Hello,

syzbot found the following issue on:

HEAD commit: 34d4ddd3 Merge tag 'linux-kselftest-5.9-rc5' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13db7cdd900000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f5c353182ed6199 dashboard link: https://syzkaller.appspot.com/bug?extid=870c4745cc7a955e17e2 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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+870c4745cc7a955e17e2@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 PID: 6396 Comm: kworker/u4:8 Not tainted 5.9.0-rc4-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 RIP: 0010:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:843 [inline] RIP: 0010:batadv_iv_ogm_schedule+0x925/0xf40 net/batman-adv/bat_iv_ogm.c:869 Code: 00 48 c1 e8 03 48 89 44 24 28 48 c7 c5 48 e7 3a 8c 0f 1f 40 00 49 8d 5f 70 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 7d e0 a9 f9 48 8b 1b 48 b8 00 00 00 RSP: 0018:ffffc90019cd7b88 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000000 RBP: ffffffff8c3ae748 R08: ffffffff880ae416 R09: ffffed10152b4c06 R10: ffffed10152b4c06 R11: 0000000000000000 R12: 0000000000000007 R13: ffff8880a95a6028 R14: ffff8880a7f17870 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000931c4000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: batadv_iv_send_outstanding_bat_ogm_packet+0x68c/0x7c0 net/batman-adv/bat_iv_ogm.c:1723 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace 3bb6c6ec8627e29b ]--- RIP: 0010:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:843 [inline] RIP: 0010:batadv_iv_ogm_schedule+0x925/0xf40 net/batman-adv/bat_iv_ogm.c:869 Code: 00 48 c1 e8 03 48 89 44 24 28 48 c7 c5 48 e7 3a 8c 0f 1f 40 00 49 8d 5f 70 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 7d e0 a9 f9 48 8b 1b 48 b8 00 00 00 RSP: 0018:ffffc90019cd7b88 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000000 RBP: ffffffff8c3ae748 R08: ffffffff880ae416 R09: ffffed10152b4c06 R10: ffffed10152b4c06 R11: 0000000000000000 R12: 0000000000000007 R13: ffff8880a95a6028 R14: ffff8880a7f17870 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000931c4000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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