================================================================== BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent write to 0xffff888126bf3c28 of 8 bytes by task 9578 on cpu 1: ext4_es_lookup_extent+0x3d3/0x510 fs/ext4/extents_status.c:950 ext4_da_map_blocks fs/ext4/inode.c:1871 [inline] ext4_da_get_block_prep+0x159/0xa60 fs/ext4/inode.c:1992 ext4_block_write_begin+0x33e/0xb90 fs/ext4/inode.c:1202 ext4_da_write_begin+0x1da/0x7e0 fs/ext4/inode.c:3122 generic_perform_write+0x136/0x320 mm/filemap.c:3327 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3456 ext4_file_write_iter+0x1fc/0xa40 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888126bf3c28 of 8 bytes by task 9584 on cpu 0: ext4_es_lookup_extent+0x3ba/0x510 fs/ext4/extents_status.c:950 ext4_da_map_blocks fs/ext4/inode.c:1871 [inline] ext4_da_get_block_prep+0x159/0xa60 fs/ext4/inode.c:1992 ext4_block_write_begin+0x33e/0xb90 fs/ext4/inode.c:1202 ext4_da_write_begin+0x1da/0x7e0 fs/ext4/inode.c:3122 generic_perform_write+0x136/0x320 mm/filemap.c:3327 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3456 ext4_file_write_iter+0x1fc/0xa40 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9584 Comm: syz-executor.2 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================