general protection fault in send_hsr_supervision_frame (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c196b3a9 Linux 4.14.210
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12fe745d500000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e5088ac39d46cc4
dashboard link: https://syzkaller.appspot.com/bug?extid=b48e9fb48e8ca69071c8
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b48e9f...@syzkaller.appspotmail.com

Bluetooth: hci4 command 0x040f tx timeout
device hsr_slave_1 left promiscuous mode
device hsr_slave_0 left promiscuous mode
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8880b5ff2140 task.stack: ffff8880b5ff8000
RIP: 0010:send_hsr_supervision_frame+0x32/0xf00 net/hsr/hsr_device.c:263
RSP: 0018:ffff8880ba407ca0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff1197fac
RDX: 0000000000000002 RSI: 0000000000000017 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000022012
R10: ffff8880b5ff2a90 R11: ffff8880b5ff2140 R12: 0000000000000000
R13: ffff88805e818be0 R14: 0000000000000010 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30039000 CR3: 00000000a19a7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
hsr_announce+0xf0/0x330 net/hsr/hsr_device.c:350
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
__run_timers kernel/time/timer.c:1637 [inline]
run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650
__do_softirq+0x254/0xa1d kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x193/0x240 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+0x93/0xa0 arch/x86/entry/entry_64.S:793
</IRQ>
RIP: 0010:preempt_count_sub+0x4b/0x130 kernel/sched/core.c:3136
RSP: 0018:ffff8880b5fff360 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffff8880b5fff320 RDI: 0000000000000001
RBP: ffff8880b5fff548 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880b5fff548 R11: 0000000000000001 R12: ffff8880b5ff8000
R13: ffff8880b5fff500 R14: ffff8880b5fff518 R15: ffff8880b5fff4c8
unwind_next_frame+0xe54/0x17d0 arch/x86/kernel/unwind_orc.c:498
__unwind_start+0x594/0x930 arch/x86/kernel/unwind_orc.c:583
unwind_start arch/x86/include/asm/unwind.h:60 [inline]
__save_stack_trace+0x63/0x160 arch/x86/kernel/stacktrace.c:43
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696
__kmalloc_reserve net/core/skbuff.c:137 [inline]
__alloc_skb+0x96/0x510 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:980 [inline]
nlmsg_new include/net/netlink.h:511 [inline]
inet6_netconf_notify_devconf+0x6d/0x170 net/ipv6/addrconf.c:589
__addrconf_sysctl_unregister net/ipv6/addrconf.c:6452 [inline]
addrconf_sysctl_unregister+0x131/0x1c0 net/ipv6/addrconf.c:6476
addrconf_ifdown.isra.0+0xf40/0x13f0 net/ipv6/addrconf.c:3737
addrconf_notify+0x116/0x1c20 net/ipv6/addrconf.c:3507
notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93
call_netdevice_notifiers_info net/core/dev.c:1667 [inline]
call_netdevice_notifiers net/core/dev.c:1683 [inline]
rollback_registered_many+0x765/0xba0 net/core/dev.c:7203
unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8285
unregister_netdevice_many net/core/dev.c:8284 [inline]
default_device_exit_batch+0x2d8/0x380 net/core/dev.c:8746
ops_exit_list+0xf9/0x150 net/core/net_namespace.c:145
cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 54 49 89 fc 55 4d 8d 74 24 10 53 89 d3 48 83 ec 48 89 74 24 14 e8 df c4 3e fa 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 a5 0c 00 00 48 b8 00 00 00 00 00 fc ff df 49
RIP: send_hsr_supervision_frame+0x32/0xf00 net/hsr/hsr_device.c:263 RSP: ffff8880ba407ca0
---[ end trace 3d8bae1b3378738d ]---


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

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