INFO: task syz-executor.2:13964 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:28120 pid:13964 ppid: 6698 flags:0x20024004 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_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6f14547 RSP: 002b:00000000f450e67c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: 00000000000000f0 RBX: 00000000f7070fa8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7070fac RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b983960 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6176: #0: ffff888072c5a370 (&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: 9737 Comm: kworker/u4:9 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:lookup_object lib/debugobjects.c:198 [inline] RIP: 0010:__debug_object_init+0xef/0xd10 lib/debugobjects.c:571 Code: 48 8b ab 00 57 41 90 31 c0 48 85 ed 74 46 48 ba 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c0 01 48 89 f9 48 c1 e9 03 80 3c 11 00 <0f> 85 df 07 00 00 4c 3b 65 18 0f 84 69 03 00 00 48 89 e9 48 c1 e9 RSP: 0018:ffffc90017117a58 EFLAGS: 00000046 RAX: 0000000000000004 RBX: 00000000000cda58 RCX: 1ffff1100397a3ca RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff88801cbd1e50 RBP: ffff88801cbd1e38 R08: 0000000000000202 R09: 0000000000000003 R10: fffff52002e22f39 R11: 0000000000000000 R12: ffffc90017117b88 R13: 1ffff92002e22f5a R14: ffffffff904e3160 R15: ffffffff904e3158 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff4bc240000 CR3: 000000000b68e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: init_timer_on_stack_key kernel/time/timer.c:752 [inline] schedule_timeout+0xf2/0x2a0 kernel/time/timer.c:1879 toggle_allocation_gate mm/kfence/core.c:633 [inline] toggle_allocation_gate+0x305/0x390 mm/kfence/core.c:618 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 ---------------- Code disassembly (best guess): 0: 48 8b ab 00 57 41 90 mov -0x6fbea900(%rbx),%rbp 7: 31 c0 xor %eax,%eax 9: 48 85 ed test %rbp,%rbp c: 74 46 je 0x54 e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 15: fc ff df 18: 48 8d 7d 18 lea 0x18(%rbp),%rdi 1c: 83 c0 01 add $0x1,%eax 1f: 48 89 f9 mov %rdi,%rcx 22: 48 c1 e9 03 shr $0x3,%rcx 26: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) * 2a: 0f 85 df 07 00 00 jne 0x80f <-- trapping instruction 30: 4c 3b 65 18 cmp 0x18(%rbp),%r12 34: 0f 84 69 03 00 00 je 0x3a3 3a: 48 89 e9 mov %rbp,%rcx 3d: 48 rex.W 3e: c1 .byte 0xc1 3f: e9 .byte 0xe9