INFO: task syz.0.3195:18057 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3195      state:D stack:28072 pid:18057 tgid:18054 ppid:5849   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 sync_bdevs+0x1ac/0x340
 ksys_sync+0xb9/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f02f518ebe9
RSP: 002b:00007f02f33f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f02f53b6180 RCX: 00007f02f518ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f02f53b6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f02f53b6218 R14: 00007f02f53b6180 R15: 00007ffce1c921d8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 17834 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unwind_next_frame+0x12e3/0x2390
Code: 18 48 8b 10 48 c7 c7 40 3c 88 8b 89 de e8 15 cd b4 ff e9 43 06 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 <48> c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef
RSP: 0018:ffffc900001e0918 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8fb6899c RCX: 0000000000000000
RDX: ffffffff8fb6899c RSI: ffffffff903216a0 RDI: ffffffff8be33620
RBP: ffffffff8fb6899c R08: 0000000000000004 R09: 0000000000000000
R10: ffffc900001e0a38 R11: ffffffff81ac3810 R12: ffffffff81665537
R13: ffffffff8fb6899c R14: ffffc900001e09e8 R15: ffffffff8fb689a0
FS:  00007f19bf9a1c80(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561ed587faa8 CR3: 000000010a728000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 __send_signal_locked+0x22a/0xeb0
 group_send_sig_info+0x1fd/0x260
 do_bpf_send_signal+0xa9/0x1c0
 irq_work_single+0xe1/0x240
 irq_work_run+0x155/0x2f0
 __sysvec_irq_work+0xa8/0x3d0
 sysvec_irq_work+0x9e/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 92 86 8e 03 66
RSP: 0018:ffffc90004db74a8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: ffffc90004db7580 R08: ffffc90004db7507 R09: 1ffff920009b6ea0
R10: dffffc0000000000 R11: fffff520009b6ea1 R12: ffff888136631401
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881366314b0
 arch_irq_work_raise+0x6d/0x80
 __irq_work_queue_local+0x1d7/0x550
 irq_work_queue+0x99/0x140
 bpf_send_signal_common+0x3b4/0x540
 bpf_send_signal+0x1d/0x30
 bpf_prog_631417f49dd64198+0x25/0x4c
 bpf_trace_run2+0x284/0x4b0
 __bpf_trace_contention_end+0xdc/0x130
 trace_contention_end+0xf4/0x120
 __mutex_lock+0x32b/0x1350
 ep_try_send_events+0x197/0xf40
 do_epoll_wait+0x53f/0xf40
 __x64_sys_epoll_wait+0x1be/0x210
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f19bf523457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc2ec2ce88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f19bf523457
RDX: 0000000000000004 RSI: 00007ffc2ec2cec8 RDI: 0000000000000004
RBP: 00007ffc2ec2ced4 R08: 0000000000000007 R09: 4fa3c6e6a59e4ae6
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000561ed589cfe0
R13: 00007ffc2ec2cec8 R14: 0000000000000001 R15: 0000561ed586e910
 </TASK>
IPVS: sh: UDP 224.0.0.2:0 - no destination available
