Hello,

syzbot found the following crash on:

HEAD commit: f7571657 Merge tag 'fuse-fixes-5.6-rc1' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12dddbbee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f1d914a74bd6ddc dashboard link: https://syzkaller.appspot.com/bug?extid=ac36b6a33c28a491e929 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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+ac36b6a33c28a491e929@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 465 Comm: kworker/u4:5 Not tainted 5.5.0-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:814 [inline] RIP: 0010:batadv_iv_ogm_schedule+0x220/0xf00 net/batman-adv/bat_iv_ogm.c:865 Code: e8 35 ef bf f9 4c 89 ad 60 ff ff ff 4d 8b 75 00 66 41 c1 c7 08 49 8d 5e 16 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 8a 04 28 84 c0 0f 85 e0 0b 00 00 66 44 89 3b 4c 89 a5 78 ff ff RSP: 0018:ffffc90002887b78 EFLAGS: 00010203 RAX: 0000000000000002 RBX: 0000000000000016 RCX: 1ffff11012580611 RDX: 0000000000000000 RSI: ffff8880a80449b0 RDI: 0000000000000282 RBP: ffffc90002887c38 R08: dffffc0000000000 R09: fffffbfff12d3605 R10: fffffbfff12d3605 R11: 0000000000000000 R12: ffff888092c03000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000075bfd4 CR3: 0000000090ab0000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: batadv_iv_send_outstanding_bat_ogm_packet+0x664/0x770 net/batman-adv/bat_iv_ogm.c:1718 process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace eddf69e5e4c9f596 ]--- RIP: 0010:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:814 [inline] RIP: 0010:batadv_iv_ogm_schedule+0x220/0xf00 net/batman-adv/bat_iv_ogm.c:865 Code: e8 35 ef bf f9 4c 89 ad 60 ff ff ff 4d 8b 75 00 66 41 c1 c7 08 49 8d 5e 16 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 8a 04 28 84 c0 0f 85 e0 0b 00 00 66 44 89 3b 4c 89 a5 78 ff ff RSP: 0018:ffffc90002887b78 EFLAGS: 00010203 RAX: 0000000000000002 RBX: 0000000000000016 RCX: 1ffff11012580611 RDX: 0000000000000000 RSI: ffff8880a80449b0 RDI: 0000000000000282 RBP: ffffc90002887c38 R08: dffffc0000000000 R09: fffffbfff12d3605 R10: fffffbfff12d3605 R11: 0000000000000000 R12: ffff888092c03000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000075bfd4 CR3: 000000009c67b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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