INFO: task syz.2.1705:11938 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1705      state:D stack:22992 pid:11938 tgid:11936 ppid:5849   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 __ib_unregister_device+0x284/0x3f0
 ib_unregister_device_and_put+0xb8/0xf0
 nldev_dellink+0x2d1/0x320
 rdma_nl_rcv+0x6ae/0x980
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f633e78ebe9
RSP: 002b:00007f633f661038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f633e9b5fa0 RCX: 00007f633e78ebe9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007f633e811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f633e9b6038 R14: 00007f633e9b5fa0 R15: 00007ffd6eebafe8
 </TASK>
INFO: task syz.2.1705:11939 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1705      state:D stack:23856 pid:11939 tgid:11936 ppid:5849   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 disable_device+0x1c6/0x320
 __ib_unregister_device+0x2cb/0x3f0
 ib_unregister_device_and_put+0xb8/0xf0
 nldev_dellink+0x2d1/0x320
 rdma_nl_rcv+0x6ae/0x980
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f633e78ebe9
RSP: 002b:00007f633f640038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f633e9b6090 RCX: 00007f633e78ebe9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007f633e811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f633e9b6128 R14: 00007f633e9b6090 R15: 00007ffd6eebafe8
 </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:
net_ratelimit: 19 callbacks suppressed
IPVS: fo: UDP 224.0.0.2:0 - no destination available
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5768 Comm: syz-executor 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:__sanitizer_cov_trace_pc+0x31/0x70
Code: 24 65 48 8b 0c 25 08 60 a0 92 65 8b 15 e8 b4 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c <8b> 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48
RSP: 0018:ffffc900034ef398 EFLAGS: 00000046
RAX: ffffffff81de4aff RBX: 0000000000000020 RCX: ffff888020a88000
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000025
RBP: ffffc900034ef4d0 R08: 0000000000585870 R09: 0000000000000005
R10: dffffc0000000000 R11: fffff5200069de8c R12: dffffc0000000000
R13: 0000000000000002 R14: ffffc900034ef608 R15: 0000000000000002
FS:  000055555eb19500(0000) GS:ffff8881a3c1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d1cce7d60 CR3: 000000010fe28000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bpf_bprintf_prepare+0x120f/0x13d0
 bpf_trace_printk+0xdb/0x190
 bpf_prog_0605f9f479290f07+0x38/0x40
 bpf_trace_run1+0x27f/0x4b0
 __bpf_trace_rcu_utilization+0xa1/0xf0
 __traceiter_rcu_utilization+0x7a/0xb0
 trace_rcu_utilization+0x1ad/0x1d0
 rcu_note_context_switch+0xdc1/0x1140
 __schedule+0x35d/0x4cc0
 schedule+0x165/0x360
 do_nanosleep+0x1c7/0x600
 hrtimer_nanosleep+0x169/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e241c1463
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d fe 70 1c 00 00 74 14 b8 e6 00 00 00 0f 05 <f7> d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007fffde90f3c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e241c1463
RDX: 00007fffde90f3e0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000003481c146 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffde90f830
R13: 0000000000000004 R14: 00007fffde90f41c R15: 00007fffde90f4b0
 </TASK>
