panic: ptrace status unexpected: got 31, wanted stopped

goroutine 3973637 [running]:
DIAGNOSIS:


Error collecting stacks: failed to run ["/syzkaller/managers/main/current/image" "-root" "/syzkaller/managers/main/workdir/gvisor_root" "-watchdog-action=panic" "-network=none" "-debug" "-platform=ptrace" "-file-access=shared" "-network=none" "debug" "-stacks" "ci-gvisor-main-2"]: exit status 128
I0312 05:38:52.535803   29826 x:0] ***************************
I0312 05:38:52.535862   29826 x:0] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=none debug -stacks ci-gvisor-main-2]
I0312 05:38:52.535896   29826 x:0] Git Revision: bc9b979b9412ad5852872c1a9bee462f73d2455e
I0312 05:38:52.535906   29826 x:0] PID: 29826
I0312 05:38:52.535912   29826 x:0] UID: 0, GID: 0
I0312 05:38:52.535916   29826 x:0] Configuration:
I0312 05:38:52.535955   29826 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0312 05:38:52.535963   29826 x:0] 		Platform: ptrace
I0312 05:38:52.535982   29826 x:0] 		FileAccess: shared, overlay: false
I0312 05:38:52.536008   29826 x:0] 		Network: none, logging: false
I0312 05:38:52.536016   29826 x:0] 		Strace: false, max size: 1024, syscalls: []
I0312 05:38:52.536031   29826 x:0] ***************************
D0312 05:38:52.536058   29826 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-2"
D0312 05:38:52.539112   29826 x:0] Signal container "ci-gvisor-main-2": signal 0
D0312 05:38:52.539135   29826 x:0] Signal sandbox "ci-gvisor-main-2"
D0312 05:38:52.539141   29826 x:0] Connecting to sandbox "ci-gvisor-main-2"
D0312 05:38:52.539527   29826 x:0] urpc: successfully marshalled 96 bytes.
I0312 05:38:53.094973   29826 x:0] Found sandbox "ci-gvisor-main-2", PID: 53907
I0312 05:38:53.094987   29826 x:0] Retrieving sandbox stacks
D0312 05:38:53.094991   29826 x:0] Stacks sandbox "ci-gvisor-main-2"
D0312 05:38:53.094995   29826 x:0] Connecting to sandbox "ci-gvisor-main-2"
D0312 05:38:53.095055   29826 x:0] urpc: successfully marshalled 36 bytes.
W0312 05:38:53.170887   29826 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc002f9ef00, 0x0, 0x3c68)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x37c
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc002f9ef00, 0xc0035bccc8, 0xc0035bce68, 0x2, 0x2)
	pkg/sentry/platform/ptrace/subprocess.go:390 +0xb8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc002f9ef00, 0xc002f9ef10, 0xb, 0xc0035bce68, 0x2, 0x2, 0x4, 0xc000dee610, 0xc000dee610)
	pkg/sentry/platform/ptrace/subprocess.go:428 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc000353040, 0xb, 0xc000dee668, 0x2, 0x2, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc000353040, 0x0, 0x7fffffff0000)
	pkg/sentry/platform/ptrace/subprocess.go:602 +0x234
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).unmap(0xc000353040)
	pkg/sentry/platform/ptrace/subprocess.go:215 +0x40
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Release.func1(0xc000353040)
	pkg/sentry/platform/ptrace/subprocess.go:232 +0x2f
created by gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Release
	pkg/sentry/platform/ptrace/subprocess.go:231 +0x3f