================================================================== BUG: KCSAN: data-race in __ext4_new_inode / _find_next_bit.constprop.0 write to 0xffff8881243283c0 of 8 bytes by task 11446 on cpu 0: instrument_write include/linux/instrumented.h:42 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:71 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:90 [inline] __ext4_new_inode+0xf4d/0x3020 fs/ext4/ialloc.c:957 ext4_symlink+0x322/0x9e0 fs/ext4/namei.c:3295 vfs_symlink fs/namei.c:3937 [inline] vfs_symlink+0x216/0x330 fs/namei.c:3923 do_symlinkat+0x1ac/0x1e0 fs/namei.c:3964 __do_sys_symlink fs/namei.c:3983 [inline] __se_sys_symlink fs/namei.c:3981 [inline] __x64_sys_symlink+0x3c/0x50 fs/namei.c:3981 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881243283c0 of 8 bytes by task 11444 on cpu 1: _find_next_bit.constprop.0+0x61/0x160 lib/find_bit.c:39 find_next_zero_bit+0x35/0x50 lib/find_bit.c:87 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline] find_inode_bit.isra.0+0xa1/0x330 fs/ext4/ialloc.c:718 __ext4_new_inode+0xd7b/0x3020 fs/ext4/ialloc.c:927 ext4_symlink+0x322/0x9e0 fs/ext4/namei.c:3295 vfs_symlink fs/namei.c:3937 [inline] vfs_symlink+0x216/0x330 fs/namei.c:3923 do_symlinkat+0x1ac/0x1e0 fs/namei.c:3964 __do_sys_symlink fs/namei.c:3983 [inline] __se_sys_symlink fs/namei.c:3981 [inline] __x64_sys_symlink+0x3c/0x50 fs/namei.c:3981 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11444 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================