Every now and again I see firefox taking up an entire core on my
workstation. Today's thread of interest is #1:

$ pstack 19575
19575: /usr/lib/firefox/firefox
------------ lwp# 1 / thread# 1 ---------------
f21bf265 mmap (1000000, fa9d97f0, 0, 806df3a, 0, 0) + 15
0806df3a huge_palloc (8084b40, 34000000, 55600000, 807006d, e54bd608, bb03e498) + 64
0807006d je_realloc (e54bd608, e35fc0a0, 19504, 80693c9) + 8ee
080693c9 realloc (cde84f80, cde84f81, 6020e100, f159bcc2) + 45
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f15a4883 _ZN2js8GCMarker14drainMarkStackERNS_11SliceBudgetE (fa9d9b98, 0, 4378ac, f13376b7, e54bd608, fa9d9de8) + 4b3
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f13b4fb4 _ZNK2js7Wrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (fa9da250, fa9da518, 1, f13a8784) + 200
f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (fa9da278, fa9da260, fa9da1a8, f13a6de3) + 104
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f13a7809 _ZN2js10proxy_CallEP9JSContextjPN2JS5ValueE (4, e54bb000, 0, f14579ba) + 60
f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9da660, 6eabb3c0, f1b24834, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (651d54b0) + 87
f1457c2d _ZN2js13CallFromStackEP9JSContextRKN2JS8CallArgsE (0, 0, 0, f1652df7) + 1b
f1652df7 _ZN2js3jitL14DoCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEjPN2JS5ValueENS7_13MutableHandleIS8_EE (0, f1b24828, 0, 2a74025f, e54bb000, fa9da578) + 4a7
2a74025f ???????? (2acf6833, 8021, 7b460c70, ffffff8c, 7b460c60, ffffff8c)
651d54d0 ???????? (3444, e2d5f940, 4, d9d5d910, ffffff8c, 62e048c0)
2a73f909 ???????? (2acf6370, 5, fa9daa18, 0, e2d5f940, 0)
f162d642 _ZL13EnterBaselineP9JSContextRN2js3jit12EnterJitDataE (e54bb000, fa9da718, fa9da880, f1630993, e35cf448, f19105ac) + 15b
f1630993 _ZN2js3jit19EnterBaselineMethodEP9JSContextRNS_8RunStateE (e54bb000, fa9da7dc, fa9da880, f1457837) + 10b
f1457837 _ZN2js9RunScriptEP9JSContextRNS_8RunStateE (e2f2b000, fa9da868, fa9da870, f1457b3c, e54bb000, fa9da880) + 2d7
f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (e54bb000, fa9ddead, fa9da8f0, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000, e31e9438, ffffff8c, f1457c7c, fa9daa34, e4a252e8) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (e4a25280, f1b24818, fa9daa34, f13b4fb4, e54bb000, fa9daa58) + 46
f13b4fb4 _ZNK2js7Wrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (f1b24800, e2d07190, fa9daa98, f13a8784) + 200
f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (e487ac10, fa9dab8c, f257263e, f13a6de3) + 104
f13a6de3 _ZN2js5Proxy4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (e2d5f940, e54bb000, fa9dac68, f13a7809, e54bb000, fa9dab80) + eb
f13a7809 _ZN2js10proxy_CallEP9JSContextjPN2JS5ValueE (4, e54bb000, 0, f14579ba) + 60
f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dafb0, 79c58750, f1b24834, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54be37c) + 87
f1457c2d _ZN2js13CallFromStackEP9JSContextRKN2JS8CallArgsE (0, 0, 0, f1652df7) + 1b
f1652df7 _ZN2js3jitL14DoCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEjPN2JS5ValueENS7_13MutableHandleIS8_EE (fa9daed8, f1b24820, fa9db1d8, 2a74025f, e54bb000, fa9daed8) + 4a7
2a74025f ???????? (2acf59f4, 5821, 7ae939a0, ffffff8c, 52cd2840, ffffff8c)
648bf320 ???????? (2444, d9d40a80, 1, 0, ffffff82, 7b858a60)
2a73f909 ???????? (2acf5680, 2, fa9db368, 0, d9d40a80, 0)
f162d642 _ZL13EnterBaselineP9JSContextRN2js3jit12EnterJitDataE (e54bb000, fa9db068, fa9db1d0, f1630993, e2d104f0, f16e0134) + 15b
f1630993 _ZN2js3jit19EnterBaselineMethodEP9JSContextRNS_8RunStateE (e54bb000, fa9db12c, fa9db1d0, f1457837) + 10b
f1457837 _ZN2js9RunScriptEP9JSContextRNS_8RunStateE (d6ec4800, f16b8000, fa9db1c0, f1457b3c, e54bb000, fa9db1d0) + 2d7
