================================================================== BUG: KCSAN: data-race in mm_update_next_owner / stop_this_handle write to 0xffff8880163be02c of 4 bytes by task 8421 on cpu 0: 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_unlink+0x259/0x3f0 fs/ext4/namei.c:3288 vfs_unlink+0x232/0x3c0 fs/namei.c:3835 do_unlinkat+0x28a/0x4d0 fs/namei.c:3899 __do_sys_unlink fs/namei.c:3945 [inline] __se_sys_unlink fs/namei.c:3943 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880163be02c of 4 bytes by task 13242 on cpu 1: 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+0xce/0x180 kernel/exit.c:922 get_signal+0xdce/0x14e0 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x11a/0x1b0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 13242 Comm: syz-executor.3 Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================