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general protection fault in find_match (6)

Status: upstream: reported C repro on 2025/09/16 17:56
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+6596516dd2b635ba2350@syzkaller.appspotmail.com
First crash: 213d, last: 4d03h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] general protection fault in find_match (6) 0 (1) 2025/09/16 17:56
▶ ▼ Similar bugs (12)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in find_match net 2 C done error 10 2040d 2226d 0/29 closed as invalid on 2020/04/17 19:54
upstream general protection fault in find_match (3) net 2 2 1071d 1114d 0/29 auto-obsoleted due to no activity on 2023/01/16 14:40
android-6-1 general protection fault in find_match 2 4 38d 127d 0/2 premoderation: reported on 2025/05/12 10:56
upstream general protection fault in find_match (4) net 2 1 755d 751d 0/29 auto-obsoleted due to no activity on 2023/11/20 22:29
upstream general protection fault in find_match (2) net 2 4 1663d 1729d 0/29 auto-closed as invalid on 2021/06/26 04:02
linux-5.15 BUG: unable to handle kernel paging request in find_match 8 5 116d 171d 0/3 auto-obsoleted due to no activity on 2025/08/31 04:44
android-5-15 general protection fault in find_match 2 7 64d 161d 0/2 premoderation: reported on 2025/04/08 10:01
upstream general protection fault in find_match (5) net 2 2 463d 464d 26/29 fixed on 2024/07/10 10:07
linux-4.19 general protection fault in find_match 2 C error 1 1457d 2155d 0/1 upstream: reported C repro on 2019/10/23 12:46
linux-5.15 general protection fault in find_match 2 2 4d19h 9d06h 0/3 upstream: reported on 2025/09/07 13:45
android-5-10 general protection fault in find_match 2 47 10d 165d 0/2 premoderation: reported on 2025/04/04 19:16
linux-6.1 BUG: unable to handle kernel paging request in find_match 8 19 11d 110d 0/3 upstream: reported on 2025/05/28 21:21
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/09/12 16:36 14m retest repro upstream report log
2025/08/24 12:31 15m retest repro upstream report log
2025/08/24 12:31 15m retest repro upstream report log
2025/07/04 16:04 15m retest repro upstream report log
2025/04/20 05:26 15m retest repro upstream report log

Sample crash report:
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)

Crashes (100):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/17 17:38 upstream e2291551827f 0ea0ca3f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root general protection fault in find_match
2025/04/06 01:25 upstream 56f944529ec2 1c65791e .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/07/27 05:28 upstream 302f88ff3584 fb8f743d .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root general protection fault in find_match
2025/05/17 18:51 upstream 172a9d94339c f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in find_match
2025/05/10 22:07 upstream 345030986df8 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/07 17:58 upstream 707df3375124 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/06 01:55 upstream 01f95500a162 ae98e6b9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/04 13:26 upstream e8ab83e34bdc b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/04 00:06 upstream 2a239ffbebb5 b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/03 07:59 upstream 2bfcee565c3a b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/05/01 14:02 upstream 4f79eaa2ceac 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/04/30 02:12 upstream 8bac8898fe39 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in find_match
2025/04/29 07:54 upstream ca91b9500108 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/04/28 18:36 upstream f15d97df5afa c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/04/28 02:48 upstream b4432656b36e c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/04/27 10:54 upstream 5bc1018675ec c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/04/26 21:32 upstream d22aad29de2a c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/04/24 10:04 upstream a79be02bba5c 9c80ffa0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in find_match
2025/06/09 00:49 upstream 19272b37aa4f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/05/14 06:32 upstream 9f35e33144ae 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/05/13 10:46 upstream e9565e23cd89 f6671af7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/05/12 01:56 upstream 82f2b0b97b36 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/05/09 14:25 upstream 9c69f8884904 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/05/02 17:18 upstream ebd297a2affa b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/04/30 01:01 upstream 8bac8898fe39 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in find_match
2025/08/28 14:10 upstream 07d9df80082b bee60a83 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/08/10 12:09 upstream 561c80369df0 32a0e5ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/08/10 01:34 upstream c30a13538d9f 32a0e5ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/08/05 14:05 upstream 7e161a991ea7 37880f40 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/07/25 23:48 upstream 2942242dde89 fb8f743d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/07/17 15:42 upstream e2291551827f 0ea0ca3f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/06/12 22:06 upstream 2c4a1f3fe03e 98683f8f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/06/09 21:51 upstream 19272b37aa4f 4826c28e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/06/02 08:12 upstream cd2e103d57e5 3d2f584d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/05/28 09:34 upstream c89756bcf406 874a1386 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/05/03 12:43 upstream 95d3481af6dc b0714e37 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in find_match
2025/03/28 15:40 upstream acb4f33713b9 9a1a9e31 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in find_match
2025/05/03 11:11 upstream 95d3481af6dc b0714e37 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/30 14:32 upstream b6ea1680d0ac 937aafd7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/29 13:24 upstream ca91b9500108 4a62c0b1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/28 00:23 upstream b4432656b36e c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/28 00:22 upstream b4432656b36e c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/26 11:38 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/25 22:10 upstream c3137514f1f1 c6b4fb39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/24 18:16 upstream e72e9e693307 9c80ffa0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/24 18:15 upstream e72e9e693307 9c80ffa0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/04/24 09:34 upstream a79be02bba5c 9c80ffa0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in find_match
2025/03/28 15:25 net-next 1a9239bb4253 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in find_match
2025/02/20 13:15 upstream 87a132e73910 50668798 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in find_match
2025/06/20 15:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e e3003213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/17 11:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/07 06:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/05 06:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/04 16:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e fd5e6e61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/25 13:08 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/25 06:19 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/23 03:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/20 19:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 187899f4124a 8f9cf946 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/16 00:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/15 11:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/03 19:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e0f4c8dd9d2d b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/02 14:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e0f4c8dd9d2d 2bfec9c0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in find_match
* Struck through repros no longer work on HEAD.