================================================================== BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru read-write to 0xffff888237c27550 of 8 bytes by task 19539 on cpu 0: bh_lru_install fs/buffer.c:1345 [inline] find_get_block_common+0x4f3/0x950 fs/buffer.c:1410 bdev_getblk+0x4d/0x3f0 include/linux/gfp.h:-1 sb_getblk_gfp include/linux/buffer_head.h:392 [inline] __read_extent_tree_block+0xad/0x470 fs/ext4/extents.c:564 ext4_find_extent+0x4ca/0x7a0 fs/ext4/extents.c:939 ext4_ext_map_blocks+0x11f/0x38a0 fs/ext4/extents.c:4208 ext4_map_create_blocks fs/ext4/inode.c:613 [inline] ext4_map_blocks+0x626/0xd20 fs/ext4/inode.c:816 mpage_map_one_extent fs/ext4/inode.c:2380 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline] ext4_do_writepages+0x15ef/0x27e0 fs/ext4/inode.c:2932 ext4_writepages+0x179/0x300 fs/ext4/inode.c:3026 do_writepages+0x1c6/0x310 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range mm/filemap.c:412 [inline] file_write_and_wait_range+0x156/0x2c0 mm/filemap.c:786 generic_buffers_fsync_noflush+0x45/0x130 fs/buffer.c:609 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x1ab/0x690 fs/ext4/fsync.c:147 vfs_fsync_range+0x10d/0x130 fs/sync.c:188 generic_write_sync include/linux/fs.h:2616 [inline] ext4_buffered_write_iter+0x34f/0x3c0 fs/ext4/file.c:305 ext4_file_write_iter+0x387/0xf60 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x52a/0x960 fs/read_write.c:686 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0xfd/0x150 fs/read_write.c:798 x64_sys_call+0x9f7/0x3000 arch/x86/include/generated/asm/syscalls_64.h:19 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888237c27550 of 8 bytes by task 19569 on cpu 1: 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+0x93/0x170 block/bdev.c:241 ext4_load_super fs/ext4/super.c:5157 [inline] __ext4_fill_super fs/ext4/super.c:5312 [inline] ext4_fill_super+0x1470/0x37a0 fs/ext4/super.c:5777 get_tree_bdev_flags+0x291/0x300 fs/super.c:1691 get_tree_bdev+0x1f/0x30 fs/super.c:1714 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5809 vfs_get_tree+0x57/0x1d0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x24d/0x6a0 fs/namespace.c:3712 path_mount+0x4ab/0xb80 fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4201 __x64_sys_mount+0x67/0x80 fs/namespace.c:4201 x64_sys_call+0x2cca/0x3000 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88811bab00d0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 19569 Comm: syz.7.5140 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== EXT4-fs (loop7): orphan cleanup on readonly fs EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #3: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7): ext4_dirty_inode:6502: inode #3: comm syz.7.5140: mark_inode_dirty error EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #3: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7): __ext4_ext_dirty:206: inode #3: comm syz.7.5140: mark_inode_dirty error EXT4-fs error (device loop7): ext4_acquire_dquot:6986: comm syz.7.5140: Failed to acquire dquot type 0 EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #16: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7): ext4_dirty_inode:6502: inode #16: comm syz.7.5140: mark_inode_dirty error EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #16: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7): __ext4_ext_dirty:206: inode #16: comm syz.7.5140: mark_inode_dirty error EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #16: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7) in ext4_orphan_del:303: Corrupt filesystem EXT4-fs error (device loop7): ext4_do_update_inode:5617: inode #16: comm syz.7.5140: corrupted inode contents EXT4-fs error (device loop7): ext4_truncate:4635: inode #16: comm syz.7.5140: mark_inode_dirty error EXT4-fs error (device loop7) in ext4_process_orphan:345: Corrupt filesystem EXT4-fs (loop7): 1 truncate cleaned up EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: writeback.