================================================================== BUG: KCSAN: data-race in __ext4_journal_start_sb / jbd2_journal_commit_transaction write to 0xffff888106135800 of 8 bytes by task 4853 on cpu 1: jbd2_journal_commit_transaction+0x238/0x32b0 fs/jbd2/commit.c:443 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 0xffff888106135800 of 8 bytes by task 25522 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 generic_update_time fs/inode.c:1763 [inline] update_time fs/inode.c:1776 [inline] touch_atime+0x1b1/0x2d0 fs/inode.c:1847 file_accessed include/linux/fs.h:2218 [inline] generic_file_buffered_read+0x945/0x9c0 mm/filemap.c:2556 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 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: 25522 Comm: syz-executor.4 Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================