From: syzbot <syzbot+d8b58d7b0ad89a678a16@syzkaller.appspotmail.com>
To: davem@davemloft.net, edumazet@google.com, horms@kernel.org,
jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com, syzkaller-bugs@googlegroups.com,
xiyou.wangcong@gmail.com
Subject: Re: [syzbot] [net?] general protection fault in htb_qlen_notify
Date: Thu, 03 Jul 2025 04:32:24 -0700 [thread overview]
Message-ID: <68666a48.a00a0220.c7b3.0003.GAE@google.com> (raw)
In-Reply-To: <68663c93.a70a0220.5d25f.0857.GAE@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: bd475eeaaf3c Merge branch '200GbE' of git://git.kernel.org..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=15cc0582580000
kernel config: https://syzkaller.appspot.com/x/.config?x=36b0e72cad5298f8
dashboard link: https://syzkaller.appspot.com/bug?extid=d8b58d7b0ad89a678a16
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=1113748c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10909ebc580000
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+d8b58d7b0ad89a678a16@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000035: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001a8-0x00000000000001af]
CPU: 1 UID: 0 PID: 6017 Comm: syz.0.16 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:htb_deactivate net/sched/sch_htb.c:613 [inline]
RIP: 0010:htb_qlen_notify+0x31/0xc0 net/sched/sch_htb.c:1489
Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 3d c6 46 f8 49 8d 9e a8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4d 8b 2b 31 ff 89 ee e8 5a ca 46 f8 85
RSP: 0018:ffffc900034f6fb0 EFLAGS: 00010206
RAX: ffffffff89798833 RBX: 00000000000001a8 RCX: ffff88802714bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807a6ac000
RBP: dffffc0000000000 R08: ffff88802714bc00 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff89798810 R12: dffffc0000000000
R13: 0000000000000035 R14: 0000000000000000 R15: ffff88807a6ac000
FS: 00007fa0c3df16c0(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0c3dd0d58 CR3: 00000000743e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
qdisc_tree_reduce_backlog+0x29c/0x480 net/sched/sch_api.c:811
fq_change+0x1519/0x1f50 net/sched/sch_fq.c:1147
fq_init+0x699/0x960 net/sched/sch_fq.c:1201
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: 0033:0x7fa0c2f8e929
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:00007fa0c3df1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa0c31b5fa0 RCX: 00007fa0c2f8e929
RDX: 0000000000044080 RSI: 0000200000000040 RDI: 0000000000000006
RBP: 00007fa0c3010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa0c31b5fa0 R15: 00007ffd14aa8178
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:htb_deactivate net/sched/sch_htb.c:613 [inline]
RIP: 0010:htb_qlen_notify+0x31/0xc0 net/sched/sch_htb.c:1489
Code: 41 56 41 55 41 54 53 49 89 f6 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 3d c6 46 f8 49 8d 9e a8 01 00 00 49 89 dd 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 75 4d 8b 2b 31 ff 89 ee e8 5a ca 46 f8 85
RSP: 0018:ffffc900034f6fb0 EFLAGS: 00010206
RAX: ffffffff89798833 RBX: 00000000000001a8 RCX: ffff88802714bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807a6ac000
RBP: dffffc0000000000 R08: ffff88802714bc00 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff89798810 R12: dffffc0000000000
R13: 0000000000000035 R14: 0000000000000000 R15: ffff88807a6ac000
FS: 00007fa0c3df16c0(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0c3dd0d58 CR3: 00000000743e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 41 56 push %r14
2: 41 55 push %r13
4: 41 54 push %r12
6: 53 push %rbx
7: 49 89 f6 mov %rsi,%r14
a: 49 89 ff mov %rdi,%r15
d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12
14: fc ff df
17: e8 3d c6 46 f8 call 0xf846c659
1c: 49 8d 9e a8 01 00 00 lea 0x1a8(%r14),%rbx
23: 49 89 dd mov %rbx,%r13
26: 49 c1 ed 03 shr $0x3,%r13
* 2a: 43 0f b6 44 25 00 movzbl 0x0(%r13,%r12,1),%eax <-- trapping instruction
30: 84 c0 test %al,%al
32: 75 4d jne 0x81
34: 8b 2b mov (%rbx),%ebp
36: 31 ff xor %edi,%edi
38: 89 ee mov %ebp,%esi
3a: e8 5a ca 46 f8 call 0xf846ca99
3f: 85 .byte 0x85
---
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.
next prev parent reply other threads:[~2025-07-03 11:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-03 8:17 syzbot
2025-07-03 11:32 ` syzbot [this message]
2025-07-03 15:05 ` Lion, can you take a look at his? WAS(Re: " Jamal Hadi Salim
2025-07-03 16:39 ` Jamal Hadi Salim
2025-07-03 21:06 ` Victor Nogueira
2025-07-04 1:12 ` syzbot
2025-07-05 5:43 ` syzbot
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