================================================================== BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty write to 0xffff888104a0e68e of 2 bytes by task 3676 on cpu 0: ext4_ext_store_pblock fs/ext4/ext4_extents.h:257 [inline] ext4_ext_insert_extent+0x1b1d/0x2d90 fs/ext4/extents.c:2124 ext4_ext_map_blocks+0x171b/0x20a0 fs/ext4/extents.c:4271 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 mpage_map_one_extent+0x10d/0x3a0 fs/ext4/inode.c:2393 mpage_map_and_submit_extent fs/ext4/inode.c:2446 [inline] ext4_writepages+0xcba/0x1e80 fs/ext4/inode.c:2798 do_writepages+0x1cb/0x320 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:399 [inline] __filemap_fdatawrite_range mm/filemap.c:432 [inline] file_write_and_wait_range+0x132/0x1d0 mm/filemap.c:809 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:182 generic_write_sync include/linux/fs.h:2955 [inline] ext4_buffered_write_iter+0x322/0x380 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x1200 call_write_iter include/linux/fs.h:2161 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888104a0e68c of 4 bytes by task 3672 on cpu 1: ext4_do_update_inode fs/ext4/inode.c:5059 [inline] ext4_mark_iloc_dirty+0xd08/0x16e0 fs/ext4/inode.c:5683 __ext4_mark_inode_dirty+0x4ec/0x5f0 fs/ext4/inode.c:5879 ext4_dirty_inode+0x86/0xa0 fs/ext4/inode.c:5908 __mark_inode_dirty+0x72/0x6c0 fs/fs-writeback.c:2399 mark_inode_dirty include/linux/fs.h:2450 [inline] generic_write_end+0x157/0x180 fs/buffer.c:2202 ext4_da_write_end+0x4de/0x630 fs/ext4/inode.c:3062 generic_perform_write+0x261/0x400 mm/filemap.c:3757 ext4_buffered_write_iter+0x25b/0x380 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x1200 call_write_iter include/linux/fs.h:2161 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000007 -> 0x0000800c Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3672 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================