INFO: task hung in linkwatch_event (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 56920971 Linux 4.19.109
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1101d991e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c73648903e665531
dashboard link: https://syzkaller.appspot.com/bug?extid=2e5d791c70d2a810b3a5
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2e5d79...@syzkaller.appspotmail.com

ip6t_REJECT: TCP_RESET illegal for non-tcp
x_tables: ip6_tables: icmp6 match: only valid for protocol 58
FAT-fs (loop1): bogus number of reserved sectors
FAT-fs (loop1): Can't find a valid FAT filesystem
INFO: task kworker/0:5:5190 blocked for more than 140 seconds.
Not tainted 4.19.109-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:5 D29576 5190 2 0x80000000
Workqueue: events linkwatch_event
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
linkwatch_event+0xb/0x60 net/core/link_watch.c:236
process_one_work+0x91f/0x1640 kernel/workqueue.c:2153
worker_thread+0x96/0xe20 kernel/workqueue.c:2296
kthread+0x34a/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Showing all locks held in the system:
1 lock held by khungtaskd/1078:
#0: 000000005641f7e3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4436
3 locks held by rs:main Q:Reg/7986:
#0: 00000000ac2f3a8b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767
#1: 000000008a0bb20e (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2775 [inline]
#1: 000000008a0bb20e (sb_writers#4){.+.+}, at: vfs_write+0x418/0x550 fs/read_write.c:548
#2: 000000006c76250f (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1817 [inline]
#2: 000000006c76250f (&rq->lock){-.-.}, at: __schedule+0x1f8/0x1d80 kernel/sched/core.c:3453
1 lock held by rsyslogd/7989:
#0: 0000000030c57a99 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767
2 locks held by getty/8110:
#0: 0000000013a97629 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 00000000c475a915 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8111:
#0: 00000000a5f697cf (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 000000005db6af8c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8112:
#0: 00000000e5d031a9 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 000000008c073add (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8113:
#0: 000000005640c047 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 00000000bd0fee43 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8114:
#0: 00000000dd7928a3 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 00000000fafb20f1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8115:
#0: 000000004a02282e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 00000000a800eed2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8116:
#0: 000000005cb14669 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 000000008ccfa610 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
3 locks held by kworker/0:5/5190:
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: 00000000ad0f1358 ((wq_completion)"events"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2124
#1: 00000000386056a7 ((linkwatch_work).work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2128
#2: 000000009695f2e3 (rtnl_mutex){+.+.}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:236
3 locks held by kworker/u4:0/10443:
3 locks held by kworker/1:0/9198:
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: 00000000cad5a4b6 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2124
#1: 0000000017150454 ((addr_chk_work).work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2128
#2: 000000009695f2e3 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4466
3 locks held by syz-executor.4/4026:

