syzbot


WARNING: ODEBUG bug in advance_sched

Status: upstream: reported C repro on 2023/12/21 13:47
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+ec9b5cce58002d184fb6@syzkaller.appspotmail.com
First crash: 398d, last: 108d
Cause bisection: introduced by (bisect log) :
commit 7b9eba7ba0c1b24df42b70b62d154b284befbccf
Author: Leandro Dorileo <leandro.maciel.dorileo@intel.com>
Date: Mon Apr 8 17:12:17 2019 +0000

  net/sched: taprio: fix picos_per_byte miscalculation

Crash: WARNING in taprio_dequeue (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit f504465970aebb2467da548f7c1efbbf36d0f44b
Author: Dmitry Antipov <dmantipov@yandex.ru>
Date: Fri Oct 18 05:13:38 2024 +0000

  net: sched: fix use-after-free in taprio_change()

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] WARNING: ODEBUG bug in advance_sched 1 (5) 2024/11/11 19:31
Last patch testing requests (11)
Created Duration User Patch Repo Result
2024/12/29 01:32 25m retest repro upstream OK log
2024/12/09 03:51 23m retest repro upstream OK log
2024/12/09 01:23 27m retest repro upstream OK log
2024/11/27 03:49 20m retest repro net report log
2024/10/28 08:19 1h15m retest repro net OK log
2024/10/28 08:19 21m retest repro net OK log
2024/10/28 04:01 29m retest repro net-next OK log
2024/10/28 03:05 27m retest repro net-next OK log
2024/10/20 00:23 30m retest repro upstream report log
2024/09/30 03:02 22m retest repro upstream report log
2023/12/22 11:07 24m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/11/11 12:42 6h47m bisect fix upstream OK (1) job log
2024/10/05 20:56 3h12m bisect fix upstream OK (0) job log log
2024/09/04 01:08 1h49m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
ODEBUG: activate active (active state 1) object: ffff88802cbb6100 object type: rcu_head hint: 0x0
WARNING: CPU: 0 PID: 5724 at lib/debugobjects.c:517 debug_print_object+0x17a/0x1f0 lib/debugobjects.c:514
Modules linked in:
CPU: 0 PID: 5724 Comm: syz-executor305 Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:debug_print_object+0x17a/0x1f0 lib/debugobjects.c:514
Code: e8 9b e4 4b fd 4c 8b 0b 48 c7 c7 20 d0 fe 8b 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f8 ff 34 24 e8 8b 77 ab fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 ac 8f da 0a 48 83 c4 10 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc900000079f8 EFLAGS: 00010082
RAX: d5508f63fe948f00 RBX: ffffffff8babd3a0 RCX: ffff8880203e5a00
RDX: 0000000080010203 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8bfed1a0 R08: ffffffff8157cc12 R09: 1ffff110172851a2
R10: dffffc0000000000 R11: ffffed10172851a3 R12: 0000000000000001
R13: ffffffff8bfed0b8 R14: dffffc0000000000 R15: ffff88802cbb6100
FS:  0000555583e1e380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555583e1eca8 CR3: 0000000028228000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_object_activate+0x357/0x510 lib/debugobjects.c:732
 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline]
 __call_rcu_common kernel/rcu/tree.c:2719 [inline]
 call_rcu+0x97/0xa70 kernel/rcu/tree.c:2838
 switch_schedules net/sched/sch_taprio.c:212 [inline]
 advance_sched+0x940/0xca0 net/sched/sch_taprio.c:973
 __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
 __hrtimer_run_queues+0x595/0xd00 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 3e 8e 7d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e3 43 ea f5 65 8b 05 34 26 89 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90003ad6b00 EFLAGS: 00000206
RAX: d5508f63fe948f00 RBX: 1ffff9200075ad64 RCX: ffffffff81720c2a
RDX: dffffc0000000000 RSI: ffffffff8baac220 RDI: 0000000000000001
RBP: ffffc90003ad6b90 R08: ffffffff92cc75c7 R09: 1ffffffff2598eb8
R10: dffffc0000000000 R11: fffffbfff2598eb9 R12: dffffc0000000000
R13: 1ffff9200075ad60 R14: ffffc90003ad6b20 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 taprio_change+0x339b/0x42d0 net/sched/sch_taprio.c:1974
 qdisc_change net/sched/sch_api.c:1416 [inline]
 tc_modify_qdisc+0x190d/0x1e40 net/sched/sch_api.c:1746
 rtnetlink_rcv_msg+0x89b/0x10d0 net/core/rtnetlink.c:6595
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2559
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmmsg+0x3b2/0x740 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f2a9798e779
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 1d 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce2099e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2a9798e779
RDX: 0492492492492856 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffce2099e90
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce2099e78
R13: 00007ffce2099eb0 R14: 0000000000000246 R15: 431bde82d7b634db
 </TASK>
----------------
Code disassembly (best guess):
   0:	9c                   	pushf
   1:	8f 44 24 20          	pop    0x20(%rsp)
   5:	42 80 3c 23 00       	cmpb   $0x0,(%rbx,%r12,1)
   a:	74 08                	je     0x14
   c:	4c 89 f7             	mov    %r14,%rdi
   f:	e8 3e 8e 7d f6       	call   0xf67d8e52
  14:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
  19:	75 52                	jne    0x6d
  1b:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 e3 43 ea f5       	call   0xf5ea4412 <-- trapping instruction
  2f:	65 8b 05 34 26 89 74 	mov    %gs:0x74892634(%rip),%eax        # 0x7489266a
  36:	85 c0                	test   %eax,%eax
  38:	74 43                	je     0x7d
  3a:	48                   	rex.W
  3b:	c7                   	.byte 0xc7
  3c:	04 24                	add    $0x24,%al
  3e:	0e                   	(bad)
  3f:	36                   	ss

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/24 13:00 net f99c5f563c17 0ea90952 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/04/01 20:11 upstream fe46a7dd189e 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: ODEBUG bug in advance_sched
2024/03/20 06:20 upstream 480e035fc4c7 a485f239 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/02/20 01:15 upstream b401b621758e 3af7dd65 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in advance_sched
2023/12/21 10:24 upstream 1a44b0073b92 4f9530a3 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/04/11 07:43 net f99c5f563c17 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/02/14 13:00 net 1e41f11f08bc d902085f .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/02/14 05:19 net 1e41f11f08bc d902085f .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/02/12 05:54 net-next 970cb1ceda17 77b23aa1 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING: ODEBUG bug in advance_sched
2024/02/10 12:45 net-next b63cc73341e0 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING: ODEBUG bug in advance_sched
* Struck through repros no longer work on HEAD.