kernel BUG in create_default_group...

Status: upstream: reported C repro on 2026/10/19 18:08
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+4fae162886e497f72228@syzkaller.appspotmail.com
First crash: 4d11h, last: 4d11h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
f38d71dd assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ FuzzingArtifact: ❌ MemoryCorruption: ❌ NetworkNeedsSetup: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ kernel BUG in create_default_group... 2026/10/22 15:01 2026/10/22 15:01 2026/10/22 15:43 33f73a1b
5ba9d719 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ kernel BUG in create_default_group... 2026/10/18 05:58 2026/10/18 05:58 2026/10/18 06:02 432c0077
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] configfs: Delay the fop setting to prevent noise generated by open 3 (3) 2026/10/22 11:11
[syzbot] kernel BUG in create_default_group... 3 (7) 2026/10/22 10:04
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2026/10/22 09:47 16m eadavis@sina.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58161ead29e5 report job log log
2026/10/21 09:40 17m eadavis@sina.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58161ead29e5 report job log log
2026/10/21 05:31 17m eadavis@sina.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58161ead29e5 report job log log

Sample crash report:
Warning: Permanently added '[localhost]:19552' (ED25519) to the list of known hosts.
[*] Starting reproducer for kernel BUG in create_default_group...
[+] mkdir /sys/kernel/config successful or directory already exists.
[+] configfs mounted or already mounted.
[+] mkdir /sys/kernel/debug successful or directory already exists.
[+] debugfs mounted or already mounted.
[+] Successfully wrote 'N
' to /sys/kernel/debug/failslab/ignore-gfp-wait
[+] Successfully wrote 'N
' to /sys/kernel/debug/failslab/cache-filter
[+] Successfully wrote '-1
' to /sys/kernel/debug/failslab/times
[+] Pre-clean of /sys/kernel/config/nvmet/ports/1 successful.
[+] Online CPU count: 1
[+] Started 6 background racing helper threads.
[*] Iterating fault injection points (fail-nth 1..80 with concurrent race)...
[*] Testing fail-nth = 1 (1 attempts)...
[*] Testing fail-nth = 2 (1 attempts)...
[*] Testing fail-nth = 3 (1 attempts)...
[*] Testing fail-nth = 4 (1 attempts)...
[*] Testing fail-nth = 5 (1 attempts)...
[*] Testing fail-nth = 6 (1 attempts)...
[*] Testing fail-nth = 7 (1 attempts)...
[*] Testing fail-nth = 8 (1 attempts)...
[*] Testing fail-nth = 9 (1 attempts)...
[*] Testing fail-nth = 10 (1 attempts)...
[*] Testing fail-nth = 11 (1 attempts)...
[*] Testing fail-nth = 12 (1 attempts)...
[*] Testing fail-nth = 13 (1 attempts)...
[*] Testing fail-nth = 14 (1 attempts)...
[*] Testing fail-nth = 15 (1 attempts)...
[*] Testing fail-nth = 16 (1 attempts)...
[*] Testing fail-nth = 17 (1 attempts)...
[*] Testing fail-nth = 18 (1 attempts)...
[*] Testing fail-nth = 19 (1 attempts)...
[*] Testing fail-nth = 20 (1 attempts)...
[*] Testing fail-nth = 21 (1 attempts)...
[*] Testing fail-nth = 22 (1 attempts)...
[*] Testing fail-nth = 23 (1 attempts)...
[*] Testing fail-nth = 24 (1 attempts)...
[*] Testing fail-nth = 25 (1 attempts)...
[*] Testing fail-nth = 26 (1 attempts)...
[*] Testing fail-nth = 27 (1 attempts)...
[*] Testing fail-nth = 28 (1 attempts)...
[*] Testing fail-nth = 29 (1 attempts)...
[*] Testing fail-nth = 30 (1 attempts)...
[*] Testing fail-nth = 31 (1 attempts)...
[*] Testing fail-nth = 32 (1 attempts)...
[*] Testing fail-nth = 33 (1 attempts)...
[*] Testing fail-nth = 34 (1 attempts)...

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/18 05:57 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58161ead29e5 432c0077 .config console log report C ci-snapshot-upstream-root kernel BUG in create_default_group...
* Struck through repros no longer work on HEAD.