================================================================== BUG: KCSAN: data-race in __jbd2_journal_drop_transaction / start_this_handle write to 0xffff8881030ad078 of 8 bytes by task 4558 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_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x58/0xa0 fs/ext4/inode.c:5916 __mark_inode_dirty+0x72/0x6c0 fs/fs-writeback.c:2399 mark_inode_dirty include/linux/fs.h:2451 [inline] generic_write_end+0x157/0x180 fs/buffer.c:2202 ext4_da_write_end+0x4de/0x630 fs/ext4/inode.c:3059 generic_perform_write+0x261/0x400 mm/filemap.c:3767 ext4_buffered_write_iter+0x25b/0x380 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x1200 __kernel_write+0x32e/0x5e0 fs/read_write.c:535 do_acct_process+0xb4d/0xd40 kernel/acct.c:518 slow_acct_process kernel/acct.c:577 [inline] acct_process+0x1ad/0x250 kernel/acct.c:601 do_exit+0x612/0x17a0 kernel/exit.c:822 do_group_exit+0xce/0x180 kernel/exit.c:929 get_signal+0xfc3/0x1550 kernel/signal.c:2852 arch_do_signal_or_restart+0x8c/0x2e0 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x113/0x190 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881030ad078 of 8 bytes by task 1404 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 -> 0xffff88815a861900 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1404 Comm: jbd2/sda1-8 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================