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with SMTP id 5614622812f47-4a2020091cbmr8558875b6e.16.1783669605777; Fri, 10 Jul 2026 00:46:45 -0700 (PDT) Date: Fri, 10 Jul 2026 00:46:45 -0700 In-Reply-To: <20260708205404.911832-1-anzaki@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a50a365.c76b52dc.2a15e.000a.GAE@google.com> Subject: [syzbot ci] Re: netfilter: flowtable: tear down HW offloaded flows on FIB route changes From: syzbot ci To: anzaki@gmail.com, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.org, kuba@kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] netfilter: flowtable: tear down HW offloaded flows on FIB route changes https://lore.kernel.org/all/20260708205404.911832-1-anzaki@gmail.com * [PATCH nf] netfilter: flowtable: tear down HW offloaded flows on FIB route changes and found the following issue: general protection fault in net_generic Full report is available here: https://ci.syzbot.org/series/75cd5a68-8e8e-41ef-9da6-dea3554407a7 *** general protection fault in net_generic tree: nf URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netfilter/nf.git base: 60444706aa17616efc03190d099ac347e28b3d0a arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/b941607c-6459-4d25-8127-6c11f2a37ef0/config syz repro: https://ci.syzbot.org/findings/93de0afd-01d4-4d54-9d3f-13094335f314/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc00000002c8: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x0000000000001640-0x0000000000001647] CPU: 1 UID: 0 PID: 5813 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:net_generic+0xd4/0x240 include/net/netns/generic.h:46 Code: 8c be 4a 03 00 00 48 c7 c2 c0 83 e0 8c e8 14 1b 09 f8 49 bf 00 00 00 00 00 fc ff df 49 81 c6 40 16 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 0d a4 9a f8 4d 8b 26 e8 45 e8 1b RSP: 0018:ffffc90003bde998 EFLAGS: 00010202 RAX: 00000000000002c8 RBX: ffffffff8999417e RCX: ffff8881699c5940 RDX: 0000000000000000 RSI: ffffffff8c2ab760 RDI: ffffffff8c2ab720 RBP: 0000000000000005 R08: ffffffff8999417e R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e959c20 R12: ffff8881b1679870 R13: dffffc0000000000 R14: 0000000000001640 R15: dffffc0000000000 FS: 00007ff6de31c6c0(0000) GS:ffff8882a921d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff6dd272780 CR3: 000000016bc8e000 CR4: 00000000000006f0 Call Trace: fib_seq_sum+0x29/0x280 net/core/fib_notifier.c:43 register_fib_notifier+0x49/0x360 net/core/fib_notifier.c:106 nf_flow_table_init+0x34a/0x460 net/netfilter/nf_flow_table_core.c:888 tcf_ct_flow_table_get+0x13b6/0x1f40 net/sched/act_ct.c:352 tcf_ct_init+0x6bd/0xb10 net/sched/act_ct.c:1423 tcf_action_init_1+0x4ba/0x740 net/sched/act_api.c:1433 tcf_action_init+0x30e/0xb10 net/sched/act_api.c:1508 tcf_action_add net/sched/act_api.c:2106 [inline] tc_ctl_action+0x43b/0xc70 net/sched/act_api.c:2163 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7085 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff6dd39ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff6de31c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff6dd615fa0 RCX: 00007ff6dd39ce59 RDX: 0000000000000040 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007ff6dd432e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff6dd616038 R14: 00007ff6dd615fa0 R15: 00007ffd83f8d058 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:net_generic+0xd4/0x240 include/net/netns/generic.h:46 Code: 8c be 4a 03 00 00 48 c7 c2 c0 83 e0 8c e8 14 1b 09 f8 49 bf 00 00 00 00 00 fc ff df 49 81 c6 40 16 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 0d a4 9a f8 4d 8b 26 e8 45 e8 1b RSP: 0018:ffffc90003bde998 EFLAGS: 00010202 RAX: 00000000000002c8 RBX: ffffffff8999417e RCX: ffff8881699c5940 RDX: 0000000000000000 RSI: ffffffff8c2ab760 RDI: ffffffff8c2ab720 RBP: 0000000000000005 R08: ffffffff8999417e R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e959c20 R12: ffff8881b1679870 R13: dffffc0000000000 R14: 0000000000001640 R15: dffffc0000000000 FS: 00007ff6de31c6c0(0000) GS:ffff8882a921d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff6dd3ea540 CR3: 000000016bc8e000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 8c be 4a 03 00 00 mov %?,0x34a(%rsi) 6: 48 c7 c2 c0 83 e0 8c mov $0xffffffff8ce083c0,%rdx d: e8 14 1b 09 f8 call 0xf8091b26 12: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 19: fc ff df 1c: 49 81 c6 40 16 00 00 add $0x1640,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 0d a4 9a f8 call 0xf89aa446 39: 4d 8b 26 mov (%r14),%r12 3c: e8 .byte 0xe8 3d: 45 rex.RB 3e: e8 .byte 0xe8 3f: 1b .byte 0x1b *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.