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BUG: corrupted list in l2cap_chan_put

Status: upstream: reported C repro on 2020/08/05 14:55
Reported-by: syzbot+d5bb522618cf7eb1aa95@syzkaller.appspotmail.com
First crash: 1358d, last: 948d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: corrupted list in l2cap_chan_put C 6 420d 1357d 0/1 upstream: reported C repro on 2020/08/06 18:58
▶ ▼ Fix bisection attempts (16)
Created Duration User Patch Repo Result
2021/10/19 05:43 13m bisect fix linux-4.19.y error job log (0)
2021/09/19 05:06 37m bisect fix linux-4.19.y job log (0) log
2021/08/20 04:29 37m bisect fix linux-4.19.y job log (0) log
2021/07/21 03:50 38m bisect fix linux-4.19.y job log (0) log
2021/06/21 03:14 36m bisect fix linux-4.19.y job log (0) log
2021/05/21 07:05 37m bisect fix linux-4.19.y job log (0) log
2021/04/21 06:04 34m bisect fix linux-4.19.y job log (0) log
2021/03/22 05:28 35m bisect fix linux-4.19.y job log (0) log
2021/02/20 04:25 35m bisect fix linux-4.19.y job log (0) log
2021/02/17 17:57 19m bisect fix linux-4.19.y error job log (0)
2021/02/02 23:25 1m bisect fix linux-4.19.y error job log (0)
2021/01/03 22:48 30m bisect fix linux-4.19.y job log (0) log
2020/12/04 22:07 34m bisect fix linux-4.19.y job log (0) log
2020/11/04 18:22 39m bisect fix linux-4.19.y job log (0) log
2020/10/05 17:47 35m bisect fix linux-4.19.y job log (0) log
2020/09/05 16:43 36m bisect fix linux-4.19.y job log (0) log

Sample crash report:
list_del corruption, ffff8880a8fb7908->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7833 Comm: kworker/u5:4 Not tainted 4.19.137-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci1 hci_rx_work
RIP: 0010:__list_del_entry_valid.cold+0x23/0x55 lib/list_debug.c:45
Code: e8 56 27 f4 fd 0f 0b 48 89 ee 48 c7 c7 c0 08 cb 87 e8 45 27 f4 fd 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 00 08 cb 87 e8 31 27 f4 fd <0f> 0b 4c 89 e2 48 89 ee 48 c7 c7 60 08 cb 87 e8 1d 27 f4 fd 0f 0b
RSP: 0018:ffff8880a3807920 EFLAGS: 00010286
RAX: 000000000000004e RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8154cf41 RDI: ffffed1014700f16
RBP: ffff8880a8fb7908 R08: 000000000000004e R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dead000000000200
R13: dead000000000100 R14: ffff8880a8fb74c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000097084000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 l2cap_chan_destroy net/bluetooth/l2cap_core.c:476 [inline]
 kref_put include/linux/kref.h:70 [inline]
 l2cap_chan_put+0x5e/0x1c0 net/bluetooth/l2cap_core.c:493
 l2cap_conless_channel net/bluetooth/l2cap_core.c:6976 [inline]
 l2cap_recv_frame+0xd36/0xa550 net/bluetooth/l2cap_core.c:7023
 l2cap_recv_acldata+0x80e/0x910 net/bluetooth/l2cap_core.c:7588
 hci_acldata_packet net/bluetooth/hci_core.c:4178 [inline]
 hci_rx_work+0x455/0xa90 net/bluetooth/hci_core.c:4364
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x30b/0x410 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 20005df8c42c05e9 ]---
RIP: 0010:__list_del_entry_valid.cold+0x23/0x55 lib/list_debug.c:45
Code: e8 56 27 f4 fd 0f 0b 48 89 ee 48 c7 c7 c0 08 cb 87 e8 45 27 f4 fd 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 00 08 cb 87 e8 31 27 f4 fd <0f> 0b 4c 89 e2 48 89 ee 48 c7 c7 60 08 cb 87 e8 1d 27 f4 fd 0f 0b
RSP: 0018:ffff8880a3807920 EFLAGS: 00010286
RAX: 000000000000004e RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8154cf41 RDI: ffffed1014700f16
RBP: ffff8880a8fb7908 R08: 000000000000004e R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dead000000000200
R13: dead000000000100 R14: ffff8880a8fb74c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000097084000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/08/06 16:25 linux-4.19.y c076c79e03c6 4ca1c0ea .config console log report syz C ci2-linux-4-19
2020/08/06 01:30 linux-4.19.y c076c79e03c6 0487ea6f .config console log report syz C ci2-linux-4-19
2020/08/06 01:05 linux-4.19.y c076c79e03c6 0487ea6f .config console log report syz C ci2-linux-4-19
2020/08/06 00:04 linux-4.19.y c076c79e03c6 0487ea6f .config console log report syz C ci2-linux-4-19
2020/08/05 20:33 linux-4.19.y c076c79e03c6 b7129355 .config console log report syz C ci2-linux-4-19
2020/08/05 14:54 linux-4.19.y c076c79e03c6 b7129355 .config console log report syz C ci2-linux-4-19
* Struck through repros no longer work on HEAD.