loop0: detected capacity change from 0 to 164
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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d26fd0 of 8 bytes by task 14376 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
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 __ext4_get_inode_loc+0x303/0x930 fs/ext4/inode.c:4837
 ext4_get_inode_loc fs/ext4/inode.c:4965 [inline]
 ext4_reserve_inode_write+0xd7/0x250 fs/ext4/inode.c:6302
 __ext4_mark_inode_dirty+0x8c/0x3f0 fs/ext4/inode.c:6480
 ext4_dirty_inode+0x92/0xc0 fs/ext4/inode.c:6517
 __mark_inode_dirty+0x162/0x750 fs/fs-writeback.c:2566
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2118 [inline]
 touch_atime+0x229/0x340 fs/inode.c:2190
 file_accessed include/linux/fs.h:2673 [inline]
 ext4_file_mmap_prepare+0x13a/0x1a0 fs/ext4/file.c:828
 vfs_mmap_prepare include/linux/fs.h:2410 [inline]
 call_mmap_prepare mm/vma.c:2586 [inline]
 __mmap_region mm/vma.c:2654 [inline]
 mmap_region+0x8d2/0x1620 mm/vma.c:2740
 do_mmap+0x9b3/0xbe0 mm/mmap.c:558
 vm_mmap_pgoff+0x17a/0x2e0 mm/util.c:581
 ksys_mmap_pgoff+0x268/0x310 mm/mmap.c:604
 x64_sys_call+0x14a3/0x3000 arch/x86/include/generated/asm/syscalls_64.h:10
 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 14374 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1551
 smp_call_function_many_cond+0x2a9/0xc60 kernel/smp.c:821
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1043
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1560
 kill_bdev block/bdev.c:90 [inline]
 set_blocksize+0x24f/0x310 block/bdev.c:207
 sb_set_blocksize+0x7a/0x100 block/bdev.c:224
 isofs_fill_super+0xa73/0x1270 fs/isofs/inode.c:816
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1691
 get_tree_bdev+0x1f/0x30 fs/super.c:1714
 isofs_get_tree+0x1c/0x30 fs/isofs/inode.c:1533
 vfs_get_tree+0x57/0x1d0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x24d/0x660 fs/namespace.c:3727
 path_mount+0x4a5/0xb70 fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4215
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4215
 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: 0xffff8881072210d0 -> 0xffff88810720dd00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14374 Comm: syz.0.3411 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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