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Message-ID: <69256ca4.a70a0220.2ea503.0088.GAE@google.com> Date: Tue, 25 Nov 2025 00:45:24 -0800 From: syzbot ci <syzbot+ci4f0c6bd07d511716@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, netdev@...r.kernel.org, pabeni@...hat.com, victor@...atatu.com, xiyou.wangcong@...il.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: net/sched: Introduce qdisc quirk_chk op syzbot ci has tested the following series [v1] net/sched: Introduce qdisc quirk_chk op https://lore.kernel.org/all/20251124223749.503979-1-victor@mojatatu.com * [RFC PATCH net-next] net/sched: Introduce qdisc quirk_chk op and found the following issue: general protection fault in netem_quirk_chk Full report is available here: https://ci.syzbot.org/series/0ba1b5b2-32e5-45b5-9ede-1290a7852d5e *** general protection fault in netem_quirk_chk tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: e2c20036a8879476c88002730d8a27f4e3c32d4b arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/0064d8bc-3c48-4267-9b5e-0f43a8514002/config C repro: https://ci.syzbot.org/findings/17d4a158-13d5-439e-8a4d-10e6e40a2ab1/c_repro syz repro: https://ci.syzbot.org/findings/17d4a158-13d5-439e-8a4d-10e6e40a2ab1/syz_repro netlink: 28 bytes leftover after parsing attributes in process `syz.0.17'. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 5959 Comm: syz.0.17 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:netem_quirk_chk+0x37/0x660 net/sched/sch_netem.c:999 Code: 53 48 83 ec 30 48 89 54 24 08 49 89 f7 48 89 fd 49 be 00 00 00 00 00 fc ff df e8 e4 68 67 f8 49 83 c7 14 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a0 05 00 00 41 8b 37 31 ff 89 74 24 04 RSP: 0018:ffffc90003737260 EFLAGS: 00010203 RAX: 0000000000000002 RBX: dffffc0000000000 RCX: ffff888113168000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881139f3000 RBP: ffff8881139f3000 R08: ffff888113168000 R09: 0000000000000002 R10: 00000000fffffff1 R11: ffffffff89589ab0 R12: ffff8881166a0000 R13: ffffffff89589ab0 R14: dffffc0000000000 R15: 0000000000000014 FS: 0000555559c83500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000100 CR3: 000000010a1b0000 CR4: 00000000000006f0 Call Trace: <TASK> qdisc_create+0x73f/0xf10 net/sched/sch_api.c:1319 __tc_modify_qdisc net/sched/sch_api.c:1765 [inline] tc_modify_qdisc+0x1582/0x2140 net/sched/sch_api.c:1829 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6967 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe6bff8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff10f91288 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe6c01e5fa0 RCX: 00007fe6bff8f749 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007fe6c0013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6c01e5fa0 R14: 00007fe6c01e5fa0 R15: 0000000000000003 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netem_quirk_chk+0x37/0x660 net/sched/sch_netem.c:999 Code: 53 48 83 ec 30 48 89 54 24 08 49 89 f7 48 89 fd 49 be 00 00 00 00 00 fc ff df e8 e4 68 67 f8 49 83 c7 14 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a0 05 00 00 41 8b 37 31 ff 89 74 24 04 RSP: 0018:ffffc90003737260 EFLAGS: 00010203 RAX: 0000000000000002 RBX: dffffc0000000000 RCX: ffff888113168000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881139f3000 RBP: ffff8881139f3000 R08: ffff888113168000 R09: 0000000000000002 R10: 00000000fffffff1 R11: ffffffff89589ab0 R12: ffff8881166a0000 R13: ffffffff89589ab0 R14: dffffc0000000000 R15: 0000000000000014 FS: 0000555559c83500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000100 CR3: 000000010a1b0000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: 48 83 ec 30 sub $0x30,%rsp 5: 48 89 54 24 08 mov %rdx,0x8(%rsp) a: 49 89 f7 mov %rsi,%r15 d: 48 89 fd mov %rdi,%rbp 10: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 17: fc ff df 1a: e8 e4 68 67 f8 call 0xf8676903 1f: 49 83 c7 14 add $0x14,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 a0 05 00 00 jne 0x5d7 37: 41 8b 37 mov (%r15),%esi 3a: 31 ff xor %edi,%edi 3c: 89 74 24 04 mov %esi,0x4(%rsp) *** 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@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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