[New-bugs-announce] [issue45831] _Py_DumpASCII() writes characters one by one leading to corrupted tracebacks

[Łukasz Langa]

New submission from Łukasz Langa <lukasz at langa.pl>:

This is also a performance issue but I'm mostly concerned about the stdout corruption aspect. When more than one thread aborts at the same time, output ends up looking like the example below on the terminal. Unless you understand the issue is output written out byte-by-byte, you might get misled into seeing memory corruption.


Fatal Python error: Aborted

Fatal Python error: Fatal Python error: Fatal Python error: AbortedAborted



AbortedCurrent thread 0x

0000000110cf4dc0 (most recent call first):
Current thread 0xCurrent thread 0x  File 0000000110cf4dc0Current thread 0x (most recent call first):
0000000110cf4dc00000000110cf4dc0 (most recent call first):
 (most recent call first):
"  File   File   File /tmp"""////tctmtmppmpyp//tcchppoy/nytc-hptrohyonoton-t-rh-ormooaoontt-i--rnmomo/aatiLi-nni/m/baLLriiinbab/rrLraayirr/byyr//FFaFrrrayam/mrFeearwmaowermwoeorkrwkkossr//kPPsyy/ttPhsyo/tnhP.hyotnoh.nof.nrff.arfmarreaammwmeeoewwrowkro/orVrkkek///rVVseVierorsesnirsioson/ns3si.//o331.n1s.111///l13il.bi1/b1//pl/ypiltybht/ihopbno/n3yp3.t.1hy11o1/n/m3mu.tul1lth1ti/oipmnrpu3ol.rc1toe1cs/esmsiunsliignt/pigspr/yorncocscehysnrseocsihnsnirigoz/nesi.yzpnyen."cgph/yrs"oy, line nn95i, line  in c95z_ in e__h.e_pnertnyoet"ernr_i__z_
, line
e  File   File .95p in y_""_//"ttemmnppt//, line ccepp95yy in ttr_h_ho_on_-ner-nr
ooto  File ote-rm"_a/_ti
nm  File p//Lcitbp"yr-ta/hrtym/pFm/racaipmnye/owLtoihbrokrnnas-r/-Pyry/rtFoohooorttn-a.mfma-eirmnwaamoiernwk/osL//rikPL/yiVtbherroansrb.iyfo/nrFasr/ma3emw.e1owr1o/kr/lkiVsbe/r/Pspyyittohhnoosnn/.33f..r11a11m//elmwiuolbrt/kpi/pyVtrehorocsenis3os.n1is1n//g3/m.uq1ul1te/iulpeirsb.o/cppeyys"ts, line h102io in nng3g/.qe1utr
e1u  File a/"rme/uytsl/.mtppFi/yrpc"rpa, line yomt102ehcw in eosgnose-rirtnk
gs  File o//o"Pt/qty-mumpea/ticunpey/hLtosih.bopnrnya-".rr, line yfo/r102oF in argtaemm-temew
woaor  File rikkns/"L//Pi/ybtVtrmhapeor/nyc/.pFfyrrtaahmmoerwensow-rorkorsok/t/Pi-Vymoetarhisonnin.o/sfnLrs//ai33mb.er.1w11o1ar/rk/l/lyViieb/brF/srp/aipyomntyhseo/tn3w3.ho1.r11o1/k/lsnic3ob//n.cpPu1yr1yrt/ehmntuothl/otfinup.rtfourrcaeenss3s/.ip1nr1gom/c/qecusoesne.uwpceyuosr."rp, line ry236ke in /"_nVpt, line re/o102fcr in sueitgsuesr_toewn
...

----------
components: Interpreter Core
messages: 406480
nosy: lukasz.langa
priority: normal
severity: normal
stage: patch review
status: open
title: _Py_DumpASCII() writes characters one by one leading to corrupted tracebacks
type: behavior
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45831>
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