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Message-ID: <686764a5.a00a0220.c7b3.0014.GAE@google.com> Date: Thu, 03 Jul 2025 22:20:37 -0700 From: syzbot <syzbot+15b96fc3aac35468fe77@...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 drr_qlen_notify Hello, syzbot found the following issue on: HEAD commit: 17bbde2e1716 Merge tag 'net-6.16-rc5' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1533f770580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8b0724e6945b4773 dashboard link: https://syzkaller.appspot.com/bug?extid=15b96fc3aac35468fe77 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14044c8c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14840c8c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/62107140ac32/disk-17bbde2e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/72e5df2d1649/vmlinux-17bbde2e.xz kernel image: https://storage.googleapis.com/syzbot-assets/e906bf8ebf5c/bzImage-17bbde2e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+15b96fc3aac35468fe77@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 1 UID: 0 PID: 5817 Comm: syz-executor457 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__list_del_entry_valid_or_report+0x20/0x200 lib/list_debug.c:49 Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 54 55 53 48 89 fb 48 83 c7 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 01 00 00 48 89 da 48 8b 6b 08 48 b8 00 00 00 RSP: 0018:ffffc9000410f2e8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000050 RCX: 1ffff1100f97af5c RDX: 000000000000000b RSI: ffffffff898bef4c RDI: 0000000000000058 RBP: 0000000000000050 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000000a0000 R11: 0000000000000001 R12: ffffffff8ce802e0 R13: 0000000000000058 R14: ffffffff8ce802c0 R15: ffff88807cbd7800 FS: 000055557a6d4380(0000) GS:ffff888124852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001fc0 CR3: 00000000721d4000 CR4: 00000000003526f0 Call Trace: <TASK> __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] drr_qlen_notify+0x24/0x150 net/sched/sch_drr.c:238 qdisc_tree_reduce_backlog+0x221/0x500 net/sched/sch_api.c:811 pie_change+0x86e/0xe70 net/sched/sch_pie.c:204 pie_init+0x364/0x470 net/sched/sch_pie.c:456 qdisc_create+0x454/0xfc0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x12bb/0x2130 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x3c6/0xe90 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9cedcdb669 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:00007ffd67f881b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffd67f88388 RCX: 00007f9cedcdb669 RDX: 0000000000004000 RSI: 0000200000000280 RDI: 0000000000000006 RBP: 00007f9cedd4e610 R08: 0000000000000004 R09: 00007ffd67f88388 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd67f88378 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid_or_report+0x20/0x200 lib/list_debug.c:49 Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 54 55 53 48 89 fb 48 83 c7 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 01 00 00 48 89 da 48 8b 6b 08 48 b8 00 00 00 RSP: 0018:ffffc9000410f2e8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000050 RCX: 1ffff1100f97af5c RDX: 000000000000000b RSI: ffffffff898bef4c RDI: 0000000000000058 RBP: 0000000000000050 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000000a0000 R11: 0000000000000001 R12: ffffffff8ce802e0 R13: 0000000000000058 R14: ffffffff8ce802c0 R15: ffff88807cbd7800 FS: 000055557a6d4380(0000) GS:ffff888124852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001fc0 CR3: 00000000721d4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: f3 0f 1e fa endbr64 e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 41 54 push %r12 1a: 55 push %rbp 1b: 53 push %rbx 1c: 48 89 fb mov %rdi,%rbx 1f: 48 83 c7 08 add $0x8,%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 8b 01 00 00 jne 0x1bf 34: 48 89 da mov %rbx,%rdx 37: 48 8b 6b 08 mov 0x8(%rbx),%rbp 3b: 48 rex.W 3c: b8 .byte 0xb8 3d: 00 00 add %al,(%rax) --- 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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