panic: WARNING: circular locking detected: kernel.fsContextMutex -> kernfs.filesystemRWMutex: goroutine 75682 [running]: gvisor.dev/gvisor/pkg/sync/locking.(*ancestorsAtomicPtrMap).RangeRepeatable(0xc0004cfa00, 0xc0025bb138) bazel-out/k8-fastbuild/bin/pkg/sync/locking/atomicptrmap_ancestors_unsafe.go:440 +0x314 gvisor.dev/gvisor/pkg/sync/locking.checkLock(0xc00038ecf0, 0xc0004cf9e0, {0x0, 0x0, 0x0}) pkg/sync/locking/lockdep.go:112 +0x4eb gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc00038ecf0, 0xffffffffffffffff) pkg/sync/locking/lockdep.go:144 +0x37b gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0023964d0) bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x4d gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc002738630, {0x21bc6b0, 0xc001f85908}) pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0x116 gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc002738630, {0x21bc6b0, 0xc001f85908}) pkg/sentry/vfs/dentry.go:156 +0x68 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc0023be370?, 0xc002738630?}, {0x21bc6b0, 0xc001f85908}) pkg/sentry/vfs/vfs.go:1114 +0x5b gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).SetWorkingDirectory(0xc0013bbb80, {0x21bc6b0, 0xc001f85908}, {0xc0023be370, 0xc001dca870}) pkg/sentry/kernel/fs_context.go:144 +0x23b gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Fchdir(0xc001f85908, 0x457b27?, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:361 +0x3b8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc001f85908, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0xb90 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc001f85908, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x85 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001f85908, 0x51, {{0x3}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0xc7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc001f85908) pkg/sentry/kernel/task_syscall.go:258 +0x53e gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc001f85908?, 0xc001f85908) pkg/sentry/kernel/task_run.go:269 +0x220c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001f85908, 0x570e) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 75666 pkg/sentry/kernel/task_start.go:416 +0x17e known lock chain: kernfs.filesystemRWMutex -> kernel.taskSetRWMutex -> kernel.fsContextMutex ====== kernfs.filesystemRWMutex -> kernel.taskSetRWMutex ===== goroutine 138 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*taskSetRWMutex).RLock(0xc0006480a0) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/taskset_mutex.go:59 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*PIDNamespace).IDOfThreadGroup(0xc00045f5e0, 0xc000459808) pkg/sentry/kernel/threads.go:328 +0x54 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Readlink(0xc00081c150, {0x21bc6b0, 0xc000810008}, 0x48866c?) pkg/sentry/fsimpl/proc/tasks_files.go:62 +0xb8 gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*selfSymlink).Getlink(0xc00081c150, {0x21bc6b0, 0xc000810008}, 0xc0009a4000) pkg/sentry/fsimpl/proc/tasks_files.go:70 +0x5e gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0000223c0, {0x21bc6b0, 0xc000810008}, 0xc0009c8008, 0xc0008f8ab0) pkg/sentry/fsimpl/kernfs/filesystem.go:83 +0x5e7 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0000223c0, {0x21bc6b0, 0xc000810008}, 0xc0009c8008) pkg/sentry/fsimpl/kernfs/filesystem.go:197 +0x106 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).ReadlinkAt(0xc0000223c0, {0x21bc6b0, 0xc000810008}, 0xc0009c8008) pkg/sentry/fsimpl/kernfs/filesystem.go:697 +0x14a gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).ReadlinkAt(0xc0000045e0, {0x21bc6b0, 0xc000810008}, 0xc000196480, 0xc000049598) pkg/sentry/vfs/vfs.go:512 +0x109 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readlinkat(0xc000810008, 0xffffff9c, 0xc000120070, 0xc000132d00, 0x80) pkg/sentry/syscalls/linux/sys_file.go:1096 +0x305 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readlinkat(0xc000810008, 0x457b27?, {{0xffffffffffffff9c}, {0xc000120070}, {0xc000132d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/syscalls/linux/sys_file.go:1067 +0xc6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000810008, 0x10b, {{0xffffffffffffff9c}, {0xc000120070}, {0xc000132d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:143 +0xb90 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000810008, 0x10b, {{0xffffffffffffff9c}, {0xc000120070}, {0xc000132d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:323 +0x85 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000810008, 0x10b, {{0xffffffffffffff9c}, {0xc000120070}, {0xc000132d00}, {0x80}, {0x0}, {0x0}}) pkg/sentry/kernel/task_syscall.go:283 +0xc7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000810008) pkg/sentry/kernel/task_syscall.go:258 +0x53e gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000810008?, 0xc000810008) pkg/sentry/kernel/task_run.go:269 +0x220c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000810008, 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.taskSetRWMutex -> kernel.fsContextMutex ===== goroutine 183 [running]: gvisor.dev/gvisor/pkg/sentry/kernel.(*fsContextMutex).Lock(0xc0008e2888) bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fs_context_mutex.go:33 +0x4d gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG(0xc0008e2880, 0xc00045b008) pkg/sentry/kernel/fs_context.go:209 +0x145 gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute(0xc000197aa0, 0xc000bfd908) pkg/sentry/kernel/task_exec.go:156 +0x3e8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000bfd908, 0xc) pkg/sentry/kernel/task_run.go:97 +0x402 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 181 pkg/sentry/kernel/task_start.go:416 +0x17e