1

I have started reading Operating Systems: Three Easy Pieces, when I ran the example 2.1 on my MacBook Air M1 with 4 instances in parallel it spawned 4 unique processes but then my laptop crashed after 2-3 seconds. Please find the steps to replicate below:

simple-example.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <assert.h>
#include "common.h"
int
main(int argc, char *argv[]){
if (argc != 2) {
fprintf(stderr, "usage: cpu <string>\n"); exit(1);
    }
    char *str = argv[1]; 
    while (1) {
Spin(1);
        printf("%s\n", str);
    }
return 0; }

[common.h][1]


#ifndef __common_h__
#define __common_h__

#include <sys/time.h>
#include <sys/stat.h>
#include <assert.h>

double GetTime() {
    struct timeval t;
    int rc = gettimeofday(&t, NULL);
    assert(rc == 0);
    return (double) t.tv_sec + (double) t.tv_usec/1e6;
}

void Spin(int howlong) {
    double t = GetTime();
    while ((GetTime() - t) < (double) howlong)
    ; // do nothing in loop
}

#endif // __common_h__

The program above as explained by the book:

Figure 2.1 depicts our first program. It doesn’t do much. In fact, all it does is call Spin(), a function that repeatedly checks the time and returns once it has run for a second. Then, it prints out the string that the user passed in on the command line, and repeats, forever.

I have copied common.h from the linked github file

Compile:

~ gcc -v
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 12.0.5 (clang-1205.0.22.11)
Target: arm64-apple-darwin20.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
gcc -o cpu simple-example.c -Wall

running a single instance of the process with a string works fine:

./cpu "A"

running multiple instances crashes the laptop:

./cpu A & ; ./cpu B & ; ./cpu C & ; ./cpu D &

This spawns 4 processes and starts printing the strings A C B D in random order but then a purple light flashed and the laptop died.

Laptop Specification:

OS: Big Sur
Version: 11.5.2
Chip: M1
Memory: 8GB

Crash Report:

panic(cpu 0 caller 0xfffffe002fb3f460): "Spinlock timeout after 12584284 ticks, 0xfffffe0033898588 = fffffe1667d2dfe1"
Debugger message: panic
Memory ID: 0xff
OS release type: User
OS version: 20G95
Kernel version: Darwin Kernel Version 20.6.0: Wed Jun 23 00:26:27 PDT 2021; root:xnu-7195.141.2~5/RELEASE_ARM64_T8101
Fileset Kernelcache UUID: 15F4DFDFA9E0154FED96EA8997E65429
Kernel UUID: AC4A14A7-8A8E-3AE6-85A6-55E6B2502BF9
iBoot version: iBoot-6723.140.2
secure boot?: YES
Paniclog version: 13
KernelCache slide: 0x0000000027ec4000
KernelCache base:  0xfffffe002eec8000
Kernel slide:      0x0000000028a0c000
Kernel text base:  0xfffffe002fa10000
Kernel text exec base:  0xfffffe002fadc000
mach_absolute_time: 0xac2324506
Epoch Time:        sec       usec
  Boot    : 0x613ff694 0x00019680
  Sleep   : 0x00000000 0x00000000
  Wake    : 0x00000000 0x00000000
  Calendar: 0x613ffe14 0x00092243

