================================================================== BUG: KCSAN: data-race in mm_update_next_owner / stop_this_handle write to 0xffff88810241a02c of 4 bytes by task 8431 on cpu 1: memalloc_nofs_restore include/linux/sched/mm.h:258 [inline] stop_this_handle+0x2ae/0x2f0 fs/jbd2/transaction.c:744 jbd2_journal_stop+0x573/0x6d0 fs/jbd2/transaction.c:1907 __ext4_journal_stop+0x99/0x110 fs/ext4/ext4_jbd2.c:127 ext4_mkdir+0x2e0/0x750 fs/ext4/namei.c:2834 vfs_mkdir+0x288/0x350 fs/namei.c:3652 do_mkdirat+0x132/0x220 fs/namei.c:3675 __do_sys_mkdir fs/namei.c:3691 [inline] __se_sys_mkdir fs/namei.c:3689 [inline] __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810241a02c of 4 bytes by task 4733 on cpu 0: mm_update_next_owner+0x1d9/0x4e0 kernel/exit.c:388 exit_mm+0x337/0x430 kernel/exit.c:500 do_exit+0x41f/0x1690 kernel/exit.c:812 do_group_exit+0x17d/0x180 kernel/exit.c:922 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 4733 Comm: syz-executor.1 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================