================================================================== BUG: KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_log_wait_commit write to 0xffff88810385cbf0 of 4 bytes by task 4813 on cpu 0: jbd2_journal_commit_transaction+0x2855/0x3290 fs/jbd2/commit.c:1154 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:294 read to 0xffff88810385cbf0 of 4 bytes by task 9992 on cpu 1: jbd2_log_wait_commit+0xb3/0x200 fs/jbd2/journal.c:712 jbd2_complete_transaction+0xf5/0x100 fs/jbd2/journal.c:846 ext4_fc_commit+0x238/0x18d0 fs/ext4/fast_commit.c:1211 ext4_fsync_journal fs/ext4/fsync.c:115 [inline] ext4_sync_file+0x336/0x6e0 fs/ext4/fsync.c:174 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2843 [inline] ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:277 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502 call_write_iter include/linux/fs.h:1977 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1319 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9992 Comm: syz-executor.4 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================