f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9db3ac, 238be150, fa9db240, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000, e2f2b038, ffffff82, f1457c7c, fa9db384, e4a25208) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (e4a24fb8, f1b24818, fa9db384, f13b4fb4, e54bb000, fa9db3a8) + 46
f13b4fb4 _ZNK2js7Wrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (fa9db5ec, fa9db8a8, fa9db400, f13a8784) + 200
f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (e4a25088, 84, fa9db470, f13a6de3) + 104
f13a6de3 _ZN2js5Proxy4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (d9d40a80, e54bb000, fa9db4d0, f13a7809, e54bb000, fa9db4d0) + eb
f13a7809 _ZN2js10proxy_CallEP9JSContextjPN2JS5ValueE (e4a25088, ffffff8c, fa9db520, f14579ba) + 60
f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9db71c, 1, fa9db608, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (d9d40a80, fa9db720, ffffff82, f1457c7c, fa9db5fc, fa9db5f0) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (e54bb000, 29, fa9db738, f145c065, e54bb000, fa9db7d8) + 46
f145c065 _ZN2js19SpreadCallOperationEP9JSContextN2JS6HandleIP8JSScriptEEPhNS3_INS2_5ValueEEES9_S9_S9_NS2_13MutableHandleIS8_EE (e54bb000, fa9db760, 54df14a0, f1652875, e54bb000, fa9db7fc) + 427
f1652875 _ZN2js3jitL20DoSpreadCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEPN2JS5ValueENS7_13MutableHandleIS8_EE (f1b24820, fa9db834, e35d5d00, 2a7401e8, e54bb000, fa9db8d8) + 237
2a7401e8 ???????? (2ae0c852, 4021, 7b858a90, ffffff8c, 0, ffffff82)
54df14a0 ???????? (2042, d9d3f0d0, 1, 0, ffffff82, 7b858a90)
2ab50cd4 ???????? (2acf0414, 4821, 7b858af0, ffffff8c, 0, ffffff82)
5ddfe7a8 ???????? (2042, e2d5b080, 2, 0, ffffff82, d9d3f0d0)
2ab50cd4 ???????? (2acd3bc4, 4821, 7b858b50, ffffff8c, 0, ffffff82)
51417888 ???????? (3444, e2d5b060, 3, 0, ffffff82, d9d36c60)
2a73f909 ???????? (2acd34d0, 4, fa9dbe78, 0, e2d5b060, 0)
f162d642 _ZL13EnterBaselineP9JSContextRN2js3jit12EnterJitDataE (e54bb000, fa9dbb78, fa9dbce0, f1630993, 2422, 1) + 15b
f1630993 _ZN2js3jit19EnterBaselineMethodEP9JSContextRNS_8RunStateE (e54bb000, fa9dbc3c, fa9dbce0, f1457837) + 10b
f1457837 _ZN2js9RunScriptEP9JSContextRNS_8RunStateE (416b7318, 416b6f10, fa9dbcd0, f1457b3c, e54bb000, fa9dbce0) + 2d7
f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dbd50, e4a24728, 416b6c68, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000, e31eb038, ffffff82, f1457c7c, fa9dbe9c, 1) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (8daff0e4, f1b24818, fa9dbe94, f13b4fb4, e54bb000, fa9dbeb8) + 46
f13b4fb4 _ZNK2js7Wrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (6, 416b6c68, 416b7258, f13a8784) + 200
f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (f2232a40, 0, fa9dbf98, f13a6de3) + 104
f13a6de3 _ZN2js5Proxy4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (e2d5b060, 1010000, 10000, f13a7809, e54bb000, fa9dbfe0) + eb
f13a7809 _ZN2js10proxy_CallEP9JSContextjPN2JS5ValueE (e7b08be0, ec112a00, 0, f14579ba) + 60
f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dc22c, 3, fa9dc118, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e2d5b060, 0, ffffff82, f1457c7c, f16b8000, fa9dc100) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (e54bb000, 29, fa9dc248, f145c065, e54bb000, fa9dc2e8) + 46
f145c065 _ZN2js19SpreadCallOperationEP9JSContextN2JS6HandleIP8JSScriptEEPhNS3_INS2_5ValueEEES9_S9_S9_NS2_13MutableHandleIS8_EE (e54bb000, fa9dc270, 50a854c8, f1652875, e54bb000, fa9dc30c) + 427
f1652875 _ZN2js3jitL20DoSpreadCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEPN2JS5ValueENS7_13MutableHandleIS8_EE (2, ffffff81, e4a24f18, 2a7401e8, e54bb000, fa9dc3f8) + 237
2a7401e8 ???????? (2acd0acc, 4821, 6a5121a0, ffffff8c, 0, ffffff82)
50a854c8 ???????? (2444, e2d5f820, 2, d9d5d910, ffffff8c, 7b858bb0)
2a73f909 ???????? (2acd05c0, 3, fa9dc888, 0, e2d5f820, 0)
f162d642 _ZL13EnterBaselineP9JSContextRN2js3jit12EnterJitDataE (e54bb000, fa9dc588, fa9dc6f0, f1630993, e35cf448, f19105ac) + 15b
