INFO: task syz.0.11797:15306 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.11797     state:D stack:24760 pid:15306 tgid:15305 ppid:5611   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x157d/0x50e0
 schedule+0x164/0x360
 schedule_timeout+0xc0/0x2c0
 wait_for_completion+0x2ca/0x5e0
 disable_device+0x1c6/0x330
 __ib_unregister_device+0x2c9/0x400
 ib_unregister_device_and_put+0xb8/0xf0
 nldev_dellink+0x288/0x320
 rdma_nl_rcv+0x6f6/0xa40
 netlink_unicast+0x833/0x9f0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0xa67/0xad0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1beb59ce59
RSP: 002b:00007f1bec376028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1beb815fa0 RCX: 00007f1beb59ce59
RDX: 0000000000040004 RSI: 00002000000002c0 RDI: 0000000000000004
RBP: 00007f1beb632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1beb816038 R14: 00007f1beb815fa0 R15: 00007ffe94d34078
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e356e40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5438:
 #0: ffff88817449e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
1 lock held by syz-executor/5620:
 #0: ffffffff8e35d738 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3f2/0x7e0
4 locks held by kworker/u8:12/26018:
 #0: ffff888100eef948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90005d6fb80 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8f737610 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffff888110810700 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x38/0x300
3 locks held by kworker/1:14/28075:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc900041afb80 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8e35d738 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3f2/0x7e0
2 locks held by syz.0.11797/15306:
 #0: ffffffff9a02eff8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv+0x340/0xa40
 #1: ffff888110810700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x279/0x400
2 locks held by syz.4.13196/20400:
 #0: ffffffff8f7493a8 (bpf_dispatcher_xdp.mutex){+.+.}-{4:4}, at: bpf_dispatcher_change_prog+0xc2/0xf20
 #1: ffffffff8e35d738 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3f2/0x7e0

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0x1a9/0x280
 nmi_cpu_backtrace+0x3a9/0x3e0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf54/0xfa0
 kthread+0x787/0x910
 ret_from_fork+0x5b0/0xb20
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21430 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:page_ext_get+0x199/0x2e0
Code: 9c 8b ff 41 83 e4 7f 41 c1 e4 05 4d 01 e7 eb 0f e8 fc 9b 8b ff eb 05 e8 f5 9b 8b ff 45 31 ff 49 83 c7 10 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 c8 0e f4 ff 4d 8b 3f e8 40 82 6f
RSP: 0018:ffffc90005097aa8 EFLAGS: 00000a02
RAX: 1ffff1102bfff552 RBX: ffffffff823840d2 RCX: ffff888172da8000
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff823840d2 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e356e40 R12: 0000000000000680
R13: dffffc0000000000 R14: 00000000001a36b3 R15: ffff88815fffaa90
FS:  0000555593450500(0000) GS:ffff88818e448000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38de547e20 CR3: 000000000e144000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __reset_page_owner+0x28/0x1f0
 __free_frozen_pages+0xbe4/0xd60
 vfree+0x25b/0x400
 kcov_close+0x28/0x50
 __fput+0x41f/0xa40
 task_work_run+0x1d9/0x270
 do_exit+0x6fa/0x23b0
 do_group_exit+0x22d/0x2f0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x2210/0x2210
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7e139ce59
Code: Unable to access opcode bytes at 0x7fa7e139ce2f.
RSP: 002b:00007ffceb227278 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa7e1433db7 RCX: 00007fa7e139ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007fa7e1433dc9 R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00000000000927c0 R14: 0000000000166bee R15: 00007ffceb227420
 </TASK>
