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Message-ID: <6816e34e.a70a0220.254cdc.002c.GAE@google.com> Date: Sat, 03 May 2025 20:47:26 -0700 From: syzbot <syzbot+0903f6d7f285e41cdf10@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] WARNING in __bpf_prog_ret0_warn Hello, syzbot found the following issue on: HEAD commit: 8bac8898fe39 Merge tag 'mmc-v6.15-rc1' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10f03774580000 kernel config: https://syzkaller.appspot.com/x/.config?x=541aa584278da96c dashboard link: https://syzkaller.appspot.com/bug?extid=0903f6d7f285e41cdf10 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1550ca70580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d10f74580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-8bac8898.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5f7c2d7e1cd1/vmlinux-8bac8898.xz kernel image: https://storage.googleapis.com/syzbot-assets/77a157d2769a/bzImage-8bac8898.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0903f6d7f285e41cdf10@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 3 PID: 217 at kernel/bpf/core.c:2357 __bpf_prog_ret0_warn+0xa/0x20 kernel/bpf/core.c:2357 Modules linked in: CPU: 3 UID: 0 PID: 217 Comm: kworker/u32:6 Not tainted 6.15.0-rc4-syzkaller-00040-g8bac8898fe39 #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:__bpf_prog_ret0_warn+0xa/0x20 kernel/bpf/core.c:2357 Code: f3 0f 1e fa e8 a7 c7 f0 ff 31 c0 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa e8 87 c7 f0 ff 90 <0f> 0b 90 31 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 RSP: 0018:ffffc900031f6c18 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000006e000 RCX: 1ffff9200000dc06 RDX: ffff8880234ba440 RSI: ffffffff81ca6979 RDI: ffff888031e93040 RBP: ffffc900031f6cb8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802b61e010 R13: ffff888031e93040 R14: 00000000000000a0 R15: ffff88802c3d4800 FS: 0000000000000000(0000) GS:ffff8880d6ce2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557b6d2ca8 CR3: 000000002473e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] cls_bpf_classify+0x74a/0x1110 net/sched/cls_bpf.c:105 tc_classify include/net/tc_wrapper.h:197 [inline] __tcf_classify net/sched/cls_api.c:1764 [inline] tcf_classify+0x7ef/0x1380 net/sched/cls_api.c:1860 htb_classify net/sched/sch_htb.c:245 [inline] htb_enqueue+0x2f6/0x12d0 net/sched/sch_htb.c:624 dev_qdisc_enqueue net/core/dev.c:3984 [inline] __dev_xmit_skb net/core/dev.c:4080 [inline] __dev_queue_xmit+0x2142/0x43e0 net/core/dev.c:4595 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xc38/0x21a0 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:313 [inline] __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:295 ip_finish_output+0x35/0x380 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:459 [inline] ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:129 iptunnel_xmit+0x5d5/0xa00 net/ipv4/ip_tunnel_core.c:82 geneve_xmit_skb drivers/net/geneve.c:921 [inline] geneve_xmit+0x2bc5/0x5610 drivers/net/geneve.c:1046 __netdev_start_xmit include/linux/netdevice.h:5203 [inline] netdev_start_xmit include/linux/netdevice.h:5212 [inline] xmit_one net/core/dev.c:3776 [inline] dev_hard_start_xmit+0x93/0x740 net/core/dev.c:3792 __dev_queue_xmit+0x7eb/0x43e0 net/core/dev.c:4629 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0xe98/0x2020 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:215 [inline] ip6_finish_output+0x3f9/0x1360 net/ipv6/ip6_output.c:226 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x1f9/0x540 net/ipv6/ip6_output.c:247 dst_output include/net/dst.h:459 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] mld_sendpack+0x9e9/0x1220 net/ipv6/mcast.c:1868 mld_send_initial_cr.part.0+0x1a1/0x260 net/ipv6/mcast.c:2285 mld_send_initial_cr include/linux/refcount.h:291 [inline] ipv6_mc_dad_complete+0x22c/0x2b0 net/ipv6/mcast.c:2293 addrconf_dad_completed+0xd8a/0x10d0 net/ipv6/addrconf.c:4341 addrconf_dad_work+0x84d/0x14e0 net/ipv6/addrconf.c:4269 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> --- 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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