================================================================== BUG: KCSAN: data-race in ext4_fc_commit / ext4_fc_commit write to 0xffff8881026ab710 of 8 bytes by task 13593 on cpu 0: ext4_fc_commit+0x1fa/0x19d0 fs/ext4/fast_commit.c:1205 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:2737 [inline] ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [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+0x41a/0x770 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 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:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881026ab710 of 8 bytes by task 13584 on cpu 1: ext4_fc_commit+0x1c8/0x19d0 fs/ext4/fast_commit.c:1205 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:2737 [inline] ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [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+0x41a/0x770 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 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:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 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: 1 PID: 13584 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 ==================================================================