syzbot


WARNING in inet6_rt_notify

Status: closed as invalid on 2025/07/31 08:04
Subsystems: net
[Documentation on labels]
First crash: 30d, last: 30d
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 WARNING in inet6_rt_notify -1 2 1204d 1222d 0/1 auto-obsoleted due to no activity on 2022/09/02 02:28
Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/07/25 12:45 14m edumazet@google.com patch upstream report log
2025/07/24 11:16 14m edumazet@google.com patch upstream report log
2025/07/23 14:33 14m edumazet@google.com patch upstream report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 3 PID: 7876 at net/ipv6/route.c:6342 inet6_rt_notify+0x475/0x4b0 net/ipv6/route.c:6342
Modules linked in:
CPU: 3 UID: 0 PID: 7876 Comm: syz.0.603 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:inet6_rt_notify+0x475/0x4b0 net/ipv6/route.c:6342
Code: fc ff ff e8 6d 52 ea f7 e9 47 fc ff ff 48 8b 7c 24 08 4c 89 04 24 e8 5a 52 ea f7 4c 8b 04 24 e9 94 fd ff ff e8 9c fe 84 f7 90 <0f> 0b 90 e9 bd fd ff ff e8 6e 52 ea f7 e9 bb fb ff ff 48 89 df e8
RSP: 0018:ffffc9000c5671d8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc9000c567540 RCX: ffffffff8a36e790
RDX: ffff888028dda440 RSI: ffffffff8a36e9d4 RDI: 0000000000000005
RBP: ffff888025191180 R08: 0000000000000005 R09: 00000000ffffffa6
R10: 00000000ffffffa6 R11: 0000000000000001 R12: 00000000ffffffa6
R13: 0000000000000900 R14: ffff88802e0f0000 R15: 0000000000000000
FS:  00007febf385e6c0(0000) GS:ffff8880d6a20000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007febf385df98 CR3: 000000005480a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ip6_route_mpath_notify+0xde/0x280 net/ipv6/route.c:5356
 ip6_route_multipath_add+0x1181/0x1bd0 net/ipv6/route.c:5536
 inet6_rtm_newroute+0xe4/0x1a0 net/ipv6/route.c:5647
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6944
 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x58d/0x850 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
 __sys_sendmmsg+0x200/0x420 net/socket.c:2709
 __do_sys_sendmmsg net/socket.c:2736 [inline]
 __se_sys_sendmmsg net/socket.c:2733 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2733
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febf298e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007febf385e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007febf2bb6080 RCX: 00007febf298e9a9
RDX: 04000000000001f2 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007febf2a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000fc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007febf2bb6080 R15: 00007ffd01e582c8
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/22 11:11 upstream 89be9a83ccf1 1555463b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in inet6_rt_notify
2025/07/22 10:30 upstream 89be9a83ccf1 1555463b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in inet6_rt_notify
2025/07/22 09:58 upstream 89be9a83ccf1 1555463b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in inet6_rt_notify
* Struck through repros no longer work on HEAD.