From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 46F7E42C51D for ; Fri, 14 Aug 2026 08:59:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786697975; cv=none; b=bJJAI82v2SMhFe4w5AsEs1SZcw9N4SfF2RNvxrPjroIQEgoDW2hFQ1dhRz+MXTcyarIML1UBnkgLUmhhoPygm5RNDHf39ypNWQYlIJmrwXwoBI1PXX90eK/eXRJRAhXFXYwOBgST4pazZEYVeH2gNqM+K+/KCkdB1tHz3lNdrm4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786697975; c=relaxed/simple; bh=NKKwm28G48/HON8PGLtrBAwo+veQl1Lm5LYpbIgZinU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pmkkq1qkSMRMbYAbyE3TzURQRVrXZwsRI4QDq8H5hf4WhUhg65qSNs8Txe2m3FqP6KrsrVLZfVWjMfVd/+9fZGu2FvzCHHLNbTXRLjMp44eeOqr1SlH3U1uFwJD47FfO+lCQdYQzVS5QYZvqI8uPNIDKFxMV5Np1VXy8piuo8ME= 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=209.85.210.77 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-ot1-f77.google.com with SMTP id 46e09a7af769-7f1ddcd241aso1160824a34.0 for ; Fri, 14 Aug 2026 01:59:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786697973; x=1787302773; 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=h8fC/Tv0EhojxsriFVYDUOaebugZ8Tir3LiUkWf7dMY=; b=VgKqU7P91anOvGTYCUSisDdCi1oPEEN4MR1iNOXxIMIeXXm7m6+mjGIxcr1IIBMGrn BYDj543De5iZcaPthgqG7EhFZjj+vkQmGg+Vnt2C+xE8V6B9Wk5O0Lt50Wa0WM1P7SRQ uEdZpa5LqafsDRCaXKp11XEM5Q4Ha5F6vPNecEUuz01XdHH1lITE+z5fxRm2tEmmR/OE F/vxdeIVQvyNBJm5lIoPimjCQhs06lmqdpXDOJEZCtHz+xDYzCkuh4iIJN11x6h5SpJv PNhWBea/eBfr++uCDi7H5/zynMz5/waGuiOS3JLhvXos6b2TnoXcwRiZXJAEshJkmXBc QbgQ== X-Forwarded-Encrypted: i=1; AHgh+RrlhNvwZpT1si0m5+vUAfLa3dZ1EtamXB7eZF3KOW44M3TO/dzsye5xgfIF8YNAMx8ranJDohVfHhZ1tac=@vger.kernel.org X-Gm-Message-State: AOJu0YwgsWnhlchQGRfLCf5JE8af/SQgcY88418Yra0m/6ip6oZIrQuR lkzfFPkDaUaLB3YDAZ8fKstG2s0FP4xDDXqkKSIpQVjKWA1zq5fznEuWQki3mLE4pn9GBLXgIfA U77Uc/SY6UZbW5BRdz+NqOXYS1dZqQhm9JXhvIBGB9QIBpEG8e9Iz5ejpl5E= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1c8a:b0:6b0:dfa2:830b with SMTP id 006d021491bc7-6b0dfa287d6mr680739eaf.12.1786697973142; Fri, 14 Aug 2026 01:59:33 -0700 (PDT) Date: Fri, 14 Aug 2026 01:59:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7ed8f5.91706f20.9568a.0003.GAE@google.com> Subject: [syzbot] [fs?] general protection fault in configfs_symlink 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: 2f1baf1fc892 Merge tag 'trace-v7.2-rc7' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1545f149580000 kernel config: https://syzkaller.appspot.com/x/.config?x=158601bb8cb292dd dashboard link: https://syzkaller.appspot.com/bug?extid=fb804e639c963f8eea9c 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/8dd1ca52ce7b/disk-2f1baf1f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8fdd3c891266/vmlinux-2f1baf1f.xz kernel image: https://storage.googleapis.com/syzbot-assets/c83197355e17/bzImage-2f1baf1f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fb804e639c963f8eea9c@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000016: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7] CPU: 1 UID: 0 PID: 8680 Comm: syz.3.808 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:create_link fs/configfs/symlink.c:81 [inline] RIP: 0010:configfs_symlink+0x5fc/0x1030 fs/configfs/symlink.c:199 Code: 03 42 80 3c 20 00 74 08 48 89 df e8 ae a3 c2 ff 41 bc b0 00 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 86 a3 c2 ff 4d 8b 2c 24 4c 89 ef e8 RSP: 0018:ffffc90006b27c80 EFLAGS: 00010202 RAX: 0000000000000016 RBX: ffff88805b9a9a48 RCX: dffffc0000000000 RDX: 0000000000000006 RSI: ffffffff8d881af0 RDI: 00000000ffffffff RBP: ffffc90006b27d88 R08: ffffffff8faf4f37 R09: 1ffffffff1f5e9e6 R10: dffffc0000000000 R11: fffffbfff1f5e9e7 R12: 00000000000000b0 R13: 0000000000000000 R14: ffffffff8c21fe48 R15: 1ffff92000d64fa0 FS: 00007f70373346c0(0000) GS:ffff888125d45000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff9610f56c8 CR3: 000000005e8fe000 CR4: 00000000003526f0 Call Trace: vfs_symlink+0x18b/0x330 fs/namei.c:5660 filename_symlinkat+0x1cd/0x420 fs/namei.c:5685 __do_sys_symlinkat fs/namei.c:5705 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5700 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f703911e0d9 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:00007f7037334028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f70393a6180 RCX: 00007f703911e0d9 RDX: 0000200000001c00 RSI: ffffffffffffff9c RDI: 0000200000001b00 RBP: 00007f70391b5024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f70393a6218 R14: 00007f70393a6180 R15: 00007ffd2a6d2ad8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:create_link fs/configfs/symlink.c:81 [inline] RIP: 0010:configfs_symlink+0x5fc/0x1030 fs/configfs/symlink.c:199 Code: 03 42 80 3c 20 00 74 08 48 89 df e8 ae a3 c2 ff 41 bc b0 00 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 86 a3 c2 ff 4d 8b 2c 24 4c 89 ef e8 RSP: 0018:ffffc90006b27c80 EFLAGS: 00010202 RAX: 0000000000000016 RBX: ffff88805b9a9a48 RCX: dffffc0000000000 RDX: 0000000000000006 RSI: ffffffff8d881af0 RDI: 00000000ffffffff RBP: ffffc90006b27d88 R08: ffffffff8faf4f37 R09: 1ffffffff1f5e9e6 R10: dffffc0000000000 R11: fffffbfff1f5e9e7 R12: 00000000000000b0 R13: 0000000000000000 R14: ffffffff8c21fe48 R15: 1ffff92000d64fa0 FS: 00007f70373346c0(0000) GS:ffff888125d45000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3f0968 CR3: 000000005e8fe000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 03 42 80 add -0x80(%rdx),%eax 3: 3c 20 cmp $0x20,%al 5: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 9: 89 df mov %ebx,%edi b: e8 ae a3 c2 ff call 0xffc2a3be 10: 41 bc b0 00 00 00 mov $0xb0,%r12d 16: 4c 03 23 add (%rbx),%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 86 a3 c2 ff call 0xffc2a3be 38: 4d 8b 2c 24 mov (%r12),%r13 3c: 4c 89 ef mov %r13,%rdi 3f: e8 .byte 0xe8 --- 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