From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa2-f1.google.com (mail-oa2-f1.google.com [74.125.231.65]) (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 C69703859C3 for ; Tue, 8 Sep 2026 07:08:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788851307; cv=none; b=ajY+20xIuuzSq3NP13vCsftSJQHq0wxp7vSygrOliHk6v/rYisBXT1tawPN1dIfNuCdlxKeTw70YXYeiVeN1f95D0mvW+SKqadITcmTwO3k9oNJXlPAuJAm0HTzixy653/7qaPHRvZSUNI2KLnSv8J2Ts+SpSMK/QObsDbdMxd0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788851307; c=relaxed/simple; bh=VjjRAi7oBGcBtLljLBiLc+MTVU7w3NBnfN+wIzcEqfo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=fWB9nNd/g4UeWU92sDBzBTJlek5ANAOrCmCwM209RtLgUqpza+5+3FOwicgamSSTZiG52KIgpCx9Byyi8SHIa/OQbEZR8yeMCwJ7d3O9TE5E1czaxG9axUQowFp9tyJSl+Io15saZ/7x8Uc3avTgFyqR9kdFmDAw7QRVrWo8wKc= 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=74.125.231.65 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-oa2-f1.google.com with SMTP id 586e51a60fabf-448a12ddfb4so2015634fac.1 for ; Tue, 08 Sep 2026 00:08:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788851305; x=1789456105; 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=SRv6I7fY9tO4zDn70XoEsC2tkr/GJjwF3CkkS/r/sac=; b=VJ8pTTkke81b+fe0c7RMshpHudGQgEdNjKTbaxFUqVRd6+x+qPtwhwHDCZMQ+EyeVt nlY1DRT+HFpECXZpdS+uK8gCCWWs3sVmvbZSF1/7h9YVPWVkg62fMSYI55zKW8qsgSKz D1DOYvcWo+Pm0lPQenxvdalD53QsUaOzb1N71ZGLB7SAk/6E5DQrxbodSfSqDj+45lJr YmV/Yxv9LZg9TOG1UX+oJzhM4OT7sP3xkDSZyQTje758c1tOtJutkwvinKCGVzgJXJof irvUYR1w0IHyf13ufS+x4IgbPtprRZXSczf9QyvjX8krOrteq2Siel10MkMtiMDWxHJ2 vvlw== X-Forwarded-Encrypted: i=1; AKwUvBzS5J+/ig/egL3DWO1V8pRu6tonvYAU+92Fk/iHTO8gXisD/JYylfVKuBVJ8f2xGLzyg0LrO3U3kLg2P9zu@vger.kernel.org X-Gm-Message-State: AFuF++kEtngb7ite4mzhJfXaYHkTBleASiWI+kMvdY/xY5CRjlaC19aY ULoFiGAx96qZ2lT0MGqW+Ae4CYSEE9Spse1jatjYK7K5ZLHIZfLNr+yuMlrpapg/SaLwEjaUuWZ L8XJ2nG9Pk+Rc7r7hhOtUfANdsmsahP7E3/crw4GpceibfTb3jmzWOYDTYZA= Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:e909:0:b0:6b1:9f9d:7a00 with SMTP id 006d021491bc7-6b6fbdc70efmr27895020eaf.5.1788851304811; Tue, 08 Sep 2026 00:08:24 -0700 (PDT) Date: Tue, 08 Sep 2026 00:08:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9fb468.6e6c5f9e.28f11f.000a.GAE@google.com> Subject: [syzbot] [fs?] general protection fault in configfs_depend_item_unlocked From: syzbot To: a.hindborg@kernel.org, leitao@debian.org, linux-fsdevel@vger.kernel.org, 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: 1fc5a74b108f Merge tag 'kmalloc_obj-v7.3-rc2' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17299b49580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30 dashboard link: https://syzkaller.appspot.com/bug?extid=a9efa71b884a23e74153 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/90e25e7ccbef/disk-1fc5a74b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4e7b78b56aee/vmlinux-1fc5a74b.xz kernel image: https://storage.googleapis.com/syzbot-assets/c2f010471672/bzImage-1fc5a74b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a9efa71b884a23e74153@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 1 UID: 0 PID: 6141 Comm: syz.3.68 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:configfs_depend_item_unlocked+0x96/0x420 fs/configfs/dir.c:1246 Code: df e8 1e 88 00 00 89 c5 31 ff 89 c6 e8 13 58 56 ff 85 ed 74 0a e8 fa 52 56 ff 4d 89 fd eb 6c 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 ee 0f c2 ff 4c 8b 6b 60 48 89 df e8 e2 87 RSP: 0018:ffffc90005477ad8 EFLAGS: 00010206 RAX: 000000000000000c RBX: 0000000000000000 RCX: ffff888026a51f40 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000060 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f63c30 R12: ffffffff8ecb12e0 R13: 1ffff92000a8ef6c R14: dffffc0000000000 R15: ffff888061ee3c00 FS: 00007ff7e9de66c0(0000) GS:ffff888125cd4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000016c0 CR3: 000000005eb6a000 CR4: 00000000003526f0 Call Trace: usbg_make_tpg+0x1e0/0x550 drivers/usb/gadget/function/f_tcm.c:1692 target_fabric_make_tpg+0xa8/0x6d0 drivers/target/target_core_fabric_configfs.c:947 configfs_mkdir+0x4f6/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x408/0x620 fs/namei.c:5410 filename_mkdirat+0x289/0x520 fs/namei.c:5443 __do_sys_mkdir fs/namei.c:5470 [inline] __se_sys_mkdir+0x34/0x150 fs/namei.c:5467 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: 0033:0x7ff7ebb8e159 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:00007ff7e9de6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ff7ebe15fa0 RCX: 00007ff7ebb8e159 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000200000000600 RBP: 00007ff7ebc25024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff7ebe16038 R14: 00007ff7ebe15fa0 R15: 00007ffc34b91458 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:configfs_depend_item_unlocked+0x96/0x420 fs/configfs/dir.c:1246 Code: df e8 1e 88 00 00 89 c5 31 ff 89 c6 e8 13 58 56 ff 85 ed 74 0a e8 fa 52 56 ff 4d 89 fd eb 6c 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 ee 0f c2 ff 4c 8b 6b 60 48 89 df e8 e2 87 RSP: 0018:ffffc90005477ad8 EFLAGS: 00010206 RAX: 000000000000000c RBX: 0000000000000000 RCX: ffff888026a51f40 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000060 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f63c30 R12: ffffffff8ecb12e0 R13: 1ffff92000a8ef6c R14: dffffc0000000000 R15: ffff888061ee3c00 FS: 00007ff7e9de66c0(0000) GS:ffff888125cd4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005650aabe2588 CR3: 000000005eb6a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 1e 88 00 00 call 0x8823 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 13 58 56 ff call 0xff565823 10: 85 ed test %ebp,%ebp 12: 74 0a je 0x1e 14: e8 fa 52 56 ff call 0xff565313 19: 4d 89 fd mov %r15,%r13 1c: eb 6c jmp 0x8a 1e: 48 8d 7b 60 lea 0x60(%rbx),%rdi 22: 48 89 f8 mov %rdi,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 ee 0f c2 ff call 0xffc21023 35: 4c 8b 6b 60 mov 0x60(%rbx),%r13 39: 48 89 df mov %rbx,%rdi 3c: e8 .byte 0xe8 3d: e2 87 loop 0xffffffc6 --- 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