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5614622812f47-4896aa7420bmr5603863b6e.19.1781927963509; Fri, 19 Jun 2026 20:59:23 -0700 (PDT) Date: Fri, 19 Jun 2026 20:59:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a36101b.be22b350.2a3e9.0002.GAE@google.com> Subject: [syzbot] [ocfs2?] WARNING in __rt_mutex_slowlock_locked (3) From: syzbot To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b1cbabe84ca1 Merge tag 'for-7.2/dm-changes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b26986580000 kernel config: https://syzkaller.appspot.com/x/.config?x=effd10de8797244 dashboard link: https://syzkaller.appspot.com/bug?extid=ce129763ce7d7e914739 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a7e4ae580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100063b6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/965fde89d8ba/disk-b1cbabe8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6e68a7e15b8d/vmlinux-b1cbabe8.xz kernel image: https://storage.googleapis.com/syzbot-assets/6ffa4967bc81/bzImage-b1cbabe8.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d0c566fd1884/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1344c4ae580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ce129763ce7d7e914739@syzkaller.appspotmail.com ------------[ cut here ]------------ rtmutex deadlock detected WARNING: kernel/locking/rtmutex.c:1698 at rt_mutex_handle_deadlock kernel/locking/rtmutex.c:1698 [inline], CPU#1: syz.2.19/6001 WARNING: kernel/locking/rtmutex.c:1698 at __rt_mutex_slowlock kernel/locking/rtmutex.c:1760 [inline], CPU#1: syz.2.19/6001 WARNING: kernel/locking/rtmutex.c:1698 at __rt_mutex_slowlock_locked+0xeeb/0x25b0 kernel/locking/rtmutex.c:1787, CPU#1: syz.2.19/6001 Modules linked in: CPU: 1 UID: 0 PID: 6001 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:rt_mutex_handle_deadlock kernel/locking/rtmutex.c:1698 [inline] RIP: 0010:__rt_mutex_slowlock kernel/locking/rtmutex.c:1760 [inline] RIP: 0010:__rt_mutex_slowlock_locked+0xeeb/0x25b0 kernel/locking/rtmutex.c:1787 Code: 0d 48 8b bc 24 88 00 00 00 e8 51 1a 7c 09 83 7c 24 40 dd 0f 85 3a 0b 00 00 48 8b 7c 24 18 e8 2c 1b 7c 09 48 8d 3d 45 3a cc 0d <67> 48 0f b9 3a 48 8b 9c 24 80 00 00 00 4c 8b b4 24 90 00 00 00 43 RSP: 0018:ffffc900040f6ae0 EFLAGS: 00010286 RAX: 0000000080000000 RBX: ffff888045214e28 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8b87bf80 RDI: ffffffff8f6c4fb0 RBP: ffffc900040f6cb0 R08: ffffffff8f692af7 R09: 1ffffffff1ed255e R10: dffffc0000000000 R11: fffffbfff1ed255f R12: ffff88803bd7f550 R13: ffff88803bd7dd18 R14: ffff888045213d68 R15: dffffc0000000000 FS: 00007f5edd08e6c0(0000) GS:ffff88812647d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000293cc000 CR4: 00000000003526f0 Call Trace: rt_mutex_slowlock+0xbd/0x170 kernel/locking/rtmutex.c:1827 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline] rwbase_write_lock+0x14c/0x720 kernel/locking/rwbase_rt.c:251 inode_lock include/linux/fs.h:1029 [inline] ocfs2_del_inode_from_orphan+0x12e/0x7b0 fs/ocfs2/namei.c:2728 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2379 [inline] ocfs2_dio_end_io+0xfe3/0x13b0 fs/ocfs2/aops.c:2418 dio_complete+0x254/0x760 fs/direct-io.c:281 __blockdev_direct_IO+0x2d43/0x33d0 fs/direct-io.c:1296 ocfs2_direct_IO+0x24b/0x2c0 fs/ocfs2/aops.c:2455 generic_file_direct_write+0x1d1/0x3f0 mm/filemap.c:4270 __generic_file_write_iter+0x120/0x240 mm/filemap.c:4439 ocfs2_file_write_iter+0x1709/0x1f20 fs/ocfs2/file.c:2476 do_iter_readv_writev+0x624/0x8d0 fs/read_write.c:-1 vfs_writev+0x34c/0x990 fs/read_write.c:1058 do_pwritev fs/read_write.c:1154 [inline] __do_sys_pwritev2 fs/read_write.c:1212 [inline] __se_sys_pwritev2+0x17a/0x2a0 fs/read_write.c:1203 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: 0033:0x7f5edda2ce59 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:00007f5edd08e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f5eddca5fa0 RCX: 00007f5edda2ce59 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000004 RBP: 00007f5eddac2d6f R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000005a00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5eddca6038 R14: 00007f5eddca5fa0 R15: 00007ffef8036c98 ---------------- Code disassembly (best guess): 0: 0d 48 8b bc 24 or $0x24bc8b48,%eax 5: 88 00 mov %al,(%rax) 7: 00 00 add %al,(%rax) 9: e8 51 1a 7c 09 call 0x97c1a5f e: 83 7c 24 40 dd cmpl $0xffffffdd,0x40(%rsp) 13: 0f 85 3a 0b 00 00 jne 0xb53 19: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi 1e: e8 2c 1b 7c 09 call 0x97c1b4f 23: 48 8d 3d 45 3a cc 0d lea 0xdcc3a45(%rip),%rdi # 0xdcc3a6f * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 8b 9c 24 80 00 00 mov 0x80(%rsp),%rbx 36: 00 37: 4c 8b b4 24 90 00 00 mov 0x90(%rsp),%r14 3e: 00 3f: 43 rex.XB --- 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