* [syzbot] [net?] general protection fault in hfsc_qlen_notify
@ 2025-07-03 8:17 syzbot
2025-07-03 23:31 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2025-07-03 8:17 UTC (permalink / raw)
To: davem, edumazet, horms, jhs, jiri, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs, xiyou.wangcong
Hello,
syzbot found 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=16510c8c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=36b0e72cad5298f8
dashboard link: https://syzkaller.appspot.com/bug?extid=5eccb463fa89309d8bdc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
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+5eccb463fa89309d8bdc@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef]
CPU: 0 UID: 0 PID: 13767 Comm: syz.0.2184 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:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238
Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 d0 ef 45 f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 e9
RSP: 0018:ffffc90003d2f070 EFLAGS: 00010203
RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000c0e9000 RSI: 0000000000000323 RDI: 0000000000000324
RBP: dffffc0000000000 R08: ffff88802c831e00 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff897a5e80 R12: dffffc0000000000
R13: ffff888053eaa000 R14: 00000000000002ec R15: ffff888053eaa000
FS: 00007f783fff36c0(0000) GS:ffff888125c50000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d435e1e9c CR3: 000000005e97a000 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_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: 0033:0x7f783f18e929
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:00007f783fff3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f783f3b5fa0 RCX: 00007f783f18e929
RDX: 0000000000000800 RSI: 0000200000000100 RDI: 0000000000000005
RBP: 00007f783f210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f783f3b5fa0 R15: 00007ffd53451d68
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsc_qlen_notify+0x2e/0x160 net/sched/sch_hfsc.c:1238
Code: 55 41 57 41 56 41 55 41 54 53 48 89 f3 49 bc 00 00 00 00 00 fc ff df e8 d0 ef 45 f8 4c 8d b3 ec 02 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e8 00 00 00 41 8b 2e 31 ff 89 ee e8 e9
RSP: 0018:ffffc90003d2f070 EFLAGS: 00010203
RAX: 000000000000005d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000c0e9000 RSI: 0000000000000323 RDI: 0000000000000324
RBP: dffffc0000000000 R08: ffff88802c831e00 R09: 0000000000000002
R10: 00000000ffffffff R11: ffffffff897a5e80 R12: dffffc0000000000
R13: ffff888053eaa000 R14: 00000000000002ec R15: ffff888053eaa000
FS: 00007f783fff36c0(0000) GS:ffff888125c50000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d435e1e9c CR3: 000000005e97a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 55 push %rbp
1: 41 57 push %r15
3: 41 56 push %r14
5: 41 55 push %r13
7: 41 54 push %r12
9: 53 push %rbx
a: 48 89 f3 mov %rsi,%rbx
d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12
14: fc ff df
17: e8 d0 ef 45 f8 call 0xf845efec
1c: 4c 8d b3 ec 02 00 00 lea 0x2ec(%rbx),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 e8 00 00 00 jne 0x11f
37: 41 8b 2e mov (%r14),%ebp
3a: 31 ff xor %edi,%edi
3c: 89 ee mov %ebp,%esi
3e: e8 .byte 0xe8
3f: e9 .byte 0xe9
---
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@googlegroups.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 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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [net?] general protection fault in hfsc_qlen_notify
2025-07-03 8:17 [syzbot] [net?] general protection fault in hfsc_qlen_notify syzbot
@ 2025-07-03 23:31 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2025-07-03 23:31 UTC (permalink / raw)
To: davem, edumazet, horms, jhs, jiri, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs, xiyou.wangcong
syzbot has found a reproducer for the following issue on:
HEAD commit: 17bbde2e1716 Merge tag 'net-6.16-rc5' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11478c8c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e3bca8ec7d38c1ef
dashboard link: https://syzkaller.appspot.com/bug?extid=5eccb463fa89309d8bdc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1633f48c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115d948c580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-17bbde2e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3e731bc6ea60/vmlinux-17bbde2e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9aa1c1fb114f/bzImage-17bbde2e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5eccb463fa89309d8bdc@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef]
CPU: 2 UID: 0 PID: 6086 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:hfsc_qlen_notify+0x28/0x180 net/sched/sch_hfsc.c:1238
Code: 90 90 f3 0f 1e fa 41 54 55 53 48 89 f3 e8 90 82 34 f8 48 8d bb ec 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08
RSP: 0018:ffffc900047672e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff110053accb8
RDX: 000000000000005d RSI: ffffffff89879e10 RDI: 00000000000002ec
RBP: 00000000000afff2 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000000afff2 R11: 0000000000000001 R12: ffffffff8ce7c3e0
R13: 0000000000000000 R14: ffffffff8ce7c3c0 R15: ffff888029d66000
FS: 00005555783cf500(0000) GS:ffff8880d6952000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c0 CR3: 00000000322e2000 CR4: 0000000000352ef0
Call Trace:
<TASK>
qdisc_tree_reduce_backlog+0x221/0x500 net/sched/sch_api.c:811
fq_codel_change+0xb1a/0x11b0 net/sched/sch_fq_codel.c:450
fq_codel_init+0x4ce/0xa60 net/sched/sch_fq_codel.c:487
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: 0033:0x7ff88858e929
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:00007ffce57d9328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff8887b5fa0 RCX: 00007ff88858e929
RDX: 0000000000004000 RSI: 0000200000000040 RDI: 0000000000000006
RBP: 00007ff888610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8887b5fa0 R14: 00007ff8887b5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsc_qlen_notify+0x28/0x180 net/sched/sch_hfsc.c:1238
Code: 90 90 f3 0f 1e fa 41 54 55 53 48 89 f3 e8 90 82 34 f8 48 8d bb ec 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08
RSP: 0018:ffffc900047672e0 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff110053accb8
RDX: 000000000000005d RSI: ffffffff89879e10 RDI: 00000000000002ec
RBP: 00000000000afff2 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000000afff2 R11: 0000000000000001 R12: ffffffff8ce7c3e0
R13: 0000000000000000 R14: ffffffff8ce7c3c0 R15: ffff888029d66000
FS: 00005555783cf500(0000) GS:ffff8880d6952000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c0 CR3: 00000000322e2000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: f3 0f 1e fa endbr64
6: 41 54 push %r12
8: 55 push %rbp
9: 53 push %rbx
a: 48 89 f3 mov %rsi,%rbx
d: e8 90 82 34 f8 call 0xf83482a2
12: 48 8d bb ec 02 00 00 lea 0x2ec(%rbx),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 08 test %ecx,(%rax)
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-07-03 23:31 UTC | newest]
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