INFO: rcu detected stall in lock_is_held_type

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: dcd88898 Linux 4.19.95
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10b04371e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=1f7fa7375205a3ab
dashboard link: https://syzkaller.appspot.com/bug?extid=1f3f9b12fbfd8d6ecaf2
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+1f3f9b...@syzkaller.appspotmail.com

protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (10668 ticks this GP) idle=3d6/1/0x4000000000000004
softirq=252224/252225 fqs=5242
rcu: (t=10501 jiffies g=380081 q=102)
NMI backtrace for cpu 0
CPU: 0 PID: 9788 Comm: syz-executor.0 Not tainted 4.19.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:164 [inline]
rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
update_process_times+0x32/0x80 kernel/time/timer.c:1638
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x111/0x550 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:lock_is_held_type+0x17e/0x210 kernel/locking/lockdep.c:3943
Code: 00 00 00 fc ff df 41 c7 85 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c
10 00 75 63 48 83 3d d1 dc a0 07 00 74 30 48 89 df 57 9d <0f> 1f 44 00 00
48 83 c4 08 44 89 e0 5b 41 5c 41 5d 5d c3 48 83 c4
RSP: 0018:ffff8880ae807cd0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4b79 RBX: 0000000000000286 RCX: ffff888074d0e980
RDX: dffffc0000000000 RSI: ffffffff88f95ba0 RDI: 0000000000000286
RBP: ffff8880ae807cf0 R08: ffff888074d0e100 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000000
R13: ffff888074d0e100 R14: 1ffff11015d00fa6 R15: 0000000000000000
lock_is_held include/linux/lockdep.h:344 [inline]
rcu_read_lock_sched_held+0x110/0x130 kernel/rcu/update.c:118
trace_timer_expire_exit include/trace/events/timer.h:121 [inline]
call_timer_fn+0x632/0x720 kernel/time/timer.c:1327
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1684 [inline]
__run_timers kernel/time/timer.c:1652 [inline]
run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697
__do_softirq+0x25c/0x921 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
</IRQ>
RIP: 0010:batadv_check_known_mac_addr+0xec/0x400
net/batman-adv/hard-interface.c:516
Code: 89 45 c0 49 c1 ee 03 4b 8d 04 26 48 89 45 c8 e8 ea 4b 33 fa 48 8d 7b
14 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 42 0f b6 04 20 <38> d0 7f 08 84
c0 0f 85 52 02 00 00 0f b6 43 14 bf 01 00 00 00 44
RSP: 0018:ffff88802dd6ecf0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff888057be7680 RCX: ffffc90005e86000
RDX: 0000000000000004 RSI: ffffffff8737c9d6 RDI: ffff888057be7694
RBP: ffff88802dd6ed38 R08: ffff888074d0e100 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: dffffc0000000000
R13: ffff8880926ea200 R14: 00000000fffffffd R15: ffff88802dd6edd0
batadv_hardif_add_interface net/batman-adv/hard-interface.c:948 [inline]
batadv_hard_if_event+0xcee/0x11d0 net/batman-adv/hard-interface.c:1038
notifier_call_chain+0xc2/0x230 kernel/notifier.c:93
__raw_notifier_call_chain kernel/notifier.c:394 [inline]
raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401
call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1748
call_netdevice_notifiers net/core/dev.c:1766 [inline]
register_netdevice+0xa4d/0xff0 net/core/dev.c:8756
register_vlan_dev+0x2f9/0x7a0 net/8021q/vlan.c:172
vlan_newlink+0x487/0x700 net/8021q/vlan_netlink.c:189
rtnl_newlink+0x1042/0x1600 net/core/rtnetlink.c:3132
rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4768
netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4786
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:632
___sys_sendmsg+0x803/0x920 net/socket.c:2115
__sys_sendmsg+0x105/0x1d0 net/socket.c:2153
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3e361dcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 000000000000000a
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3e361dd6d4
R13: 00000000004caa88 R14: 00000000004e40f8 R15: 00000000ffffffff
netlink: 20 bytes leftover after parsing attributes in process
`syz-executor.3'.
netlink: 20 bytes leftover after parsing attributes in process
`syz-executor.4'.
net_ratelimit: 22 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
net_ratelimit: 16 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1


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[syzbot]

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