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5614622812f47-489b07888b7mr4987573b6e.26.1781927903592; Fri, 19 Jun 2026 20:58:23 -0700 (PDT) Date: Fri, 19 Jun 2026 20:58:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a360fdf.871e809a.2d6dda.0002.GAE@google.com> Subject: [syzbot] [udf?] WARNING in udf_free_blocks (3) From: syzbot To: jack@suse.com, 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: e771677c937d Merge tag 'for-linus-iommufd' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=135bffec580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4ababa576f9d171 dashboard link: https://syzkaller.appspot.com/bug?extid=6a680377e13041c19d50 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=10bcccfe580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14cfe3a1580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/24dc401a7e7b/disk-e771677c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d8e85f151384/vmlinux-e771677c.xz kernel image: https://storage.googleapis.com/syzbot-assets/7072bfe66fc6/bzImage-e771677c.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/a7804ba81935/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/c40d18e63806/mount_8.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=15645b7a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6a680377e13041c19d50@syzkaller.appspotmail.com ------------[ cut here ]------------ rtmutex deadlock detected WARNING: kernel/locking/rtmutex.c:1698 at rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1698, CPU#1: syz.1.71/6167 Modules linked in: CPU: 1 UID: 0 PID: 6167 Comm: syz.1.71 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+0x21/0xb0 kernel/locking/rtmutex.c:1698 Code: 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 81 00 00 00 48 89 f7 e8 e6 3f 01 00 48 8d 3d 2f 77 6c 04 <67> 48 0f b9 3a 4c 8d 3d 00 00 00 00 65 48 8b 1d 43 1f 4c 07 4c 8d RSP: 0018:ffffc900047be8d0 EFLAGS: 00010286 RAX: 0000000080000000 RBX: 00000000ffffffdd RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8ba7bb00 RDI: ffffffff8f8c97e0 RBP: ffffc900047bea80 R08: ffffffff8f892ef7 R09: 1ffffffff1f125de R10: dffffc0000000000 R11: fffffbfff1f125df R12: 1ffff920008f7d28 R13: ffffffff8b201af2 R14: ffff88804d827110 R15: dffffc0000000000 FS: 00007fc2fb7de6c0(0000) GS:ffff88812625c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f17bfbcda08 CR3: 000000002c6ba000 CR4: 00000000003526f0 Call Trace: __rt_mutex_slowlock kernel/locking/rtmutex.c:1760 [inline] __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline] rt_mutex_slowlock+0x73c/0x780 kernel/locking/rtmutex.c:1827 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline] __mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline] mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:578 udf_table_free_blocks fs/udf/balloc.c:376 [inline] udf_free_blocks+0xa8c/0x1900 fs/udf/balloc.c:678 udf_delete_aext+0x4f5/0xc00 fs/udf/inode.c:2381 udf_table_prealloc_blocks fs/udf/balloc.c:544 [inline] udf_prealloc_blocks+0xbd4/0x10e0 fs/udf/balloc.c:702 udf_prealloc_extents fs/udf/inode.c:1058 [inline] inode_getblk fs/udf/inode.c:916 [inline] udf_map_block+0x1e85/0x4280 fs/udf/inode.c:453 __udf_get_block+0x52/0x250 fs/udf/inode.c:467 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2123 block_write_begin+0x8d/0x120 fs/buffer.c:2234 udf_write_begin+0x11a/0x270 fs/udf/inode.c:261 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4336 __generic_file_write_iter+0x1b1/0x240 mm/filemap.c:4450 udf_file_write_iter+0x2a6/0x630 fs/udf/file.c:112 iter_file_splice_write+0xa36/0x1240 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x104/0x160 fs/splice.c:1159 splice_direct_to_actor+0x586/0xcc0 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1228 do_sendfile+0x540/0x7e0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1432 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 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: 0033:0x7fc2fc17ce59 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:00007fc2fb7de028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fc2fc3f5fa0 RCX: 00007fc2fc17ce59 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007fc2fc212e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc2fc3f6038 R14: 00007fc2fc3f5fa0 R15: 00007ffe10d9c6e8 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 41 57 push %r15 b: 41 56 push %r14 d: 41 55 push %r13 f: 41 54 push %r12 11: 53 push %rbx 12: 83 ff dd cmp $0xffffffdd,%edi 15: 0f 85 81 00 00 00 jne 0x9c 1b: 48 89 f7 mov %rsi,%rdi 1e: e8 e6 3f 01 00 call 0x14009 23: 48 8d 3d 2f 77 6c 04 lea 0x46c772f(%rip),%rdi # 0x46c7759 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 4c 8d 3d 00 00 00 00 lea 0x0(%rip),%r15 # 0x36 36: 65 48 8b 1d 43 1f 4c mov %gs:0x74c1f43(%rip),%rbx # 0x74c1f81 3d: 07 3e: 4c rex.WR 3f: 8d .byte 0x8d --- 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