================================================================== BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used write to 0xffff8881010ce914 of 4 bytes by task 23129 on cpu 0: mb_mark_used+0x13b/0xc50 fs/ext4/mballoc.c:1947 ext4_mb_use_best_found+0x102/0x320 fs/ext4/mballoc.c:2019 ext4_mb_simple_scan_group+0x253/0x3a0 fs/ext4/mballoc.c:2297 ext4_mb_regular_allocator+0x1984/0x2530 fs/ext4/mballoc.c:2773 ext4_mb_new_blocks+0x792/0x1fc0 fs/ext4/mballoc.c:5586 ext4_ext_map_blocks+0x15ed/0x1ff0 fs/ext4/extents.c:4250 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_iomap_alloc fs/ext4/inode.c:3368 [inline] ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3418 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74 __iomap_dio_rw+0x698/0x1010 fs/iomap/direct-io.c:568 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 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+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 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 0xffff8881010ce914 of 4 bytes by task 23201 on cpu 1: ext4_mb_find_by_goal+0x13a/0x8a0 fs/ext4/mballoc.c:2207 ext4_mb_regular_allocator+0x130/0x2530 fs/ext4/mballoc.c:2654 ext4_mb_new_blocks+0x792/0x1fc0 fs/ext4/mballoc.c:5586 ext4_ext_map_blocks+0x15ed/0x1ff0 fs/ext4/extents.c:4250 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_iomap_alloc fs/ext4/inode.c:3368 [inline] ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3418 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74 __iomap_dio_rw+0x698/0x1010 fs/iomap/direct-io.c:568 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 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+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 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: 0x00007725 -> 0x00007715 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 23201 Comm: syz-executor.0 Tainted: G W 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.0 (23201) used greatest stack depth: 9648 bytes left