From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 755B513957E for ; Mon, 24 Aug 2026 00:13:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787530413; cv=none; b=Du958HE2U3iXLbGoZ+mRw16PCTJ+mUXblIdtpJ/fWg0UOPEMXMgWviFgHykSdlE3sOhWF66SWRSJJAz6s46qoSjLvIr2awMNbffuJzVsQ9d330sRHYuMwUamvsRs/UDhrJExkmYURgAcqsTJWsrlp9CfVU679iiCpvD99G67ubE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787530413; c=relaxed/simple; bh=06AUqY0NWATXGns1wdsxvPErqV1uSYg2ZCeBcWJbPdA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kbEY/kPKJPCNnlVXrTdg37zLlbiAjOaE291jC8VwLcR8US+Z3eSwJuzEJg0rQq0BapcI/gVC1/WCTgASbynT6RII1Ulap8bESI4lCNixkW2KgpYFOtQWnI3sOXAGPmybwUymfb3TpkcLXwaw9XgaMdZpP9Fw+5nDmAoQyRh+4NE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f207.google.com with SMTP id 5614622812f47-4b2d1eb484aso5453431b6e.2 for ; Sun, 23 Aug 2026 17:13:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787530410; x=1788135210; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Z/+449VjIMMZq2CJMT31++BUW5kE71Qr3CUfJ8j1g/Q=; b=EjNhBb2T3H+RRtqgfcazyu9/WiutIn2AwyGYuTyE7t0S4DPKOZbxQMu0fVlGWP9SUD Qy1aC1RyvBFDIF4UTC8dOeZeutw5vv/J7viRqYlhDxqle3YzPE26C/k4Y8IKrdJ9Q/Kl LMVfbNNN/3eUElM8BKkS8v/sSQ6IfTt6wXwlGgLcJNrTrdns8pn810ghJsx6Hc/gLS+o ejcKXDVDV52Ft0ArdIg2x+zwJXhqeqjBt+5pYSlXtof7domortb0uo/DdM8WdVV4+Ir0 lNKXB7Z8jWhkbz9mVm/Gqs2idMSSe3/WplC/9Tz1Tw7Kcb5jUekRtA+bxlyBTgDAjQZg JW3g== X-Forwarded-Encrypted: i=1; AHgh+RqsX6JxT2sWgsAF6B4/0LIaxWR8oDBcOinJjA0DDDFHRkdt1bD/sGJIiA0fc8c90hlqQgW9vSvTUg7AXKo=@vger.kernel.org X-Gm-Message-State: AFuF++nrCIvc6fTi6x50vcDfbo3EMGZwo1671Zb+GiXii1ReCt55sD5A BMNSPJg6B3NfTNISEKI+qtjlNEsbLn1HDFJlYOoF2+iu9U+6nrdaLwHW4QIF19RTxHDupP2HNx2 aZVpqwQVGDk+MLykSTeqpkpd5y2qIaGKwWziEoC/WLS0cGsvF+DCMsXPzI0k= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1b0d:b0:4a4:12c4:9c16 with SMTP id 5614622812f47-4b2ef1fa073mr22692353b6e.7.1787530410429; Sun, 23 Aug 2026 17:13:30 -0700 (PDT) Date: Sun, 23 Aug 2026 17:13:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8b8caa.ae6ddae5.3da009.0071.GAE@google.com> Subject: [syzbot] [trace?] [fs?] WARNING in free_ei From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 98f21c54f995 Merge tag 'for-linus-fwctl' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=100af815580000 kernel config: https://syzkaller.appspot.com/x/.config?x=87880a67258a10c5 dashboard link: https://syzkaller.appspot.com/bug?extid=88bc830c26215a9f38dc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/14ce45f3c743/disk-98f21c54.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b189ccebbda8/vmlinux-98f21c54.xz kernel image: https://storage.googleapis.com/syzbot-assets/2d83175df409/bzImage-98f21c54.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+88bc830c26215a9f38dc@syzkaller.appspotmail.com Could not create tracefs 'set_event_notrace_pid' entry ------------[ cut here ]------------ !list_empty(&ei->children) WARNING: fs/tracefs/event_inode.c:128 at free_ei+0x284/0x340 fs/tracefs/event_inode.c:128, CPU#1: syz.4.591/8581 Modules linked in: CPU: 1 UID: 0 PID: 8581 Comm: syz.4.591 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:free_ei+0x284/0x340 fs/tracefs/event_inode.c:128 Code: 48 c7 c7 00 c1 11 8f 48 89 de 48 c7 c2 e0 94 d9 83 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 32 a5 d1 fd e8 cd 6c ed fd 90 <0f> 0b 90 e9 c7 fd ff ff e8 bf 6c ed fd 90 0f 0b 90 48 b8 00 00 00 RSP: 0018:ffffc9000432fa88 EFLAGS: 00010202 RAX: ffffffff83d99873 RBX: ffff8880752fe210 RCX: ffff888036070000 RDX: 0000000000000003 RSI: ffffffff8c4bdd60 RDI: ffff8880752fe200 RBP: ffff8880752fe200 R08: 00000000ffffffff R09: 1ffffffff20afb46 R10: dffffc0000000000 R11: fffffbfff20afb47 R12: 0000000000000000 R13: ffff888066e81800 R14: ffff8880752fe200 R15: 0000000000000003 FS: 00007f59a15ec6c0(0000) GS:ffff888125036000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8cd675da08 CR3: 000000006f27f000 CR4: 0000000000350ef0 Call Trace: cleanup_ei fs/tracefs/event_inode.c:150 [inline] eventfs_create_events_dir+0x7c4/0x9f0 fs/tracefs/event_inode.c:834 create_event_toplevel_files+0x11e/0x1a0 kernel/trace/trace_events.c:4593 event_trace_add_tracer+0x8a/0x3b0 kernel/trace/trace_events.c:4624 trace_array_create_dir+0x77/0x160 kernel/trace/trace.c:8548 trace_array_create_systems+0xb3c/0xe60 kernel/trace/trace.c:8639 trace_array_create kernel/trace/trace.c:8666 [inline] instance_mkdir+0xd5/0x140 kernel/trace/trace.c:8681 tracefs_syscall_mkdir+0x11a/0x190 fs/tracefs/inode.c:121 vfs_mkdir+0x40c/0x620 fs/namei.c:5410 filename_mkdirat+0x285/0x510 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f59a079e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f59a15ec028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f59a0a25fa0 RCX: 00007f59a079e0d9 RDX: 00000000000001ff RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007f59a0835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f59a0a26038 R14: 00007f59a0a25fa0 R15: 00007ffde26bcc48 --- 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 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