* Kevin O'Connor (kevin@xxxxxxxxxxxx) wrote: > On Wed, Mar 11, 2015 at 01:45:57PM +0000, Dr. David Alan Gilbert wrote: > > * Bandan Das (bsd@xxxxxxxxxx) wrote: > > > "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx> writes: > > > > while true; do (sleep 5; echo -e '\001cq\n')|/opt/qemu-try-world3/bin/qemu-system-x86_64 -machine pc-i440fx-2.0,accel=kvm -m 1024 -smp 128 -nographic -device sga 2>&1 | tee /tmp/qemu.op; grep "internal error" /tmp/qemu.op -q && break; done > > > > > [...] > > > > [root@virtlab413 qemu-world3]# git bisect bad > > > > 21f5826a04d38e19488f917e1eef22751490c769 is the first bad commit > > > > > > I can reproduce this on E5-2620 v2 with David's "while true" test. > > > (The emulation failure I mean, not the suberror 2 that Andrey is seeing) > > > The commit that seems to have introduced this is - > > > > > > commit 0673b7870063a3affbad9046fb6d385a4e734c19 > > > Author: Kevin O'Connor <kevin@xxxxxxxxxxxx> > > > Date: Sat May 24 10:49:50 2014 -0400 > > > > > > smp: Replace QEMU SMP init assembler code with C; run only in 32bit mode. > [...] > > Turning on debug logging > > ( -chardev file,id=log,path=/tmp/debugcon.$$ -device isa-debugcon,chardev=log,iobase=0x402 ) > > > > SeaBIOS (version rel-1.8.0-0-g4c59f5d-20150219_092859-nilsson.home.kraxel.org) > [...] > > Found 1 cpu(s) max supported 128 cpu(s) > > Something is very odd here. When I run the above command (on an older > AMD machine) I get: > > Found 128 cpu(s) max supported 128 cpu(s) > > That first value (1 vs 128) comes from QEMU (via cmos index 0x5f). > That is, during smp init, SeaBIOS expects QEMU to tell it how many > cpus are active, and SeaBIOS waits until that many CPUs check in from > its SIPI request before proceeding. > > I wonder if QEMU reported only 1 active cpu via that cmos register, > but more were actually active. If that was the case, it could > certainly explain the failure - as multiple cpus could be running > without the sipi trapoline in place. > > What does the log look like on a non-failure case? I had to drop down from 128 to get a working run with debug; here are two runs with -smp 20 the first one worked, the second one failed. Dave =========== Working =========== SeaBIOS (version rel-1.8.0-0-g4c59f5d-20150219_092859-nilsson.home.kraxel.org) No Xen hypervisor found. Running on QEMU (i440fx) Running on KVM RamSize: 0x40000000 [cmos] Relocating init from 0x000dea20 to 0x3ffaed30 (size 70160) Found QEMU fw_cfg RamBlock: addr 0x0000000000000000 len 0x0000000040000000 [e820] Moving pm_base to 0x600 CPU Mhz=2113 === PCI bus & bridge init === PCI: pci_bios_init_bus_rec bus = 0x0 === PCI device probing === Found 6 PCI devices (max PCI bus is 00) === PCI new allocation pass #1 === PCI: check devices === PCI new allocation pass #2 === PCI: IO: c000 - c04f PCI: 32: 0000000080000000 - 00000000fec00000 PCI: map device bdf=00:03.0 bar 1, addr 0000c000, size 00000040 [io] PCI: map device bdf=00:01.1 bar 4, addr 0000c040, size 00000010 [io] PCI: map device bdf=00:03.0 bar 6, addr feb80000, size 00040000 [mem] PCI: map device bdf=00:03.0 bar 0, addr febc0000, size 00020000 [mem] PCI: map device bdf=00:02.0 bar 6, addr febe0000, size 00010000 [mem] PCI: map device bdf=00:02.0 bar 2, addr febf0000, size 00001000 [mem] PCI: map device bdf=00:02.0 bar 0, addr fd000000, size 01000000 [prefmem] PCI: init bdf=00:00.0 id=8086:1237 PCI: init bdf=00:01.0 id=8086:7000 PIIX3/PIIX4 init: elcr=00 0c PCI: init bdf=00:01.1 id=8086:7010 PCI: init bdf=00:01.3 id=8086:7113 Using pmtimer, ioport 0x608 PCI: init bdf=00:02.0 id=1234:1111 PCI: init bdf=00:03.0 id=8086:100e PCI: Using 00:02.0 for primary VGA handle_smp: apic_id=12 handle_smp: apic_id=8 handle_smp: apic_id=14 handle_smp: apic_id=2 handle_smp: apic_id=13 handle_smp: apic_id=18 handle_smp: apic_id=1 handle_smp: apic_id=7 handle_smp: apic_id=3 handle_smp: apic_id=4 handle_smp: apic_id=6 handle_smp: apic_id=11 handle_smp: apic_id=10 handle_smp: apic_id=15 handle_smp: apic_id=9 handle_smp: apic_id=16 handle_smp: apic_id=17 handle_smp: apic_id=19 handle_smp: apic_id=5 Found 20 cpu(s) max supported 20 cpu(s) Copying PIR from 0x3ffbfc98 to 0x000f65a0 Copying MPTABLE from 0x00006db0/3ffa5c60 to 0x000f6340 Copying SMBIOS entry point from 0x00006db0 to 0x000f6320 Scan for VGA option rom Running option rom at c000:0003 