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Re: [Bug 1914696] Re: aarch64: migration failed: Segmentation fault (cor

From: Li Zhijian
Subject: Re: [Bug 1914696] Re: aarch64: migration failed: Segmentation fault (core dumped)
Date: Fri, 5 Feb 2021 18:12:39 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 2/5/21 5:52 PM, Claudio Fontana wrote:
Hi LiZhiJian,

just one thing I noticed in your call stack, your $Subject talks about AArch64,
and you end up in arm_v7m_mmu_idx_for_secstate,

which means that ARM_FEATURE_M is detected, so definitely something looks off 
when it comes to the feature bits..
That's true, so i guessboldly migration across this FBC are not trustable.
the FBC changed the feature bits offset. Previously ARM_FEATURE = 11(source 
side), after this commit(destination side),  it turned ARM_FEATURE = 9.



On 2/5/21 4:04 AM, lizhijian wrote:
paste the call trace

(gdb) bt
#0  0x0000aaaac036a02c in armv7m_nvic_neg_prio_requested (opaque=0x0, 
secure=false) at ../hw/intc/armv7m_nvic.c:406
#1  0x0000aaaac014dcf4 in arm_v7m_mmu_idx_for_secstate_and_priv 
(env=0xaaaaca23d950, secstate=false, priv=true) at ../target/arm/m_helper.c:2837
#2  0x0000aaaac014dd8c in arm_v7m_mmu_idx_for_secstate (env=0xaaaaca23d950, 
secstate=false) at ../target/arm/m_helper.c:2848
#3  0x0000aaaac018aa6c in arm_mmu_idx_el (env=0xaaaaca23d950, el=1) at 
#4  0x0000aaaac018b788 in rebuild_hflags_internal (env=0xaaaaca23d950) at 
#5  0x0000aaaac018b80c in arm_rebuild_hflags (env=0xaaaaca23d950) at 
#6  0x0000aaaac007f928 in cpu_post_load (opaque=0xaaaaca233b10, version_id=22) 
at ../target/arm/machine.c:767
#7  0x0000aaaabfc8f508 in vmstate_load_state (f=0xaaaaca355520, vmsd=0xaaaac0d59ea8 
<vmstate_arm_cpu>, opaque=0xaaaaca233b10, version_id=22) at 
#8  0x0000aaaabfca3404 in vmstate_load (f=0xaaaaca355520, se=0xaaaaca2708b0) at 
#9  0x0000aaaabfca6410 in qemu_loadvm_section_start_full (f=0xaaaaca355520, 
mis=0xaaaaca204d90) at ../migration/savevm.c:2396
#10 0x0000aaaabfca6a8c in qemu_loadvm_state_main (f=0xaaaaca355520, 
mis=0xaaaaca204d90) at ../migration/savevm.c:2582
#11 0x0000aaaabfca6c34 in qemu_loadvm_state (f=0xaaaaca355520) at 
#12 0x0000aaaabfd95bf0 in process_incoming_migration_co (opaque=0x0) at 
#13 0x0000aaaac06c6248 in coroutine_trampoline (i0=-895198224, i1=43690) at 
#14 0x0000ffffa5071f90 in __startcontext () at 

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