================================================================== BUG: KCSAN: data-race in __ext4_new_inode / _find_next_bit read-write to 0xffff888237c610a8 of 8 bytes by task 830 on cpu 0: instrument_read_write include/linux/instrumented.h:57 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:81 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:120 [inline] __ext4_new_inode+0xf60/0x2fd0 fs/ext4/ialloc.c:1097 ext4_symlink+0x2cc/0x700 fs/ext4/namei.c:3293 vfs_symlink+0x23f/0x350 fs/namei.c:4250 do_symlinkat+0x104/0x380 fs/namei.c:4279 __do_sys_symlink fs/namei.c:4301 [inline] __se_sys_symlink fs/namei.c:4299 [inline] __x64_sys_symlink+0x52/0x60 fs/namei.c:4299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888237c610a8 of 8 bytes by task 829 on cpu 1: _find_next_bit+0xe0/0x190 lib/find_bit.c:60 find_next_zero_bit include/asm-generic/bitops/find.h:94 [inline] find_next_zero_bit_le include/asm-generic/bitops/le.h:17 [inline] find_inode_bit+0xc8/0x330 fs/ext4/ialloc.c:725 __ext4_new_inode+0xc9a/0x2fd0 fs/ext4/ialloc.c:1066 ext4_symlink+0x2cc/0x700 fs/ext4/namei.c:3293 vfs_symlink+0x23f/0x350 fs/namei.c:4250 do_symlinkat+0x104/0x380 fs/namei.c:4279 __do_sys_symlink fs/namei.c:4301 [inline] __se_sys_symlink fs/namei.c:4299 [inline] __x64_sys_symlink+0x52/0x60 fs/namei.c:4299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000000 -> 0x0000000000000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 829 Comm: syz-executor.5 Tainted: G W 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================