[Bug 2146842] [NEW] tcmalloc RSEQ ABI violation causes crashes on linux kernel 6.19+

[Lena Voytek]

Public bug reported:

With the 6.19 release of the Linux kernel, upstream MongoDB now
experiences crashes after ~30 seconds due to an RSEQ error from
tcmalloc. The unit test //tcmalloc/testing:background_test_no_glibc_rseq
notably also fails on 6.19 and 7.0, and may be due to the following
commit -
https://lore.kernel.org/all/20251027084307.578058898@linutronix.de/

While mongodb is not supported in the Ubuntu archive, there are other
packages using tcmalloc such as mysql-8.4 which may be affected.

** Affects: pkg-google-perftools
     Importance: Unknown
         Status: New

** Affects: google-perftools (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: github.com/google/tcmalloc/issues #292
   https://github.com/google/tcmalloc/issues/292

** Also affects: pkg-google-perftools via
   https://github.com/google/tcmalloc/issues/292
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/2146842

Title:
  tcmalloc RSEQ ABI violation causes crashes on linux kernel 6.19+

Status in Google Perftools Packaging:
  New
Status in google-perftools package in Ubuntu:
  New

Bug description:
  With the 6.19 release of the Linux kernel, upstream MongoDB now
  experiences crashes after ~30 seconds due to an RSEQ error from
  tcmalloc. The unit test
  //tcmalloc/testing:background_test_no_glibc_rseq notably also fails on
  6.19 and 7.0, and may be due to the following commit -
  https://lore.kernel.org/all/20251027084307.578058898@linutronix.de/

  While mongodb is not supported in the Ubuntu archive, there are other
  packages using tcmalloc such as mysql-8.4 which may be affected.

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