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"])
panic: replaceArg: group fields don't match: 1/0

goroutine 13 [running]:
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5940?}, {0xe56770?, 0xc000535980?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:377 +0x425
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5960?}, {0xe56770?, 0xc000535900?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5980?}, {0xe56770?, 0xc000535880?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e59a0?}, {0xe56770?, 0xc000535860?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e59c0?}, {0xe56770?, 0xc000535840?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e59e0?}, {0xe56770?, 0xc000535820?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5a00?}, {0xe56770?, 0xc000535800?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5a20?}, {0xe56770?, 0xc000535380?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.replaceArg({0xe56770?, 0xc0004e5a40?}, {0xe56770?, 0xc000535360?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:382 +0x345
github.com/google/syzkaller/prog.(*StructType).mutate(0x16d4620, 0xc0004e4f80, 0xc0017749b0, {0xe56770, 0xc0004e5a60?}, {0xc001774738, {0x1db7580, 0x4, 0x4}, 0xc000f89050, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:490 +0x185
github.com/google/syzkaller/prog.(*Target).mutateArg(0x0?, 0x7fb180ee0108?, 0x30?, {0xe56770, 0xc0004e5a60}, {0xc001774738, {0x1db7580, 0x4, 0x4}, 0xc000f89050, ...}, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:245 +0xe2
github.com/google/syzkaller/prog.(*mutator).mutateArg(0xc000e03d60)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:196 +0x245
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc0019d46c0, {0xe52aa8?, 0xc00146ed20}, 0x1e, 0xc001350140, 0xc00007af00, {0xc001200000, 0x40f, 0x500})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:51 +0x2ba
main.(*Proc).smashInput(0xc00187b7c0, 0xc001a01ce0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:221 +0x165
main.(*Proc).loop(0xc00187b7c0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:78 +0xf2
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:336 +0x1665