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

NMI backtrace for cpu 1
CPU: 1 PID: 1078 Comm: khungtaskd Not tainted 4.19.109-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x962/0xe40 kernel/hung_task.c:287
kthread+0x34a/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4026 Comm: syz-executor.4 Not tainted 4.19.109-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_release kernel/locking/lockdep.c:3709 [inline]
RIP: 0010:lock_release+0x533/0x820 kernel/locking/lockdep.c:3922
Code: 42 b2 7e 0f 85 47 fc ff ff e8 9d b6 b0 ff e9 3d fc ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e a1 02 00 00 45 8d 4f ff 45 39 8e 78 08 00
RSP: 0018:ffff8880ae607a08 EFLAGS: 00000802
RAX: 0000000000000000 RBX: 1ffff11015cc0f45 RCX: 1ffff1100761e5be
RDX: 1ffff1100761e5bf RSI: 0000000000000002 RDI: ffff88803b0f2580
RBP: ee5b451e63248c55 R08: 0000000000000000 R09: 0000000000000001
R10: ffff88803b0f2e28 R11: ffffffff8b1c1f08 R12: ffffffff815c04ba
R13: 0000000000000003 R14: ffff88803b0f2580 R15: 0000000000000002
FS: 00007f034ea71700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c42b019700 CR3: 000000008c28e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
seqcount_lockdep_reader_access include/linux/seqlock.h:82 [inline]
read_seqcount_begin include/linux/seqlock.h:164 [inline]
ktime_get+0xe6/0x2e0 kernel/time/timekeeping.c:756
clockevents_program_event+0x14a/0x350 kernel/time/clockevents.c:336
tick_program_event+0xb9/0x150 kernel/time/tick-oneshot.c:48
hrtimer_interrupt+0x368/0x770 kernel/time/hrtimer.c:1534
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x91/0xe0 kernel/locking/spinlock.c:184
Code: 48 c7 c0 88 56 b2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d 0e 4c 93 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 d0 8f 27 fa 65 8b 05 39 e3 e2 78
RSP: 0018:ffff8880ae607d08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1164ad1 RBX: 0000000000000286 RCX: 1ffff1100761e5c4
RDX: dffffc0000000000 RSI: ffff88803b0f2e00 RDI: 0000000000000286
RBP: ffffffff8b899c88 R08: ffff88803b0f2580 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888055243310
R13: dffffc0000000000 R14: 1ffff11015cc0fa8 R15: ffff888098262718
debug_object_deactivate lib/debugobjects.c:568 [inline]
debug_object_deactivate+0x1e4/0x360 lib/debugobjects.c:529
debug_rcu_head_unqueue kernel/rcu/rcu.h:205 [inline]
rcu_do_batch kernel/rcu/tree.c:2583 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0xbed/0x17f0 kernel/rcu/tree.c:2881
__do_softirq+0x26c/0x93c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17b/0x1c0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
</IRQ>
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:99 [inline]
RIP: 0010:__local_bh_enable_ip+0x18d/0x270 kernel/softirq.c:196
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 dd 00 00 00 48 83 3d f8 1b 74 07 00 0f 84 8d 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 1c b3 c3 7e 85 c0 74 7d 5b 5d 41 5c c3 80 3d f2 7d 48 08
RSP: 0018:ffff8880471a7510 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1164ad3 RBX: 0000000000000200 RCX: 1ffff1100761e5c4
RDX: dffffc0000000000 RSI: ffff88803b0f2e00 RDI: ffff88803b0f2dfc
RBP: ffffffff85ca9111 R08: ffff88803b0f2580 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803b0f2580
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000000
local_bh_enable include/linux/bottom_half.h:32 [inline]
get_next_corpse net/netfilter/nf_conntrack_core.c:1928 [inline]
nf_ct_iterate_cleanup+0x217/0x4b0 net/netfilter/nf_conntrack_core.c:1951
nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2036 [inline]
nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2021
masq_device_event+0xd6/0x110 net/ipv4/netfilter/nf_nat_masquerade_ipv4.c:100
notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
call_netdevice_notifiers net/core/dev.c:1766 [inline]
dev_close_many+0x30d/0x650 net/core/dev.c:1518
rollback_registered_many+0x2d6/0xc40 net/core/dev.c:8157
rollback_registered+0xf2/0x1c0 net/core/dev.c:8222
unregister_netdevice_queue net/core/dev.c:9275 [inline]
unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9268
unregister_netdevice include/linux/netdevice.h:2614 [inline]
__tun_detach+0xd86/0x1020 drivers/net/tun.c:737
tun_detach drivers/net/tun.c:754 [inline]
tun_chr_close+0xd9/0x180 drivers/net/tun.c:3261
__fput+0x2cd/0x890 fs/file_table.c:278
task_work_run+0x13f/0x1b0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xbcd/0x2f30 kernel/exit.c:880
do_group_exit+0x125/0x350 kernel/exit.c:983
get_signal+0x3ec/0x1f90 kernel/signal.c:2583
do_signal+0x8f/0x1710 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x22b/0x2b0 arch/x86/entry/common.c:163
prepare_exit_to_usermode+0x27b/0x2e0 arch/x86/entry/common.c:198
retint_user+0x8/0x18
RIP: 0033:0x45f50a
Code: 48 39 cf 75 21 48 89 44 24 20 48 89 1c 24 4c 89 44 24 08 48 89 7c 24 10 e8 23 9c ff ff 0f b6 44 24 18 84 c0 75 9f c6 44 24 48 <00> 48 8b 6c 24 28 48 83 c4 30 c3 c6 44 24 48 01 48 8b 6c 24 28 48
RSP: 002b:00007f034ea70c58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045f50a
RDX: 0000000000002f5f RSI: 00007f034ea70c60 RDI: 0000000000000001
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000000c5 R14: 00000000004c338e R15: 000000000076bf2c


