INFO: rcu detected stall in execve

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 414510bc Linux 4.14.142
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=161438f6600000
kernel config: https://syzkaller.appspot.com/x/.config?x=9aa0b2ccd827f416
dashboard link: https://syzkaller.appspot.com/bug?extid=262382590a6170ec8d0a
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+262382...@syzkaller.appspotmail.com

audit: type=1400 audit(1568015574.777:605): avc: denied { map } for
pid=22546 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128
scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0
tclass=file permissive=0
audit: type=1400 audit(1568015574.787:606): avc: denied { map } for
pid=22481 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128
scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0
tclass=file permissive=0
INFO: rcu_sched detected stalls on CPUs/tasks:
1-...: (1 GPs behind) idle=50e/140000000000001/0 softirq=50229/50230
fqs=758
(detected by 0, t=10502 jiffies, g=9424, c=9423, q=69)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 22475 Comm: udevd Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8880587c8100 task.stack: ffff888061c58000
RIP: 0010:hhf_dequeue+0x515/0xa60 net/sched/sch_hhf.c:435
RSP: 0018:ffff8880aef070b0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffff888098397438 RCX: ffff888098397400
RDX: 1ffff11013072e9d RSI: ffff8880983974d0 RDI: ffff8880983974ec
RBP: ffff8880aef07100 R08: 0000000000000000 R09: ffff8880587c8b08
R10: ffff8880587c8ae8 R11: ffff8880587c8100 R12: dffffc0000000000
R13: ffff888098397240 R14: 0000000000000001 R15: ffff8880983974c0
FS: 00007fa7606a77a0(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000046ef00 CR3: 000000006139f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
dequeue_skb net/sched/sch_generic.c:148 [inline]
qdisc_restart net/sched/sch_generic.c:241 [inline]
__qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257
__dev_xmit_skb net/core/dev.c:3235 [inline]
__dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
__br_forward+0x560/0x9c0 net/bridge/br_forward.c:111
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
maybe_deliver net/bridge/br_forward.c:168 [inline]
maybe_deliver net/bridge/br_forward.c:156 [inline]
br_flood+0x3c8/0x530 net/bridge/br_forward.c:210
br_dev_xmit+0x9a4/0xd40 net/bridge/br_device.c:83
__netdev_start_xmit include/linux/netdevice.h:4033 [inline]
netdev_start_xmit include/linux/netdevice.h:4042 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025
__dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
neigh_resolve_output net/core/neighbour.c:1364 [inline]
neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1344
neigh_output include/net/neighbour.h:500 [inline]
ip6_finish_output2+0x9ab/0x21b0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:462 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483
ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:677
addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1634 [inline]
__run_timers kernel/time/timer.c:1602 [inline]
run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647
__do_softirq+0x244/0x9a0 kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x160/0x1b0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779
[inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline]
RIP: 0010:qlist_free_all+0x10c/0x150 mm/kasan/quarantine.c:166
RSP: 0018:ffff888061c5f888 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff1100b0f9134
RDX: 0000000000000000 RSI: ffff8880587c89a8 RDI: 0000000000000286
RBP: ffff888061c5f8b8 R08: ffff8880587c8100 R09: ffff8880587c89a0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888083f56800 R14: ffff888061c5f8c8 R15: ffff88821f8b5680
quarantine_reduce+0x147/0x180 mm/kasan/quarantine.c:259
kasan_kmalloc+0xa0/0xf0 mm/kasan/kasan.c:536
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
slab_post_alloc_hook mm/slab.h:442 [inline]
slab_alloc mm/slab.c:3390 [inline]
kmem_cache_alloc+0x11b/0x780 mm/slab.c:3550
kmem_cache_zalloc include/linux/slab.h:651 [inline]
file_alloc_security security/selinux/hooks.c:368 [inline]
selinux_file_alloc_security+0xb4/0x190 security/selinux/hooks.c:3475
security_file_alloc+0x6d/0xa0 security/security.c:874
