general protection fault in send_hsr_supervision_frame

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 12cd844a Linux 4.14.173
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15993ffde00000
kernel config: https://syzkaller.appspot.com/x/.config?x=8a9d0602a0f7791e
dashboard link: https://syzkaller.appspot.com/bug?extid=0df38e0acc76f2f5e24d
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+0df38e...@syzkaller.appspotmail.com

audit: type=1804 audit(1584292405.947:158): pid=19996 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir029205568/syzkaller.S0w3K6/484/bus" dev="sda1" ino=16762 res=1
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: 7390 Comm: syz-fuzzer Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809958e180 task.stack: ffff888084128000
RIP: 0010:send_hsr_supervision_frame+0x32/0xf40 net/hsr/hsr_device.c:263
RSP: 0000:ffff8880aea07cd0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff0f417ac
RDX: 0000000000000002 RSI: 0000000000000017 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000022012
R10: ffff88809958ea28 R11: ffff88809958e180 R12: 0000000000000000
R13: ffff888052872f20 R14: 0000000000000010 R15: 0000000000000000
FS: 000000c4201d1890(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32429000 CR3: 000000009b7b8000 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: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
</IRQ>
RIP: 0033:0x41cc54
RSP: 002b:000000c420335f38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 000000c420084900 RBX: 0000000000000015 RCX: 000000c42002b270
RDX: 0000000000000000 RSI: 00000000009bf988 RDI: 0000000000004688
RBP: 000000c420335f80 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000020 R11: 000000c42ad70360 R12: 000000c449784750
R13: 0000000000000001 R14: 000000c43f2fbf20 R15: 0000000000000001
Code: 54 49 89 fc 55 4d 8d 74 24 10 53 89 d3 48 83 ec 48 89 74 24 14 e8 6f 4e 22 fb 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 db 0c 00 00 48 b8 00 00 00 00 00 fc ff df 49
RIP: send_hsr_supervision_frame+0x32/0xf40 net/hsr/hsr_device.c:263 RSP: ffff8880aea07cd0
---[ end trace af17bd91f4843892 ]---


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[syzbot]

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