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general protection fault in qfq_reset_qdisc (2)

Status: closed as invalid on 2023/12/05 18:14
Subsystems: net
[Documentation on labels]
First crash: 183d, last: 183d
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 general protection fault in qfq_reset_qdisc (2) 2 1113d 1190d 0/1 auto-closed as invalid on 2021/07/26 19:48
upstream general protection fault in qfq_reset_qdisc net 5 611d 683d 0/26 auto-obsoleted due to no activity on 2022/11/11 06:00
upstream KASAN: slab-use-after-free Read in qfq_reset_qdisc net 3 259d 302d 0/26 closed as invalid on 2023/09/21 09:36
upstream general protection fault in qfq_reset_qdisc (3) net 2 55d 106d 0/26 closed as invalid on 2024/03/12 16:19
linux-4.14 general protection fault in qfq_reset_qdisc 1 1521d 1521d 0/1 auto-closed as invalid on 2020/06/13 20:08
upstream KASAN: use-after-free Read in qfq_reset_qdisc net 1 818d 818d 0/26 closed as invalid on 2022/02/17 02:00

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]
CPU: 0 PID: 3940 Comm: kworker/u4:5 Not tainted 6.6.0-rc5-syzkaller-00192-g2d1c882d4434 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: netns cleanup_net
RIP: 0010:qfq_reset_qdisc+0x117/0x420 net/sched/sch_qfq.c:1471
Code: 62 27 f9 4c 8d 6b 50 4c 89 e8 48 c1 e8 03 80 3c 28 00 0f 85 1a 02 00 00 4c 8b 73 50 49 8d be e8 00 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 08 3c 03 0f 8e 0f 02 00 00 45 8b be e8 00 00
RSP: 0018:ffffc900163a78b8 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff8880465dc900 RCX: 0000000000000000
RDX: ffff88802e628000 RSI: ffffffff886063e0 RDI: 00000000000000e8
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffff88808346c2d0
R13: ffff8880465dc950 R14: 0000000000000000 R15: ffffed101068d85a
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3335d46ee0 CR3: 0000000074498000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_reset+0xd8/0x620 net/sched/sch_generic.c:1022
 __qdisc_destroy+0x91/0x450 net/sched/sch_generic.c:1060
 qdisc_put+0xd1/0xf0 net/sched/sch_generic.c:1090
 dev_shutdown+0x1ce/0x430 net/sched/sch_generic.c:1478
 unregister_netdevice_many_notify+0x5bd/0x1a20 net/core/dev.c:10932
 unregister_netdevice_many net/core/dev.c:10998 [inline]
 default_device_exit_batch+0x584/0x740 net/core/dev.c:11457
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qfq_reset_qdisc+0x117/0x420 net/sched/sch_qfq.c:1471
Code: 62 27 f9 4c 8d 6b 50 4c 89 e8 48 c1 e8 03 80 3c 28 00 0f 85 1a 02 00 00 4c 8b 73 50 49 8d be e8 00 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 08 3c 03 0f 8e 0f 02 00 00 45 8b be e8 00 00
RSP: 0018:ffffc900163a78b8 EFLAGS: 00010206
RAX: 000000000000001d RBX: ffff8880465dc900 RCX: 0000000000000000
RDX: ffff88802e628000 RSI: ffffffff886063e0 RDI: 00000000000000e8
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffff88808346c2d0
R13: ffff8880465dc950 R14: 0000000000000000 R15: ffffed101068d85a
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3335d46ee0 CR3: 000000002541b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	f9                   	stc
   1:	4c 8d 6b 50          	lea    0x50(%rbx),%r13
   5:	4c 89 e8             	mov    %r13,%rax
   8:	48 c1 e8 03          	shr    $0x3,%rax
   c:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  10:	0f 85 1a 02 00 00    	jne    0x230
  16:	4c 8b 73 50          	mov    0x50(%rbx),%r14
  1a:	49 8d be e8 00 00 00 	lea    0xe8(%r14),%rdi
  21:	48 89 f8             	mov    %rdi,%rax
  24:	48 c1 e8 03          	shr    $0x3,%rax
* 28:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2c:	84 c0                	test   %al,%al
  2e:	74 08                	je     0x38
  30:	3c 03                	cmp    $0x3,%al
  32:	0f 8e 0f 02 00 00    	jle    0x247
  38:	45                   	rex.RB
  39:	8b                   	.byte 0x8b
  3a:	be                   	.byte 0xbe
  3b:	e8                   	.byte 0xe8

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/15 04:03 net 2d1c882d4434 6388bc36 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in qfq_reset_qdisc
* Struck through repros no longer work on HEAD.