CORE 0 recently retired instr at 0xfffffe002fc4d6a4
CORE 1 recently retired instr at 0xfffffe002fc4ed6c
CORE 2 recently retired instr at 0xfffffe002fc4ed6c
CORE 3 recently retired instr at 0xfffffe002fc4ed6c
CORE 4 recently retired instr at 0xfffffe002fc4ed70
CORE 5 recently retired instr at 0xfffffe002fc4ed70
CORE 6 recently retired instr at 0xfffffe002fc4ed70
CORE 7 recently retired instr at 0xfffffe002fc4ed70
CORE 0 PVH locks held: None
CORE 1 PVH locks held: None
CORE 2 PVH locks held: None
CORE 3 PVH locks held: None
CORE 4 PVH locks held: None
CORE 5 PVH locks held: None
CORE 6 PVH locks held: None
CORE 7 PVH locks held: None
CORE 0 is the one that panicked. Check the full backtrace for details.
CORE 1: PC=0xfffffe002faecc28, LR=0xfffffe002faecc28, FP=0x0000000000000000
CORE 2: PC=0xfffffe002fb251f0, LR=0xfffffe002fb251f0, FP=0xfffffe3f58b4bd50
CORE 3: PC=0xfffffe002faecc28, LR=0xfffffe002faecc28, FP=0x0000000000000000
CORE 4: PC=0xfffffe002fb25200, LR=0xfffffe003004f268, FP=0xfffffe30987c3db0
CORE 5: PC=0xfffffe002fb25200, LR=0xfffffe003004f268, FP=0xfffffe309b17bdb0
CORE 6: PC=0xfffffe002fb25200, LR=0xfffffe003004f268, FP=0xfffffe3f5966bdb0
CORE 7: PC=0xfffffe002fb25200, LR=0xfffffe003004f268, FP=0xfffffe309af7bdb0
Panicked task 0xfffffe167984a1f8: 100 pages, 4 threads: pid 778: redis-server
Panicked thread: 0xfffffe16797df300, backtrace: 0xfffffe3f5958b6d0, tid: 6902
          lr: 0xfffffe002fb2ab68  fp: 0xfffffe3f5958b740
          lr: 0xfffffe002fb2a94c  fp: 0xfffffe3f5958b7b0
          lr: 0xfffffe002fc541c8  fp: 0xfffffe3f5958b7d0
          lr: 0xfffffe002fc45674  fp: 0xfffffe3f5958b880
          lr: 0xfffffe002fae37e8  fp: 0xfffffe3f5958b890
          lr: 0xfffffe002fb2a5dc  fp: 0xfffffe3f5958bc20
          lr: 0xfffffe002fb2a5dc  fp: 0xfffffe3f5958bc90
          lr: 0xfffffe00302dce80  fp: 0xfffffe3f5958bcb0
          lr: 0xfffffe002fb3f460  fp: 0xfffffe3f5958bce0
          lr: 0xfffffe002fb3f2cc  fp: 0xfffffe3f5958bd00
          lr: 0xfffffe002fb25174  fp: 0xfffffe3f5958bd50
          lr: 0xfffffe003004f268  fp: 0xfffffe3f5958bdb0
          lr: 0xfffffe00301320e8  fp: 0xfffffe3f5958be40
          lr: 0xfffffe002fc45350  fp: 0xfffffe3f5958bef0
          lr: 0xfffffe002fae37e8  fp: 0xfffffe3f5958bf00