f1630993 _ZN2js3jit19EnterBaselineMethodEP9JSContextRNS_8RunStateE (e54bb000, fa9dc64c, fa9dc6f0, f1457837) + 10b
f1457837 _ZN2js9RunScriptEP9JSContextRNS_8RunStateE (e2f2d400, fa9dc6d0, fa9dc6e0, f1457b3c, e54bb000, fa9dc6f0) + 2d7
f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dc760, 7b8a36b0, fa9dc760, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000, e31e9438, ffffff8c, f1457c7c, fa9dc8a4, e4a24de0) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (e4a246c8, f1b24818, fa9dc8a4, f13b4fb4, e54bb000, fa9dc8c8) + 46
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f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (fa9dccf0, e54bb000, fa9dc990, f13a6de3) + 104
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f13a7809 _ZN2js10proxy_CallEP9JSContextjPN2JS5ValueE (2, e54bb000, 0, f14579ba) + 60
f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dce20, 7c32cd30, f1b24834, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000) + 87
f1457c2d _ZN2js13CallFromStackEP9JSContextRKN2JS8CallArgsE (0, 0, 0, f1652df7) + 1b
f1652df7 _ZN2js3jitL14DoCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEjPN2JS5ValueENS7_13MutableHandleIS8_EE (fa9dcd48, f1b24820, fa9dd048, 2a74025f, e54bb000, fa9dcd48) + 4a7
2a74025f ???????? (2ac26a8e, 6821, 6a5121f0, ffffff8c, d9d36300, ffffff8c)
248a0b88 ???????? (2444, d9d3f100, 1, 0, ffffff82, 7b460ca0)
2a73f909 ???????? (2ac26150, 2, fa9dd1d8, 0, d9d3f100, 0)
f162d642 _ZL13EnterBaselineP9JSContextRN2js3jit12EnterJitDataE (e54bb000, fa9dced8, fa9dd040, f1630993, e2d10748, f19105ac) + 15b
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f1457837 _ZN2js9RunScriptEP9JSContextRNS_8RunStateE (d6836000, e54bb000, fa9dd030, f1457b3c, e54bb000, fa9dd040) + 2d7
f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dd1b8, f1495b92, fa9dd0b0, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000, e2f2d438, ffffff82, f1457c7c, fa9dd1f4, e4a246a0) + 87
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f13b4fb4 _ZNK2js7Wrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (461fe100, e489ef38, fa9dd29c, f13a8784) + 200
f13a8784 _ZNK2js23CrossCompartmentWrapper4callEP9JSContextN2JS6HandleIP8JSObjectEERKNS3_8CallArgsE (f16b8000, fa9dd4e4, f1914040, f13a6de3) + 104
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f14579ba _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (fa9dd900, d9d365f0, f1b24834, f1457c03) + e1
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (e54bb000) + 87
f1457c2d _ZN2js13CallFromStackEP9JSContextRKN2JS8CallArgsE (0, 0, 0, f1652df7) + 1b
f1652df7 _ZN2js3jitL14DoCallFallbackEP9JSContextPNS0_13BaselineFrameEPNS0_15ICCall_FallbackEjPN2JS5ValueENS7_13MutableHandleIS8_EE (e4a24450, ffffff8c, 2, 2a74025f, e54bb000, fa9dd728) + 4a7
2a74025f ???????? (2ac2ab3e, f821, 7b460cd0, ffffff8c, 0, ffffff82)
3c0c3208 ???????? (3045, d9d629a0, 3, d9d36520, ffffff8c, 52cd2140)
2a73f774 ???????? (3042, d9d629a0, 3, d9d36520, ffffff8c, 52cd2140)
2aad1e94 ???????? (2ae556d3, 6821, dd48e9d0, ffffff85, 76d68340, ffffff8c)
47f1f428 ???????? (3444, d9d62820, 3, d9d36520, ffffff8c, 52cd2140)
2a73f909 ???????? (2ae552e0, 4, fa9ddcd8, 0, d9d62820, 0)
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f1630993 _ZN2js3jit19EnterBaselineMethodEP9JSContextRNS_8RunStateE (e54bb000, fa9dda7c, fa9ddb20, f1457837) + 10b
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f1457b3c _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE (e54bb4f0, e54bb000, fa9ddb90, f1457c03) + 263
f1457c03 _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE (fa9ddedc, fa9ddd1c, ffffff8c, f1457c7c, e54bb000, 52cd2140) + 87
f1457c7c _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE (fa9ddcd8, fa9ddcd8, fa9ddc28, f1326a7c, e54bb000, fa9ddee8) + 46
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