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

[Athos Ribeiro]

This also affects PostgreSQL, as discussed in
https://lore.kernel.org/lkml/20260403191942.21410-1-dipiets@amazon.it/.

A workaround for it involves making sure huge tables support is enabled
(see
https://lore.kernel.org/lkml/yr3inlzesdb45n6i6lpbimwr7b25kqkn37qzlvvzgad5hfd7ut@xv4cihno76wu/
and the whole thread discussion).

** Also affects: postgresql-18 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: postgresql-18 (Ubuntu)
       Status: New => Confirmed

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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:
  Invalid
Status in linux package in Ubuntu:
  Incomplete
Status in postgresql-18 package in Ubuntu:
  Confirmed

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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