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Message-ID: <68c9a4d2.050a0220.3c6139.0e63.GAE@google.com> Date: Tue, 16 Sep 2025 10:56:34 -0700 From: syzbot <syzbot+6596516dd2b635ba2350@...kaller.appspotmail.com> To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] general protection fault in find_match (6) Hello, syzbot found the following issue on: HEAD commit: e2291551827f Merge tag 'probes-fixes-v6.16-rc6' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126aad8c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f62a2ef17395702a dashboard link: https://syzkaller.appspot.com/bug?extid=6596516dd2b635ba2350 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1091958c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c89382580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-e2291551.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8873881d7728/vmlinux-e2291551.xz kernel image: https://storage.googleapis.com/syzbot-assets/c85b06341ad0/bzImage-e2291551.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/6dce6e633409/mount_8.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=17c3e7d4580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6596516dd2b635ba2350@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 0 UID: 0 PID: 3043 Comm: kworker/u4:11 Not tainted 6.16.0-rc6-syzkaller-00037-ge2291551827f #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 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:781 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 cf c4 fc f7 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 ae c4 fc f7 48 8b 1b e8 f6 60 48 RSP: 0018:ffffc9000d5ce430 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000000 RDX: ffff88803f90c880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff1100b37b324 R08: ffffc9000d5ce7c0 R09: ffffc9000d5ce7d0 R10: ffffc9000d5ce620 R11: ffffffff8a26ecd0 R12: dffffc0000000000 R13: 0000000000000002 R14: 1ffff1100b37b326 R15: ffff888059bd9937 FS: 0000000000000000(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd76fadfd8 CR3: 000000000df38000 CR4: 0000000000352ef0 Call Trace: <TASK> rt6_nh_find_match+0xd9/0x150 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x1cd/0x400 net/ipv4/nexthop.c:1516 __find_rr_leaf+0x461/0x6d0 net/ipv6/route.c:862 find_rr_leaf net/ipv6/route.c:890 [inline] rt6_select net/ipv6/route.c:934 [inline] fib6_table_lookup+0x39f/0xa80 net/ipv6/route.c:2232 ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2268 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x348/0x6f0 net/ipv6/fib6_rules.c:125 ip6_route_output_flags_noref net/ipv6/route.c:2683 [inline] ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2695 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x1ae/0x1510 net/ipv6/ip6_output.c:1128 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1259 udp_tunnel6_dst_lookup+0x231/0x3c0 net/ipv6/ip6_udp_tunnel.c:165 geneve6_xmit_skb drivers/net/geneve.c:957 [inline] geneve_xmit+0xd2e/0x2b70 drivers/net/geneve.c:1043 __netdev_start_xmit include/linux/netdevice.h:5215 [inline] netdev_start_xmit include/linux/netdevice.h:5224 [inline] xmit_one net/core/dev.c:3830 [inline] dev_hard_start_xmit+0x2d4/0x830 net/core/dev.c:3846 __dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3355 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:317 mld_sendpack+0x800/0xd80 net/ipv6/mcast.c:1868 ipv6_mc_dad_complete+0x88/0x4b0 net/ipv6/mcast.c:2293 addrconf_dad_completed+0x6d5/0xd60 net/ipv6/addrconf.c:4339 addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:781 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 cf c4 fc f7 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 ae c4 fc f7 48 8b 1b e8 f6 60 48 RSP: 0018:ffffc9000d5ce430 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000000 RDX: ffff88803f90c880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff1100b37b324 R08: ffffc9000d5ce7c0 R09: ffffc9000d5ce7d0 R10: ffffc9000d5ce620 R11: ffffffff8a26ecd0 R12: dffffc0000000000 R13: 0000000000000002 R14: 1ffff1100b37b326 R15: ffff888059bd9937 FS: 0000000000000000(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd76fadfd8 CR3: 000000000df38000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 7 bytes skipped: 0: df 42 80 filds -0x80(%rdx) 3: 7c 25 jl 0x2a 5: 00 00 add %al,(%rax) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 cf c4 fc f7 call 0xf7fcc4e0 11: 48 89 d8 mov %rbx,%rax 14: bb c0 00 00 00 mov $0xc0,%ebx 19: 48 03 18 add (%rax),%rbx 1c: 48 89 d8 mov %rbx,%rax 1f: 48 c1 e8 03 shr $0x3,%rax * 23: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 28: 74 08 je 0x32 2a: 48 89 df mov %rbx,%rdi 2d: e8 ae c4 fc f7 call 0xf7fcc4e0 32: 48 8b 1b mov (%rbx),%rbx 35: e8 .byte 0xe8 36: f6 60 48 mulb 0x48(%rax) --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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