Date: Thu, 21 May 2020 11:52:05 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores Message-ID: <bug-246630-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246630 Bug ID: 246630 Summary: stable/11 regression: base.txz reproducibility depends on number of cpu cores Product: Base System Version: Unspecified Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: fk@fabiankeil.de On a recent FreeBSD stable/11 the rescue binary content varies depending on the number of cpu cores. With a 2 core system I can reproduce the binaries from the official 11.4-BETA2 release, with a 4 core system I get different results: SHA256 (/images/FreeBSD/FreeBSD-11.4-BETA2-amd64-r361067-official/rescue/cp= ) =3D 3c96ab697fc721c226f99971863bcadbbbc73ccfec1abe2f04cbce60e3276a89 SHA256 (/images/FreeBSD/FreeBSD-11.4-BETA2-amd64-r361067-rebuild-2cores-t520/rescu= e/cp) =3D 3c96ab697fc721c226f99971863bcadbbbc73ccfec1abe2f04cbce60e3276a89 SHA256 (/images/FreeBSD/FreeBSD-11.4-BETA2-amd64-r361067-rebuild-4cores/rescue/cp)= =3D 06e0b2964901fa02ed2f4e02c1334cb82ce1d97f4a6fc7a2632a6f74b35955d1 Diffoscope seems to indicate that some offsets are different. The output starts with: --- FreeBSD/FreeBSD-11.4-BETA2-amd64-r361067-official/rescue/cp +++ FreeBSD/FreeBSD-11.4-BETA2-amd64-r361067-rebuild-4cores/rescue/cp =E2=94=9C=E2=94=80=E2=94=80 readelf --wide --sections {} =E2=94=82 @@ -1,16 +1,16 @@ =E2=94=82 There are 19 section headers, starting at offset 0xa18bb0: =E2=94=82=20=20 =E2=94=82 Section Headers: =E2=94=82 [Nr] Name Type Addr Off = Size ES Flg Lk Inf Al =E2=94=82 [ 0] NULL 0000000000000000 000000= 000000 00=20=20 0 0 0 =E2=94=82 [ 1] .note.tag NOTE 0000000000400190 000190= 000030 00=20=20 A 0 0 4 =E2=94=82 [ 2] .init PROGBITS 00000000004001c0 0001c0= 000018 00=20 AX 0 0 4 =E2=94=82 - [ 3] .text PROGBITS 0000000000400200 000200= 6dab08 00=20 AX 0 0 64 =E2=94=82 - [ 4] .fini PROGBITS 0000000000adad08 6dad08= 00000e 00=20 AX 0 0 4 =E2=94=82 + [ 3] .text PROGBITS 0000000000400200 000200= 6daa88 00=20 AX 0 0 64 =E2=94=82 + [ 4] .fini PROGBITS 0000000000adac88 6dac88= 00000e 00=20 AX 0 0 4 =E2=94=82 [ 5] .rodata PROGBITS 0000000000adb000 6db000= 216bd8 00=20=20 A 0 0 4096 =E2=94=82 [ 6] .eh_frame_hdr PROGBITS 0000000000cf1bd8 8f1bd8= 0245ec 00=20=20 A 0 0 4 =E2=94=82 [ 7] .eh_frame X86_64_UNWIND 0000000000d161c8 9161c8= 0bb90c 00=20=20 A 0 0 8 =E2=94=82 [ 8] .tdata PROGBITS 0000000000fd2000 9d2000= 000068 00 WAT 0 0 16 =E2=94=82 [ 9] .tbss NOBITS 0000000000fd2070 9d2068= 000840 00 WAT 0 0 16 =E2=94=82 [10] .ctors PROGBITS 0000000000fd2070 9d2070= 0000c0 00=20 WA 0 0 8 =E2=94=82 [11] .dtors PROGBITS 0000000000fd2130 9d2130= 000018 00=20 WA 0 0 8 =E2=94=9C=E2=94=80=E2=94=80 readelf --wide --debug-dump=3Dframes {} =E2=94=82 @@ -9894,21179 +9894,21195 @@ =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop =E2=94=82=20=20 =E2=94=82 -00005ee0 0000002c 00005ee4 FDE cie=3D00000000 pc=3D0043c780..004= 3d57c =E2=94=82 +00005ee0 0000002c 00005ee4 FDE cie=3D00000000 pc=3D0043c780..004= 3d4c3 =E2=94=82 DW_CFA_advance_loc: 1 to 0043c781 =E2=94=82 DW_CFA_def_cfa_offset: 16 =E2=94=82 DW_CFA_offset: r6 (rbp) at cfa-16 =E2=94=82 DW_CFA_advance_loc: 3 to 0043c784 =E2=94=82 DW_CFA_def_cfa_register: r6 (rbp) =E2=94=82 DW_CFA_advance_loc: 16 to 0043c794 =E2=94=82 DW_CFA_offset: r3 (rbx) at cfa-56 =E2=94=82 DW_CFA_offset: r12 (r12) at cfa-48 =E2=94=82 DW_CFA_offset: r13 (r13) at cfa-40 =E2=94=82 DW_CFA_offset: r14 (r14) at cfa-32 =E2=94=82 DW_CFA_offset: r15 (r15) at cfa-24 =E2=94=82 - DW_CFA_advance_loc2: 3554 to 0043d576 =E2=94=82 + DW_CFA_advance_loc2: 3369 to 0043d4bd =E2=94=82 DW_CFA_def_cfa: r7 (rsp) ofs 8 =E2=94=82 - DW_CFA_advance_loc: 1 to 0043d577 =E2=94=82 + DW_CFA_advance_loc: 1 to 0043d4be =E2=94=82 DW_CFA_def_cfa: r6 (rbp) ofs 16 =E2=94=82 DW_CFA_nop =E2=94=82 DW_CFA_nop The whole diff in text format has a size of 217M so I'm not attaching it. I first saw the issue after rebasing ElectroBSD on r360524 and confirmed that it still exists in r360986. The problem does not exist in r357496 and earlier but I don't yet know the exact revision when the problem was introduced. I can't reproduce the issue on FreeBSD-13.0-CURRENT amd64 using the 20200514-r361019 snapshot. I haven't tested 12/stable. --=20 You are receiving this mail because: You are the assignee for the bug.=
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