================================================================== BUG: KCSAN: data-race in __jbd2_journal_drop_transaction / start_this_handle write to 0xffff888102a2c078 of 8 bytes by task 32705 on cpu 0: jbd2_get_transaction fs/jbd2/transaction.c:125 [inline] start_this_handle+0xd37/0x1050 fs/jbd2/transaction.c:416 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x159/0x310 fs/ext4/ext4_jbd2.c:105 __ext4_new_inode+0xd95/0x2fc0 fs/ext4/ialloc.c:1080 ext4_mkdir+0x28a/0x760 fs/ext4/namei.c:2929 vfs_mkdir+0x2c8/0x3d0 fs/namei.c:3883 do_mkdirat+0x12e/0x2c0 fs/namei.c:3909 __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __x64_sys_mkdir+0x40/0x50 fs/namei.c:3927 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 0xffff888102a2c078 of 8 bytes by task 348 on cpu 1: __jbd2_journal_drop_transaction+0x1f0/0x2f0 fs/jbd2/checkpoint.c:803 __jbd2_journal_remove_checkpoint+0x2d5/0x3a0 fs/jbd2/checkpoint.c:734 jbd2_journal_commit_transaction+0x23f1/0x3460 fs/jbd2/commit.c:1019 kjournald2+0x263/0x480 fs/jbd2/journal.c:213 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 value changed: 0x0000000000000000 -> 0xffff888104b97600 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 348 Comm: jbd2/sda1-8 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================