get_empty_filp+0x162/0x3f0 fs/file_table.c:129
path_openat+0x8f/0x3f70 fs/namei.c:3542
do_filp_open+0x18e/0x250 fs/namei.c:3600
do_open_execat+0xe7/0x4a0 fs/exec.c:849
do_execveat_common.isra.0+0x6d5/0x1dd0 fs/exec.c:1740
do_execve fs/exec.c:1847 [inline]
SYSC_execve fs/exec.c:1928 [inline]
SyS_execve+0x39/0x50 fs/exec.c:1923
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7fa75fd8b207
RSP: 002b:00007ffcb3a263d8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa75fd8b207
RDX: 00000000014c21f0 RSI: 00007ffcb3a264d0 RDI: 00007ffcb3a274e0
RBP: 0000000000625500 R08: 0000000000004e7a R09: 0000000000004e7a
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000014c21f0
R13: 0000000000000008 R14: 000000000147a030 R15: 0000000000000005
Code: 6d fc 49 8d 8d c0 01 00 00 8b 45 b8 48 8d 53 f0 48 39 d1 74 37 e8 3c
51 6d fc 49 8d bd ac 02 00 00 8b 45 b8 48 89 fa 48 c1 ea 03 <42> 0f b6 0c
22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f
rcu_sched kthread starved for 8977 jiffies! g9424 c9423 f0x0
RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=0
rcu_sched I29776 9 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744
rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: rcu_preempt self-detected stall on CPU
1-...: (1 GPs behind) idle=50e/140000000000002/0 softirq=50229/50230
fqs=701
(t=10501 jiffies g=11162 c=11161 q=1710)
rcu_preempt kthread starved for 9099 jiffies! g11162 c11161 f0x0
RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=0
INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu_preempt I
29776 8 2 0x80000000
1-...: (1 GPs behind) idle=50e/140000000000002/0 softirq=50229/50230
fqs=701
Call Trace:
(detected by 0, t=10502 jiffies, g=11162, c=11161, q=1710)
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
Sending NMI from CPU 0 to CPUs 1:
schedule+0x92/0x1c0 kernel/sched/core.c:3427
NMI backtrace for cpu 1
CPU: 1 PID: 22475 Comm: udevd Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8880587c8100 task.stack: ffff888061c58000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline]
RIP: 0010:lock_acquire+0x30a/0x430 kernel/locking/lockdep.c:3990
RSP: 0018:ffff8880aef06958 EFLAGS: 00000007
RAX: 0000000000000001 RBX: ffff8880587c8100 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880587c897c
RBP: ffff8880aef069a0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff87786f80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fa7606a77a0(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000046ef00 CR3: 000000006139f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
console_lock_spinning_enable kernel/printk/printk.c:1582 [inline]
console_unlock+0x3db/0xed0 kernel/printk/printk.c:2388
vprintk_emit kernel/printk/printk.c:1917 [inline]
vprintk_emit+0x1f9/0x600 kernel/printk/printk.c:1882
vprintk_default+0x28/0x30 kernel/printk/printk.c:1957
vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1990
printk_stack_address arch/x86/kernel/dumpstack.c:70 [inline]
show_trace_log_lvl+0x22d/0x26b arch/x86/kernel/dumpstack.c:202
show_stack+0x39/0x3b arch/x86/kernel/dumpstack.c:237
sched_show_task kernel/sched/core.c:5167 [inline]
sched_show_task.cold+0x2f0/0x351 kernel/sched/core.c:5142
rcu_check_gp_kthread_starvation+0x28e/0x2c7 kernel/rcu/tree.c:1374
print_cpu_stall kernel/rcu/tree.c:1540 [inline]
check_cpu_stall kernel/rcu/tree.c:1610 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0x435/0xd0a kernel/rcu/tree.c:2792
update_process_times+0x31/0x70 kernel/time/timer.c:1588
tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:161
tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219
__run_hrtimer kernel/time/hrtimer.c:1220 [inline]
__hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1284
hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:__list_del_entry include/linux/list.h:117 [inline]
RIP: 0010:list_move_tail include/linux/list.h:182 [inline]
RIP: 0010:hhf_dequeue+0x571/0xa60 net/sched/sch_hhf.c:438
RSP: 0018:ffff8880aef070b0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff888098397438 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffff8880983974d0 RDI: ffff888098397454
RBP: ffff8880aef07100 R08: 0000000000000000 R09: ffff8880587c8b08
R10: ffff8880587c8ae8 R11: ffff8880587c8100 R12: dffffc0000000000
R13: ffff888098397240 R14: 0000000000000000 R15: ffff8880983974c0
