* [syzbot ci] Re: net/sched: Introduce qdisc quirk_chk op
[not found] <20251124223749.503979-1-victor@mojatatu.com>
@ 2025-11-25 8:45 ` syzbot ci
0 siblings, 0 replies; 2+ messages in thread
From: syzbot ci @ 2025-11-25 8:45 UTC (permalink / raw)
To: davem, edumazet, jhs, jiri, kuba, netdev, pabeni, victor,
xiyou.wangcong
Cc: syzbot, syzkaller-bugs
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@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [syzbot ci] Re: net/sched: Introduce qdisc quirk_chk op
[not found] <20251125224604.872351-1-victor@mojatatu.com>
@ 2025-11-26 8:16 ` syzbot ci
0 siblings, 0 replies; 2+ messages in thread
From: syzbot ci @ 2025-11-26 8:16 UTC (permalink / raw)
To: davem, edumazet, horms, jhs, jiri, kuba, netdev, pabeni, stephen,
victor, xiyou.wangcong
Cc: syzbot, syzkaller-bugs
syzbot ci has tested the following series
[v2] net/sched: Introduce qdisc quirk_chk op
https://lore.kernel.org/all/20251125224604.872351-1-victor@mojatatu.com
* [RFC PATCH net-next v2] 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/aa7207e5-00c6-4c9d-b330-9b2041104daf
***
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/bbda2e20-2099-41bd-a7d4-c298c61ed2f5/config
C repro: https://ci.syzbot.org/findings/21f8d5f6-c5af-4e81-a8d5-56f5febd6f03/c_repro
syz repro: https://ci.syzbot.org/findings/21f8d5f6-c5af-4e81-a8d5-56f5febd6f03/syz_repro
netlink: 28 bytes leftover after parsing attributes in process `syz.0.17'.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5961 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:nla_len include/net/netlink.h:1296 [inline]
RIP: 0010:parse_attr net/sched/sch_netem.c:960 [inline]
RIP: 0010:netem_quirk_chk+0x8a/0x740 net/sched/sch_netem.c:990
Code: 7c 24 60 49 c1 ef 03 43 c7 04 27 f1 f1 f1 f1 43 c7 44 27 13 f3 f3 f3 f3 43 c6 44 27 17 f3 e8 8d 68 67 f8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 32 06 00 00 0f b7 03 83 c0 fc 44 0f b7
RSP: 0018:ffffc900032c7140 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88810ff73a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881b82ce000
RBP: ffffc900032c72b8 R08: ffff88810ff73a00 R09: 0000000000000002
R10: 00000000fffffff1 R11: ffffffff89589ab0 R12: dffffc0000000000
R13: ffffffff89589ab0 R14: ffffffff8f7d9580 R15: 1ffff92000658e34
FS: 000055558efa7500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000100 CR3: 0000000114760000 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: 0033:0x7f1beb98f749
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:00007ffd1afcc778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1bebbe5fa0 RCX: 00007f1beb98f749
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f1beba13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1bebbe5fa0 R14: 00007f1bebbe5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nla_len include/net/netlink.h:1296 [inline]
RIP: 0010:parse_attr net/sched/sch_netem.c:960 [inline]
RIP: 0010:netem_quirk_chk+0x8a/0x740 net/sched/sch_netem.c:990
Code: 7c 24 60 49 c1 ef 03 43 c7 04 27 f1 f1 f1 f1 43 c7 44 27 13 f3 f3 f3 f3 43 c6 44 27 17 f3 e8 8d 68 67 f8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 32 06 00 00 0f b7 03 83 c0 fc 44 0f b7
RSP: 0018:ffffc900032c7140 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88810ff73a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881b82ce000
RBP: ffffc900032c72b8 R08: ffff88810ff73a00 R09: 0000000000000002
R10: 00000000fffffff1 R11: ffffffff89589ab0 R12: dffffc0000000000
R13: ffffffff89589ab0 R14: ffffffff8f7d9580 R15: 1ffff92000658e34
FS: 000055558efa7500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000100 CR3: 0000000114760000 CR4: 00000000000006f0
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 24 60 and $0x60,%al
2: 49 c1 ef 03 shr $0x3,%r15
6: 43 c7 04 27 f1 f1 f1 movl $0xf1f1f1f1,(%r15,%r12,1)
d: f1
e: 43 c7 44 27 13 f3 f3 movl $0xf3f3f3f3,0x13(%r15,%r12,1)
15: f3 f3
17: 43 c6 44 27 17 f3 movb $0xf3,0x17(%r15,%r12,1)
1d: e8 8d 68 67 f8 call 0xf86768af
22: 48 89 d8 mov %rbx,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 32 06 00 00 jne 0x668
36: 0f b7 03 movzwl (%rbx),%eax
39: 83 c0 fc add $0xfffffffc,%eax
3c: 44 rex.R
3d: 0f .byte 0xf
3e: b7 .byte 0xb7
***
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.
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[not found] <20251124223749.503979-1-victor@mojatatu.com>
2025-11-25 8:45 ` [syzbot ci] Re: net/sched: Introduce qdisc quirk_chk op syzbot ci
[not found] <20251125224604.872351-1-victor@mojatatu.com>
2025-11-26 8:16 ` syzbot ci
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