syzbot

EXT4-fs error (device loop0): ext4_mb_mark_diskspace_used:4215: comm syz.0.17: Allocating blocks 1-17 which overlap fs metadata
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kernel BUG at fs/ext4/mballoc.c:4787!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6069 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787
Code: e8 74 7e ad ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 00 45 4b ff 90 0f 0b e8 f8 44 4b ff 90 0f 0b e8 f0 44 4b ff 90 <0f> 0b e8 e8 44 4b ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90004e4f3c8 EFLAGS: 00010293
RAX: ffffffff827467d0 RBX: 00000000ffffffff RCX: ffff888026db1e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff1100604d6ef R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10081f9618 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff110081f961a R15: ffff888040fcb0d0
FS:  000055558c741500(0000) GS:ffff888126dee000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586505f2950 CR3: 0000000043998000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x669/0x1410 fs/ext4/mballoc.c:5004
 ext4_mb_new_blocks+0x5a1/0x46b0 fs/ext4/mballoc.c:6308
 ext4_ext_map_blocks+0x1877/0x69c0 fs/ext4/extents.c:4383
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x82c/0x16f0 fs/ext4/inode.c:816
 ext4_alloc_file_blocks+0x425/0xdd0 fs/ext4/extents.c:4551
 ext4_zero_range+0x38d/0xb90 fs/ext4/extents.c:4644
 ext4_fallocate+0x340/0x3d0 fs/ext4/extents.c:4832
 vfs_fallocate+0x672/0x7f0 fs/open.c:339
 ksys_fallocate fs/open.c:363 [inline]
 __do_sys_fallocate fs/open.c:368 [inline]
 __se_sys_fallocate fs/open.c:366 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:366
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f34f2f749
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:00007ffef4af0c08 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f1f35185fa0 RCX: 00007f1f34f2f749
RDX: 0000000000000fff RSI: 0000000000000011 RDI: 0000000000000004
RBP: 00007f1f34fb3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f35185fa0 R14: 00007f1f35185fa0 R15: 0000000000000004
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787
Code: e8 74 7e ad ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 00 45 4b ff 90 0f 0b e8 f8 44 4b ff 90 0f 0b e8 f0 44 4b ff 90 <0f> 0b e8 e8 44 4b ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90004e4f3c8 EFLAGS: 00010293
RAX: ffffffff827467d0 RBX: 00000000ffffffff RCX: ffff888026db1e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff1100604d6ef R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10081f9618 R12: 0000000000000004
R13: 0000000000000002 R14: 1ffff110081f961a R15: ffff888040fcb0d0
FS:  000055558c741500(0000) GS:ffff888126dee000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586505f2950 CR3: 0000000043998000 CR4: 00000000003526f0