general protection fault in batadv_iv_ogm_schedule_buff (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: b850307b Linux 4.14.184
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11e493b7100000
kernel config: https://syzkaller.appspot.com/x/.config?x=ddc0f08dd6b981c5
dashboard link: https://syzkaller.appspot.com/bug?extid=c38b67b2c7ceaace5670
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+c38b67...@syzkaller.appspotmail.com

Cannot find del_set index 4 as target
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: 13717 Comm: kworker/u4:3 Not tainted 4.14.184-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: ffff888045c3a340 task.stack: ffff8881f4078000
RIP: 0010:batadv_iv_ogm_schedule_buff+0x9c9/0xe90 net/batman-adv/bat_iv_ogm.c:1015
RSP: 0018:ffff8881f407fc40 EFLAGS: 00010202
RAX: 000000000000000e RBX: 0000000000000000 RCX: 1ffff11008b87587
RDX: 0000000000000000 RSI: ffff888045c3ac40 RDI: 0000000000000070
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888095da4030 R14: ffffed1010e8edbe R15: ffff888087476d80
FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 00000000877cb000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1041 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1034 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x500/0x6f0 net/batman-adv/bat_iv_ogm.c:1859
process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 03 80 3c 28 00 0f 85 f8 03 00 00 48 8b 1b 48 81 fb 00 e3 e5 8a 0f 84 33 01 00 00 e8 92 90 37 fb 48 8d 7b 70 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 db 03 00 00 41 80 3e 00 4c 8b 63 70 0f 85 b1
RIP: batadv_iv_ogm_schedule_buff+0x9c9/0xe90 net/batman-adv/bat_iv_ogm.c:1015 RSP: ffff8881f407fc40
---[ end trace 1b7f7d54101bde20 ]---


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[syzbot]

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