Start SeaVGABIOS (version rel-1.8.0-0-g4c59f5d-20150219_092912-nilsson.home.kraxel.org) enter vga_post: a=00000010 b=0000ffff c=00000000 d=0000ffff ds=0000 es=f000 ss=0000 si=00000000 di=00006970 bp=00000000 sp=00006d0a cs=f000 ip=d239 f=0000 VBE DISPI: bdf 00:02.0, bar 0 VBE DISPI: lfb_addr=fd000000, size 16 MB Attempting to allocate VGA stack via pmm call to f000:d2f4 pmm call arg1=0 VGA stack allocated at ef1b0 Running option rom at c980:0003 Turning on vga text mode console set VGA mode 3 SeaBIOS (version rel-1.8.0-0-g4c59f5d-20150219_092859-nilsson.home.kraxel.org) All threads complete. Found 1 lpt ports Found 1 serial ports Searching bootorder for: /pci@i0cf8/isa@1/fdc@03f0/floppy@0 ATA controller 1 at 1f0/3f4/0 (irq 14 dev 9) ATA controller 2 at 170/374/0 (irq 15 dev 9) DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD] Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0 PS2 keyboard initialized All threads complete. Scan for option roms Running option rom at ca80:0003 pmm call arg1=1 pmm call arg1=0 pmm call arg1=1 pmm call arg1=0 Searching bootorder for: /pci@i0cf8/*@3 Searching bootorder for: /rom@genroms/kvmvapic.bin Searching bootorder for: HALT Running option rom at cb80:0003 Space available for UMB: ce000-ee800, f5e20-f6240 Returned 126976 bytes of ZoneHigh e820 map has 7 items: 0: 0000000000000000 - 000000000009f800 = 1 RAM 1: 000000000009f800 - 00000000000a0000 = 2 RESERVED 2: 00000000000f0000 - 0000000000100000 = 2 RESERVED 3: 0000000000100000 - 000000003ffdf000 = 1 RAM 4: 000000003ffdf000 - 0000000040000000 = 2 RESERVED 5: 00000000feffc000 - 00000000ff000000 = 2 RESERVED 6: 00000000fffc0000 - 0000000100000000 = 2 RESERVED enter handle_19: NULL Booting from Hard Disk... Boot failed: could not read the boot disk enter handle_18: NULL Booting from Floppy... floppy error: 40 00 00 00 00 01 02 Boot failed: could not read the boot disk enter handle_18: NULL Booting from DVD/CD... Device reports MEDIUM NOT PRESENT scsi_is_ready returned -1 Boot failed: Could not read from CDROM (code 0003) enter handle_18: NULL Booting from ROM... Booting from ca80:0361 =========== Broken =========== SeaBIOS (version rel-1.8.0-0-g4c59f5d-20150219_092859-nilsson.home.kraxel.org) No Xen hypervisor found. Running on QEMU (i440fx) Running on KVM RamSize: 0x40000000 [cmos] Relocating init from 0x000dea20 to 0x3ffaed30 (size 70160) Found QEMU fw_cfg RamBlock: addr 0x0000000000000000 len 0x0000000040000000 [e820] Moving pm_base to 0x600 CPU Mhz=2114 === PCI bus & bridge init === PCI: pci_bios_init_bus_rec bus = 0x0 === PCI device probing === Found 6 PCI devices (max PCI bus is 00) === PCI new allocation pass #1 === PCI: check devices === PCI new allocation pass #2 === PCI: IO: c000 - c04f PCI: 32: 0000000080000000 - 00000000fec00000 PCI: map device bdf=00:03.0 bar 1, addr 0000c000, size 00000040 [io] PCI: map device bdf=00:01.1 bar 4, addr 0000c040, size 00000010 [io] PCI: map device bdf=00:03.0 bar 6, addr feb80000, size 00040000 [mem] PCI: map device bdf=00:03.0 bar 0, addr febc0000, size 00020000 [mem] PCI: map device bdf=00:02.0 bar 6, addr febe0000, size 00010000 [mem] PCI: map device bdf=00:02.0 bar 2, addr febf0000, size 00001000 [mem] PCI: map device bdf=00:02.0 bar 0, addr fd000000, size 01000000 [prefmem] PCI: init bdf=00:00.0 id=8086:1237 PCI: init bdf=00:01.0 id=8086:7000 PIIX3/PIIX4 init: elcr=00 0c PCI: init bdf=00:01.1 id=8086:7010 PCI: init bdf=00:01.3 id=8086:7113 Using pmtimer, ioport 0x608 PCI: init bdf=00:02.0 id=1234:1111 PCI: init bdf=00:03.0 id=8086:100e PCI: Using 00:02.0 for primary VGA Found 1 cpu(s) max supported 20 cpu(s) Copying PIR from 0x3ffbfc98 to 0x000f65a0 Copying MPTABLE from 0x00006db0/3ffa5c60 to 0x000f6340 Copying SMBIOS entry point from 0x00006db0 to 0x000f6320 Scan for VGA option rom Running option rom at c000:0003 Start SeaVGABIOS (version rel-1.8.0-0-g4c59f5d-20150219_092912-nilsson.home.kraxel.org) enter vga_post: a=00000010 b=0000ffff c=00000000 d=0000ffff ds=0000 es=f000 ss=0000 si=00000000 di=00006970 bp=00000000 sp=00006d0a cs=f000 ip=d239 f=0000 VBE DISPI: bdf 00:02.0, bar 0 VBE DISPI: lfb_addr=fd000000, size 16 MB Attempting to allocate VGA stack via pmm call to f000:d2f4 pmm call arg1=0 VGA stack allocated at ef1b0 Running option rom at c980:0003 -- Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