dequeue_skb net/sched/sch_generic.c:148 [inline]
qdisc_restart net/sched/sch_generic.c:241 [inline]
__qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257
__dev_xmit_skb net/core/dev.c:3235 [inline]
__dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
__br_forward+0x560/0x9c0 net/bridge/br_forward.c:111
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
maybe_deliver net/bridge/br_forward.c:168 [inline]
maybe_deliver net/bridge/br_forward.c:156 [inline]
br_flood+0x3c8/0x530 net/bridge/br_forward.c:210
br_dev_xmit+0x9a4/0xd40 net/bridge/br_device.c:83
__netdev_start_xmit include/linux/netdevice.h:4033 [inline]
netdev_start_xmit include/linux/netdevice.h:4042 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025
__dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
neigh_resolve_output net/core/neighbour.c:1364 [inline]
neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1344
neigh_output include/net/neighbour.h:500 [inline]
ip6_finish_output2+0x9ab/0x21b0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:462 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483
ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:677
addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1634 [inline]
__run_timers kernel/time/timer.c:1602 [inline]
run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647
__do_softirq+0x244/0x9a0 kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x160/0x1b0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779
[inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline]
RIP: 0010:qlist_free_all+0x10c/0x150 mm/kasan/quarantine.c:166
RSP: 0018:ffff888061c5f888 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff1100b0f9134
RDX: 0000000000000000 RSI: ffff8880587c89a8 RDI: 0000000000000286
RBP: ffff888061c5f8b8 R08: ffff8880587c8100 R09: ffff8880587c89a0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888083f56800 R14: ffff888061c5f8c8 R15: ffff88821f8b5680
quarantine_reduce+0x147/0x180 mm/kasan/quarantine.c:259
kasan_kmalloc+0xa0/0xf0 mm/kasan/kasan.c:536
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
slab_post_alloc_hook mm/slab.h:442 [inline]
slab_alloc mm/slab.c:3390 [inline]
kmem_cache_alloc+0x11b/0x780 mm/slab.c:3550
kmem_cache_zalloc include/linux/slab.h:651 [inline]
file_alloc_security security/selinux/hooks.c:368 [inline]
selinux_file_alloc_security+0xb4/0x190 security/selinux/hooks.c:3475
security_file_alloc+0x6d/0xa0 security/security.c:874
get_empty_filp+0x162/0x3f0 fs/file_table.c:129
path_openat+0x8f/0x3f70 fs/namei.c:3542
do_filp_open+0x18e/0x250 fs/namei.c:3600
do_open_execat+0xe7/0x4a0 fs/exec.c:849
do_execveat_common.isra.0+0x6d5/0x1dd0 fs/exec.c:1740
do_execve fs/exec.c:1847 [inline]
SYSC_execve fs/exec.c:1928 [inline]
SyS_execve+0x39/0x50 fs/exec.c:1923
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7fa75fd8b207
RSP: 002b:00007ffcb3a263d8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa75fd8b207
RDX: 00000000014c21f0 RSI: 00007ffcb3a264d0 RDI: 00007ffcb3a274e0
RBP: 0000000000625500 R08: 0000000000004e7a R09: 0000000000004e7a
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000014c21f0
R13: 0000000000000008 R14: 000000000147a030 R15: 0000000000000005
Code: 48 85 c0 75 9c 44 8b 5d c0 65 ff 0d 21 9d b9 7e 0f 85 2c fe ff ff e8
ca f1 b7 ff e9 22 fe ff ff 44 89 5d c0 65 ff 05 06 9d b9 7e <48> 8b 05 17
8a d9 06 e8 aa db 04 00 44 8b 5d c0 85 c0 74 09 80
rcu_preempt kthread starved for 9100 jiffies! g11162 c11161 f0x0
RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=0
schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744
rcu_preempt I
29776 8 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
schedule+0x92/0x1c0 kernel/sched/core.c:3427
schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255
CPU: 1 PID: 22475 Comm: udevd Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
kthread+0x319/0x430 kernel/kthread.c:232
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x197 lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396
print_cpu_stall kernel/rcu/tree.c:1542 [inline]
check_cpu_stall kernel/rcu/tree.c:1610 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792
update_process_times+0x31/0x70 kernel/time/timer.c:1588
tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:161
tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219
__run_hrtimer kernel/time/hrtimer.c:1220 [inline]
__hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1284
hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:__list_del_entry include/linux/list.h:117 [inline]
RIP: 0010:list_move_tail include/linux/list.h:182 [inline]
RIP: 0010:hhf_dequeue+0x571/0xa60 net/sched/sch_hhf.c:438
RSP: 0018:ffff8880aef070b0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffff888098397438 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffff8880983974d0 RDI: ffff888098397454
RBP: ffff8880aef07100 R08: 0000000000000000 R09: ffff8880587c8b08
R10: ffff8880587c8ae8 R11: ffff8880587c8100 R12: dffffc0000000000
R13: ffff888098397240 R14: 0000000000000000 R15: ffff8880983974c0
dequeue_skb net/sched/sch_generic.c:148 [inline]
qdisc_restart net/sched/sch_generic.c:241 [inline]
__qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257
__dev_xmit_skb net/core/dev.c:3235 [inline]
__dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
br_forward_finish+0xbc/0x320 net/bridge/br_forward.c:67
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
__br_forward+0x560/0x9c0 net/bridge/br_forward.c:111
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127
maybe_deliver net/bridge/br_forward.c:168 [inline]
maybe_deliver net/bridge/br_forward.c:156 [inline]
br_flood+0x3c8/0x530 net/bridge/br_forward.c:210
br_dev_xmit+0x9a4/0xd40 net/bridge/br_device.c:83
__netdev_start_xmit include/linux/netdevice.h:4033 [inline]
netdev_start_xmit include/linux/netdevice.h:4042 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x18c/0x8b0 net/core/dev.c:3025
__dev_queue_xmit+0x1d95/0x25e0 net/core/dev.c:3525
dev_queue_xmit+0x18/0x20 net/core/dev.c:3558
neigh_resolve_output net/core/neighbour.c:1364 [inline]
neigh_resolve_output+0x4d8/0x870 net/core/neighbour.c:1344
neigh_output include/net/neighbour.h:500 [inline]
ip6_finish_output2+0x9ab/0x21b0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:462 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483
ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:677
addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1634 [inline]
__run_timers kernel/time/timer.c:1602 [inline]
run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647
__do_softirq+0x244/0x9a0 kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x160/0x1b0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779
[inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline]
RIP: 0010:qlist_free_all+0x10c/0x150 mm/kasan/quarantine.c:166
RSP: 0018:ffff888061c5f888 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff1100b0f9134
RDX: 0000000000000000 RSI: ffff8880587c89a8 RDI: 0000000000000286
RBP: ffff888061c5f8b8 R08: ffff8880587c8100 R09: ffff8880587c89a0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888083f56800 R14: ffff888061c5f8c8 R15: ffff88821f8b5680
quarantine_reduce+0x147/0x180 mm/kasan/quarantine.c:259
kasan_kmalloc+0xa0/0xf0 mm/kasan/kasan.c:536
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
slab_post_alloc_hook mm/slab.h:442 [inline]
slab_alloc mm/slab.c:3390 [inline]
kmem_cache_alloc+0x11b/0x780 mm/slab.c:3550
kmem_cache_zalloc include/linux/slab.h:651 [inline]
file_alloc_security security/selinux/hooks.c:368 [inline]
selinux_file_alloc_security+0xb4/0x190 security/selinux/hooks.c:3475
security_file_alloc+0x6d/0xa0 security/security.c:874
get_empty_filp+0x162/0x3f0 fs/file_table.c:129
path_openat+0x8f/0x3f70 fs/namei.c:3542
do_filp_open+0x18e/0x250 fs/namei.c:3600
do_open_execat+0xe7/0x4a0 fs/exec.c:849
do_execveat_common.isra.0+0x6d5/0x1dd0 fs/exec.c:1740
do_execve fs/exec.c:1847 [inline]
SYSC_execve fs/exec.c:1928 [inline]
SyS_execve+0x39/0x50 fs/exec.c:1923
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7fa75fd8b207
RSP: 002b:00007ffcb3a263d8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa75fd8b207
RDX: 00000000014c21f0 RSI: 00007ffcb3a264d0 RDI: 00007ffcb3a274e0
RBP: 0000000000625500 R08: 0000000000004e7a R09: 0000000000004e7a
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000014c21f0
R13: 0000000000000008 R14: 000000000147a030 R15: 0000000000000005


---
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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.