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From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 58161ead29e5 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=103272e1580000 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 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=173b8121580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4fae162886e497f72228@syzkaller.appspotmail.com 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)... --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup