INFO: task syz-executor.1:10953 blocked for more than 143 seconds. Not tainted 5.13.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26128 pid:10953 ppid: 8448 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0x916/0x23e0 kernel/sched/core.c:5147 schedule+0xcf/0x270 kernel/sched/core.c:5226 perf_event_free_task+0x519/0x6c0 kernel/events/core.c:12765 copy_process+0x4a7b/0x7120 kernel/fork.c:2379 kernel_clone+0xe7/0xab0 kernel/fork.c:2503 __do_sys_clone+0xc8/0x110 kernel/fork.c:2620 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f1018e20188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000004bfcb9 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffec6965ccf R14: 00007f1018e20300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1632: #0: ffffffff8bf767e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 2 locks held by in:imklog/8350: #0: ffff88801823fdb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 #1: ffff8880b9d35358 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1334 [inline] #1: ffff8880b9d35358 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x21c/0x23e0 kernel/sched/core.c:5061 2 locks held by kworker/0:9/9793: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1632 Comm: khungtaskd Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4846 Comm: systemd-journal Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_next_frame+0x1c1/0x1ce0 arch/x86/kernel/unwind_orc.c:443 Code: ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 cb 0a 00 00 4c 89 e1 41 0f b6 46 35 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 <0f> 85 39 14 00 00 4d 8b 7e 48 3c 01 49 c7 c0 e0 24 df 8b 49 83 df RSP: 0018:ffffc90001837a58 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff92000306f53 RCX: 1ffff92000306f6f RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88801e0a7430 RBP: 0000000000000001 R08: ffffffff8e45ee44 R09: 0000000000000001 R10: fffff52000306f71 R11: 0000000000084087 R12: ffffc90001837b78 R13: ffffc90001837b65 R14: ffffc90001837b30 R15: ffff8880286632c0 FS: 00007fb24073d8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb23db71000 CR3: 000000001e2cd000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3038 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x272/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb23fccc840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffc3ce7e7d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffc3ce7eae0 RCX: 00007fb23fccc840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055a6242360b0 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055a624229060 R14: 00007ffc3ce7eaa0 R15: 000055a624235ed0