syzbot


WARNING in __skb_flow_dissect (7)

Status: upstream: reported on 2026/01/20 16:15
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+c46409299c70a221415e@syzkaller.appspotmail.com
First crash: 76d, last: 8d09h
Discussions (2)
Title Replies (including bot) Last reply
[PATCH net] bonding: provide a net pointer to __skb_flow_dissect() 2 (2) 2026/01/20 20:01
[syzbot] [net?] WARNING in __skb_flow_dissect (7) 0 (1) 2026/01/20 16:15
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __skb_flow_dissect (6) net -1 1 624d 624d 27/29 fixed on 2024/08/14 19:57
linux-6.1 WARNING in __skb_flow_dissect -1 5 10h37m 4d13h 0/3 upstream: reported on 2026/01/17 07:47
upstream WARNING in __skb_flow_dissect net -1 syz 3 2660d 2661d 11/29 fixed on 2018/10/11 18:37
upstream WARNING in __skb_flow_dissect (5) net -1 1 664d 664d 0/29 closed as invalid on 2024/04/26 11:59
upstream WARNING in __skb_flow_dissect (3) net -1 syz 224 2563d 2652d 11/29 fixed on 2019/03/06 07:43
upstream WARNING in __skb_flow_dissect (4) net -1 C error 6 1173d 1182d 22/29 fixed on 2023/02/24 13:50

Sample crash report:
------------[ cut here ]------------
WARNING: net/core/flow_dissector.c:1131 at __skb_flow_dissect+0xb57/0x68b0 net/core/flow_dissector.c:1131, CPU#1: syz.2.1418/11053
Modules linked in:
CPU: 1 UID: 0 PID: 11053 Comm: syz.2.1418 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__skb_flow_dissect+0xb57/0x68b0 net/core/flow_dissector.c:1131
Code: 55 00 00 80 3d 94 c5 36 06 01 0f 85 b3 55 00 00 e8 be 8d 8b f8 e9 83 f9 ff ff e8 b4 8d 8b f8 e9 b0 03 00 00 e8 aa 8d 8b f8 90 <0f> 0b 90 e9 16 ff ff ff e8 9c 8d 8b f8 c6 05 5d c5 36 06 01 48 c7
RSP: 0000:ffffc900033a7100 EFLAGS: 00010287
RAX: ffffffff8935c70e RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9000d75c000 RSI: 0000000000000539 RDI: 000000000000053a
RBP: ffffc900033a7718 R08: ffffffff893562c8 R09: ffffffff8df41aa0
R10: ffffc900033a77a0 R11: fffff52000674efe R12: dffffc0000000000
R13: ffffffff893562c8 R14: 0000000000000000 R15: ffffffff8f825fd0
FS:  00007fea4dbe96c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c38c723 CR3: 00000000294c6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 bond_flow_dissect drivers/net/bonding/bond_main.c:4093 [inline]
 __bond_xmit_hash+0x2d7/0xba0 drivers/net/bonding/bond_main.c:4157
 bond_xmit_hash_xdp drivers/net/bonding/bond_main.c:4208 [inline]
 bond_xdp_xmit_3ad_xor_slave_get drivers/net/bonding/bond_main.c:5139 [inline]
 bond_xdp_get_xmit_slave+0x1fd/0x710 drivers/net/bonding/bond_main.c:5515
 xdp_master_redirect+0x13f/0x2c0 net/core/filter.c:4388
 bpf_prog_run_xdp include/net/xdp.h:700 [inline]
 bpf_test_run+0x6b2/0x7d0 net/bpf/test_run.c:421
 bpf_prog_test_run_xdp+0x795/0x10e0 net/bpf/test_run.c:1390
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4703
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6182
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea4cd8f749
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:00007fea4dbe9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fea4cfe5fa0 RCX: 00007fea4cd8f749
RDX: 0000000000000059 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007fea4ce13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea4cfe6038 R14: 00007fea4cfe5fa0 R15: 00007ffdb8efbed8
 </TASK>

Crashes (275):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/13 12:10 net dfdf77465620 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/13 09:36 net dfdf77465620 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/13 07:40 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/13 06:40 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/13 05:16 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/13 03:34 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 23:22 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 21:32 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 20:25 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 19:15 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 18:29 net f93fc5d12d69 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 17:25 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 14:14 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 11:56 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 10:17 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 09:16 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 07:37 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 05:06 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 03:52 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 02:50 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 01:46 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/12 00:20 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 22:08 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 20:15 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 17:07 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 15:52 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 14:24 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 12:37 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 11:49 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 10:49 net 16ce6e6fa946 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 09:35 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 08:32 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 07:05 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 04:18 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/11 02:59 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 21:28 net cac2c363c41c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 18:57 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 15:18 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 13:38 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 12:29 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 09:55 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 08:02 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 06:05 net 7470a7a63dc1 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/10 01:50 net 872ac785e768 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2026/01/09 23:37 net 872ac785e768 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
2025/12/31 09:26 net 1adaea51c61b d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __skb_flow_dissect
* Struck through repros no longer work on HEAD.