================================================================== BUG: KCSAN: data-race in vfs_readlink / vfs_unlink write to 0xffff888125792d80 of 4 bytes by task 9745 on cpu 1: dont_mount include/linux/dcache.h:352 [inline] vfs_unlink+0x26a/0x3e0 fs/namei.c:4005 do_unlinkat+0x32b/0x530 fs/namei.c:4067 __do_sys_unlink fs/namei.c:4114 [inline] __se_sys_unlink fs/namei.c:4112 [inline] __x64_sys_unlink+0x3b/0x50 fs/namei.c:4112 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888125792d80 of 4 bytes by task 3988 on cpu 0: d_is_symlink include/linux/dcache.h:419 [inline] vfs_readlink+0x1bf/0x270 fs/namei.c:4730 do_readlinkat+0x1f1/0x220 fs/stat.c:411 __do_sys_readlink fs/stat.c:432 [inline] __se_sys_readlink fs/stat.c:429 [inline] __x64_sys_readlink+0x51/0x70 fs/stat.c:429 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3988 Comm: udevd Not tainted 5.5.0-rc1-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: 3988 Comm: udevd Not tainted 5.5.0-rc1-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+0x11d/0x181 lib/dump_stack.c:118 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:313 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:416 check_access kernel/kcsan/core.c:459 [inline] __tsan_read4+0xc6/0x100 kernel/kcsan/core.c:588 d_is_symlink include/linux/dcache.h:419 [inline] vfs_readlink+0x1bf/0x270 fs/namei.c:4730 do_readlinkat+0x1f1/0x220 fs/stat.c:411 __do_sys_readlink fs/stat.c:432 [inline] __se_sys_readlink fs/stat.c:429 [inline] __x64_sys_readlink+0x51/0x70 fs/stat.c:429 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f7d0cc6b577 Code: f0 ff ff 77 02 f3 c3 48 8b 15 bd 38 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 90 90 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 38 2b 00 31 d2 48 29 c2 64 RSP: 002b:00007fff4a77ea28 EFLAGS: 00000206 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 0000000001c7e250 RCX: 00007f7d0cc6b577 RDX: 00000000000003fc RSI: 00007fff4a77ee54 RDI: 00007fff4a77ea50 RBP: 00000000000003fc R08: 0000000001c7e0d0 R09: 00007f7d0ccc01d0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000001c8f960 R15: 0000000001c7e250 Kernel Offset: disabled Rebooting in 86400 seconds..