Hello, syzbot found the following crash on: HEAD commit: f8788d86 Linux 5.6-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=104263a1e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9833e26bab355358 dashboard link: https://syzkaller.appspot.com/bug?extid=2a2fe383b2ce0e44b6ea 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+2a2fe383b2ce0e44b6ea@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 22524 Comm: kworker/0:10 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:nf_ct_tuplehash_to_ctrack include/net/netfilter/nf_conntrack.h:113 [inline] RIP: 0010:gc_worker+0x3b1/0xdd0 net/netfilter/nf_conntrack_core.c:1390 Code: e8 03 4c 01 f8 85 db 48 89 85 70 ff ff ff 0f 85 53 03 00 00 e8 10 9d 01 fb 49 8d 7e 37 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 38 38 d0 7f 08 84 c0 0f 85 c4 08 00 00 41 0f b6 46 37 RSP: 0018:ffffc9000604fc40 EFLAGS: 00010202 RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffffffff8673ed86 RDX: 0000000000000007 RSI: ffffffff8673ea40 RDI: 0000000000000037 RBP: ffffc9000604fd20 R08: ffff8880a25f23c0 R09: ffffed1000025fb8 R10: ffffed1000025fb7 R11: ffff88800012fdbb R12: ffff88800012fdb8 R13: 0000000000010000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005014d000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 3051a0fdf6c90610 ]--- RIP: 0010:nf_ct_tuplehash_to_ctrack include/net/netfilter/nf_conntrack.h:113 [inline] RIP: 0010:gc_worker+0x3b1/0xdd0 net/netfilter/nf_conntrack_core.c:1390 Code: e8 03 4c 01 f8 85 db 48 89 85 70 ff ff ff 0f 85 53 03 00 00 e8 10 9d 01 fb 49 8d 7e 37 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 38 38 d0 7f 08 84 c0 0f 85 c4 08 00 00 41 0f b6 46 37 RSP: 0018:ffffc9000604fc40 EFLAGS: 00010202 RAX: 0000000000000006 RBX: 0000000000000000 RCX: ffffffff8673ed86 RDX: 0000000000000007 RSI: ffffffff8673ea40 RDI: 0000000000000037 RBP: ffffc9000604fd20 R08: ffff8880a25f23c0 R09: ffffed1000025fb8 R10: ffffed1000025fb7 R11: ffff88800012fdbb R12: ffff88800012fdb8 R13: 0000000000010000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000928000 CR3: 0000000217f1b000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
