0002680: SIGSEGV, Segmentation fault. when running popular site parallel test

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0002680

NetSurf

Javascript

public

2019-07-08 08:58

2019-07-19 09:22

Reporter

Vincent Sanders

Assigned To

Vincent Sanders

Severity

crash

Reproducibility

always

Status

closed

Resolution

fixed

Product Version

3.9

Target Version

3.9

Fixed in Version

3.9

Summary

0002680: SIGSEGV, Segmentation fault. when running popular site parallel test

Description

when running the popular site parallel test nsmonkey exits with segmentation fault while closing windows

Steps To Reproduce

run test with

./test/monkey_driver.py -m ./nsmonkey -t ../netsurf-test/monkey-test/popular-sites-parallel.yaml -w 'gdbserver :12345'

use gdb:
target remote localhost:12345
and continue execution

Additional Information

Thread 1 "nsmonkey" received signal SIGSEGV, Segmentation fault.
0x0000555562967e10 in ?? ()
(gdb) bt
#0 0x0000555562967e10 in ?? ()
#1 0x000055555566266a in duk_heap_mem_alloc (heap=0x555555beb270, size=66)
    at content/handlers/javascript/duktape/duktape.c:50191
0000002 0x00005555556629bf in duk__strtable_alloc_hstring (extdata=0x0, strhash=297939073, blen=33,
    str=0x555555761a58 "\377\377NETSURF_DUKTAPE_WindowCallbacks", heap=0x555555beb270)
    at content/handlers/javascript/duktape/duktape.c:52441
#3 duk__strtable_do_intern (strhash=297939073, blen=33,
    str=0x555555761a58 "\377\377NETSURF_DUKTAPE_WindowCallbacks", heap=0x555555beb270)
    at content/handlers/javascript/duktape/duktape.c:52441
#4 duk_heap_strtable_intern (heap=0x555555beb270,
    str=0x555555761a58 "\377\377NETSURF_DUKTAPE_WindowCallbacks", blen=<optimized out>)
    at content/handlers/javascript/duktape/duktape.c:52579
#5 0x0000555555663cfd in duk_heap_strtable_intern_checked (thr=0x5555618826d0,
    str=<optimized out>, blen=<optimized out>)
    at content/handlers/javascript/duktape/duktape.c:52625
#6 0x0000555555663d3c in duk_push_lstring (thr=0x5555618826d0, str=<optimized out>,
    len=<optimized out>) at content/handlers/javascript/duktape/duktape.c:21996
#7 0x0000555555674dbc in duk_get_prop_string (thr=thr@entry=0x5555618826d0, obj_idx=1,
    obj_idx@entry=-1, key=key@entry=0x555555761a58 "\377\377NETSURF_DUKTAPE_WindowCallbacks")
    at content/handlers/javascript/duktape/duktape.c:16572
#8 0x0000555555601854 in window_call_callback (clear_entry=true, handle=784, ctx=0x5555618826d0)
    at build/Linux-monkey/duktape/window.c:87
#9 window_schedule_callback (p=0x55555785b250) at build/Linux-monkey/duktape/window.c:132
#10 0x00005555556bcda5 in monkey_schedule_run () at frontends/monkey/schedule.c:165
#11 0x0000555555588d64 in monkey_run () at frontends/monkey/main.c:277
#12 main (argc=<optimized out>, argv=<optimized out>) at frontends/monkey/main.c:408
(gdb) up
#1 0x000055555566266a in duk_heap_mem_alloc (heap=0x555555beb270, size=66)
    at content/handlers/javascript/duktape/duktape.c:50191
50191 res = heap->alloc_func(heap->heap_udata, size);
(gdb) p heap
$1 = (duk_heap *) 0x555555beb270
(gdb) p *heap
$2 = {flags = 1796561840, alloc_func = 0x555562967e10, realloc_func = 0x0, free_func = 0x0,
  heap_udata = 0x555555a1af90, fatal_func = 0x555555585eb8 <duk_default_fatal_handler>,
  heap_allocated = 0x55555782ae60, refzero_list = 0x0, finalize_list = 0x0, activation_free = 0x0,
  catcher_free = 0x0, ms_trigger_counter = 705016, ms_recursion_depth = 0, ms_base_flags = 0,
  ms_running = 0, ms_prevent_count = 1, pf_prevent_count = 1, pf_skip_finalizers = 1,
  creating_error = 0, augmenting_error = 0, lj = {jmpbuf_ptr = 0x0, type = 0, iserror = 0,
    value1 = {t = 2, v_extra = 0, v = {d = 4.6355940598961254e-310, i = 1907732976,
        fi = 93825468314096, voidptr = 0x555571b5b1f0, hstring = 0x555571b5b1f0,
        hobject = 0x555571b5b1f0, hcompfunc = 0x555571b5b1f0, hnatfunc = 0x555571b5b1f0,
        hthread = 0x555571b5b1f0, hbuffer = 0x555571b5b1f0, heaphdr = 0x555571b5b1f0,
        lightfunc = 0x555571b5b1f0}}, value2 = {t = 2, v_extra = 0, v = {d = 0, i = 0, fi = 0,
        voidptr = 0x0, hstring = 0x0, hobject = 0x0, hcompfunc = 0x0, hnatfunc = 0x0,
        hthread = 0x0, hbuffer = 0x0, heaphdr = 0x0, lightfunc = 0x0}}},
  heap_thread = 0x555555bf5290, curr_thread = 0x0, heap_object = 0x555555c09f50,
  call_recursion_depth = 0, call_recursion_limit = 1000, hash_seed = 1438558069, rnd_state = {
    15748112546035340805, 8073118506461634612}, sym_counter = {0, 0}, strtable = 0x55556af890c0,
  st_mask = 8191, st_size = 8192, st_count = 4650, st_resizing = 0, strcache = {{h = 0x0,
      bidx = 0, cidx = 0}, {h = 0x0, bidx = 0, cidx = 0}, {h = 0x0, bidx = 0, cidx = 0}, {h = 0x0,
      bidx = 0, cidx = 0}}, litcache = {{addr = 0x0, h = 0x0} <repeats 83 times>, {addr = 0x0,
      h = 0x55555f538270}, {addr = 0x0, h = 0x0} <repeats 59 times>, {addr = 0x0,
      h = 0x55556ac65800}, {addr = 0x0, h = 0x0} <repeats 58 times>, {addr = 0x0,
      h = 0x5555629b7380}, {addr = 0x0, h = 0x0} <repeats 53 times>}, strs = {0x555555bec8f0,
    0x555555bec930, 0x555555bec960, 0x555555bec990, 0x555555bec9d0, 0x555555beca00,
    0x555555beca40, 0x555555beca70, 0x555555becaa0, 0x555555becad0, 0x555555becb00,
    0x555555bf31c0, 0x555555bf31f0, 0x555555bf3220, 0x555555bf3250, 0x555555bf3280,
    0x555555bf32b0, 0x555555bf32f0, 0x555555bf3330, 0x555555bf3370, 0x555555bf33b0,
    0x555555bf33f0, 0x555555bf3430, 0x555555bf3470, 0x555555bf34b0, 0x555555bf34f0,
    0x555555bf3530, 0x555555bf3570, 0x555555bf35a0, 0x555555bf35d0, 0x555555bf3600,
    0x555555bf3630, 0x555555bf3660, 0x555555bf3690, 0x555555bf36c0, 0x555555bf36f0,
    0x555555bf3730, 0x555555bf3770, 0x555555bf37b0, 0x555555bf37e0, 0x555555bf3820,
    0x555555bf3850, 0x555555bf3890, 0x555555bf38d0, 0x555555bf3910, 0x555555bf3940,
    0x555555bf3980, 0x555555bf39c0, 0x555555bf3a00, 0x555555bf3a30, 0x555555bf3a60,
    0x555555bf3aa0, 0x555555bf3ae0, 0x555555bf3b10, 0x555555bf3b40, 0x555555bf3b70,
    0x555555bf3ba0, 0x555555bf3bd0, 0x555555bf3c00, 0x555555bf3c40, 0x555555bf3c70,
    0x555555bf3cb0, 0x555555bf3cf0, 0x555555bf3d20, 0x555555bf3d50, 0x555555bf3d80,
--Type <RET> for more, q to quit, c to continue without paging--
    0x555555bf3db0, 0x555555bf3df0, 0x555555bf3e30, 0x555555bf3e60, 0x555555bf3e90,
    0x555555bf3ec0, 0x555555bf3f00, 0x555555bf3f40, 0x555555bf3f70, 0x555555bf3fa0,
    0x555555bf3fd0, 0x555555bf4010, 0x555555bf4050, 0x555555bf4090, 0x555555bf40e0,
    0x555555bf4120, 0x555555bf4160, 0x555555bf41a0, 0x555555bf41d0, 0x555555bf4200,
    0x555555bf4230, 0x555555bf4260, 0x555555bf4290, 0x555555bf42c0, 0x555555bf42f0,
    0x555555bf4330, 0x555555bf4370, 0x555555bf43a0, 0x555555bf43e0, 0x555555bf4410,
    0x555555bf4440, 0x555555bf4470, 0x555555bf44b0, 0x555555bf44f0, 0x555555bf4520,
    0x555555bf4550, 0x555555bf4590, 0x555555bf45c0, 0x555555bf45f0, 0x555555bf4630,
    0x555555bf4660, 0x555555bf4690, 0x555555bf46c0, 0x555555bf4700, 0x555555bf4740,
    0x555555bf4770, 0x555555bf47a0, 0x555555bf47d0, 0x555555bf4800, 0x555555bf4830,
    0x555555bf4870, 0x555555bf48b0, 0x555555bf48f0, 0x555555bf4930, 0x555555bf4970,
    0x555555bf49b0, 0x555555bf49e0, 0x555555bf4a10, 0x555555bf4a40, 0x555555bf4a80,
    0x555555bf4ac0, 0x555555bf4af0, 0x555555bf4b20, 0x555555bf4b50, 0x555555bf4b80,
    0x555555bf4bb0, 0x555555bf4be0, 0x555555bf4c20, 0x555555bf4c50, 0x555555bf4c80,
    0x555555bf4cc0, 0x555555bf4cf0, 0x555555bf4d20, 0x555555bf4d50, 0x555555bf4d80,
    0x555555bf4db0, 0x555555bf4de0, 0x555555bf4e10, 0x555555bf4e40, 0x555555bf4e70,
    0x555555bf4ea0, 0x555555bf4ed0, 0x555555bf4f00, 0x555555bf4f30, 0x555555bf4f60,
    0x555555bf4f90, 0x555555bf4fc0, 0x555555bf4ff0, 0x555555bf5020, 0x555555bf5050,
    0x555555bf5080, 0x555555bf50b0, 0x555555bf50f0, 0x555555bf5130, 0x555555bf5160,
    0x555555bf5190, 0x555555bf51c0, 0x555555bf5200, 0x555555bf5230, 0x555555bf5260}}

(gdb) list
50186 res = NULL;
50187 DUK_UNREF(res);
50188 goto skip_attempt;
50189 }
50190 #endif
50191 res = heap->alloc_func(heap->heap_udata, size);
50192 if (DUK_LIKELY(res || size == 0)) {
50193 /* For zero size allocations NULL is allowed. */
50194 return res;
50195 }
(gdb) p heap->heap_udata
$3 = (void *) 0x555555a1af90
(gdb) p size
$4 = 66
(gdb) p res
$5 = <optimized out>
(gdb)

Notes
~0001985 Vincent Sanders (administrator) 2019-07-12 13:47	it turns out that when the browser window destroyed the javascript context that the dukky interface was not closing any active container in the context which resulted in callbacks and various other memory references to freed memory. Fixed by simply destroying the active js container before freeing the context

~0001989 Vincent Sanders (administrator) 2019-07-19 09:22	we believe this issue has been fixed in NetSurf 3.9

Date Modified	Username	Field	Change
Issue History
2019-07-08 08:58	Vincent Sanders	New Issue
2019-07-12 13:47	Vincent Sanders	Assigned To	=> Vincent Sanders
2019-07-12 13:47	Vincent Sanders	Status	new => resolved
2019-07-12 13:47	Vincent Sanders	Resolution	open => fixed
2019-07-12 13:47	Vincent Sanders	Fixed in Version	=> 3.9
2019-07-12 13:47	Vincent Sanders	Target Version	=> 3.9
2019-07-12 13:47	Vincent Sanders	Fixed in CI build #	=> 4716
2019-07-12 13:47	Vincent Sanders	Note Added: 0001985
2019-07-19 09:22	Vincent Sanders	Status	resolved => closed
2019-07-19 09:22	Vincent Sanders	Note Added: 0001989

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