last started kext at 697335366: com.apple.filesystems.autofs    3.0 (addr 0xfffffe002f988000, size 16384)
loaded kexts:
com.apple.filesystems.autofs    3.0
com.apple.fileutil  20.036.15
com.apple.driver.AppleTopCaseHIDEventDriver 4050.1
com.apple.iokit.IOBluetoothSerialManager    8.0.5d7
com.apple.driver.AppleBiometricServices 1
com.apple.driver.DiskImages.ReadWriteDiskImage  493.0.0
com.apple.driver.DiskImages.UDIFDiskImage   493.0.0
com.apple.driver.DiskImages.RAMBackingStore 493.0.0
com.apple.driver.DiskImages.FileBackingStore    493.0.0
com.apple.filesystems.apfs  1677.141.1
com.apple.driver.BCMWLANFirmware4378.Hashstore  1
com.apple.driver.SEPHibernation 1
com.apple.driver.CoreKDL    1
com.apple.driver.AppleUSBDeviceNCM  5.0.0
com.apple.driver.AppleThunderboltIP 4.0.3
com.apple.driver.AppleSmartBatteryManager   161.0.0
com.apple.driver.AppleALSColorSensor    1.0.0d1
com.apple.driver.AppleAOPVoiceTrigger   11.5
com.apple.driver.AppleFileSystemDriver  3.0.1
com.apple.nke.l2tp  1.9
com.apple.filesystems.tmpfs 1
com.apple.driver.ApplePMP   1
com.apple.driver.ApplePMPFirmware   1
com.apple.driver.AppleSmartIO2  1
com.apple.IOTextEncryptionFamily    1.0.0
com.apple.filesystems.hfs.kext  556.100.11
com.apple.security.BootPolicy   1
com.apple.BootCache 40
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleEmbeddedSimpleSPINORFlasher  1
com.apple.driver.AppleDPDisplayTCON 1
com.apple.driver.AppleCS42L83Audio  442.26
com.apple.driver.AppleTAS5770LAmp   442.26
com.apple.driver.AppleSPMIPMU   1.0.1
com.apple.driver.AppleT8020SOCTuner 1
com.apple.driver.AppleT8103CLPCv3   1
com.apple.AGXG13G   173.28.7
com.apple.driver.AppleAVD   385
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com.apple.driver.usb.AppleUSBHostT8103  1
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com.apple.driver.AppleS8000AES  1
com.apple.driver.AppleS8000DWI  1.0.0d1
com.apple.driver.AppleS5L8960XWatchDogTimer 1
com.apple.driver.AppleInterruptController   1.0.0d1
com.apple.driver.AppleT8020DART 1
com.apple.driver.AppleBluetoothModule   1
com.apple.driver.AppleSamsungSerial 1.0.0d1
com.apple.driver.AppleBCMWLANBusInterfacePCIe   1
com.apple.driver.AppleS5L8920XPWM   1.0.0d1
com.apple.driver.AppleS5L8940XI2C   1.0.0d2
com.apple.driver.AppleSPIMC 1
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com.apple.iokit.IOUserEthernet  1.0.1
com.apple.driver.usb.AppleUSBUserHCI    1
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com.apple.nke.applicationfirewall   311
com.apple.kec.InvalidateHmac    1
com.apple.kext.triggers 1.0
com.apple.driver.AppleActuatorDriver    4440.3
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com.apple.driver.AppleMultitouchDriver  4440.3
com.apple.driver.AppleHSBluetoothDriver 4050.1
com.apple.driver.IOBluetoothHIDDriver   8.0.5d7
com.apple.iokit.IOAVBFamily 940.4
com.apple.plugin.IOgPTPPlugin   985.2
com.apple.iokit.IOEthernetAVBController 1.1.0
com.apple.driver.AppleMesaSEPDriver 100.99
com.apple.iokit.IOBiometricFamily   1
com.apple.driver.DiskImages.KernelBacked    493.0.0
com.apple.driver.AppleXsanScheme    3
com.apple.driver.AppleSEPHDCPManager    1.0.1
com.apple.driver.AppleTrustedAccessory  1
com.apple.iokit.AppleSEPGenericTransfer 1
com.apple.driver.IOBluetoothHostControllerPCIeTransport 8.0.5d7
com.apple.iokit.IOBluetoothHostControllerTransport  8.0.5d7
com.apple.driver.AppleConvergedIPCOLYBTControl  1
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com.apple.driver.AppleBluetoothDebug    1
com.apple.driver.AppleBTM   1.0.1
com.apple.driver.usb.networking 5.0.0
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com.apple.driver.AppleThunderboltDPAdapterFamily    8.1.4
com.apple.driver.AppleThunderboltUSBDownAdapter 1.0.4
com.apple.driver.AppleThunderboltPCIDownAdapter 4.1.1
com.apple.driver.AppleAOPAudio  16.2
com.apple.driver.AppleHIDTransportSPI   4400.35
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com.apple.driver.AppleInputDeviceSupport    4400.35
com.apple.nke.ppp   1.9
com.apple.driver.AppleSPU   1
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com.apple.AGXFirmwareKextG13GRTBuddy    173.28.7
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com.apple.driver.AppleHPM   3.4.4
com.apple.driver.AppleStockholmControl  1.0.0
com.apple.driver.AppleCSEmbeddedAudio   442.26
com.apple.driver.AppleEmbeddedAudio 442.26
com.apple.iokit.AppleARMIISAudio    80.34.1
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com.apple.kec.pthread   1
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com.apple.kec.Libm  1



** Stackshot Succeeded ** Bytes Traced 364005 (Uncompressed 950640) **

This is happened both the times I run the code, Geekbench 5 is running fine result

Is this some problem with code or M1 SOC issue?

How do I explain this to apple to get a replacement? I bought this laptop on August 4th without apple care

Update: @DarkDust suggested killing redis and trying, still crashing.

18
  • Spinlock timeout… and Panicked task … pid 778: redis-server This looks like an OS issue. You're overwhelming the system, another task is (indirectly?) using a kernel spin lock and that is held for too long. You may want to report this to Apple using Feedback.
    – DarkDust
    Sep 14 at 8:09
  • Should I expect this to happen with every MacBook Air m1? or is this laptop specific issue? Sep 14 at 8:13
  • You should not expect this to happen, it's a bug (IMHO). An OS bug.
    – DarkDust
    Sep 14 at 8:15
  • It's happening every time I run this code for me Sep 14 at 8:16
  • Great! Then report it to Apple if you can reproduce it every time. For example, via apple.com/feedback
    – DarkDust
    Sep 14 at 8:19
1

I just tried on an M1 Mini, it already crashes with three processes, without printing any letter at all.

./cpu A & ./cpu B & ./cpu C &

Best to report it to Apple then.

8
  • It's not happening to everyone, /u/BadWulfy on Reddit tried the same and was able to run the program without any crashes! Link Sep 14 at 11:55
  • @ArpitAgarwal Did that user run it on an M1 Mac?
    – nohillside
    Sep 14 at 11:56
  • I assumed that the user would use an M1, anyway I have asked to confirm his SOC. Sep 14 at 11:59
  • The use confirmed they have a M1 Macbook Air Sep 14 at 12:00
  • can you add your crash logs here so that we can compare them to mine, it would be really helpfull Sep 14 at 12:01

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