EXT4-fs (loop1): stripe (65535) is not aligned with cluster size (16), stripe is disabled
EXT4-fs (loop1): invalid journal inode
==================================================================
BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d26fd0 of 8 bytes by task 11970 on cpu 1:
 bh_lru_install fs/buffer.c:1345 [inline]
 find_get_block_common+0x4f0/0x960 fs/buffer.c:1410
 __find_get_block_nonatomic fs/buffer.c:1429 [inline]
 bdev_getblk+0x83/0x3b0 fs/buffer.c:1453
 __bread_gfp+0x51/0x250 fs/buffer.c:1515
 sb_bread include/linux/buffer_head.h:346 [inline]
 fat_ent_bread+0xc9/0x1a0 fs/fat/fatent.c:109
 fat_ent_read+0x3b3/0x5c0 fs/fat/fatent.c:368
 fat_get_cluster+0x4b2/0x7b0 fs/fat/cache.c:266
 fat_free fs/fat/file.c:346 [inline]
 fat_truncate_blocks+0x27d/0x550 fs/fat/file.c:394
 fat_write_failed fs/fat/inode.c:218 [inline]
 fat_write_end+0xba/0x160 fs/fat/inode.c:246
 generic_perform_write+0x312/0x490 mm/filemap.c:4276
 __generic_file_write_iter+0x9e/0x120 mm/filemap.c:4372
 generic_file_write_iter+0x8d/0x2f0 mm/filemap.c:4398
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x52a/0x960 fs/read_write.c:686
 ksys_write+0xda/0x1a0 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:746
 x64_sys_call+0x2802/0x3000 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26fd0 of 8 bytes by task 11968 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1551
 cpu_needs_drain mm/swap.c:787 [inline]
 __lru_add_drain_all+0x287/0x450 mm/swap.c:877
 lru_add_drain_all+0x10/0x20 mm/swap.c:893
 invalidate_bdev+0x47/0x70 block/bdev.c:101
 __ext4_fill_super fs/ext4/super.c:5711 [inline]
 ext4_fill_super+0x2d2c/0x3810 fs/ext4/super.c:5736
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1698
 get_tree_bdev+0x1f/0x30 fs/super.c:1721
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5768
 vfs_get_tree+0x57/0x1d0 fs/super.c:1758
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3642 [inline]
 do_new_mount+0x24d/0x660 fs/namespace.c:3718
 path_mount+0x4a5/0xb70 fs/namespace.c:4028
 do_mount fs/namespace.c:4041 [inline]
 __do_sys_mount fs/namespace.c:4229 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4206
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4206
 x64_sys_call+0x2b51/0x3000 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff8881073ee3a8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 11968 Comm: syz.1.786 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
==================================================================
loop1: detected capacity change from 0 to 512
EXT4-fs (loop1): feature flags set on rev 0 fs, running e2fsck is recommended
EXT4-fs warning (device loop1): ext4_update_dynamic_rev:1137: updating to rev 1 because of new feature flag, running e2fsck is recommended
EXT4-fs error (device loop1): ext4_validate_block_bitmap:441: comm syz.1.786: bg 0: block 248: padding at end of block bitmap is not set
EXT4-fs error (device loop1): ext4_acquire_dquot:6945: comm syz.1.786: Failed to acquire dquot type 1
EXT4-fs (loop1): 1 truncate cleaned up
EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0008-000000000000 r/w without journal. Quota mode: writeback.