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AJvYcCWEkOZIeImdemefx8Asdco9GJMPSDa4JcguywnG0TIeuM5xRqbLRe+NrLWoR1dYfjnp9YyfkTat9owuPAQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwFdbVkL7qdxpUctA/2gPcUL5zLV30J0JD1hv6o/uh16uYmOVGZ 553ZnSn2UplPwdUGk6Lv37OdbOJ6rhFpXnN5qIy0szr+m/v3g1wx2b587YpWGMxJ76Bd+Mt7M++ ewvsAJ488rQhEqlqfPnTMs/Jf7o0Ofc1Vl6TPKqGyI7FCf06YZmAvJAH7Lwg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4c15:b0:676:9ba8:e486 with SMTP id 006d021491bc7-67767198f38mr7030847eaf.21.1771288227606; Mon, 16 Feb 2026 16:30:27 -0800 (PST) Date: Mon, 16 Feb 2026 16:30:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6993b6a3.050a0220.340abe.0775.GAE@google.com> Subject: [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, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 0f2acd3148e0 Merge tag 'm68knommu-for-v7.0' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15331c02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac00553de86d6bf0 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=146b295a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0f2acd31.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b7d134e71e9c/vmlinux-0f2acd31.xz kernel image: https://storage.googleapis.com/syzbot-assets/b18643058ceb/bzImage-0f2acd31.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/bbfed09077d3/mount_1.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=106b295a580000) 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 = 0xffff88804a18c9b8, owner = 0x0, curr 0xffff888000ec2480, list empty WARNING: kernel/locking/rwsem.c:1381 at __up_write kernel/locking/rwsem.c:1380 [inline], CPU#0: syz.0.53/5774 WARNING: kernel/locking/rwsem.c:1381 at up_write+0x2d6/0x410 kernel/locking/rwsem.c:1643, CPU#0: syz.0.53/5774 Modules linked in: CPU: 0 UID: 0 PID: 5774 Comm: syz.0.53 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 c0 eb cc 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 20 ee 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 ea 60 0a 03 e9 67 fd ff ff 48 c7 c1 RSP: 0000:ffffc90006407d80 EFLAGS: 00010246 RAX: ffffffff8bcceba0 RBX: ffff88804a18c9b8 RCX: ffff88804a18c9b8 RDX: 0000000000000000 RSI: ffffffff8bccee20 RDI: ffffffff9014bf50 RBP: ffff88804a18ca10 R08: 0000000000000000 R09: ffff888000ec2480 R10: ffffffff8bcceba0 R11: ffffed1009431939 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88804a18c9b8 R15: 1ffff11009431938 FS: 00007f9e11bfe6c0(0000) GS:ffff88808ca62000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000d54e20 CR3: 0000000041f2c000 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_mkdirat fs/namei.c:5287 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284 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: 0033:0x7f9e10d9bf79 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:00007f9e11bfe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9e11016090 RCX: 00007f9e10d9bf79 RDX: 00000000000001c0 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007f9e10e327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9e11016128 R14: 00007f9e11016090 R15: 00007ffffd54f8b8 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 c7 c2 c0 eb cc 8b mov $0xffffffff8bccebc0,%r10 7: 4c 0f 44 d0 cmove %rax,%r10 b: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 10: 48 c7 c6 20 ee cc 8b mov $0xffffffff8bccee20,%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 ea 60 0a 03 call 0x30a6120 36: e9 67 fd ff ff jmp 0xfffffda2 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c1 .byte 0xc1 --- 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