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Thu, 05 Feb 2026 17:33:26 -0800 (PST) Date: Thu, 05 Feb 2026 17:33:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698544e6.a00a0220.34fa92.0020.GAE@google.com> Subject: [moderation/CI] Re: net: sched: refactor qdisc drop reasons into dedicated tracepoint From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v2] net: sched: refactor qdisc drop reasons into dedicated tracepoint https://lore.kernel.org/all/177032644012.1975497.16411100029657607833.stgit= @firesoul * [PATCH net-next v2 1/6] net: sched: introduce qdisc-specific drop reason = tracing * [PATCH net-next v2 2/6] net: sched: sfq: convert to qdisc drop reasons * [PATCH net-next v2 3/6] net: sched: sch_cake: use enum qdisc_drop_reason = for cobalt_should_drop * [PATCH net-next v2 4/6] net: sched: rename QDISC_DROP_CAKE_FLOOD to QDISC= _DROP_FLOOD_PROTECTION * [PATCH net-next v2 5/6] net: sched: rename QDISC_DROP_FQ_* to generic nam= es * [PATCH net-next v2 6/6] net: sched: sch_dualpi2: use qdisc_dequeue_drop()= for dequeue drops and found the following issue: WARNING in __dev_queue_xmit Full report is available here: https://ci.syzbot.org/series/51381d54-6fc9-4542-a8cd-eac656a11965 *** WARNING in __dev_queue_xmit tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/= net-next.git base: 7a4cd71fa4514cd85df39b3cf99da8142660cdcd arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp= 1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/17bc5e9e-8ccc-4afb-a291-312bbc43df2= 0/config C repro: https://ci.syzbot.org/findings/20939160-05e8-4589-a6d5-6a253d5e3= 9b0/c_repro syz repro: https://ci.syzbot.org/findings/20939160-05e8-4589-a6d5-6a253d5e3= 9b0/syz_repro syzkaller0: entered promiscuous mode syzkaller0: entered allmulticast mode ------------[ cut here ]------------ reason && reason < __QDISC_DROP_REASON WARNING: net/sched/sch_generic.c:50 at tcf_kfree_skb_list+0xd6/0x100 net/sc= hed/sch_generic.c:50, CPU#0: syz.0.17/5949 Modules linked in: CPU: 0 UID: 0 PID: 5949 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:tcf_kfree_skb_list+0xd6/0x100 net/sched/sch_generic.c:50 Code: 89 e8 e8 5d 00 00 00 31 ff 4c 89 e6 ba 40 00 00 00 e8 be e6 d6 ff 4c = 8b 24 24 4d 85 e4 74 27 e9 6e ff ff ff e8 1b f3 50 f8 90 <0f> 0b 90 eb c4 4= 4 89 e9 80 e1 07 80 c1 03 38 c1 7c 96 4c 89 ef e8 RSP: 0018:ffffc90003e67360 EFLAGS: 00010293 RAX: ffffffff89718645 RBX: ffff8881133cc000 RCX: ffff8881738b9d40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000002ffff RBP: 0000000000000001 R08: ffff88811571195b R09: 1ffff11022ae232b R10: dffffc0000000000 R11: ffffed1022ae232c R12: ffff88810a9bca80 R13: 0000000000000002 R14: ffff888109569400 R15: ffff888115711800 FS: 000055558d217500(0000) GS:ffff88818e31a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001410 CR3: 0000000166b9c000 CR4: 00000000000006f0 Call Trace: __dev_xmit_skb net/core/dev.c:4272 [inline] __dev_queue_xmit+0x18e5/0x3180 net/core/dev.c:4797 packet_snd net/packet/af_packet.c:3077 [inline] packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3109 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x4d7/0x810 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6544b9acb9 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 f= f 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc871586c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6544e15fa0 RCX: 00007f6544b9acb9 RDX: 0000000000000004 RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007f6544c08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6544e15fac R14: 00007f6544e15fa0 R15: 00007f6544e15fa0 *** 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. The email will later be sent to: [atenart@redhat.com bpf@vger.kernel.org carges@cloudflare.com davem@davemlo= ft.net edumazet@google.com eric.dumazet@gmail.com hawk@kernel.org horms@ker= nel.org jhs@mojatatu.com jiri@resnulli.us kernel-team@cloudflare.com kuba@k= ernel.org netdev@vger.kernel.org pabeni@redhat.com toke@toke.dk xiyou.wangc= ong@gmail.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid