WARNING: lock held when returning to user space in cfg80211_wext_siwgenie

Status: upstream: reported C repro on 2026/10/03 12:26
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b822dedaa07eee372599@syzkaller.appspotmail.com
First crash: 14d, last: 10h01m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/10/06 linux-5.15.y (ToT) a051a4bf909f C [report] WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/06 upstream (ToT) 2c3418fffa9d C Didn't crash
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING: lock held when returning to user space in cfg80211_wext_siwgenie 4 syz, C 22 4h56m 14d 0/2 upstream: reported C repro on 2026/10/03 19:35
linux-6.1 WARNING: lock held when returning to user space in cfg80211_wext_siwgenie 4 syz, C 33 7h01m 14d 0/3 upstream: reported C repro on 2026/10/03 12:20

Sample crash report:
================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.0.17/4419 is leaving the kernel with locks still held!
1 lock held by syz.0.17/4419:
 #0: ffff8880235b4d40 (&wdev->mtx){+.+.}-{3:3}, at: wdev_lock net/wireless/core.h:226 [inline]
 #0: ffff8880235b4d40 (&wdev->mtx){+.+.}-{3:3}, at: cfg80211_wext_siwgenie+0xd4/0x3f0 net/wireless/wext-sme.c:327

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/09 10:53 linux-5.15.y a051a4bf909f b2734a59 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 20:19 linux-5.15.y a051a4bf909f 57bbd979 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 23:59 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 23:59 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 17:49 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 17:46 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 10:56 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 10:55 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 10:25 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 04:57 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 04:55 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 07:38 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 07:38 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:59 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:58 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:57 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:56 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:55 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:50 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:48 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 00:46 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/04 14:12 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/04 14:10 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 15:59 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 15:59 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 15:59 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 12:25 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 12:25 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 12:25 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
* Struck through repros no longer work on HEAD.