panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 2465 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc0002b5070, 0xc000bcf8d8) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x314 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc0003383f0, 0xc0002b5050, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x4eb gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc0003383f0, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x37b gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc000fbf850) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x4d gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000bbb200, {0x21b8c30, 0xc000c27908}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0x116 gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc000bbb200, {0x21b8c30, 0xc000c27908}) pkg/sentry/vfs/dentry.go:156 +0x68 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc000e42d10?, 0xc000bbb200?}, {0x21b8c30, 0xc000c27908}) pkg/sentry/vfs/vfs.go:1114 +0x5b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc000e5b400, {0x21b8c30, 0xc000c27908}) 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(0xc000e5b400, 0xc000bcfd10) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_refs.go:133 +0xb4 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef(0xc000e5b400, {0x21b8c30, 0xc000c27908}) pkg/sentry/kernel/fs_context.go:86 +0xa5 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc000c27908?, 0xc000c27908) pkg/sentry/kernel/task_exit.go:301 +0x7d3 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000c27908, 0x2b8) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 2502 pkg/sentry/kernel/task_start.go:416 +0x17e known lock chain: kernfs.filesystemRWMutex -> kernel.taskMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskMutex ===== goroutine 12 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskMutex).Lock(0xc0005c09a0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/task_mutex.go:35 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).GetNetworkNamespace(0xc0005c0008) pkg/sentry/kernel/task_net.go:48 +0x4d gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc0005c0008) pkg/sentry/fsimpl/proc/task_net.go:47 +0x132 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc0005c0008, 0xc0002575e0, 0x1, 0x0) pkg/sentry/fsimpl/proc/task.go:77 +0x12d3 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc000888008, {0x21b8c30, 0xc0005c0008}, {0x1fa0bf5, 0x1}) pkg/sentry/fsimpl/proc/tasks.go:147 +0x3c6 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc0003165e0, 0xc000862a20, {0x1fa0bf5, 0x1}) pkg/sentry/fsimpl/kernfs/filesystem.go:127 +0x3eb gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc000b1a008, 0xc000862a20) pkg/sentry/fsimpl/kernfs/filesystem.go:74 +0x459 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc000b1a008) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0x106 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0005b6540, {0x21b8c30, 0xc0005c0008}, 0xc000b1a008) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0x14a gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0003165e0, {0x21b8c30, 0xc0005c0008}, 0xc0001963c0, 0xc000049598) pkg/sentry/vfs/vfs.go:512 +0x109 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc0005c0008, 0xffffff9c, 0xc0000b0070, 0xc0000c2d00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x305 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc0005c0008, 0x457b27?, {{0xffffffffffffff9c}, {0xc0000b0070}, {0xc0000c2d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0xc6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0005c0008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b0070}, {0xc0000c2d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0xb90 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0005c0008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b0070}, {0xc0000c2d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x85 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0005c0008, 0x10b, {{0xffffffffffffff9c}, {0xc0000b0070}, {0xc0000c2d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0xc7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0005c0008) pkg/sentry/kernel/task_syscall.go:258 +0x53e gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0005c0008?, 0xc0005c0008) pkg/sentry/kernel/task_run.go:269 +0x220c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0005c0008, 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.taskMutex -> kernel.fsContextMutex ===== goroutine 125 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc000684508) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).Fork(0xc000684500) pkg/sentry/kernel/fs_context.go:95 +0x65 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc000811908, 0x20000) pkg/sentry/kernel/task_clone.go:706 +0x1207 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0xc000811908, 0x457b27?, {{0x20000}, {0x7}, {0x7f0d34db9af0}, {0x0}, {0x0}, {0x55e0c8dd96c0}}) pkg/sentry/syscalls/linux/sys_thread.go:453 +0xd5 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000811908, 0x110, {{0x20000}, {0x7}, {0x7f0d34db9af0}, {0x0}, {0x0}, {0x55e0c8dd96c0}}) pkg/sentry/kernel/task_syscall.go:143 +0xb90 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000811908, 0x110, {{0x20000}, {0x7}, {0x7f0d34db9af0}, {0x0}, {0x0}, {0x55e0c8dd96c0}}) pkg/sentry/kernel/task_syscall.go:323 +0x85 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000811908, 0x110, {{0x20000}, {0x7}, {0x7f0d34db9af0}, {0x0}, {0x0}, {0x55e0c8dd96c0}}) pkg/sentry/kernel/task_syscall.go:283 +0xc7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000811908) pkg/sentry/kernel/task_syscall.go:258 +0x53e gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000811908?, 0xc000811908) pkg/sentry/kernel/task_run.go:269 +0x220c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000811908, 0xc) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 144 pkg/sentry/kernel/task_start.go:416 +0x17e