+RTS -xc and SIGINT handler gives seg fault

To reproduce this bug, save the attached file Bug.hs, 
run the following commands

  ghc -package posix -prof -auto-all Bug.hs
  ./a.out +RTS -xc

and then hit control-C.  The result is a SIGSEGV inside
fprintCCS().

Trac metadata

Trac field	Value
Version	None
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	ResolvedFixed
Component	Profiling
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug Trac import profiling labels

closed

Attached file Bug.2.hs ($42).

Logged In: YES 
user_id=135331

The crash is a null pointer dereference in fprintCCS().
Here's a gdb stack trace

(gdb) where
#0  0x08072cbf in fprintCCS ()
#1  0x00000000 in ?? ()
#2  0x08077fa1 in raiseAsyncWithLock ()
#3  0x402b60f0 in ?? ()
#4  0x0809f3e8 in MainCapability ()
#5  0x402c2014 in ?? ()
#6  0x0807b2d2 in raisezh_fast ()
#7  0x401a3440 in _IO_2_1_stdout_ () from /lib/libc.so.6
#8  0x0809f174 in hp_file ()
#9  0x402c2024 in ?? ()
#10 0x00000000 in ?? ()
#11 0x00000001 in ?? ()
#12 0x402c2024 in ?? ()
#13 0x00000002 in ?? ()
#14 0x00000000 in ?? ()
#15 0x0000001c in ?? ()
#16 0x08099314 in Main_CAFs_cc ()
#17 0x01db846e in ?? ()
#18 0x08099334 in Main_CAFs_cc_ccs ()

The crash occurs at fprintCCS+44:
0x08072c93 <fprintCCS+0>:       push   %esi
0x08072c94 <fprintCCS+1>:       push   %ebx
0x08072c95 <fprintCCS+2>:       sub    $0x14,%esp
0x08072c98 <fprintCCS+5>:       mov    0x20(%esp),%esi
0x08072c9c <fprintCCS+9>:       mov    0x24(%esp),%ebx
0x08072ca0 <fprintCCS+13>:      mov    %esi,0x4(%esp)
0x08072ca4 <fprintCCS+17>:      movl   $0x3c,(%esp)
0x08072cab <fprintCCS+24>:      call   0x80492c8 <_init+712>
0x08072cb0 <fprintCCS+29>:      test   %ebx,%ebx
0x08072cb2 <fprintCCS+31>:      je     0x8072d0e <fprintCCS+123>
0x08072cb4 <fprintCCS+33>:      cmp    $0x809d100,%ebx
0x08072cba <fprintCCS+39>:      je     0x8072d0e <fprintCCS+123>
0x08072cbc <fprintCCS+41>:      mov    0x4(%ebx),%eax
0x08072cbf <fprintCCS+44>:      mov    0x4(%eax),%eax

eax is zero.

Logged In: YES 
user_id=48280

This one has been fixed in 6.4.1 (out soon).

mentioned in commit 06ec241e

mentioned in commit c1fcd9b3

Trac metadata

Trac field	Value
TypeOfFailure	- → OtherFailure

added Pnormal label