[bug report] Internal error isnullstartblock(got.br_startblock) a t line 6005 of file fs/xfs/libxfs/xfs_bmap.c.

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Hi,
I get a xfs error when run xfstests  generic/461 testing with
linux-block for-next branch.
looks it easy to reproduce with s390x arch.

kernel info :
commit 04d3822ddfd11fa2c9b449c977f340b57996ef3d
6.9.0+
reproducer
git clone xfstests
 ./check generic/461


[ 5322.046654] XFS (loop1): Internal error isnullstartblock(got.br_startblock) a
t line 6005 of file fs/xfs/libxfs/xfs_bmap.c.  Caller xfs_bmap_insert_extents+0x
2ee/0x420 [xfs]
[ 5322.046859] CPU: 0 PID: 157526 Comm: fsstress Kdump: loaded Not tainted 6.9.0
+ #1
[ 5322.046863] Hardware name: IBM 8561 LT1 400 (z/VM 7.2.0)
[ 5322.046864] Call Trace:
[ 5322.046866]  [<0000022f504d8fc4>] dump_stack_lvl+0x8c/0xb0
[ 5322.046876]  [<0000022ed00fc308>] xfs_corruption_error+0x70/0xa0 [xfs]
[ 5322.046955]  [<0000022ed00b7206>] xfs_bmap_insert_extents+0x3fe/0x420 [xfs]
[ 5322.047024]  [<0000022ed00f55a6>] xfs_insert_file_space+0x1be/0x248 [xfs]
[ 5322.047105]  [<0000022ed00ff1dc>] xfs_file_fallocate+0x244/0x400 [xfs]
[ 5322.047186]  [<0000022f4fe90000>] vfs_fallocate+0x218/0x338
[ 5322.047190]  [<0000022f4fe9112e>] ksys_fallocate+0x56/0x98
[ 5322.047193]  [<0000022f4fe911aa>] __s390x_sys_fallocate+0x3a/0x48
[ 5322.047196]  [<0000022f505019d2>] __do_syscall+0x23a/0x2c0
[ 5322.047200]  [<0000022f50511d20>] system_call+0x70/0x98
[ 5322.054644] XFS (loop1): Corruption detected. Unmount and run xfs_repair
[ 5322.977488] XFS (loop1): User initiated shutdown received.
[ 5322.977505] XFS (loop1): Log I/O Error (0x6) detected at xfs_fs_goingdown+0xb
4/0xf8 [xfs] (fs/xfs/xfs_fsops.c:458).  Shutting down filesystem.
[ 5322.977772] XFS (loop1): Please unmount the filesystem and rectify the proble
m(s)
[ 5322.977877] loop1: writeback error on inode 755831, offset 32768, sector 1804
712
00:00:00





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