Hello,

syzbot found the following crash on:

HEAD commit: eed9688f8513 Merge branch 'ras-core-for-linus' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10785d57400000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa5c63e12fd85b25 dashboard link: https://syzkaller.appspot.com/bug?extid=050927a651272b145a5d compiler: gcc (GCC) 8.0.1 20180413 (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+050927a651272b145a5d@syzkaller.appspotmail.com

QAT: Invalid ioctl bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves WARNING: CPU: 0 PID: 28 at net/batman-adv/multicast.c:371 batadv_mcast_mla_tt_add net/batman-adv/multicast.c:371 [inline] WARNING: CPU: 0 PID: 28 at net/batman-adv/multicast.c:371 __batadv_mcast_mla_update net/batman-adv/multicast.c:636 [inline] WARNING: CPU: 0 PID: 28 at net/batman-adv/multicast.c:371 batadv_mcast_mla_update+0x248f/0x2da0 net/batman-adv/multicast.c:661 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 28 Comm: kworker/u4:2 Not tainted 4.20.0+ #390 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_mcast_mla_update Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:batadv_mcast_mla_tt_add net/batman-adv/multicast.c:371 [inline] RIP: 0010:__batadv_mcast_mla_update net/batman-adv/multicast.c:636 [inline] RIP: 0010:batadv_mcast_mla_update+0x248f/0x2da0 net/batman-adv/multicast.c:661 Code: 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df be f8 f8 ff ff 66 41 89 34 06 48 c1 ea 03 c6 04 02 f8 e9 f7 e7 ff ff e8 41 f3 bf f9 <0f> 0b e9 b8 e3 ff ff 48 8b bd 48 fc ff ff e8 1e fe 02 fa e9 99 df RSP: 0018:ffff8880a9fe7338 EFLAGS: 00010293 RAX: ffff8880a9422000 RBX: 0000000000000001 RCX: ffffffff87bf0125 RDX: 0000000000000000 RSI: ffffffff87bf1d6f RDI: 0000000000000007 RBP: ffff8880a9fe7738 R08: ffff8880a9422000 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8880a9422000 R12: ffff8880a9fe7490 R13: 0000000000000000 R14: 1ffff110153fce92 R15: ffff8880a9fe7710 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..

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