INFO: task syz-executor.2:11476 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28008 pid:11476 ppid: 6745 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9846 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/0x2220 kernel/signal.c:2830 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: 0033:0x7f9ff1cdfae9 RSP: 002b:00007f9fef255218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f9ff1df2f68 RCX: 00007f9ff1cdfae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9ff1df2f68 RBP: 00007f9ff1df2f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ff1df2f6c R13: 00007f9ff2326b2f R14: 00007f9fef255300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6447: #0: ffff888077552af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 5 locks held by kworker/1:5/7769: #0: ffff8880b9d39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 #1: ffff8880b9d279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880 #2: ffff8880b9d28298 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946 #3: ffff8880b9d28298 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946 #4: ffffffff90719450 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:661 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-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+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: 14 Comm: rcu_preempt Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:detach_timer kernel/time/timer.c:830 [inline] RIP: 0010:detach_if_pending+0x1b0/0x470 kernel/time/timer.c:846 Code: 45 84 e4 74 0d e8 50 21 11 00 48 c7 43 08 00 00 00 00 e8 43 21 11 00 41 bc 01 00 00 00 48 b8 22 01 00 00 00 00 ad de 48 89 03 2b 21 11 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e c3 e8 1a 21 11 00 RSP: 0018:ffffc90000d37bb0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffc90000d37cc0 RCX: 0000000000000000 RDX: 1ffff920001a6f99 RSI: ffffffff8166c516 RDI: ffffc90000d37cc0 RBP: ffff8880b9d28280 R08: 000000000a400001 R09: 0000000000000003 R10: ffffffff8166513e R11: 0000000000000001 R12: 0000000000000000 R13: ffffc90000d37cc8 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9f1dbe1000 CR3: 000000001c2ec000 CR4: 00000000003526e0 Call Trace: try_to_del_timer_sync+0xaa/0x110 kernel/time/timer.c:1234 del_timer_sync+0x138/0x1b0 kernel/time/timer.c:1382 schedule_timeout+0x152/0x2a0 kernel/time/timer.c:1882 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 45 84 e4 test %r12b,%r12b 3: 74 0d je 0x12 5: e8 50 21 11 00 callq 0x11215a a: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) 11: 00 12: e8 43 21 11 00 callq 0x11215a 17: 41 bc 01 00 00 00 mov $0x1,%r12d 1d: 48 b8 22 01 00 00 00 movabs $0xdead000000000122,%rax 24: 00 ad de 27: 48 89 03 mov %rax,(%rbx) * 2a: e8 2b 21 11 00 callq 0x11215a <-- trapping instruction 2f: 44 89 e0 mov %r12d,%eax 32: 5b pop %rbx 33: 5d pop %rbp 34: 41 5c pop %r12 36: 41 5d pop %r13 38: 41 5e pop %r14 3a: c3 retq 3b: e8 1a 21 11 00 callq 0x11215a