================================================================== BUG: KCSAN: data-race in __ext4_new_inode / find_next_zero_bit write to 0xffff8881225c6038 of 8 bytes by task 9011 on cpu 0: __test_and_set_bit include/asm-generic/bitops-instrumented.h:168 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:90 [inline] __ext4_new_inode+0xf54/0x3070 fs/ext4/ialloc.c:944 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262 vfs_symlink fs/namei.c:4127 [inline] vfs_symlink+0x218/0x310 fs/namei.c:4113 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4154 __do_sys_symlink fs/namei.c:4173 [inline] __se_sys_symlink fs/namei.c:4171 [inline] __x64_sys_symlink+0x3f/0x50 fs/namei.c:4171 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881225c6038 of 8 bytes by task 9010 on cpu 1: _find_next_bit lib/find_bit.c:39 [inline] find_next_zero_bit+0x4e/0xe0 lib/find_bit.c:79 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline] find_inode_bit.isra.0+0x82/0x300 fs/ext4/ialloc.c:715 __ext4_new_inode+0xd4b/0x3070 fs/ext4/ialloc.c:914 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262 vfs_symlink fs/namei.c:4127 [inline] vfs_symlink+0x218/0x310 fs/namei.c:4113 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4154 __do_sys_symlink fs/namei.c:4173 [inline] __se_sys_symlink fs/namei.c:4171 [inline] __x64_sys_symlink+0x3f/0x50 fs/namei.c:4171 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9010 Comm: syz-executor.2 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================