syzbot

loop0: detected capacity change from 0 to 64
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WARNING: CPU: 0 PID: 4458 at fs/buffer.c:1081 mark_buffer_dirty+0x328/0x5c0 fs/buffer.c:1081
Modules linked in:
CPU: 0 PID: 4458 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : mark_buffer_dirty+0x328/0x5c0 fs/buffer.c:1081
lr : mark_buffer_dirty+0x328/0x5c0 fs/buffer.c:1081
sp : ffff8000213c75c0
x29: ffff8000213c75c0 x28: ffff0000cd80e018 x27: 1fffe00019b01c2c
x26: ffff0000ec574c00 x25: ffff0000e5760008 x24: ffff0000c063f658
x23: ffff0000cd80e160 x22: ffff0000c0655d98 x21: dfff800000000000
x20: 0000000000000010 x19: ffff0000c063f658 x18: 0000000000000000
x17: ffff80001835b000 x16: ffff8000082d93d8 x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe000180c7ecb x12: 0000000000ff0100
x11: ff00800008a8f92c x10: 0000000000000000 x9 : ffff800008a8f92c
x8 : ffff0000c40f3780 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff0000ec574e00 x4 : ffff0000e9a64600 x3 : ffff800008a8f634
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 mark_buffer_dirty+0x328/0x5c0 fs/buffer.c:1081
 bfs_move_block fs/bfs/file.c:43 [inline]
 bfs_move_blocks fs/bfs/file.c:56 [inline]
 bfs_get_block+0x478/0x960 fs/bfs/file.c:125
 __block_write_begin_int+0x350/0x1388 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2102
 bfs_write_begin+0x48/0xec fs/bfs/file.c:177
 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862
 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_write+0x12c/0x224 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 3896
hardirqs last  enabled at (3895): [<ffff800008a8f01c>] bh_lru_install fs/buffer.c:1258 [inline]
hardirqs last  enabled at (3895): [<ffff800008a8f01c>] __find_get_block+0xbd0/0xddc fs/buffer.c:1309
hardirqs last disabled at (3896): [<ffff800011a39234>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (3824): [<ffff800008030954>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (3822): [<ffff800008030920>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---