panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 531 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc00034cec0, 0xc000f678a8) bazel-out/aarch64-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x190 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc000212cf0, 0xc00034cea0, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x34c gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc000212cf0, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x268 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0010e0b90) bazel-out/aarch64-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x40 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc0012cdc20, {0x1ca29d8, 0xc000715208}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0x94 gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(...) pkg/sentry/vfs/dentry.go:156 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc0007d4790?, 0xc0012cdc20?}, {0x1ca29d8, 0xc000715208}) pkg/sentry/vfs/vfs.go:1114 +0x6c gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc000758a00, {0x1ca29d8, 0xc000715208}) pkg/sentry/kernel/fs_context.go:73 +0x110 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute.(*FSContext).DecRef.func2() pkg/sentry/kernel/fs_context.go:87 +0x48 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContextRefs).DecRef(0xc000758a00, 0xc000f67d88) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/fs_context_refs.go:133 +0x58 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef(...) pkg/sentry/kernel/fs_context.go:86 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc000715208?, 0xc000715208) pkg/sentry/kernel/task_exit.go:301 +0x5d8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000715208, 0x40) pkg/sentry/kernel/task_run.go:97 +0x394 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 486 pkg/sentry/kernel/task_start.go:416 +0x13c known lock chain: kernfs.filesystemRWMutex -> kernel.taskMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskMutex ===== goroutine 137 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskMutex).Lock(0xc0001589a0) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/task_mutex.go:35 +0x40 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).GetNetworkNamespace(0xc000158008) pkg/sentry/kernel/task_net.go:48 +0x38 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc000158008) pkg/sentry/fsimpl/proc/task_net.go:47 +0x220 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc000158008, 0xc0002d6700, 0x1, 0x0) pkg/sentry/fsimpl/proc/task.go:77 +0xfe8 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc000227808, {0x1ca29d8, 0xc000158008}, {0x1a67877, 0x1}) pkg/sentry/fsimpl/proc/tasks.go:147 +0x354 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc0001f2600, 0xc00018fa70, {0x1a67877, 0x1}) pkg/sentry/fsimpl/kernfs/filesystem.go:127 +0x248 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc0004d1208, 0xc00018fa70) pkg/sentry/fsimpl/kernfs/filesystem.go:74 +0x278 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc0004d1208) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0xb0 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0001d0300, {0x1ca29d8, 0xc000158008}, 0xc0004d1208) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0xc4 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0001f2600, {0x1ca29d8, 0xc000158008}, 0xc0002400c0, 0xc000591560) pkg/sentry/vfs/vfs.go:512 +0xc4 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc000158008, 0xffffff9c, 0x4000118070, 0x400012ad00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x17c gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc000158008, 0x47cb80?, {{0xffffffffffffff9c}, {0x4000118070}, {0x400012ad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000158008, 0x4e, {{0xffffffffffffff9c}, {0x4000118070}, {0x400012ad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x690 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000158008, 0x4e, {{0xffffffffffffff9c}, {0x4000118070}, {0x400012ad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x50 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000158008, 0x4e, {{0xffffffffffffff9c}, {0x4000118070}, {0x400012ad00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0x78 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000158008) pkg/sentry/kernel/task_syscall.go:258 +0x3c0 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000158008?, 0xc000158008) pkg/sentry/kernel/task_run.go:269 +0x1568 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000158008, 0x1) pkg/sentry/kernel/task_run.go:97 +0x394 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1 pkg/sentry/kernel/task_start.go:416 +0x13c ====== kernel.taskMutex -> kernel.fsContextMutex ===== goroutine 177 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc000916048) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x40 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).Fork(0xc000916040) pkg/sentry/kernel/fs_context.go:95 +0x40 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc000833908, 0x20000) pkg/sentry/kernel/task_clone.go:706 +0xd88 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0xc000833908, 0x47cb80?, {{0x20000}, {0x7}, {0xef9367256ae0}, {0x0}, {0x0}, {0xef4051c9f798}}) pkg/sentry/syscalls/linux/sys_thread.go:453 +0x58 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000833908, 0x61, {{0x20000}, {0x7}, {0xef9367256ae0}, {0x0}, {0x0}, {0xef4051c9f798}}) pkg/sentry/kernel/task_syscall.go:143 +0x690 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000833908, 0x61, {{0x20000}, {0x7}, {0xef9367256ae0}, {0x0}, {0x0}, {0xef4051c9f798}}) pkg/sentry/kernel/task_syscall.go:323 +0x50 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000833908, 0x61, {{0x20000}, {0x7}, {0xef9367256ae0}, {0x0}, {0x0}, {0xef4051c9f798}}) pkg/sentry/kernel/task_syscall.go:283 +0x78 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000833908) pkg/sentry/kernel/task_syscall.go:258 +0x3c0 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000833908?, 0xc000833908) pkg/sentry/kernel/task_run.go:269 +0x1568 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000833908, 0x15) pkg/sentry/kernel/task_run.go:97 +0x394 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 182 pkg/sentry/kernel/task_start.go:416 +0x13c