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 31acccdc Linux 4.19.157
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12f20572500000
kernel config: https://syzkaller.appspot.com/x/.config?x=1f604e014c43fe09
dashboard link: https://syzkaller.appspot.com/bug?extid=2e5d791c70d2a810b3a5
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12931b26500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=174178a1500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e5d79...@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
INFO: task kworker/0:1:14 blocked for more than 140 seconds.
Not tainted 4.19.157-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/0:1 D26552 14 2 0x80000000

Workqueue: events linkwatch_event
Call Trace:

context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
linkwatch_event+0xb/0x60 net/core/link_watch.c:236
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:0:8130 blocked for more than 140 seconds.
Not tainted 4.19.157-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/0:0 D27416 8130 2 0x80000000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3988
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259

ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Showing all locks held in the system:

3 locks held by kworker/0:1/14:
#0: 00000000e55d9845 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 00000000489dd410 ((linkwatch_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 00000000fb70e3fd (rtnl_mutex){+.+.}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:236
3 locks held by kworker/1:1/25:
#0: 00000000cf9cbaaa ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 0000000005dfb04d ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 00000000fb70e3fd (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475
1 lock held by khungtaskd/1566:
#0: 0000000035d44def (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/7779:
#0: 00000000a612ab87 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
3 locks held by kworker/0:0/8130:
#0: 00000000cf9cbaaa ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 000000007c79bb18 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 00000000fb70e3fd (rtnl_mutex){+.+.}, at: addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3988
4 locks held by syz-executor805/8150:

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

NMI backtrace for cpu 0
CPU: 0 PID: 1566 Comm: khungtaskd Not tainted 4.19.157-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]

dump_stack+0x1fc/0x2fe lib/dump_stack.c:118

nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]

watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:

NMI backtrace for cpu 1

CPU: 1 PID: 8150 Comm: syz-executor805 Not tainted 4.19.157-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RIP: 0010:ieee80211_chanctx_radar_detect+0x258/0x390 net/mac80211/util.c:3492
Code: 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e 00 01 00 00 8b 8b 00 10 00 00 b8 01 00 00 00 48 d3 e0 41 09 c4 <e8> 53 5f a1 f9 48 8d bb f8 07 00 00 48 89 f8 48 c1 e8 03 42 80 3c
RSP: 0018:ffff88809642f3a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880abd40ec0 RCX: ffffffff87c36fce
RDX: 0000000000000000 RSI: ffff8880b07d6600 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880ab2c7920 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000b7c880(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00005588cea94f00 CR3: 00000000a573f000 CR4: 00000000001406e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

ieee80211_check_combinations+0x3b8/0x810 net/mac80211/util.c:3552
ieee80211_check_concurrent_iface+0x46d/0x650 net/mac80211/iface.c:312
ieee80211_runtime_change_iftype net/mac80211/iface.c:1541 [inline]
ieee80211_if_change_type+0x27b/0x5f0 net/mac80211/iface.c:1579
ieee80211_change_iface+0x26/0x220 net/mac80211/cfg.c:157
rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline]
cfg80211_change_iface+0x2e1/0x1530 net/wireless/util.c:936
nl80211_set_interface+0x661/0x830 net/wireless/nl80211.c:3205
genl_family_rcv_msg+0x642/0xc40 net/netlink/genetlink.c:602
genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
genl_rcv+0x24/0x40 net/netlink/genetlink.c:638
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442449
Code: e8 4c ff 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc13fd0128 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442449
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004
RBP: 000000306e616c77 R08: 00000000004002e0 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402fb0
R13: 0000000000403040 R14: 0000000000000000 R15: 0000000000000000
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.239 msecs