INFO: task syz-executor.0:9160 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27680 pid: 9160 ppid: 6561 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:1181 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1216 io_uring_clean_tctx fs/io_uring.c:9614 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9694 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: 0033:0x7f2f2abc1739 RSP: 002b:00007f2f280f6188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 000000000000007d RBX: 00007f2f2acc60f0 RCX: 00007f2f2abc1739 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000005 RBP: 00007f2f2ac1bcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2f2acc60f0 R13: 00007ffeef95696f R14: 00007f2f280f6300 R15: 0000000000022000 Showing all locks held in the system: 6 locks held by kworker/u4:1/10: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6458: #0: ffff8880787a0df0 (&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-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: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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2948 Comm: systemd-journal Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:deref_stack_reg+0xe/0x150 arch/x86/kernel/unwind_orc.c:351 Code: 88 00 48 8b 14 24 e9 48 ff ff ff 48 89 0c 24 e8 d8 6e 88 00 48 8b 0c 24 eb 9d 66 90 48 b8 00 00 00 00 00 fc ff df 41 55 41 54 <49> 89 fc 55 48 89 f5 53 48 89 d3 48 89 fa 48 c1 ea 03 48 83 ec 08 RSP: 0018:ffffc90002077940 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff9200040ef33 RCX: ffffffff8e7f6cf3 RDX: ffffc90002077a78 RSI: ffffc90002077f50 RDI: ffffc90002077a30 RBP: 0000000000000001 R08: ffffffff8e7f6cee R09: 0000000000000001 R10: fffff5200040ef51 R11: 0000000000086089 R12: ffffc90002077a78 R13: ffffc90002077a65 R14: ffffc90002077a30 R15: ffffffff8e7f6cf2 FS: 00007fadf53278c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fadf2755010 CR3: 0000000027467000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xcc3/0x1ce0 arch/x86/kernel/unwind_orc.c:534 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x80/0xa0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc mm/slab.c:3323 [inline] kmem_cache_alloc+0x25f/0x540 mm/slab.c:3507 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:319 user_path_at_empty+0x2b/0x60 fs/namei.c:2800 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: 0033:0x7fadf45e29c7 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:00007ffedfc73c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffedfc76b20 RCX: 00007fadf45e29c7 RDX: 00007fadf5053a00 RSI: 0000000000000000 RDI: 00005560fac1e9a3 RBP: 00007ffedfc73c40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffedfc76b20 R15: 00007ffedfc74130 ---------------- Code disassembly (best guess): 0: 88 00 mov %al,(%rax) 2: 48 8b 14 24 mov (%rsp),%rdx 6: e9 48 ff ff ff jmpq 0xffffff53 b: 48 89 0c 24 mov %rcx,(%rsp) f: e8 d8 6e 88 00 callq 0x886eec 14: 48 8b 0c 24 mov (%rsp),%rcx 18: eb 9d jmp 0xffffffb7 1a: 66 90 xchg %ax,%ax 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 41 55 push %r13 28: 41 54 push %r12 * 2a: 49 89 fc mov %rdi,%r12 <-- trapping instruction 2d: 55 push %rbp 2e: 48 89 f5 mov %rsi,%rbp 31: 53 push %rbx 32: 48 89 d3 mov %rdx,%rbx 35: 48 89 fa mov %rdi,%rdx 38: 48 c1 ea 03 shr $0x3,%rdx 3c: 48 83 ec 08 sub $0x8,%rsp