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Message-ID: <686764a5.a00a0220.c7b3.0013.GAE@google.com> Date: Thu, 03 Jul 2025 22:20:37 -0700 From: syzbot <syzbot+1261670bbdefc5485a06@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com Subject: [syzbot] [net?] general protection fault in qdisc_tree_reduce_backlog Hello, syzbot found the following issue on: HEAD commit: bd475eeaaf3c Merge branch '200GbE' of git://git.kernel.org.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f0b3d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=36b0e72cad5298f8 dashboard link: https://syzkaller.appspot.com/bug?extid=1261670bbdefc5485a06 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164d8c8c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14839ebc580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d59bc82a55e0/disk-bd475eea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2a83759fceb6/vmlinux-bd475eea.xz kernel image: https://storage.googleapis.com/syzbot-assets/07576fd8e432/bzImage-bd475eea.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1261670bbdefc5485a06@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 UID: 0 PID: 5835 Comm: syz-executor374 Not tainted 6.16.0-rc3-syzkaller-00144-gbd475eeaaf3c #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:qdisc_tree_reduce_backlog+0x223/0x480 net/sched/sch_api.c:806 Code: 89 ef e8 40 80 b3 f8 4d 89 ef 85 db 74 0d e8 74 fc 4f f8 4c 89 f5 e9 88 00 00 00 48 8b 6d 00 48 8d 45 20 48 89 c3 48 c1 eb 03 <42> 80 3c 33 00 48 89 04 24 74 0d 48 8b 3c 24 e8 09 80 b3 f8 48 8b RSP: 0018:ffffc900040bf0a8 EFLAGS: 00010202 RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000000 RDX: ffff888031da3c00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888031da3c00 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000000afff2 R13: ffff88802875a000 R14: dffffc0000000000 R15: ffff88802875a000 FS: 000055555b6b1380(0000) GS:ffff888125c50000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000240 CR3: 00000000726c2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> fq_codel_change+0xa96/0xef0 net/sched/sch_fq_codel.c:450 fq_codel_init+0x355/0x960 net/sched/sch_fq_codel.c:487 qdisc_create+0x7ac/0xea0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x1426/0x2010 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x779/0xb70 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f79d710a6a9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2ee70668 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff2ee70838 RCX: 00007f79d710a6a9 RDX: 0000000000000800 RSI: 0000200000000100 RDI: 0000000000000003 RBP: 00007f79d717d610 R08: 0000000000000004 R09: 00007fff2ee70838 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff2ee70828 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:qdisc_tree_reduce_backlog+0x223/0x480 net/sched/sch_api.c:806 Code: 89 ef e8 40 80 b3 f8 4d 89 ef 85 db 74 0d e8 74 fc 4f f8 4c 89 f5 e9 88 00 00 00 48 8b 6d 00 48 8d 45 20 48 89 c3 48 c1 eb 03 <42> 80 3c 33 00 48 89 04 24 74 0d 48 8b 3c 24 e8 09 80 b3 f8 48 8b RSP: 0018:ffffc900040bf0a8 EFLAGS: 00010202 RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000000 RDX: ffff888031da3c00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888031da3c00 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000000afff2 R13: ffff88802875a000 R14: dffffc0000000000 R15: ffff88802875a000 FS: 000055555b6b1380(0000) GS:ffff888125c50000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000240 CR3: 00000000726c2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 ef mov %ebp,%edi 2: e8 40 80 b3 f8 call 0xf8b38047 7: 4d 89 ef mov %r13,%r15 a: 85 db test %ebx,%ebx c: 74 0d je 0x1b e: e8 74 fc 4f f8 call 0xf84ffc87 13: 4c 89 f5 mov %r14,%rbp 16: e9 88 00 00 00 jmp 0xa3 1b: 48 8b 6d 00 mov 0x0(%rbp),%rbp 1f: 48 8d 45 20 lea 0x20(%rbp),%rax 23: 48 89 c3 mov %rax,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) <-- trapping instruction 2f: 48 89 04 24 mov %rax,(%rsp) 33: 74 0d je 0x42 35: 48 8b 3c 24 mov (%rsp),%rdi 39: e8 09 80 b3 f8 call 0xf8b38047 3e: 48 rex.W 3f: 8b .byte 0x8b --- 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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