================================================================== BUG: KCSAN: data-race in __jbd2_journal_drop_transaction / start_this_handle write to 0xffff888102afd078 of 8 bytes by task 9420 on cpu 0: jbd2_get_transaction fs/jbd2/transaction.c:125 [inline] start_this_handle+0xf1b/0x1250 fs/jbd2/transaction.c:416 jbd2__journal_start+0x1fc/0x3b0 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x159/0x2d0 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:5905 __mark_inode_dirty+0x77/0x6a0 fs/fs-writeback.c:2398 mark_inode_dirty include/linux/fs.h:2452 [inline] generic_write_end+0x157/0x180 fs/buffer.c:2202 ext4_da_write_end+0x4cc/0x5e0 fs/ext4/inode.c:3062 generic_perform_write+0x251/0x3e0 mm/filemap.c:3781 ext4_buffered_write_iter+0x305/0x400 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7bc/0x900 fs/read_write.c:594 ksys_write+0xd9/0x190 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:656 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 0xffff888102afd078 of 8 bytes by task 343 on cpu 1: __jbd2_journal_drop_transaction+0x1f0/0x2c0 fs/jbd2/checkpoint.c:803 __jbd2_journal_remove_checkpoint+0x2d5/0x370 fs/jbd2/checkpoint.c:734 jbd2_journal_commit_transaction+0x246e/0x3430 fs/jbd2/commit.c:1019 kjournald2+0x268/0x490 fs/jbd2/journal.c:213 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 value changed: 0x0000000000000000 -> 0xffff88813195e600 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 343 Comm: jbd2/sda1-8 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================