================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match write to 0xffff888128f93780 of 8 bytes by task 10949 on cpu 1: other_inode_match fs/ext4/inode.c:4829 [inline] other_inode_match+0x13c/0x5c0 fs/ext4/inode.c:4813 find_inode_nowait+0x135/0x160 fs/inode.c:1437 ext4_update_other_inodes_time fs/ext4/inode.c:4868 [inline] ext4_do_update_inode fs/ext4/inode.c:4994 [inline] ext4_mark_iloc_dirty+0x12a8/0x1580 fs/ext4/inode.c:5547 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:5740 ext4_alloc_file_blocks+0x337/0x6e0 fs/ext4/extents.c:4694 ext4_fallocate+0x57a/0x1460 fs/ext4/extents.c:4955 vfs_fallocate+0x3be/0x650 fs/open.c:309 ksys_fallocate+0x61/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x5e/0x80 fs/open.c:338 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888128f93780 of 8 bytes by task 10963 on cpu 0: __mark_inode_dirty+0xb8/0x940 fs/fs-writeback.c:2272 mark_buffer_dirty+0x29c/0x2c0 fs/buffer.c:1156 __block_commit_write.isra.0+0x11f/0x170 fs/buffer.c:2081 block_write_end+0x6d/0x140 fs/buffer.c:2159 generic_write_end+0x8a/0x1f0 fs/buffer.c:2173 ext4_da_write_end+0x158/0x620 fs/ext4/inode.c:3091 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 __kernel_write+0xb8/0x240 fs/read_write.c:515 do_acct_process+0x9d9/0xba0 kernel/acct.c:520 slow_acct_process kernel/acct.c:579 [inline] acct_process+0x1d7/0x1ee kernel/acct.c:605 do_exit+0x1136/0x18c0 kernel/exit.c:787 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 get_signal+0x2a2/0x1320 kernel/signal.c:2734 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10963 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================