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kernel BUG at fs/buffer.c:579!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4573 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : mark_buffer_dirty_inode+0x280/0x284 fs/buffer.c:579
lr : mark_buffer_dirty_inode+0x280/0x284 fs/buffer.c:579
sp : ffff8000213e7030
x29: ffff8000213e7040 x28: ffff800011dda8d8 x27: 000000000000042d
x26: 1fffe0001df95806 x25: 0000000000000000 x24: ffff0000f40b8368
x23: dfff800000000000 x22: ffff8000213e7188 x21: 1fffe0001e8170b1
x20: ffff0000f40b8588 x19: ffff0000e23ce910 x18: 1fffe00033e8417e
x17: ffff80001532d000 x16: ffff800011b3e320 x15: ffff00019f420bfc
x14: 0000000000000001 x13: 1fffff80007a2408 x12: 0000000000000000
x11: ff00800008a9d444 x10: 0000000000000000 x9 : ffff800008a9d444
x8 : ffff0000d3725400 x7 : ffff800008944670 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff800008a9d698
x2 : 0000000000000001 x1 : ffff800011c9edc0 x0 : 0000000000000001
Call trace:
 mark_buffer_dirty_inode+0x280/0x284 fs/buffer.c:579
 fat16_ent_put+0xa8/0xd4 fs/fat/fatent.c:184
 fat_alloc_clusters+0x470/0xb48 fs/fat/fatent.c:503
 fat_add_cluster fs/fat/inode.c:108 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x380/0x9a0 fs/fat/inode.c:190
 __block_write_begin_int+0x3d8/0x13c0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin fs/buffer.c:2102 [inline]
 cont_write_begin+0x5b4/0x820 fs/buffer.c:2456
 fat_write_begin+0x98/0x150 fs/fat/inode.c:235
 cont_expand_zero fs/buffer.c:2383 [inline]
 cont_write_begin+0x290/0x820 fs/buffer.c:2446
 fat_write_begin+0x98/0x150 fs/fat/inode.c:235
 generic_cont_expand_simple+0x130/0x208 fs/buffer.c:2347
 fat_cont_expand+0x70/0x1f0 fs/fat/file.c:223
 fat_setattr+0x448/0xedc fs/fat/file.c:513
 notify_change+0xb5c/0xe20 fs/attr.c:499
 do_truncate+0x188/0x20c fs/open.c:65
 do_sys_ftruncate+0x284/0x318 fs/open.c:193
 __do_sys_ftruncate fs/open.c:204 [inline]
 __se_sys_ftruncate fs/open.c:202 [inline]
 __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 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
Code: 9101c3ff d50323bf d65f03c0 97e85477 (d4210000) 
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