panic: runtime error: invalid memory address or nil pointer dereference

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 4e7e04ca Add code to spin up secondary CPUs.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=146fb7df600000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=6f202bdd2db5e9295fdf

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6f202b...@syzkaller.appspotmail.com

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x0]

goroutine 24 [running]:
runtime: unexpected return pc for runtime.sigpanic called from 0x0
stack: frame={sp:0xc0006a57b0, fp:0xc0006a57e0}
stack=[0xc0006a2000,0xc0006a6000)
000000c0006a56b0: 0000000000000000 000000c0006a5710
000000c0006a56c0: 000000000042c3bf <runtime.preprintpanics+415>
000000000042cdd5 <runtime.fatalpanic+117>
000000c0006a56d0: 000000c0006a56e0 000000c002600ae0
000000c0006a56e0: 0000000000457950 <runtime.fatalpanic.func1+0>
000000c0006a5778
000000c0006a56f0: 000000c000105380 000000000042c7b5 <runtime.gopanic+709>
000000c0006a5700: 000000c0006a5720 000000c0006a56df
000000c0006a5710: 000000c0006a57a0 000000000042c7b5 <runtime.gopanic+709>
000000c0006a5720: 000000c0006a5778 00000000008f6920
000000c0006a5730: 000000c0030fac70 0000001000000010
000000c0006a5740: 00000000007d6b2e <main.(*Proc).executeRaw+158>
0000000000000000
000000c0006a5750: 000000c0006a5cf0 000000c000105380
000000c0006a5760: 0000000000000000 000000c0030fac40
000000c0006a5770: 000000c0001053a8 0000000000000000
000000c0006a5780: 00000000008255a0 000000c002600ae0
000000c0006a5790: 0000000000000000 0000000000000000
000000c0006a57a0: 000000c0006a57d0 0000000000441f81
<runtime.sigpanic+1041>
000000c0006a57b0: <000000000084ea00 0000000000c89080
000000c0006a57c0: 0000000000000000 0000000000000000
000000c0006a57d0: 0000000000000000 !0000000000000000
000000c0006a57e0: >0000000000000000 0000000000000000
000000c0006a57f0: 0000000000000000 0000000000000000
000000c0006a5800: 0000000000000000 0000000000000000
000000c0006a5810: 0000000000000000 0000000000000000
000000c0006a5820: 0000000000000000 0000000000000000
000000c0006a5830: 0000000000000000 0000000000000000
000000c0006a5840: 0000000000000000 0000000000000000
000000c0006a5850: 0000000000000000 0000000000000000
000000c0006a5860: 0000000000000000 0000000000000000
000000c0006a5870: 0000000000000000 0000000000000000
000000c0006a5880: 0000000000000000 0000000000000000
000000c0006a5890: 0000000000000000 0000000000000000
000000c0006a58a0: 0000000000000000 0000000000000000
000000c0006a58b0: 0000000000000000 0000000000000000
000000c0006a58c0: 0000000000000000 0000000000000000
000000c0006a58d0: 0000000000000000 0000000000000000
panic(0x84ea00, 0xc89080)
/usr/local/go/src/runtime/panic.go:565 +0x2c5
runtime: unexpected return pc for runtime.sigpanic called from 0x0
stack: frame={sp:0xc0006a57b0, fp:0xc0006a57e0}
stack=[0xc0006a2000,0xc0006a6000)
000000c0006a56b0: 0000000000000000 000000c0006a5710
000000c0006a56c0: 000000000042c3bf <runtime.preprintpanics+415>
000000000042cdd5 <runtime.fatalpanic+117>
000000c0006a56d0: 000000c0006a56e0 000000c002600ae0
000000c0006a56e0: 0000000000457950 <runtime.fatalpanic.func1+0>
000000c0006a5778
000000c0006a56f0: 000000c000105380 000000000042c7b5 <runtime.gopanic+709>
000000c0006a5700: 000000c0006a5720 000000c0006a56df
000000c0006a5710: 000000c0006a57a0 000000000042c7b5 <runtime.gopanic+709>
000000c0006a5720: 000000c0006a5778 00000000008f6920
000000c0006a5730: 000000c0030fac70 0000001000000010
000000c0006a5740: 00000000007d6b2e <main.(*Proc).executeRaw+158>
0000000000000000
000000c0006a5750: 000000c0006a5cf0 000000c000105380
000000c0006a5760: 0000000000000000 000000c0030fac40
000000c0006a5770: 000000c0001053a8 0000000000000000
000000c0006a5780: 00000000008255a0 000000c002600ae0
000000c0006a5790: 0000000000000000 0000000000000000
000000c0006a57a0: 000000c0006a57d0 0000000000441f81
<runtime.sigpanic+1041>
000000c0006a57b0: <000000000084ea00 0000000000c89080
000000c0006a57c0: 0000000000000000 0000000000000000
000000c0006a57d0: 0000000000000000 !0000000000000000
000000c0006a57e0: >0000000000000000 0000000000000000
000000c0006a57f0: 0000000000000000 0000000000000000
000000c0006a5800: 0000000000000000 0000000000000000
000000c0006a5810: 0000000000000000 0000000000000000
000000c0006a5820: 0000000000000000 0000000000000000
000000c0006a5830: 0000000000000000 0000000000000000
000000c0006a5840: 0000000000000000 0000000000000000
000000c0006a5850: 0000000000000000 0000000000000000
000000c0006a5860: 0000000000000000 0000000000000000
000000c0006a5870: 0000000000000000 0000000000000000
000000c0006a5880: 0000000000000000 0000000000000000
000000c0006a5890: 0000000000000000 0000000000000000
000000c0006a58a0: 0000000000000000 0000000000000000
000000c0006a58b0: 0000000000000000 0000000000000000
000000c0006a58c0: 0000000000000000 0000000000000000
000000c0006a58d0: 0000000000000000 0000000000000000
runtime.panicmem(...)
/usr/local/go/src/runtime/panic.go:82
runtime.sigpanic()
/usr/local/go/src/runtime/signal_unix.go:390 +0x411
created by main.main
/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:256
+0x1133
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OpenBSD/amd64 (ci-openbsd-multicore-9.c.syzkaller.internal) (tty00)

login:


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[Dmitry Vyukov]

I guess some machine memory corruptions.

#syz invalid

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