INFO: task syz.5.3490:14558 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.3490      state:D stack:26048 pid:14558 tgid:14557 ppid:13326  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 nfsd_nl_svc_export_set_reqs_doit+0x132/0x1450
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bb/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+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f220db9ce59
RSP: 002b:00007f220ea5a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f220de15fa0 RCX: 00007f220db9ce59
RDX: 0000000024000004 RSI: 0000200000000640 RDI: 0000000000000006
RBP: 00007f220dc32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f220de16038 R14: 00007f220de15fa0 R15: 00007fff755bd058
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/u10:5/89:
2 locks held by getty/5444:
 #0: ffff8881686f60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
2 locks held by syz.4.3289/14112:
 #0: ffffffff8fe5bae8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ec8eaa0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x2b9/0xc30
2 locks held by syz.5.3490/14558:
 #0: ffffffff8fe5bae8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ec8eaa0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_svc_export_set_reqs_doit+0x132/0x1450
2 locks held by syz.6.3545/14715:
 #0: ffffffff8fe5bae8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ec8eaa0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_unlock_export_doit+0x2cf/0x530
3 locks held by kworker/u11:4/16507:
 #0: ffff8880367c1140 ((wq_completion)hci5){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000a17c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff888020a94ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1cb/0x3f0
1 lock held by syz.1.4548/17749:

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

NMI backtrace for cpu 0
CPU: 0 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+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 17749 Comm: syz.1.4548 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: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 e9 80 67 41 0a cc 89 f6 31 d2 e9 b6 c4 80 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a08570 EFLAGS: 00000046
RAX: 00000000000002c0 RBX: ffff88823c623c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000002c0 RDI: 0000000000000838
RBP: ffffc90000a08630 R08: ffffffff81b369b5 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff81744530 R12: 00000000000002c0
R13: dffffc0000000000 R14: 0000000010007068 R15: 0000000000000020
FS:  00007f407626d6c0(0000) GS:ffff8882a9224000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40753ea540 CR3: 000000010dd8c000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x26c/0x420
 irqentry_exit+0x8b7/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d d4 bc 63 0c 48 89 de 5b e9 93 30 62 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 78 4c 79 11 65 8b 15 99 4c 79
RSP: 0018:ffffc90000a08788 EFLAGS: 00000246
RAX: 1ffff11035f21887 RBX: 0000000000000000 RCX: ffff888111090000
RDX: 0000000000000100 RSI: 00007f407539ce59 RDI: ffffffffa0000894
RBP: 0000000000000000 R08: ffffffff81d6c4a6 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e959c60 R12: ffffffffa0000894
R13: dffffc0000000000 R14: 00007f407539ce59 R15: 0000000000000000
 is_bpf_text_address+0x1c3/0x2b0
 kernel_text_address+0xa5/0xe0
 __kernel_text_address+0xd/0x30
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 skb_release_data+0x85e/0xab0
 __kfree_skb+0x5d/0x210
 mac80211_hwsim_beacon_tx+0x396/0x820
 __iterate_interfaces+0x2af/0x5a0
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180
 mac80211_hwsim_beacon+0xaf/0x240
 __hrtimer_run_queues+0x3bc/0xa10
 hrtimer_run_softirq+0x17a/0x240
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:deref_stack_reg+0xa7/0x220
Code: 4c 89 fb 48 c1 eb 03 0f b6 04 33 84 c0 0f 85 39 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c5 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 <3c> 01 75 18 49 8d 40 08 48 39 e8 0f 97 c1 4c 39 f0 0f 96 c0 84 c1
RSP: 0018:ffffc9000697ebd8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92000d2fd99 RCX: 0000000000000001
RDX: ffffc9000697ed08 RSI: dffffc0000000000 RDI: ffffc9000697ecd8
RBP: ffffc90006978000 R08: ffffc9000697fbf0 R09: 0000000000000000
R10: ffffc9000697ed18 R11: fffff52000d2fda5 R12: 1ffff92000d2fd9a
R13: 1ffff92000d2fd9b R14: ffffc90006980000 R15: ffffc9000697ecc8
 unwind_next_frame+0x19bd/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x4c3/0x730
 krealloc_node_align_noprof+0x19a/0x390
 copy_array+0x71/0x100
 bpf_copy_verifier_state+0x990/0x1150
 push_stack+0x19d/0x3b0
 do_check_insn+0xd387/0x198e0
 do_check_common+0x39d6/0x5740
 do_check_main+0x63/0x1f0
 bpf_check+0x4bdb/0x56d0
 bpf_prog_load+0x1716/0x1d70
 __sys_bpf+0xc2d/0xcb0
 __x64_sys_bpf+0xba/0xd0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f407539ce59
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:00007f407626d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4075615fa0 RCX: 00007f407539ce59
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f4075432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4075616038 R14: 00007f4075615fa0 R15: 00007ffd9d1145a8
 </TASK>
