general protection fault in batadv_iv_send_outstanding_bat_ogm_packet

[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=14bc7c1de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=8a9d0602a0f7791e
dashboard link: https://syzkaller.appspot.com/bug?extid=1a5393d41dd99722e396
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+1a5393...@syzkaller.appspotmail.com

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: 1 PID: 20339 Comm: kworker/u4:3 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
task: ffff88808165c400 task.stack: ffff8880163c8000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:batadv_iv_send_outstanding_bat_ogm_packet+0x7e/0x6a0 net/batman-adv/bat_iv_ogm.c:1792
RSP: 0018:ffff8880163cfce8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88805836be88 RCX: 0000000000000000
RDX: 0000000000000158 RSI: ffffffff87d842e0 RDI: 0000000000000ac0
RBP: 0000000000000000 R08: 00000000000005a7 R09: ffffffff8a05e5b8
R10: ffff88808165cca8 R11: ffff88808165c400 R12: ffff8880163cfdd8
R13: ffff88805836be40 R14: ffff888080c7ecc0 R15: ffff88805836bf28
FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12fcb25066 CR3: 000000009e823000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
process_one_work+0x813/0x1540 kernel/workqueue.c:2114
worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 94 05 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 6e 68 48 8d bd c0 0a 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8880163cfce8
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8880163cfce8
RIP: batadv_iv_send_outstanding_bat_ogm_packet+0x7e/0x6a0 net/batman-adv/bat_iv_ogm.c:1792 RSP: ffff8880163cfce8
team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): Releasing backup interface bond_slave_1
overlayfs: './file0' not a directory
bond0 (unregistering): Releasing backup interface bond_slave_0
---[ end trace 31f4ac9798730d21 ]---


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[syzbot]

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