panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 368 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc00027f610, 0xc000e9b8d8) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x314 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc0002b4c60, 0xc00027f5f0, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x4eb gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc0002b4c60, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x37b gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc000d6e590) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x4d gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000e82e10, {0x21b8b30, 0xc000b57908}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0x116 gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc000e82e10, {0x21b8b30, 0xc000b57908}) pkg/sentry/vfs/dentry.go:156 +0x68 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc0002216b0?, 0xc000e82e10?}, {0x21b8b30, 0xc000b57908}) pkg/sentry/vfs/vfs.go:1114 +0x5b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc0008a5540, {0x21b8b30, 0xc000b57908}) pkg/sentry/kernel/fs_context.go:73 +0x16d gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef.func1() pkg/sentry/kernel/fs_context.go:87 +0x59 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContextRefs).DecRef(0xc0008a5540, 0xc000e9bd10) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_refs.go:133 +0xb4 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef(0xc0008a5540, {0x21b8b30, 0xc000b57908}) pkg/sentry/kernel/fs_context.go:86 +0xa5 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc000b57908?, 0xc000b57908) pkg/sentry/kernel/task_exit.go:301 +0x7d3 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000b57908, 0x4b) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 407 pkg/sentry/kernel/task_start.go:416 +0x17e known lock chain: kernfs.filesystemRWMutex -> kernel.taskSetRWMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskSetRWMutex ===== goroutine 152 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskSetRWMutex).RLock(0xc0005da0a0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/taskset_mutex.go:59 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*PIDNamespace).IDOfThreadGroup(0xc000481030, 0xc000301808) pkg/sentry/kernel/threads.go:328 +0x54 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Readlink(0xc000273340, {0x21b8b30, 0xc000660008}, 0x48866c?) pkg/sentry/fsimpl/proc/tasks_files.go:62 +0xb8 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Getlink(0xc000273340, {0x21b8b30, 0xc000660008}, 0xc000221ad0) pkg/sentry/fsimpl/proc/tasks_files.go:70 +0x5e gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc00044a540, {0x21b8b30, 0xc000660008}, 0xc00024a488, 0xc000870a20) pkg/sentry/fsimpl/kernfs/filesystem.go:83 +0x5e7 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc00044a540, {0x21b8b30, 0xc000660008}, 0xc00024a488) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0x106 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc00044a540, {0x21b8b30, 0xc000660008}, 0xc00024a488) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0x14a gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0000049e0, {0x21b8b30, 0xc000660008}, 0xc0004480c0, 0xc000c93598) pkg/sentry/vfs/vfs.go:512 +0x109 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc000660008, 0xffffff9c, 0xc00012a070, 0xc00013cd00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x305 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc000660008, 0x457b27?, {{0xffffffffffffff9c}, {0xc00012a070}, {0xc00013cd00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0xc6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000660008, 0x10b, {{0xffffffffffffff9c}, {0xc00012a070}, {0xc00013cd00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0xb90 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000660008, 0x10b, {{0xffffffffffffff9c}, {0xc00012a070}, {0xc00013cd00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x85 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000660008, 0x10b, {{0xffffffffffffff9c}, {0xc00012a070}, {0xc00013cd00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0xc7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000660008) pkg/sentry/kernel/task_syscall.go:258 +0x53e gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000660008?, 0xc000660008) pkg/sentry/kernel/task_run.go:269 +0x220c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000660008, 0x1) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1 pkg/sentry/kernel/task_start.go:416 +0x17e ====== kernel.taskSetRWMutex -> kernel.fsContextMutex ===== goroutine 43 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc000708048) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG(0xc000708040, 0xc000303008) pkg/sentry/kernel/fs_context.go:207 +0x145 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute(0xc0001919e0, 0xc0009acc88) pkg/sentry/kernel/task_exec.go:156 +0x3e8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0009acc88, 0x14) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 180 pkg/sentry/kernel/task_start.go:416 +0x17e