panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 348 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc0003cee30, 0xc0005378e0) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x1e8 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc000292cf0, 0xc0003cee10, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x48a gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc000292cf0, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x2ec gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc00026e530) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x3c gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000c5aab0, {0x2112f90, 0xc00094ec88}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0xaf gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(...) pkg/sentry/vfs/dentry.go:156 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc000c5c000?, 0xc000c5aab0?}, {0x2112f90, 0xc00094ec88}) pkg/sentry/vfs/vfs.go:1114 +0x6b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc0007ac140, {0x2112f90, 0xc00094ec88}) pkg/sentry/kernel/fs_context.go:73 +0x153 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute.(*FSContext).DecRef.func2() pkg/sentry/kernel/fs_context.go:87 +0x47 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContextRefs).DecRef(0xc0007ac140, 0xc000537da0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_refs.go:133 +0x6d gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef(...) pkg/sentry/kernel/fs_context.go:86 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc00094ec88?, 0xc00094ec88) pkg/sentry/kernel/task_exit.go:301 +0x82b gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00094ec88, 0x42) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 389 pkg/sentry/kernel/task_start.go:416 +0x15c known lock chain: kernfs.filesystemRWMutex -> kernel.taskSetRWMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskSetRWMutex ===== goroutine 148 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskSetRWMutex).RLock(0xc0001d60a0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/taskset_mutex.go:59 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*PIDNamespace).IDOfThreadGroup(0xc000335a40, 0xc0002e7808) pkg/sentry/kernel/threads.go:328 +0x45 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Readlink(0xc0002ef420, {0x2112f90, 0xc0003bc008}, 0x489e69?) pkg/sentry/fsimpl/proc/tasks_files.go:62 +0xb8 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Getlink(0xc0002ef420, {0x2112f90, 0xc0003bc008}, 0xc0002551e0) pkg/sentry/fsimpl/proc/tasks_files.go:70 +0x45 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc000000540, {0x2112f90, 0xc0003bc008}, 0xc000302908, 0xc0003cfcb0) pkg/sentry/fsimpl/kernfs/filesystem.go:83 +0x4cf gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc000000540, {0x2112f90, 0xc0003bc008}, 0xc000302908) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0xc5 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc000000540, {0x2112f90, 0xc0003bc008}, 0xc000302908) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0x136 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc00031a5e0, {0x2112f90, 0xc0003bc008}, 0xc000196240, 0xc0002bf588) pkg/sentry/vfs/vfs.go:512 +0xed gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc0003bc008, 0xffffff9c, 0xc000102070, 0xc000114d00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x26c gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc0003bc008, 0xc0006108b0?, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0x46 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0003bc008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x94c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0003bc008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x72 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003bc008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0x94 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0003bc008) pkg/sentry/kernel/task_syscall.go:258 +0x490 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0003bc008?, 0xc0003bc008) pkg/sentry/kernel/task_run.go:269 +0x1ec9 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0003bc008, 0x1) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1 pkg/sentry/kernel/task_start.go:416 +0x15c ====== kernel.taskSetRWMutex -> kernel.fsContextMutex ===== goroutine 108 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc0001f1448) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG(0xc0001f1440, 0xc0002e9008) pkg/sentry/kernel/fs_context.go:207 +0x130 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute(0xc000420ae0, 0xc000244588) pkg/sentry/kernel/task_exec.go:156 +0x388 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000244588, 0x15) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 129 pkg/sentry/kernel/task_start.go:416 +0x15c