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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c8ed9b5c02a5 Merge tag 'drm-fixes-2025-09-05' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=178f3a42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=385d836f07b5a70d dashboard link: https://syzkaller.appspot.com/bug?extid=7f94fe3ce0f6613e12b8 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1603f162580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17852962580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c8ed9b5c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a76961649a76/vmlinux-c8ed9b5c.xz kernel image: https://storage.googleapis.com/syzbot-assets/c47f66170b29/bzImage-c8ed9b5c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7f94fe3ce0f6613e12b8@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5719 at fs/buffer.c:1125 __getblk_slow fs/buffer.c:1125 [inline] WARNING: CPU: 0 PID: 5719 at fs/buffer.c:1125 bdev_getblk+0x580/0x660 fs/buffer.c:1461 Modules linked in: CPU: 0 UID: 0 PID: 5719 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__getblk_slow fs/buffer.c:1125 [inline] RIP: 0010:bdev_getblk+0x580/0x660 fs/buffer.c:1461 Code: 26 fb ff ff e8 61 2d 78 ff 48 c7 c7 60 05 9a 8b 48 c7 c6 55 e0 a0 8d 4c 89 fa 4c 89 e9 e8 58 0f e0 fe eb bd e8 41 2d 78 ff 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 48 89 RSP: 0018:ffffc9000d18f6b0 EFLAGS: 00010293 RAX: ffffffff824790bf RBX: ffff888032185098 RCX: ffff888033aaa440 RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000 RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff8217593d R10: 0000000000000406 R11: 0000000000000000 R12: ffff8880321859f0 R13: ffff888032185080 R14: 0000000000000200 R15: 1ffff11006430a13 FS: 00007f265a53c6c0(0000) GS:ffff88808d20c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559033e08008 CR3: 00000000515c2000 CR4: 0000000000352ef0 Call Trace: __bread_gfp+0x89/0x3c0 fs/buffer.c:1515 sb_bread include/linux/buffer_head.h:346 [inline] udf_read_tagged+0xad/0xe00 fs/udf/misc.c:199 udf_check_anchor_block+0x99/0x550 fs/udf/super.c:1912 udf_scan_anchors fs/udf/super.c:1952 [inline] udf_load_vrs+0x6e3/0xf20 fs/udf/super.c:2033 udf_fill_super+0x5ad/0x17a0 fs/udf/super.c:2201 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f265978ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f265a53c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f26599c6090 RCX: 00007f265978ebe9 RDX: 0000200000000080 RSI: 0000200000004a00 RDI: 0000200000000000 RBP: 00007f2659811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002008087 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f26599c6128 R14: 00007f26599c6090 R15: 00007ffe80675be8 --- 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