,0xe772fde(%rip) # 0xe773008 29: 0e * 2a: 0f 82 c7 f8 ff ff jb 0xfffff8f7 <-- trapping instruction 30: e8 d3 d4 79 02 callq 0x279d508 35: 85 c0 test %eax,%eax 37: 0f 84 f1 fd ff ff je 0xfffffe2e 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c0 .byte 0xc0