================================================================== BUG: KCSAN: data-race in __ext4_journal_start_sb / jbd2_journal_update_sb_log_tail write to 0xffff8881023c4000 of 8 bytes by task 4852 on cpu 1: jbd2_journal_update_sb_log_tail+0x134/0x170 fs/jbd2/journal.c:1637 jbd2_journal_commit_transaction+0x1c3/0x32b0 fs/jbd2/commit.c:430 kjournald2+0x263/0x480 fs/jbd2/journal.c:213 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff8881023c4000 of 8 bytes by task 15148 on cpu 0: is_journal_aborted include/linux/jbd2.h:1647 [inline] ext4_journal_check_start fs/ext4/ext4_jbd2.c:82 [inline] __ext4_journal_start_sb+0xed/0x310 fs/ext4/ext4_jbd2.c:98 __ext4_journal_start fs/ext4/ext4_jbd2.h:320 [inline] ext4_dirty_inode+0x78/0xc0 fs/ext4/inode.c:5951 __mark_inode_dirty+0x72/0x6b0 fs/fs-writeback.c:2262 mark_inode_dirty include/linux/fs.h:2181 [inline] generic_write_end+0x166/0x240 fs/buffer.c:2202 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3423 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f0/0x7e0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 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: 15148 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 ==================================================================