panic: munmap(600000, 200000)) failed: function not implemented

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-1"]: exit status 128
I0313 06:02:17.545302   13678 x:0] ***************************
I0313 06:02:17.545375   13678 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-1]
I0313 06:02:17.545394   13678 x:0] Git Revision: 8003bd6a5c012784c0b2a2dad93cbec969fac3b0
I0313 06:02:17.545400   13678 x:0] PID: 13678
I0313 06:02:17.545419   13678 x:0] UID: 0, GID: 0
I0313 06:02:17.545427   13678 x:0] Configuration:
I0313 06:02:17.545431   13678 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0313 06:02:17.545435   13678 x:0] 		Platform: ptrace
I0313 06:02:17.545458   13678 x:0] 		FileAccess: shared, overlay: false
I0313 06:02:17.545465   13678 x:0] 		Network: none, logging: false
I0313 06:02:17.545504   13678 x:0] 		Strace: false, max size: 1024, syscalls: []
I0313 06:02:17.545510   13678 x:0] ***************************
D0313 06:02:17.545533   13678 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-1"
D0313 06:02:17.547373   13678 x:0] Signal container "ci-gvisor-main-1": signal 0
D0313 06:02:17.547402   13678 x:0] Signal sandbox "ci-gvisor-main-1"
D0313 06:02:17.547407   13678 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0313 06:02:17.547569   13678 x:0] urpc: successfully marshalled 96 bytes.
I0313 06:02:17.794746   13678 x:0] Found sandbox "ci-gvisor-main-1", PID: 62246
I0313 06:02:17.794767   13678 x:0] Retrieving sandbox stacks
D0313 06:02:17.794772   13678 x:0] Stacks sandbox "ci-gvisor-main-1"
D0313 06:02:17.794777   13678 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0313 06:02:17.794843   13678 x:0] urpc: successfully marshalled 36 bytes.
W0313 06:02:17.840344   13678 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
goroutine 265028 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc0008426c0, 0x600000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:608 +0x372
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc0007e4d80, 0x600000, 0x800000)
	pkg/sentry/mm/address_space.go:215 +0x7a
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc0007e4d80, 0xc0007e5470, 0x1, 0x6f8000, 0x6f9000, 0x6f8000, 0x6f9000, 0xc0007e5470, 0x1, 0xc0007e5470)
	pkg/sentry/mm/pma.go:457 +0x906
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc0007e4d80, 0xdca8a0, 0xc000ee4000, 0xc0007e4df0, 0x1, 0x6f8000, 0x6f9000, 0x1, 0xc0007e4df0, 0x2, ...)
	pkg/sentry/mm/pma.go:146 +0x2e0
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc0007e4d80, 0xdca8a0, 0xc000ee4000, 0x6f8110, 0x101, 0x7f8f84092a60, 0xc00057aa00, 0x100)
	pkg/sentry/mm/syscalls.go:57 +0x195
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000ee4000, 0xdb2880, 0x0)
	pkg/sentry/kernel/task_run.go:251 +0x7ba
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000ee4000, 0x132d)
	pkg/sentry/kernel/task_run.go:91 +0x194
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe