Thought I'd ask, just in case: does anybody have any idea what could 
cause something like this:

  0: Foreign fp = 0xb6241a70, ra = 0x805931d
  1: Foreign fp = 0xb6241aa0, ra = 0x8055855
  2: Foreign fp = 0xb6241ad0, ra = 0x8061f33
  3: Foreign fp = 0xb6241b10, ra = 0x80622c6
  4: Foreign fp = 0xb6241b90, ra = 0x8062906
  5: Foreign fp = 0xb6241bc0, ra = 0x80645a5
  6: Foreign fp = 0xb6241c10, ra = 0x8064a79
  7: Foreign fp = 0xb6241c30, ra = 0x8054efb
  8: Foreign fp = 0xb6241c50, ra = 0x8053835
  9: Foreign fp = 0xb6241c80, ra = 0x8053964
 10: Foreign fp = 0xb6241cc0, ra = 0x8062833
 11: Foreign fp = 0xb6241d80, ra = 0x80662c0
 12: SB-KERNEL::COLLECT-GARBAGE
 13: (COMMON-LISP::FLET SB-THREAD::WITH-MUTEX-THUNK)
 14: (COMMON-LISP::FLET WITHOUT-INTERRUPTS-BODY-[CALL-WITH-MUTEX]293)
 15: (COMMON-LISP::FLET WITHOUT-INTERRUPTS-BODY-[SUB-GC]19)
 16: (SB-C::TL-XEP SB-KERNEL::SUB-GC)
 17: Foreign fp = 0xb6241f88, ra = 0x8066e4b
 18: Foreign fp = 0xb6241fa8, ra = 0x8052a0d
 19: Foreign fp = 0xb6241fc8, ra = 0x805365e
 20: Foreign fp = 0xb6241ff8, ra = 0x80586bb
 21: Foreign fp = 0xb6242028, ra = 0x805755b
 22: Foreign fp = 0xb62423e8, ra = 0xb7fcde70
 23: SB-IMPL::EXTRACT-NAME-TYPE-AND-VERSION
 24: SB-IMPL::PARSE-UNIX-NAMESTRING
 25: SB-IMPL::%PARSE-NAMESTRING
 26: (SB-C::VARARGS-ENTRY COMMON-LISP::PARSE-NAMESTRING)
 27: (SB-C::TL-XEP COMMON-LISP::MAKE-PATHNAME)
 28: WEBLOCKS::PUBLIC-FILE-RELATIVE-PATH
 29: (SB-C::TL-XEP WEBLOCKS::MAKE-LOCAL-DEPENDENCY)
 30: WEBLOCKS::DEPENDENCIES-BY-SYMBOL
 31: (COMMON-LISP::LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. 
SB-PCL::.ARG0.))
 32: (SB-PCL::FAST-METHOD WEBLOCKS::DEPENDENCIES KEYWORD::AROUND 
(COMMON-LISP::T))
 33: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 34: (SB-C::TL-XEP AULA::RENDER-WIDGETS-AS-LIST)
 35: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-BODY 
(AULA::EVENT-STORY)))
 36: (SB-C::VARARGS-ENTRY (COMMON-LISP::LAMBDA (WEBLOCKS::OBJ 
COMMON-LISP::&REST WEBLOCKS::ARGS)))
 37: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 38: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 39: (SB-C::TL-XEP AULA::RENDER-WIDGETS-AS-LIST)
 40: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-BODY 
(AULA::EVENTBOARD)))
 41: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-BODY 
KEYWORD::AROUND (AULA::EVENTBOARD)))
 42: (SB-C::VARARGS-ENTRY (COMMON-LISP::LAMBDA (WEBLOCKS::OBJ 
COMMON-LISP::&REST WEBLOCKS::ARGS)))
 43: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 44: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 45: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-BODY 
(WEBLOCKS::YUI-GRID-LAYOUT)))
 46: (SB-C::VARARGS-ENTRY (COMMON-LISP::LAMBDA (WEBLOCKS::OBJ 
COMMON-LISP::&REST WEBLOCKS::ARGS)))
 47: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 48: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 49: (SB-C::VARARGS-ENTRY (COMMON-LISP::LAMBDA (WEBLOCKS::OBJ 
