Re: [syzbot] kernel BUG in create_default_group...

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in create_default_group...

Warning: Permanently added '[localhost]:36728' (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)...
[*] Testing fail-nth = 35 (1 attempts)...
[*] Testing fail-nth = 36 (1 attempts)...
[*] Testing fail-nth = 37 (1 attempts)...
[*] Testing fail-nth = 38 (12 attempts)...
[*] Testing fail-nth = 39 (12 attempts)...
[*] Testing fail-nth = 40 (12 attempts)...
[*] Testing fail-nth = 41 (12 attempts)...
[*] Testing fail-nth = 42 (12 attempts)...
[*] Testing fail-nth = 43 (12 attempts)...
[*] Testing fail-nth = 44 (12 attempts)...
[*] Testing fail-nth = 45 (12 attempts)...
[*] Testing fail-nth = 46 (12 attempts)...
[*] Testing fail-nth = 47 (12 attempts)...
[*] Testing fail-nth = 48 (12 attempts)...
[*] Testing fail-nth = 49 (12 attempts)...
[*] Testing fail-nth = 50 (12 attempts)...
[*] Testing fail-nth = 51 (1 attempts)...
[*] Testing fail-nth = 52 (1 attempts)...
[*] Testing fail-nth = 53 (1 attempts)...
[*] Testing fail-nth = 54 (1 attempts)...
[*] Testing fail-nth = 55 (1 attempts)...
[*] Testing fail-nth = 56 (1 attempts)...
[*] Testing fail-nth = 57 (1 attempts)...
[*] Testing fail-nth = 58 (1 attempts)...
[*] Testing fail-nth = 59 (1 attempts)...
[*] Testing fail-nth = 60 (1 attempts)...
[*] Testing fail-nth = 61 (1 attempts)...
[*] Testing fail-nth = 62 (1 attempts)...
[*] Testing fail-nth = 63 (1 attempts)...
[*] Testing fail-nth = 64 (1 attempts)...
[*] Testing fail-nth = 65 (1 attempts)...
[*] Testing fail-nth = 66 (1 attempts)...
[*] Testing fail-nth = 67 (1 attempts)...
[*] Testing fail-nth = 68 (1 attempts)...


Tested on:

commit:         58161ead Merge tag 'drm-fixes-2026-10-17' of https://g..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=17262831580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4ccb65e03706547e
dashboard link: https://syzkaller.appspot.com/bug?extid=4fae162886e497f72228
compiler:       Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14c2bb05580000