INFO: task syz.2.16644:11594 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.16644     state:D stack:25872 pid:11594 tgid:11584 ppid:5598   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 nfsd_nl_listener_set_doit+0x53d/0x1ab0
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bd/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98fb19e559
RSP: 002b:00007f98fc0b9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f98fb426090 RCX: 00007f98fb19e559
RDX: 000000000000c000 RSI: 0000200000000100 RDI: 0000000000000006
RBP: 00007f98fb2358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98fb426128 R14: 00007f98fb426090 R15: 00007ffee2215168
 </TASK>

Showing all locks held in the system:
locks held by ksoftirqd/0/15: 1, last CPU#0:
 #0: ffff888120e28298 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x466/0xa10
locks held by khungtaskd/35: 1, last CPU#1:
 #0: ffffffff8fd5c8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5421: 2, on CPU#0:
 #0: ffff88811222f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034932e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by syz.1.16587/11365: 2, on CPU#1:
 #0: ffffffff912c6388 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff9009f5e0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x53d/0x1ab0
locks held by syz.2.16644/11594: 2, on CPU#1:
 #0: ffffffff912c6388 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff9009f5e0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x53d/0x1ab0
locks held by syz.4.17684/16210: 1, last CPU#1:
 #0: ffffffff8fd5c8a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by syz.0.17688/16237: 1, last CPU#0:
 #0: ffffffff8fe6a380 (pcpu_alloc_mutex){+.+.}-{4:4}, at: pcpu_alloc_noprof+0x231/0x1900

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 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: 16237 Comm: syz.0.17688 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:hrtimer_interrupt+0x90b/0xaa0
Code: 24 c6 00 01 48 8d 7b 4e 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 01 01 00 00 c6 43 4e 00 48 8d bb 80 00 00 00 48 89 f8 <48> c1 e8 03 42 80 3c 28 00 74 05 e8 65 77 84 00 4c 89 a3 80 00 00
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000046
RAX: ffff888120e28300 RBX: ffff888120e28280 RCX: ffff88810a401e00
RDX: 8000000001000101 RSI: 0000000001000101 RDI: ffff888120e28300
RBP: ffff888120e286a8 R08: 0000000001000101 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffffff81774d40 R12: 000001ce6f6e063b
R13: dffffc0000000000 R14: 000001ce6f6a1101 R15: 18de9b1c6d49b1b7
FS:  00007f15c881e6c0(0000) GS:ffff88818c4c1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15c881dff8 CR3: 00000001a1dfc000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 cd 2f b9 f5 f7 c3 00 02 00 00 74 05 e8 50 7d e5 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 04 2d aa f5 65 48 8b 05 4c 30 ab 08 48 85 c0 74 18 5b 41 5e e9
RSP: 0018:ffffc90000007f18 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000283 RCX: 8000000000000102
RDX: 0000000000000002 RSI: ffffffff8e467bf7 RDI: 0000000000000001
RBP: 0000000000000008 R08: ffffffff917a6e7f R09: 1ffffffff22f4dcf
R10: dffffc0000000000 R11: fffffbfff22f4dd0 R12: 0000000000000009
R13: 0000000000000008 R14: ffff888120e28280 R15: 0000000000000100
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x413/0xc60
Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 c7 af 54 0a e8 a2 2d 3a 00 fb 4c 8b 65 c8 <49> 8d bc 24 18 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc90027a9f620 EFLAGS: 00000206
RAX: 0000000000000e2d RBX: ffff888120e3c8e0 RCX: 8000000000000001
RDX: 0000000000000006 RSI: ffffffff8e467bf7 RDI: ffffffff8c6dd780
RBP: ffffc90027a9f670 R08: ffffffff917a6e7f R09: 1ffffffff22f4dcf
R10: dffffc0000000000 R11: fffffbfff22f4dd0 R12: ffff88810a401e00
R13: ffff888120e3c8a8 R14: dffffc0000000000 R15: 1ffff110241c791c
 __schedule+0x17e3/0x58f0
 preempt_schedule_common+0x7f/0xd0
 preempt_schedule_thunk+0x16/0x40
 _raw_spin_unlock_irqrestore+0x76/0x80
 pcpu_alloc_noprof+0xab1/0x1900
 bpf_map_alloc_percpu+0x65/0x180
 prealloc_init+0x214/0x650
 htab_map_alloc+0x6a0/0xc90
 map_create+0xf3d/0x1b70
 __sys_bpf+0xaea/0xd90
 __x64_sys_bpf+0xba/0xd0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f15c799e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f15c881e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f15c7c26270 RCX: 00007f15c799e559
RDX: 0000000000000050 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f15c7a358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15c7c26308 R14: 00007f15c7c26270 R15: 00007ffcd1f52318
 </TASK>
