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AJvYcCVNi7hEVDsCgCSE52NbX1IplD+66m+8IeprNhMJ7J57lxviGt2UEwoy+rKJD5SkSszYz5PmQq4duLVHQ0s=@vger.kernel.org X-Gm-Message-State: AOJu0Yy2al85qrKRsIY7zOQSG3varhRcYu71g1emQirVe1b6IqSHWFUF oMxKhjccga//VWxbR+wSxX8DSt8Gh0FWEP/rPWcqdBFWYqyEZRQd4lju1m1+UtdUxul3TUk0qyX jhb2NPYBGcJ1H4WLh3VELz+c3y5B8tAiX/fDc8wcqLDtSPHEMVHaD4Hr4eCA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:151b:b0:677:bd4a:8f79 with SMTP id 006d021491bc7-679a71c9a20mr2415713eaf.20.1771485987661; Wed, 18 Feb 2026 23:26:27 -0800 (PST) Date: Wed, 18 Feb 2026 23:26:27 -0800 In-Reply-To: <6993b6a3.050a0220.340abe.0775.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6996bb23.a70a0220.2c38d7.0122.GAE@google.com> Subject: Re: [syzbot] [gfs2?] WARNING in filename_mkdirat From: syzbot To: brauner@kernel.org, gfs2@lists.linux.dev, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, neil@brown.name, neilb@ownmail.net, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 956b9cbd7f15 Merge tag 'kbuild-fixes-7.0-1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14c81ffa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=65722f41f7edc17e dashboard link: https://syzkaller.appspot.com/bug?extid=0ea5108a1f5fb4fcc2d8 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1622495a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1600e95a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-956b9cbd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f0b3757a15ed/vmlinux-956b9cbd.xz kernel image: https://storage.googleapis.com/syzbot-assets/c564e8613b4e/bzImage-956b9cbd.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2e0152c5e6ec/mount_1.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=141eb15a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ea5108a1f5fb4fcc2d8@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88804665f818, owner = 0x0, curr 0xffff888035922480, list empty WARNING: kernel/locking/rwsem.c:1381 at __up_write kernel/locking/rwsem.c:1380 [inline], CPU#0: syz.0.30/5574 WARNING: kernel/locking/rwsem.c:1381 at up_write+0x2d6/0x410 kernel/locking/rwsem.c:1643, CPU#0: syz.0.30/5574 Modules linked in: CPU: 0 UID: 0 PID: 5574 Comm: syz.0.30 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline] RIP: 0010:up_write+0x388/0x410 kernel/locking/rwsem.c:1643 Code: cc 8b 49 c7 c2 80 eb cc 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 e0 ed cc 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 10 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 0a 0c 0b 03 e9 67 fd ff ff 48 c7 c1 RSP: 0018:ffffc90006407d80 EFLAGS: 00010246 RAX: ffffffff8bcceb60 RBX: ffff88804665f818 RCX: ffff88804665f818 RDX: 0000000000000000 RSI: ffffffff8bccede0 RDI: ffffffff9014e210 RBP: ffff88804665f870 R08: 0000000000000000 R09: ffff888035922480 R10: ffffffff8bcceb60 R11: ffffed1008ccbf05 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88804665f818 R15: 1ffff11008ccbf04 FS: 00007fe0f01196c0(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0f0118ff8 CR3: 000000004158f000 CR4: 0000000000352ef0 Call Trace: inode_unlock include/linux/fs.h:1038 [inline] end_dirop fs/namei.c:2947 [inline] end_creating include/linux/namei.h:126 [inline] end_creating_path fs/namei.c:4962 [inline] filename_mkdirat+0x305/0x510 fs/namei.c:5271 __do_sys_mkdir fs/namei.c:5293 [inline] __se_sys_mkdir+0x34/0x150 fs/namei.c:5290 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe0ef19c629 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:00007fe0f0119028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fe0ef416090 RCX: 00007fe0ef19c629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007fe0ef232b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe0ef416128 R14: 00007fe0ef416090 R15: 00007ffff03e4318 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 c7 c2 80 eb cc 8b mov $0xffffffff8bcceb80,%r10 7: 4c 0f 44 d0 cmove %rax,%r10 b: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 10: 48 c7 c6 e0 ed cc 8b mov $0xffffffff8bccede0,%rsi 17: 48 8b 14 24 mov (%rsp),%rdx 1b: 4c 89 f1 mov %r14,%rcx 1e: 4d 89 e0 mov %r12,%r8 21: 4c 8b 4c 24 10 mov 0x10(%rsp),%r9 26: 41 52 push %r10 * 28: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2d: 48 83 c4 08 add $0x8,%rsp 31: e8 0a 0c 0b 03 call 0x30b0c40 36: e9 67 fd ff ff jmp 0xfffffda2 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c1 .byte 0xc1 --- 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.