panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 643 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc000293c40, 0xc000fab8a0) bazel-out/aarch64-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x29c gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc000234c60, 0xc000293c20, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x3a0 gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc000234c60, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x2fc gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0016141d0) bazel-out/aarch64-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x50 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc0015ca6c0, {0x1d61bb8, 0xc001526588}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0xe8 gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc0015ca6c0, {0x1d61bb8, 0xc001526588}) pkg/sentry/vfs/dentry.go:156 +0x6c gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc0001b4d10?, 0xc0015ca6c0?}, {0x1d61bb8, 0xc001526588}) pkg/sentry/vfs/vfs.go:1114 +0x58 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).destroy(0xc000dfb2c0, {0x1d61bb8, 0xc001526588}) pkg/sentry/kernel/fs_context.go:73 +0x120 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef.func1() pkg/sentry/kernel/fs_context.go:87 +0x58 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContextRefs).DecRef(0xc000dfb2c0, 0xc000fabcf8) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/fs_context_refs.go:133 +0xa0 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).DecRef(0xc000dfb2c0, {0x1d61bb8, 0xc001526588}) pkg/sentry/kernel/fs_context.go:86 +0x90 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc001526588?, 0xc001526588) pkg/sentry/kernel/task_exit.go:301 +0x5cc gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001526588, 0x4a) pkg/sentry/kernel/task_run.go:97 +0x2f8 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 615 pkg/sentry/kernel/task_start.go:416 +0x160 known lock chain: kernfs.filesystemRWMutex -> kernel.taskMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskMutex ===== goroutine 30 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskMutex).Lock(0xc0007209a0) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/task_mutex.go:35 +0x50 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).GetNetworkNamespace(0xc000720008) pkg/sentry/kernel/task_net.go:48 +0x48 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc000720008) pkg/sentry/fsimpl/proc/task_net.go:47 +0xec gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc000720008, 0xc0001bb810, 0x1, 0x0) pkg/sentry/fsimpl/proc/task.go:77 +0xe40 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc000a53c08, {0x1d61bb8, 0xc000720008}, {0x1b4910e, 0x1}) pkg/sentry/fsimpl/proc/tasks.go:147 +0x2dc gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc0001f4600, 0xc0007ab560, {0x1b4910e, 0x1}) pkg/sentry/fsimpl/kernfs/filesystem.go:127 +0x2b8 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc000a5ad88, 0xc0007ab560) pkg/sentry/fsimpl/kernfs/filesystem.go:74 +0x380 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc000a5ad88) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0xe8 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0001ac540, {0x1d61bb8, 0xc000720008}, 0xc000a5ad88) pkg/sentry/fsimpl/kernfs/filesystem.go:696 +0xd4 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0001f4600, {0x1d61bb8, 0xc000720008}, 0xc0000fc420, 0xc0000475a0) pkg/sentry/vfs/vfs.go:512 +0xe0 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc000720008, 0xffffff9c, 0x400000e090, 0x400007ed80, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x1f0 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc000720008, 0x1?, {{0xffffffffffffff9c}, {0x400000e090}, {0x400007ed80}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0xac gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000720008, 0x4e, {{0xffffffffffffff9c}, {0x400000e090}, {0x400007ed80}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0x880 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000720008, 0x4e, {{0xffffffffffffff9c}, {0x400000e090}, {0x400007ed80}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x60 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000720008, 0x4e, {{0xffffffffffffff9c}, {0x400000e090}, {0x400007ed80}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0xa8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000720008) pkg/sentry/kernel/task_syscall.go:258 +0x45c gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000720008?, 0xc000720008) pkg/sentry/kernel/task_run.go:269 +0x1814 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000720008, 0x1) pkg/sentry/kernel/task_run.go:97 +0x2f8 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1 pkg/sentry/kernel/task_start.go:416 +0x160 ====== kernel.taskMutex -> kernel.fsContextMutex ===== goroutine 161 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc0008e4008) bazel-out/aarch64-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x50 gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).Fork(0xc0008e4000) pkg/sentry/kernel/fs_context.go:95 +0x50 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc000900008, 0x20000) pkg/sentry/kernel/task_clone.go:706 +0xcf8 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0xc000900008, 0x1?, {{0x20000}, {0x7}, {0xebd370457ae0}, {0x0}, {0x0}, {0xf12e0130b798}}) pkg/sentry/syscalls/linux/sys_thread.go:453 +0xcc gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000900008, 0x61, {{0x20000}, {0x7}, {0xebd370457ae0}, {0x0}, {0x0}, {0xf12e0130b798}}) pkg/sentry/kernel/task_syscall.go:143 +0x880 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000900008, 0x61, {{0x20000}, {0x7}, {0xebd370457ae0}, {0x0}, {0x0}, {0xf12e0130b798}}) pkg/sentry/kernel/task_syscall.go:323 +0x60 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000900008, 0x61, {{0x20000}, {0x7}, {0xebd370457ae0}, {0x0}, {0x0}, {0xf12e0130b798}}) pkg/sentry/kernel/task_syscall.go:283 +0xa8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000900008) pkg/sentry/kernel/task_syscall.go:258 +0x45c gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000900008?, 0xc000900008) pkg/sentry/kernel/task_run.go:269 +0x1814 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000900008, 0x17) pkg/sentry/kernel/task_run.go:97 +0x2f8 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 200 pkg/sentry/kernel/task_start.go:416 +0x160