KCSAN: data-race in ext4_mb_find_by_goal / mb_mark

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used ext4				326	1135d	1690d	0/28	auto-closed as invalid on 2022/01/24 21:39
upstream	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used (3) ext4				2	993d	994d	0/28	closed as invalid on 2022/05/13 11:20

================================================================== BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used write to 0xffff888103816854 of 4 bytes by task 24535 on cpu 0: mb_mark_used+0x13b/0xc50 fs/ext4/mballoc.c:1947 ext4_mb_use_best_found+0x102/0x300 fs/ext4/mballoc.c:2019 ext4_mb_simple_scan_group+0x253/0x3a0 fs/ext4/mballoc.c:2297 ext4_mb_regular_allocator+0x1918/0x24a0 fs/ext4/mballoc.c:2773 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5582 ext4_ext_map_blocks+0x1658/0x2110 fs/ext4/extents.c:4282 ext4_map_blocks+0x757/0xfa0 fs/ext4/inode.c:638 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4467 ext4_fallocate+0x297/0x530 fs/ext4/extents.c:4744 vfs_fallocate+0x486/0x720 fs/open.c:308 do_vfs_ioctl+0x13cb/0x14a0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888103816854 of 4 bytes by task 24527 on cpu 1: ext4_mb_find_by_goal+0x13f/0x880 fs/ext4/mballoc.c:2207 ext4_mb_regular_allocator+0x12b/0x24a0 fs/ext4/mballoc.c:2654 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5582 ext4_ext_map_blocks+0x1658/0x2110 fs/ext4/extents.c:4282 ext4_map_blocks+0x757/0xfa0 fs/ext4/inode.c:638 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4467 ext4_fallocate+0x297/0x530 fs/ext4/extents.c:4744 vfs_fallocate+0x486/0x720 fs/open.c:308 do_vfs_ioctl+0x13cb/0x14a0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00002000 -> 0x00001800 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24527 Comm: syz-executor.5 Not tainted 5.17.0-rc2-syzkaller-00039-g9f7fb8de5d9b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================