INFO: rcu_preempt self-detected stall on CPU
1-...: (1 GPs behind) idle=fe2/140000000000002/0 softirq=12224/12225 fqs=1
(t=10500 jiffies g=1914 c=1913 q=736)
rcu_preempt kthread starved for 10498 jiffies! g1914 c1913 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt R running task 29920 8 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 7838 Comm: syz-executor.3 Not tainted 4.14.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
rcu_dump_cpu_stacks+0x16d/0x1b8 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+0x490/0xdaa kernel/rcu/tree.c:2792
update_process_times+0x29/0x60 kernel/time/timer.c:1590
tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165
tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223
__run_hrtimer kernel/time/hrtimer.c:1223 [inline]
__hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287
hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:queued_write_lock_slowpath+0x85/0x1d0 kernel/locking/qrwlock.c:130
RSP: 0018:ffff8880aeb07810 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: ffffffff8877d4b0 RCX: 00000000d950903b
RDX: 0000000000000000 RSI: ffff88804c410f48 RDI: ffffffff8877d4b0
RBP: ffffffff8877d4b4 R08: 0000000000005ab8 R09: ffffffff8a088e80
R10: ffff88804c410f48 R11: ffff88804c410600 R12: fffffbfff10efa96
R13: 0000000000000000 R14: 0000000000000001 R15: ffff888087d55000
queued_write_lock include/asm-generic/qrwlock.h:134 [inline]
do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203
neigh_forced_gc net/core/neighbour.c:176 [inline]
neigh_alloc net/core/neighbour.c:315 [inline]
__neigh_create+0xb27/0x1980 net/core/neighbour.c:499
ip6_finish_output2+0xa8e/0x2150 net/ipv6/ip6_output.c:117
ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x1c9/0x650 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+0x125/0x630 net/ipv6/ndisc.c:677
addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3997
RSP: 0018:ffff88804c41f928 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2ce1 RBX: ffff88804c410600 RCX: 00000000d8169900
RDX: dffffc0000000000 RSI: ffff88804c410ea8 RDI: 0000000000000286
RBP: ffffffff87e56be0 R08: 0000000000007b63 R09: ffffffff8a0993d8
R10: ffff88804c410ea8 R11: ffff88804c410600 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
kernfs_activate+0x2a/0x180 fs/kernfs/dir.c:1235
kernfs_add_one+0x2ee/0x3a0 fs/kernfs/dir.c:794
kernfs_create_dir_ns+0xe5/0x130 fs/kernfs/dir.c:1007
kernfs_create_dir include/linux/kernfs.h:502 [inline]
internal_create_group+0xea/0x7e0 fs/sysfs/group.c:124
loop_sysfs_init drivers/block/loop.c:821 [inline]
loop_set_fd drivers/block/loop.c:946 [inline]
lo_ioctl+0x1123/0x1c40 drivers/block/loop.c:1417
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x91d/0x17d0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c2e7
RSP: 002b:00007fb17eb11a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb17eb126d4 RCX: 000000000045c2e7
RDX: 0000000000000008 RSI: 0000000000004c00 RDI: 0000000000000009
RBP: 000000000076bf20 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000be0 R14: 00000000004cdc17 R15: 000000000076bf2c
INFO: rcu_sched detected stalls on CPUs/tasks:
1-...: (1 GPs behind) idle=fe2/140000000000001/0 softirq=12224/12225 fqs=1
(detected by 0, t=10562 jiffies, g=1298, c=1297, q=3)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7838 Comm: syz-executor.3 Not tainted 4.14.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88804c410600 task.stack: ffff88804c418000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:queued_write_lock_slowpath+0x80/0x1d0 kernel/locking/qrwlock.c:130
RSP: 0018:ffff8880aeb07810 EFLAGS: 00000286
RAX: 00000000000000ff RBX: ffffffff8877d4b0 RCX: 00000000d950903b
RDX: 0000000000000000 RSI: ffff88804c410f48 RDI: ffffffff8877d4b0
RBP: ffffffff8877d4b4 R08: 0000000000005ab8 R09: ffffffff8a088e80
R10: ffff88804c410f48 R11: ffff88804c410600 R12: fffffbfff10efa96
R13: 0000000000000000 R14: 0000000000000001 R15: ffff888087d55000
FS: 00007fb17eb12700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdf063dd90 CR3: 0000000091fa4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
queued_write_lock include/asm-generic/qrwlock.h:134 [inline]
do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203
neigh_forced_gc net/core/neighbour.c:176 [inline]
neigh_alloc net/core/neighbour.c:315 [inline]
__neigh_create+0xb27/0x1980 net/core/neighbour.c:499
ip6_finish_output2+0xa8e/0x2150 net/ipv6/ip6_output.c:117
ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x1c9/0x650 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+0x125/0x630 net/ipv6/ndisc.c:677
addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3997
RSP: 0018:ffff88804c41f928 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2ce1 RBX: ffff88804c410600 RCX: 00000000d8169900
RDX: dffffc0000000000 RSI: ffff88804c410ea8 RDI: 0000000000000286
RBP: ffffffff87e56be0 R08: 0000000000007b63 R09: ffffffff8a0993d8
R10: ffff88804c410ea8 R11: ffff88804c410600 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
kernfs_activate+0x2a/0x180 fs/kernfs/dir.c:1235
kernfs_add_one+0x2ee/0x3a0 fs/kernfs/dir.c:794
kernfs_create_dir_ns+0xe5/0x130 fs/kernfs/dir.c:1007
kernfs_create_dir include/linux/kernfs.h:502 [inline]
internal_create_group+0xea/0x7e0 fs/sysfs/group.c:124
loop_sysfs_init drivers/block/loop.c:821 [inline]
loop_set_fd drivers/block/loop.c:946 [inline]
lo_ioctl+0x1123/0x1c40 drivers/block/loop.c:1417
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x91d/0x17d0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c2e7
RSP: 002b:00007fb17eb11a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb17eb126d4 RCX: 000000000045c2e7
RDX: 0000000000000008 RSI: 0000000000004c00 RDI: 0000000000000009
RBP: 000000000076bf20 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000be0 R14: 00000000004cdc17 R15: 000000000076bf2c
Code: 0f 84 d3 00 00 00 49 89 dc 49 89 dd 41 be 01 00 00 00 49 c1 ec 03 41 83 e5 07 48 b8 00 00 00 00 00 fc ff df 49 01 c4 eb 02 f3 90 <41> 0f b6 04 24 44 38 e8 7f 08 84 c0 0f 85 f6 00 00 00 0f b6 03
rcu_sched kthread starved for 10560 jiffies! g1298 c1297 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_sched R running task 29984 9 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
audit: type=1400 audit(1583446807.911:46): avc: denied { map } for pid=7855 comm="syz-executor.4" path=2F6D656D66643A23656D31232B202864656C6574656429 dev="tmpfs" ino=30017 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:tmpfs_t:s0 tclass=file permissive=1
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.