================================================================== BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks write to 0xffff8881010dbb54 of 4 bytes by task 24228 on cpu 0: mb_free_blocks+0x156/0xb40 fs/ext4/mballoc.c:1802 ext4_free_blocks+0x14ea/0x1c20 fs/ext4/mballoc.c:6061 ext4_remove_blocks+0x61a/0x800 fs/ext4/extents.c:2506 ext4_ext_rm_leaf+0x684/0xd40 fs/ext4/extents.c:2672 ext4_ext_remove_space+0x8f6/0x12b0 fs/ext4/extents.c:2920 ext4_ext_truncate+0xfe/0x170 fs/ext4/extents.c:4382 ext4_truncate+0x76e/0xa80 fs/ext4/inode.c:4268 ext4_evict_inode+0xa54/0xdb0 fs/ext4/inode.c:287 evict+0x1c8/0x3c0 fs/inode.c:586 iput_final fs/inode.c:1662 [inline] iput+0x430/0x580 fs/inode.c:1688 dentry_unlink_inode+0x273/0x290 fs/dcache.c:376 d_delete+0x78/0xe0 fs/dcache.c:2505 vfs_rmdir+0x2e6/0x300 fs/namei.c:3984 do_rmdir+0x18d/0x330 fs/namei.c:4032 __do_sys_rmdir fs/namei.c:4051 [inline] __se_sys_rmdir fs/namei.c:4049 [inline] __x64_sys_rmdir+0x2c/0x30 fs/namei.c:4049 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 0xffff8881010dbb54 of 4 bytes by task 27316 on cpu 1: ext4_mb_good_group_nolock fs/ext4/mballoc.c:2504 [inline] ext4_mb_regular_allocator+0xaf9/0x2530 fs/ext4/mballoc.c:2747 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_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4437 ext4_fallocate+0x2a7/0x4d0 fs/ext4/extents.c:4718 vfs_fallocate+0x459/0x6a0 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0x75/0xc0 fs/open.c:336 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: 0x00005809 -> 0x0000580a Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27316 Comm: syz-executor.0 Tainted: G W 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================