Hello, syzbot found the following issue on: HEAD commit: e4cd8d3ff7f9 Add linux-next specific files for 20221121 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1472370d880000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0ebedc6917bacc1 dashboard link: https://syzkaller.appspot.com/bug?extid=bfb2bee01b9c01fff864 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b59eb967701d/disk-e4cd8d3f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/37a7b43e6e84/vmlinux-e4cd8d3f.xz kernel image: https://storage.googleapis.com/syzbot-assets/ebfb0438e6a2/bzImage-e4cd8d3f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bfb2bee01b9c01fff864@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 0 PID: 5295 Comm: kworker/0:3 Not tainted 6.1.0-rc5-next-20221121-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:xfrm_policy_lookup_bytype.cold+0x1c/0x54 net/xfrm/xfrm_policy.c:2139 Code: 80 44 28 8e e8 9a 88 37 fa e9 28 e7 7b fe e8 c0 25 7a f7 49 8d bf cc 00 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1c 41 RSP: 0018:ffffc90003cdf1e0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000019 RSI: ffffffff8a068150 RDI: 00000000000000cc RBP: 0000000000000000 R08: 0000000000000007 R09: fffffffffffff000 R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000 R13: ffff88802ae78000 R14: ffffed10055cf2ff R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb5cb893300 CR3: 00000000714fb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> xfrm_policy_lookup net/xfrm/xfrm_policy.c:2151 [inline] xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2958 [inline] xfrm_lookup_with_ifid+0x39b/0x20f0 net/xfrm/xfrm_policy.c:3099 xfrmi_xmit2 net/xfrm/xfrm_interface.c:404 [inline] xfrmi_xmit+0x3c7/0x1b90 net/xfrm/xfrm_interface.c:521 __netdev_start_xmit include/linux/netdevice.h:4859 [inline] netdev_start_xmit include/linux/netdevice.h:4873 [inline] xmit_one net/core/dev.c:3583 [inline] dev_hard_start_xmit+0x1c2/0x990 net/core/dev.c:3599 __dev_queue_xmit+0x2cdf/0x3ba0 net/core/dev.c:4249 dev_queue_xmit include/linux/netdevice.h:3029 [inline] neigh_connected_output+0x3c4/0x520 net/core/neighbour.c:1600 neigh_output include/net/neighbour.h:546 [inline] ip6_finish_output2+0x56c/0x1530 net/ipv6/ip6_output.c:134 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xa63/0x1740 net/ipv6/ndisc.c:508 ndisc_send_rs+0x132/0x6f0 net/ipv6/ndisc.c:718 addrconf_dad_completed+0x37a/0xda0 net/ipv6/addrconf.c:4248 addrconf_dad_begin net/ipv6/addrconf.c:4014 [inline] addrconf_dad_work+0x820/0x12d0 net/ipv6/addrconf.c:4116 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:xfrm_policy_lookup_bytype.cold+0x1c/0x54 net/xfrm/xfrm_policy.c:2139 Code: 80 44 28 8e e8 9a 88 37 fa e9 28 e7 7b fe e8 c0 25 7a f7 49 8d bf cc 00 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1c 41 RSP: 0018:ffffc90003cdf1e0 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000019 RSI: ffffffff8a068150 RDI: 00000000000000cc RBP: 0000000000000000 R08: 0000000000000007 R09: fffffffffffff000 R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000 R13: ffff88802ae78000 R14: ffffed10055cf2ff R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb5cb893300 CR3: 00000000714fb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 44 28 8e e8 9a 88 37 sub %r9b,0x37889ae8(%rsi) 7: fa cli 8: e9 28 e7 7b fe jmpq 0xfe7be735 d: e8 c0 25 7a f7 callq 0xf77a25d2 12: 49 8d bf cc 00 00 00 lea 0xcc(%r15),%rdi 19: b8 ff ff 37 00 mov $0x37ffff,%eax 1e: 48 89 fa mov %rdi,%rdx 21: 48 c1 e0 2a shl $0x2a,%rax 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2d: 48 89 f8 mov %rdi,%rax 30: 83 e0 07 and $0x7,%eax 33: 83 c0 03 add $0x3,%eax 36: 38 d0 cmp %dl,%al 38: 7c 04 jl 0x3e 3a: 84 d2 test %dl,%dl 3c: 75 1c jne 0x5a 3e: 41 rex.B --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
