[Qemu-devel] 'tcg fatal error' with qemu v2.6.0-rc3 (bisected)

[Guenter Roeck]

Hi,

when running qemu version 2.6.0-rc3, I get the following error message.

/opt/buildbot/qemu/qemu/tcg/tcg.c:1769: tcg fatal error

qemu command line is as follows.

qemu-system-ppc64 -M mpc8544ds \
        -cpu e5500 \
        -m 1024 -kernel arch/powerpc/boot/uImage -initrd busybox-ppc.cpio \
        -nographic -vga none -monitor null -no-reboot \
        --append "rdinit=/sbin/init console=tty console=ttyS0" \
        -machine "dt_compatible=fsl,,P5020DS"

Files are from my test suite at https://github.com/groeck/linux-build-test.

Bisect points to commit 40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889 ("tcg:
Introduce temp_load"). Bisect log is attached.

Guenter

---
# bad: [f419a626c76bcb26697883af702862e8623056f9] usb/uhci: move pid check
# good: [a8c40fa2d667e585382080db36ac44e216b37a1c] Update version for v2.5.0 
release
git bisect start 'HEAD' 'v2.5.0'
# bad: [253785e3b96f48c52568c312cec0a5ec596c527f] scripts/feature_to_c.sh: 
Include qemu/osdep.h rather than config.h
git bisect bad 253785e3b96f48c52568c312cec0a5ec596c527f
# good: [f4109dba216f2df61a6098fdd7a6f2d2be4ac848] scripts/kvm/kvm_stat: Moved 
DebugfsProvider
git bisect good f4109dba216f2df61a6098fdd7a6f2d2be4ac848
# good: [8983b670f62ab5e5e8dd2690bf8304123651bfe5] block: qemu-iotests - add 
test for snapshot, commit, snapshot bug
git bisect good 8983b670f62ab5e5e8dd2690bf8304123651bfe5
# good: [d7bea75d35a44023efc9d481d3a1a2600677b2ef] qapi: Avoid use of misnamed 
DO_UPCAST()
git bisect good d7bea75d35a44023efc9d481d3a1a2600677b2ef
# bad: [c9f19dff101e2c2cf3fa3967eceec2833e845e40] Merge remote-tracking branch 
'remotes/bonzini/tags/for-upstream' into staging
git bisect bad c9f19dff101e2c2cf3fa3967eceec2833e845e40
# bad: [977a82ab56daac83623d730174f47d5a7edd73c9] configure: sanity check the 
glib library that pkg-config finds
git bisect bad 977a82ab56daac83623d730174f47d5a7edd73c9
# good: [a86156401559cb4401cf9ecc704faeab6fc8bb19] qmp: Fix reference-counting 
of qnull on empty output visit
git bisect good a86156401559cb4401cf9ecc704faeab6fc8bb19
# good: [12b9b11a2743002232098afb41810f1c0cb211a0] tcg: Change temp_sync 
argument to TCGTemp
git bisect good 12b9b11a2743002232098afb41810f1c0cb211a0
# bad: [ac1be2ae6b2995b99430c48329eb971b0281acf1] Merge remote-tracking branch 
'remotes/armbru/tags/pull-qapi-2016-02-09' into staging
git bisect bad ac1be2ae6b2995b99430c48329eb971b0281acf1
# good: [423aeaf219890e8a7311dbeef1a925020027c2ea] qapi: Add missing JSON files 
in build dependencies
git bisect good 423aeaf219890e8a7311dbeef1a925020027c2ea
# bad: [40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889] tcg: Introduce temp_load
git bisect bad 40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889
# good: [b13eb728d33deaa53efc0dcef557da998e6ec40e] tcg: Change temp_save 
argument to TCGTemp
git bisect good b13eb728d33deaa53efc0dcef557da998e6ec40e
# first bad commit: [40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889] tcg: Introduce 
temp_load