WARNING: lock held when returning to user space in cfg80211_wext_siwgenie

Status: upstream: reported C repro on 2026/10/03 19:35
Reported-by: syzbot+4a8a0cae8222a7a96a15@syzkaller.appspotmail.com
First crash: 14d, last: 6h07m
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING: lock held when returning to user space in cfg80211_wext_siwgenie 4 syz, C 33 8h12m 14d 0/3 upstream: reported C repro on 2026/10/03 12:20
linux-5.15 WARNING: lock held when returning to user space in cfg80211_wext_siwgenie origin:lts-only 4 syz, C 29 11h11m 14d 0/3 upstream: reported C repro on 2026/10/03 12:26

Sample crash report:
warning: `syz.0.17' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211
================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.0.17/5971 is leaving the kernel with locks still held!
2 locks held by syz.0.17/5971:
 #0: ffff888024de0768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5777 [inline]
 #0: ffff888024de0768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_wext_siwgenie+0xd5/0x3f0 net/wireless/wext-sme.c:341
 #1: ffff888025028dc0 (&wdev->mtx){+.+.}-{3:3}, at: wdev_lock net/wireless/core.h:231 [inline]
 #1: ffff888025028dc0 (&wdev->mtx){+.+.}-{3:3}, at: cfg80211_wext_siwgenie+0xe0/0x3f0 net/wireless/wext-sme.c:342

Crashes (22):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/17 22:50 linux-6.6.y cecd39af8a1a 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/04 09:20 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/18 05:03 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/18 05:03 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 23:43 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 23:40 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/17 23:38 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/15 10:02 linux-6.6.y a91a6aa9253c 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:46 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:45 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:39 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:39 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:36 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/10 03:36 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 06:21 linux-6.6.y a91a6aa9253c b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/09 06:21 linux-6.6.y a91a6aa9253c b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 21:19 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 21:19 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 08:13 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/05 08:11 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 19:35 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
2026/10/03 19:35 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: lock held when returning to user space in cfg80211_wext_siwgenie
* Struck through repros no longer work on HEAD.