COMMON-LISP::&REST WEBLOCKS::ARGS)))
 50: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 51: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 52: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-CHILDREN 
(WEBLOCKS::WIDGET)))
 53: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 54: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 55: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-BODY 
(WEBLOCKS::YUI-GRID-PAGE)))
 56: (SB-C::VARARGS-ENTRY (COMMON-LISP::LAMBDA (WEBLOCKS::OBJ 
COMMON-LISP::&REST WEBLOCKS::ARGS)))
 57: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 58: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 59: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET-CHILDREN 
(WEBLOCKS::WIDGET)))
 60: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::WITH-WIDGET-HEADER 
(COMMON-LISP::T COMMON-LISP::T)))
 61: (SB-C::TL-XEP (SB-PCL::FAST-METHOD WEBLOCKS::RENDER-WIDGET 
(COMMON-LISP::T)))
 62: (COMMON-LISP::FLET WITHOUT-INTERRUPTS-BODY-[CALL-WITH-MUTEX]293)
 63: SB-THREAD::CALL-WITH-MUTEX
 64: (SB-PCL::FAST-METHOD WEBLOCKS::HANDLE-NORMAL-REQUEST 
(WEBLOCKS::WEBLOCKS-WEBAPP))
 65: (SB-PCL::FAST-METHOD WEBLOCKS::HANDLE-CLIENT-REQUEST 
(WEBLOCKS::WEBLOCKS-WEBAPP))
 66: WEBLOCKS::CALL-IN-WEBAPP
 67: (SB-PCL::FAST-METHOD WEBLOCKS::HANDLE-CLIENT-REQUEST KEYWORD::AROUND 
(COMMON-LISP::T))
 68: (SB-PCL::FAST-METHOD WEBLOCKS::HANDLE-CLIENT-REQUEST KEYWORD::AROUND 
(AULA::AULA))
 69: (SB-PCL::FAST-METHOD HUNCHENTOOT::PROCESS-REQUEST (COMMON-LISP::T))
 70: (SB-PCL::FAST-METHOD HUNCHENTOOT::PROCESS-CONNECTION 
(HUNCHENTOOT::ACCEPTOR COMMON-LISP::T))
 71: (SB-PCL::FAST-METHOD HUNCHENTOOT::PROCESS-CONNECTION 
(WEBLOCKS::WEBLOCKS-ACCEPTOR COMMON-LISP::T))
 72: (SB-PCL::FAST-METHOD HUNCHENTOOT::PROCESS-CONNECTION KEYWORD::AROUND 
(HUNCHENTOOT::ACCEPTOR COMMON-LISP::T))
 73: (COMMON-LISP::LAMBDA ())
 74: (COMMON-LISP::FLET WITHOUT-INTERRUPTS-BODY-[BLOCK351]356)
 75: (COMMON-LISP::FLET SB-THREAD::WITH-MUTEX-THUNK)
 76: (COMMON-LISP::FLET WITHOUT-INTERRUPTS-BODY-[CALL-WITH-MUTEX]293)
 77: SB-THREAD::CALL-WITH-MUTEX
 78: SB-THREAD::INITIAL-THREAD-FUNCTION
 79: Foreign fp = 0xb6243398, ra = 0x8066e4b
 80: Foreign fp = 0xb62433b8, ra = 0x8052a0d
 81: Foreign fp = 0xb62433d8, ra = 0x805e140
 82: Foreign fp = 0xb62434c8, ra = 0xb7fc54fb

 The system is too badly corrupted or confused to continue at the Lisp
 level. If the system had been compiled with the SB-LDB feature, we'd drop
 into the LDB low-level debugger now. But there's no LDB in this build, so
 we can't really do anything but just exit, sorry.

When this happens, SBCL refuses to continue and drops into LDB. I had to 
disable LDB so that the application can be automatically restarted.

Reproduced on two different Linux systems. On several SBCL versions.

Any hints appreciated,
--J.

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