bug#53296: Intermittent segfaults when parsing (?) custom package from repo.

[elaexuotee]

Hey Guix,

Recently working on a package, I have been encounting intermittent segfault
during a build.

The segfault seems to only occur when I have some error in my code that causes
a crash, and the segfaults tend to cluster, appearing unexpectedly for a few
build attempts, and then disappearing right as I think they are reproducible
and try to grab an strace or something. Unfortunately, that's about the extent
of information I have been able to gleen.

The latest segfault happened with the attached package definition. Note, the
offending code is at line 77, where I forgot to remove a docstring from a
variable that used to be a procedure.

Given that non-segfault runs seem to error out so early, is this better thought
to be an issue with Guile? FWIW, I see nothing interesting under
/var/log/guix-daemon.log. However, lines like following show up in the kernel
messages ring:

[318026.268095] guix[7419]: segfault at 18 ip 00007f56ef6a01a3 sp 
00007fff15588980 error 4 in libgc.so.1.4.3[7f56ef693000+1b000]
[318026.268116] Code: 8d 2d 71 93 01 00 90 4a 8d 04 e5 00 00 00 00 48 89 04 24 
49 8b 45 00 4e 8b 3c e0 4d 85 ff 74 2a 31 ed 0f 1f 44 00 00 4d 89 fe <4d> 8b 7f 
08 49 8b 7e 10 48 f7 d7 e8 6d 35 ff ff 85 c0 0f 84 3d 01
[318029.715621] guix[7761]: segfault at 10 ip 00007f9e80b919b9 sp 
00007fffd1b2ad20 error 4 in libgc.so.1.4.3[7f9e80b7b000+1b000]
[318029.715638] Code: f7 d2 48 21 d0 48 8b 13 4c 8d 3c c5 00 00 00 00 48 8b 04 
c2 48 85 c0 74 78 48 89 ea 48 f7 d2 eb 09 48 8b 40 08 48 85 c0 74 67 <48> 39 10 
75 f2 44 8b 05 03 1c 04 00 49 f7 d4 4c 89 60 10 41 bc 01
[318041.537171] guix[8660]: segfault at 10 ip 00007f0d2603c9b9 sp 
00007ffc72e998d0 error 4 in libgc.so.1.4.3[7f0d26026000+1b000]
[318041.537185] Code: f7 d2 48 21 d0 48 8b 13 4c 8d 3c c5 00 00 00 00 48 8b 04 
c2 48 85 c0 74 78 48 89 ea 48 f7 d2 eb 09 48 8b 40 08 48 85 c0 74 67 <48> 39 10 
75 f2 44 8b 05 03 1c 04 00 49 f7 d4 4c 89 60 10 41 bc 01


In the off chance it's helpful, below are some random machine details. Please
let me know if there is anything more pointed or specific I provide.

$ guix system describe

Generation 4    Jan 12 2022 18:59:48    (current)
  file name: /var/guix/profiles/system-4-link
  canonical file name: /gnu/store/sb01mnd31a9x2a0bznzlb2lsy91qwgk6-system
  label: GNU with Linux 5.15.13
  bootloader: grub-efi
  root device: label: "root"
  kernel: /gnu/store/bdf2yw10jr02mhyiwm05yp2qibywqz47-linux-5.15.13/bzImage
  channels:
    guix-bmw:
      repository URL: git://git@git.wilsonb.com/guix-bmw.git
      branch: master
      commit: 9fb59483371bb5d59fbd27e47baac88263410ac5
    nonguix:
      repository URL: https://gitlab.com/nonguix/nonguix
      branch: master
      commit: 023508df4804dbd9f39cb197525f166bc259f995
    guix:
      repository URL: https://git.savannah.gnu.org/git/guix.git
      branch: master
      commit: 9a2cf2c9232e229f7bb1ab065df2cf0740f65996
  configuration file: 
/gnu/store/pkf4vzlck0g32hkyvijmlcnp15vh8njv-configuration.scm

$ lscpu
Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Address sizes:                   43 bits physical, 48 bits virtual
Byte Order:                      Little Endian
CPU(s):                          8
On-line CPU(s) list:             0-7
Vendor ID:                       AuthenticAMD
Model name:                      AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
CPU family:                      23
Model:                           24
Thread(s) per core:              2
Core(s) per socket:              4
Socket(s):                       1
Stepping:                        1
Frequency boost:                 enabled
CPU max MHz:                     2100.0000
CPU min MHz:                     1400.0000
BogoMIPS:                        4191.75
Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep 
mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext 
fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid 
extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 
movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic 
cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext 
perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate ssbd ibpb 
vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt 
xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save 
tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic 
v_vmsave_vmload vgif overflow_recov succor smca sme sev sev_es
Virtualization:                  AMD-V
L1d cache:                       128 KiB (4 instances)
L1i cache:                       256 KiB (4 instances)
L2 cache:                        2 MiB (4 instances)
L3 cache:                        4 MiB (1 instance)
NUMA node(s):                    1
NUMA node0 CPU(s):               0-7
Vulnerability Itlb multihit:     Not affected
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled 
via prctl and seccomp
Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and 
__user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Full AMD retpoline, IBPB 
conditional, STIBP disabled, RSB filling
Vulnerability Srbds:             Not affected
Vulnerability Tsx async abort:   Not affected

