NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.4:12286 blocked for more than 140 seconds. Not tainted 4.19.130-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D26120 12286 6878 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 perf_event_free_task+0x4cf/0x660 kernel/events/core.c:11348 copy_process.part.0+0x3717/0x7f40 kernel/fork.c:2125 copy_process kernel/fork.c:1694 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2207 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45cb29 Code: 48 8b 6c 24 20 48 83 c4 28 c3 48 8b 80 c8 00 00 00 48 39 c8 74 e5 48 8b 44 24 30 48 89 04 24 48 8b 44 24 38 48 89 44 24 08 0f 44 24 48 88 44 24 10 0f b6 44 24 49 88 44 24 11 0f b6 44 24 4a RSP: 002b:00007f3dafd05c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00000000004db560 RCX: 000000000045cb29 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000080000100 RBP: 000000000078bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000007c R14: 00000000004c34ba R15: 00007f3dafd066d4 Showing all locks held in the system: 1 lock held by khungtaskd/1072: #0: 000000009aa59479 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6138: #0: 00000000a7dea2f3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by kworker/1:0/7003: #0: 00000000c73d374f (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1823 [inline] #0: 00000000c73d374f (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3453 #1: 00000000ca4c97b2 ((work_completion)(&(&ipvs->defense_work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 #2: 000000002c8d1c2c (&base->lock){-.-.}, at: lock_timer_base+0x55/0x1b0 kernel/time/timer.c:938 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1072 Comm: khungtaskd Not tainted 4.19.130-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26084 Comm: kworker/u4:4 Not tainted 4.19.130-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline] RIP: 0010:lock_release+0xd1/0x8b0 kernel/locking/lockdep.c:3922 Code: 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c3 06 00 00 48 83 3d d6 d3 80 07 00 0f 84 1b 05 00 00 9c <58> 0f 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 04 24 48 c7 RSP: 0018:ffff88809f3efb18 EFLAGS: 00000082 RAX: 1ffffffff11a4b68 RBX: ffff888062916080 RCX: ffffffff8152547b RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888062916904 RBP: ffffffff891c9f58 R08: 0000000000000001 R09: fffffbfff12393e8 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11013e7df67 R13: ffffffff83607d5d R14: ffff88809f7054d0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07aab90370 CR3: 000000008891c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: