panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 658 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc0003cce30, 0xc0000478e0) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x1e8 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc000292cf0, 0xc0003cce10, {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(0xc0002b5010) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x3c gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000b26fc0, {0x2112f90, 0xc001324588}) 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({0xc00022b600?, 0xc000b26fc0?}, {0x2112f90, 0xc001324588}) pkg/sentry/vfs/vfs.go:1114 +0x6b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc00058c200, {0x2112f90, 0xc001324588}) 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(0xc00058c200, 0xc000047da0) 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(0xc001324588?, 0xc001324588) pkg/sentry/kernel/task_exit.go:301 +0x82b gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001324588, 0x44) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 612 pkg/sentry/kernel/task_start.go:416 +0x15c known lock chain: kernfs.filesystemRWMutex -> kernel.taskSetRWMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskSetRWMutex ===== goroutine 234 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskSetRWMutex).RLock(0xc000014000) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/taskset_mutex.go:59 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*PIDNamespace).IDOfThreadGroup(0xc000300a80, 0xc0002e7808) pkg/sentry/kernel/threads.go:328 +0x45 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Readlink(0xc0002ef030, {0x2112f90, 0xc0006e6008}, 0x489e69?) pkg/sentry/fsimpl/proc/tasks_files.go:62 +0xb8 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Getlink(0xc0002ef030, {0x2112f90, 0xc0006e6008}, 0xc0002f8f20) pkg/sentry/fsimpl/proc/tasks_files.go:70 +0x45 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0002b46c0, {0x2112f90, 0xc0006e6008}, 0xc000256d88, 0xc000334510) pkg/sentry/fsimpl/kernfs/filesystem.go:83 +0x4cf gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0002b46c0, {0x2112f90, 0xc0006e6008}, 0xc000256d88) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0xc5 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0002b46c0, {0x2112f90, 0xc0006e6008}, 0xc000256d88) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0x136 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0000049e0, {0x2112f90, 0xc0006e6008}, 0xc000168420, 0xc000047588) pkg/sentry/vfs/vfs.go:512 +0xed gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc0006e6008, 0xffffff9c, 0xc0000b8070, 0xc0000cad00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x26c gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc0006e6008, 0xc000884090?, {{0xffffffffffffff9c}, {0xc0000b8070}, {0xc0000cad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0x46 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0006e6008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b8070}, {0xc0000cad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x94c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0006e6008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b8070}, {0xc0000cad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x72 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0006e6008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b8070}, {0xc0000cad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0x94 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0006e6008) pkg/sentry/kernel/task_syscall.go:258 +0x490 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0006e6008?, 0xc0006e6008) pkg/sentry/kernel/task_run.go:269 +0x1ec9 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0006e6008, 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 267 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc0002df348) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG(0xc0002df340, 0xc0002e9008) pkg/sentry/kernel/fs_context.go:207 +0x130 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute(0xc0002c24e0, 0xc0002fd208) pkg/sentry/kernel/task_exec.go:156 +0x388 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0002fd208, 0x15) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 241 pkg/sentry/kernel/task_start.go:416 +0x15c