$ lsmem
RANGE                                 SIZE  STATE REMOVABLE  BLOCK
0x0000000000000000-0x00000000bfffffff   3G online       yes   0-23
0x0000000100000000-0x00000005bfffffff  19G online       yes 32-183

Memory block size:       128M
Total online memory:      22G
Total offline memory:      0B

$ lsirq
IRQ     TOTAL NAME
RES 535178549 Rescheduling interrupts
LOC 262669447 Local timer interrupts
 82 125390312 PCI-MSI 2621440-edge amdgpu
CAL  66644945 Function call interrupts
TLB  28850164 TLB shootdowns
 12   7316777 IO-APIC 12-edge i8042
 77   2140601 PCI-MSI 2097156-edge iwlwifi:queue_4
  9   1653508 IO-APIC 9-fasteoi acpi
 73   1583984 PCI-MSI 2097152-edge iwlwifi:default_queue
IWI   1102407 IRQ work interrupts
 65    759824 PCI-MSI 3145728-edge ahci[0000:06:00.0]
  1    532374 IO-APIC 1-edge i8042
 76    253951 PCI-MSI 2097155-edge iwlwifi:queue_3
 75    186427 PCI-MSI 2097154-edge iwlwifi:queue_2
 74    168179 PCI-MSI 2097153-edge iwlwifi:queue_1
  7    100000 IO-APIC 7-fasteoi pinctrl_amd
 52     41159 PCI-MSI 524289-edge nvme0q1
 58     38523 PCI-MSI 524295-edge nvme0q7
 56     38206 PCI-MSI 524293-edge nvme0q5
 53     36960 PCI-MSI 524290-edge nvme0q2
 55     30286 PCI-MSI 524292-edge nvme0q4
 54     28877 PCI-MSI 524291-edge nvme0q3
 57     27421 PCI-MSI 524294-edge nvme0q6
 59     27142 PCI-MSI 524296-edge nvme0q8
MCP      8512 Machine check polls
 35      2317 PCI-MSI 2627584-edge xhci_hcd
 81      1290 PCI-MSI 2633728-edge snd_hda_intel:card1
 44      1215 PCI-MSI 2629632-edge xhci_hcd
 67       338 PCI-MSI 1572864-edge rtsx_pci
 80       316 PCI-MSI 2623488-edge snd_hda_intel:card0
  0        34 IO-APIC 2-edge timer
 78        33 PCI-MSI 2097157-edge iwlwifi:exception
 34        28 PCI-MSI 524288-edge nvme0q0
  8         1 IO-APIC 8-edge rtc0
 25         0 PCI-MSI 18432-edge PCIe PME, aerdrv
 26         0 PCI-MSI 20480-edge PCIe PME, aerdrv
 27         0 PCI-MSI 22528-edge PCIe PME, aerdrv
 28         0 PCI-MSI 28672-edge PCIe PME, aerdrv, pciehp
 29         0 PCI-MSI 133120-edge PCIe PME
 30         0 PCI-MSI 135168-edge PCIe PME
 36         0 PCI-MSI 2627585-edge xhci_hcd
 37         0 PCI-MSI 2627586-edge xhci_hcd
 38         0 PCI-MSI 2627587-edge xhci_hcd
 39         0 PCI-MSI 2627588-edge xhci_hcd
 40         0 PCI-MSI 2627589-edge xhci_hcd
 41         0 PCI-MSI 2627590-edge xhci_hcd
 42         0 PCI-MSI 2627591-edge xhci_hcd
 45         0 PCI-MSI 2629633-edge xhci_hcd
 46         0 PCI-MSI 2629634-edge xhci_hcd
 47         0 PCI-MSI 2629635-edge xhci_hcd
 48         0 PCI-MSI 2629636-edge xhci_hcd
 49         0 PCI-MSI 2629637-edge xhci_hcd
 50         0 PCI-MSI 2629638-edge xhci_hcd
 51         0 PCI-MSI 2629639-edge xhci_hcd
 60         0 PCI-MSI 524297-edge nvme0q9
 61         0 PCI-MSI 524298-edge nvme0q10
 62         0 PCI-MSI 524299-edge nvme0q11
 63         0 PCI-MSI 524300-edge nvme0q12
 71         0 PCI-MSI 2625537-edge ccp-1
 79         0 PCI-MSI 1048576-edge enp2s0
NMI         0 Non-maskable interrupts
SPU         0 Spurious interrupts
PMI         0 Performance monitoring interrupts
RTR         0 APIC ICR read retries
TRM         0 Thermal event interrupts
THR         0 Threshold APIC interrupts
DFR         0 Deferred Error APIC interrupts
MCE         0 Machine check exceptions
ERR         0 
MIS         0 
PIN         0 Posted-interrupt notification event
NPI         0 Nested posted-interrupt event
PIW         0 Posted-interrupt wakeup event

jsoftware.scm
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