================================================================== BUG: KCSAN: data-race in vfs_readlink / vfs_unlink write to 0xffff888115923cc0 of 4 bytes by task 21032 on cpu 1: dont_mount include/linux/dcache.h:354 [inline] vfs_unlink+0x26e/0x3d0 fs/namei.c:3827 do_unlinkat+0x28a/0x4d0 fs/namei.c:3889 __do_sys_unlink fs/namei.c:3936 [inline] __se_sys_unlink fs/namei.c:3934 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888115923cc0 of 4 bytes by task 5029 on cpu 0: __d_entry_type include/linux/dcache.h:391 [inline] d_is_symlink include/linux/dcache.h:421 [inline] vfs_readlink+0x1c1/0x260 fs/namei.c:4535 do_readlinkat+0x170/0x200 fs/stat.c:431 __do_sys_readlink fs/stat.c:452 [inline] __se_sys_readlink fs/stat.c:449 [inline] __x64_sys_readlink+0x43/0x50 fs/stat.c:449 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5029 Comm: systemd-udevd Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 5029 Comm: systemd-udevd Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x10f/0x19d lib/dump_stack.c:118 panic+0x1f8/0x63a kernel/panic.c:231 kcsan_report+0x684/0x690 kernel/kcsan/report.c:626 kcsan_setup_watchpoint+0x453/0x4d0 kernel/kcsan/core.c:519 __d_entry_type include/linux/dcache.h:391 [inline] d_is_symlink include/linux/dcache.h:421 [inline] vfs_readlink+0x1c1/0x260 fs/namei.c:4535 do_readlinkat+0x170/0x200 fs/stat.c:431 __do_sys_readlink fs/stat.c:452 [inline] __se_sys_readlink fs/stat.c:449 [inline] __x64_sys_readlink+0x43/0x50 fs/stat.c:449 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f10ab04f087 Code: Bad RIP value. RSP: 002b:00007ffe71efff38 EFLAGS: 00000293 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffe71efffd0 RCX: 00007f10ab04f087 RDX: 0000000000000200 RSI: 00007ffe71f000e0 RDI: 00007ffe71efffb0 RBP: 00007ffe71f00538 R08: 0000000000000001 R09: 0000000000000014 R10: 0000000000000064 R11: 0000000000000293 R12: 00007ffe71f000e0 R13: 000055bae6fb7010 R14: 000055bae6fb70e0 R15: 00007ffe71efffb0 Kernel Offset: disabled Rebooting in 86400 seconds..