INFO: task syz-executor.2:25483 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26800 pid:25483 ppid: 6735 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 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+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1162 [inline] io_wq_put_and_exit+0x40c/0xc70 fs/io-wq.c:1197 io_uring_clean_tctx fs/io_uring.c:9609 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9689 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 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:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f0c4a8c6188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000082 RBX: 000000000056c0f0 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000002a6e RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 000000000000c000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 0000000000a9fb1f R14: 00007f0c4a8c6300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97fda0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6384: #0: ffff888025aeb9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.14.0-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+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: 2957 Comm: systemd-journal Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:277 [inline] RIP: 0010:__d_lookup_rcu+0x19c/0x6c0 fs/dcache.c:2319 Code: 38 00 0f 85 54 04 00 00 4d 8b 6d 00 4d 85 ed 0f 84 ea 03 00 00 e8 74 b9 a6 ff 49 8d 5d c8 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 74 08 3c 03 0f 8e 40 04 00 00 45 8b 65 c8 49 8d 6d 10 48 89 RSP: 0018:ffffc90002a2f950 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffff8880183ff030 RCX: 0000000000000000 RDX: ffff88807b9d1c80 RSI: ffffffff81cf53cc RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: ffff8880b9c32a0b R10: ffffffff81cf536b R11: 0000000000000000 R12: 000000000000000c R13: ffff8880183ff068 R14: ffff8881458cd028 R15: dffffc0000000000 FS: 00007fdc6578f8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdc62c70020 CR3: 000000001a9c0000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lookup_fast+0xe1/0x6d0 fs/namei.c:1580 walk_component+0xcf/0x6a0 fs/namei.c:1966 link_path_walk.part.0+0x757/0xd00 fs/namei.c:2297 link_path_walk fs/namei.c:2221 [inline] path_lookupat+0xc8/0x860 fs/namei.c:2448 __filename_lookup+0x1c6/0x590 fs/namei.c:2478 filename_lookup fs/namei.c:2494 [inline] user_path_at_empty+0x42/0x90 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x127/0x850 fs/open.c:421 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: 0033:0x7fdc64a4a9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff11a99dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff11a9ccf0 RCX: 00007fdc64a4a9c7 RDX: 00007fdc654bba00 RSI: 0000000000000000 RDI: 0000557a5138c9a3 RBP: 00007fff11a99e10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fff11a9ccf0 R15: 00007fff11a9a300 ---------------- Code disassembly (best guess): 0: 38 00 cmp %al,(%rax) 2: 0f 85 54 04 00 00 jne 0x45c 8: 4d 8b 6d 00 mov 0x0(%r13),%r13 c: 4d 85 ed test %r13,%r13 f: 0f 84 ea 03 00 00 je 0x3ff 15: e8 74 b9 a6 ff callq 0xffa6b98e 1a: 49 8d 5d c8 lea -0x38(%r13),%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 74 08 je 0x36 2e: 3c 03 cmp $0x3,%al 30: 0f 8e 40 04 00 00 jle 0x476 36: 45 8b 65 c8 mov -0x38(%r13),%r12d 3a: 49 8d 6d 10 lea 0x10(%r13),%rbp 3e: 48 rex.W 3f: 89 .byte 0x89