panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 234582 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc0003fb190, 0xc003069160) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x1e8 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc000281050, 0xc0003fb170, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x48a gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc000281050, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x2ec gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0efc2eb90) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x3c gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc002bcc510, {0x2116790, 0xc004fe7208}) 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({0xc0e26d6b00?, 0xc002bcc510?}, {0x2116790, 0xc004fe7208}) pkg/sentry/vfs/vfs.go:1114 +0x6b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).SetWorkingDirectory(0xc0027ca800, {0x2116790, 0xc004fe7208}, {0xc0e26d6b00, 0xc00327dd40}) pkg/sentry/kernel/fs_context.go:144 +0x1f2 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Fchdir(0xc004fe7208, 0xc001c7ad90?, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:361 +0x325 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc004fe7208, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x94c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc004fe7208, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x72 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc004fe7208, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0x94 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc004fe7208) pkg/sentry/kernel/task_syscall.go:258 +0x490 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc004fe7208?, 0xc004fe7208) pkg/sentry/kernel/task_run.go:269 +0x1ec9 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc004fe7208, 0xc68) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 234523 pkg/sentry/kernel/task_start.go:416 +0x15c known lock chain: kernfs.filesystemRWMutex -> kernel.taskMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskMutex ===== goroutine 245 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskMutex).Lock(0xc0006729a0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/task_mutex.go:35 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).GetNetworkNamespace(0xc000672008) pkg/sentry/kernel/task_net.go:48 +0x3c gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc000672008) pkg/sentry/fsimpl/proc/task_net.go:47 +0x2d3 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc000672008, 0xc00023e2a0, 0x1, 0x0) pkg/sentry/fsimpl/proc/task.go:77 +0x15a5 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc00080d008, {0x2116790, 0xc000672008}, {0x1ed6372, 0x1}) pkg/sentry/fsimpl/proc/tasks.go:147 +0x4aa gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc0000049e0, 0xc000810000, {0x1ed6372, 0x1}) pkg/sentry/fsimpl/kernfs/filesystem.go:127 +0x358 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc0002d8d88, 0xc000810000) pkg/sentry/fsimpl/kernfs/filesystem.go:74 +0x33c gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc0002d8d88) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0xc5 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0002b06c0, {0x2116790, 0xc000672008}, 0xc0002d8d88) pkg/sentry/fsimpl/kernfs/filesystem.go:697 +0x136 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0000049e0, {0x2116790, 0xc000672008}, 0xc00041a1e0, 0xc00062d588) pkg/sentry/vfs/vfs.go:512 +0xed gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc000672008, 0xffffff9c, 0xc000102070, 0xc000114d00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x26c gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc000672008, 0xc000232570?, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0x46 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000672008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x94c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000672008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x72 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000672008, 0x10b, {{0xffffffffffffff9c}, {0xc000102070}, {0xc000114d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0x94 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000672008) pkg/sentry/kernel/task_syscall.go:258 +0x490 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000672008?, 0xc000672008) pkg/sentry/kernel/task_run.go:269 +0x1ec9 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000672008, 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.taskMutex -> kernel.fsContextMutex ===== goroutine 261 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc000408048) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x3c gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).Fork(0xc000408040) pkg/sentry/kernel/fs_context.go:97 +0x53 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc000331208, 0x20000) pkg/sentry/kernel/task_clone.go:706 +0x12d2 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0xc000331208, 0xc000216570?, {{0x20000}, {0x7}, {0x7f4cc2d5eaf0}, {0x0}, {0x0}, {0x55daa2d736c0}}) pkg/sentry/syscalls/linux/sys_thread.go:453 +0x4f gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000331208, 0x110, {{0x20000}, {0x7}, {0x7f4cc2d5eaf0}, {0x0}, {0x0}, {0x55daa2d736c0}}) pkg/sentry/kernel/task_syscall.go:143 +0x94c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000331208, 0x110, {{0x20000}, {0x7}, {0x7f4cc2d5eaf0}, {0x0}, {0x0}, {0x55daa2d736c0}}) pkg/sentry/kernel/task_syscall.go:323 +0x72 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000331208, 0x110, {{0x20000}, {0x7}, {0x7f4cc2d5eaf0}, {0x0}, {0x0}, {0x55daa2d736c0}}) pkg/sentry/kernel/task_syscall.go:283 +0x94 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000331208) pkg/sentry/kernel/task_syscall.go:258 +0x490 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000331208?, 0xc000331208) pkg/sentry/kernel/task_run.go:269 +0x1ec9 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000331208, 0x11) pkg/sentry/kernel/task_run.go:97 +0x4ca created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 259 pkg/sentry/kernel/task_start.go:416 +0x15c