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WARNING in hci_conn_timeout

Status: upstream: reported C repro on 2025/06/25 01:13
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+e6c889790f3159fa29e2@syzkaller.appspotmail.com
First crash: 241d, last: 19d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/06/26 linux-6.6.y (ToT) 6282921b6825 C [report] WARNING in hci_conn_timeout
2025/06/26 upstream (ToT) f02769e7f272 C Didn't crash
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in hci_conn_timeout bluetooth -1 C done 6022 432d 2029d 28/29 fixed on 2024/12/16 09:50
linux-5.15 WARNING in hci_conn_timeout origin:lts-only -1 C done 1342 8h49m 1079d 0/3 upstream: reported C repro on 2023/03/10 14:50
linux-4.14 WARNING in hci_conn_timeout -1 C inconclusive 27 1097d 2031d 0/1 upstream: reported C repro on 2020/07/31 02:13
upstream WARNING in hci_conn_timeout (2) bluetooth -1 C error 11505 2h25m 430d 0/29 upstream: reported C repro on 2024/12/17 17:47
linux-4.19 WARNING in hci_conn_timeout -1 C error 127 1084d 2029d 0/1 upstream: reported C repro on 2020/08/01 17:09
linux-6.1 WARNING in hci_conn_timeout origin:lts-only -1 C done 4988 7h16m 1080d 0/3 upstream: reported C repro on 2023/03/08 17:34
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/07/14 07:29 2h58m fix candidate upstream OK (0) job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5790 at net/bluetooth/hci_conn.c:568 hci_conn_timeout+0xf9/0x290 net/bluetooth/hci_conn.c:568
Modules linked in:
CPU: 1 PID: 5790 Comm: kworker/u5:3 Not tainted 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci3 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0xf9/0x290 net/bluetooth/hci_conn.c:568
Code: f8 48 89 df e8 c8 b7 08 00 eb 07 e8 b1 11 1c f8 b0 13 0f b6 f0 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 ec e0 fe ff e8 97 11 1c f8 <0f> 0b eb 8e 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 38 ff ff ff 4c
RSP: 0018:ffffc900046afb90 EFLAGS: 00010293
RAX: ffffffff89698439 RBX: ffff88807ddde000 RCX: ffff888079918000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88807ddde013 R09: 1ffff1100fbbbc02
R10: dffffc0000000000 R11: ffffed100fbbbc03 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807ddde350 R15: ffff88807ddde010
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ff43a7094 CR3: 000000000cb30000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/25 20:27 linux-6.6.y 6282921b6825 26d77996 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2026/02/02 12:12 linux-6.6.y 2cf6f68313dc 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in hci_conn_timeout
2025/11/21 08:13 linux-6.6.y 0a805b6ea8cd 280ea308 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in hci_conn_timeout
2025/11/20 10:04 linux-6.6.y 0a805b6ea8cd 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/10/19 08:35 linux-6.6.y 0bbbd97a442d 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/10/19 02:51 linux-6.6.y 0bbbd97a442d 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/10/13 18:50 linux-6.6.y 655054d2c3c1 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/10/10 21:08 linux-6.6.y e617101e5626 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/10/10 01:55 linux-6.6.y e617101e5626 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf WARNING in hci_conn_timeout
2025/09/05 10:55 linux-6.6.y 355bd0b51d2f d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/09/03 14:10 linux-6.6.y cc1a1c5b404a 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/08/01 20:21 linux-6.6.y 3a8ababb8b6a 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/07/31 10:40 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/07/31 10:39 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/07/31 10:37 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/07/24 23:03 linux-6.6.y dbcb8d8e4163 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/07/04 12:54 linux-6.6.y 3f5b4c104b7d 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
2025/06/25 01:12 linux-6.6.y 6282921b6825 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in hci_conn_timeout
* Struck through repros no longer work on HEAD.