[GHC] #14705: ghc-iserv sometimes segfaults in profiled way
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Profiling | Version: 8.5 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime crash Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I have seen a few testsuite failures due to `ghc-iserv` crashes like these, {{{ --- ./profiling/should_run/T5363.run/T5363.stdout.normalised 2018-01-22 18:57:49.401773263 +0000 +++ ./profiling/should_run/T5363.run/T5363.run.stdout.normalised 2018-01-22 18:57:49.401773263 +0000 @@ -1 +1 @@ -1250030000000 +ghc-stage2: ghc-iserv terminated (-7) *** unexpected failure for T5363(ghci-ext-prof) Actual stdout output differs from expected: --- ./profiling/should_run/scc001.run/scc001.stdout.normalised 2018-01-22 18:57:45.177724120 +0000 +++ ./profiling/should_run/scc001.run/scc001.run.stdout.normalised 2018-01-22 18:57:45.177724120 +0000 @@ -1,3 +1,3 @@ True 3 -'a' +ghc-stage2: ghc-iserv terminated (-11) *** unexpected failure for scc001(ghci-ext-prof) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14705: ghc-iserv sometimes segfaults in profiled way
-------------------------------------+-------------------------------------
Reporter: bgamari | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Profiling | Version: 8.5
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Runtime crash | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by bgamari):
Looking at `scc001`, it looks like we get into trouble in the interpreter,
{{{
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff647f700 (LWP 108910)]
interpretBCO (cap=0x216c5c0 <MainCapability>) at rts/Interpreter.c:395
395 switch ( get_itbl(obj)->type ) {
(gdb) print obj
$1 = <optimized out>
(gdb) print get_itbl(obj)
value has been optimized out
(gdb) print get_itbl(obj)->type
value has been optimized out
(gdb) info locals
Sp = 0x420029fcc0
SpLim = 0x42002980d0
tagged_obj = 0x1c7b9b8
#14705: ghc-iserv sometimes segfaults in profiled way
-------------------------------------+-------------------------------------
Reporter: bgamari | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Profiling | Version: 8.5
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Runtime crash | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by Ben Gamari
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: Profiling | Version: 8.5 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4437 Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonmar): * owner: (none) => simonmar * priority: normal => highest * differential: => Phab:D4437 * milestone: => 8.4.1 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: Profiling | Version: 8.5 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4437 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonmar): FYI @bgamari, in the future we need to consider these things to be release-blocking. Running the interpreter with profiling is supposed to work (and we rely on it heavily at FB), but unfortunately we only have a few tests for it. Basically what should have happened here is that CI should have picked up the failing tests on the diff that broke it - so this is an argument for keeping profiling turned on in our new CircleCI setup. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: Profiling | Version: 8.5 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4437 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Duly noted. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14705: ghc-iserv sometimes segfaults in profiled way
-------------------------------------+-------------------------------------
Reporter: bgamari | Owner: simonmar
Type: bug | Status: new
Priority: highest | Milestone: 8.4.1
Component: Profiling | Version: 8.5
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Runtime crash | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D4437
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by Ben Gamari
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: simonmar Type: bug | Status: closed Priority: highest | Milestone: 8.4.1 Component: Profiling | Version: 8.5 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4437 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => fixed Comment: Merged for 8.4.1 as well. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14705: ghc-iserv sometimes segfaults in profiled way -------------------------------------+------------------------------------- Reporter: bgamari | Owner: simonmar Type: bug | Status: closed Priority: highest | Milestone: 8.4.2 Component: Profiling | Version: 8.5 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4437 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: 8.4.1 => 8.4.2 Comment: Unfortunately due to an oversight in the release preparation process, the fix for this issue was not included in the 8.4.1 release. It will, however, be present in the soon-to-arrive 8.4.2. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14705#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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