On 02/13/2018 05:20 PM, Cyril Bur wrote:
> Hello all,

Does reverting commit 02ef6dd8109b581343ebeb1c4c973513682535d6 alleviate the 
issue?

-Tyrel

> 
> I'm seeing this crash trying to boot a KVM virtual machine. This kernel
> was compiled with pseries_le_defconfig and run using the following qemu
> commandline:
> 
> qemu-system-ppc64 -enable-kvm -cpu POWER8 -smp 4 -m 4G -M pseries
> -nographic -vga none -drive file=vm.raw,if=virtio,format=raw -drive
> file=mkvmconf2xeO,if=virtio,format=raw -netdev type=user,id=net0
> -device virtio-net-pci,netdev=net0 -kernel vmlinux_tscr -append
> 'root=/dev/vdb1 rw cloud-init=disabled'
> 
> qemu-system-ppc64 --version
> QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.16), Copyright
> (c) 2003-2008 Fabrice Bellard
> 
> 
> Key type dns_resolver registered
> Unable to handle kernel paging request for data at address 0x00000010
> Faulting instruction address: 0xc0000000018f2bbc
> Oops: Kernel access of bad area, sig: 11 [#1]
> LE SMP NR_CPUS=2048 NUMA pSeries
> CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.16.0-rc1v4.16-rc1 #8
> NIP:  c0000000018f2bbc LR: c0000000018f2bb4 CTR: 0000000000000000
> REGS: c0000000fea838d0 TRAP: 0380   Not tainted  (4.16.0-rc1v4.16-rc1)
> MSR:  8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 84000248  XER:
> 20000000
> CFAR: c0000000019591a0 SOFTE: 0 
> GPR00: c0000000018f2bb4 c0000000fea83b50 c000000001bd8400
> 0000000000000000 
> GPR04: c0000000fea83b70 0000000000000000 000000000000002f
> 0000000000000022 
> GPR08: 0000000000000000 c0000000022a3e90 0000000000000000
> 0000000000000220 
> GPR12: 0000000000000000 c00000000fb40980 c00000000000d698
> 0000000000000000 
> GPR16: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 
> GPR20: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 
> GPR24: 0000000000000000 c0000000018b9248 c0000000018e36d8
> c0000000019738a8 
> GPR28: 0000000000000007 c0000000fffffc68 c0000000fea83bf0
> 0000000000000010 
> NIP [c0000000018f2bbc] read_drconf_v1_cell+0x50/0x9c
> LR [c0000000018f2bb4] read_drconf_v1_cell+0x48/0x9c
> Call Trace:
> [c0000000fea83b50] [c0000000018f2bb4] read_drconf_v1_cell+0x48/0x9c
> (unreliable)
> [c0000000fea83b90] [c0000000018f305c] drmem_init+0x13c/0x2ec
> [c0000000fea83c40] [c0000000018e4288] do_one_initcall+0xdc/0x1ac
> [c0000000fea83d00] [c0000000018e45d4] kernel_init_freeable+0x27c/0x358
> [c0000000fea83dc0] [c00000000000d6bc] kernel_init+0x2c/0x160
> [c0000000fea83e30] [c00000000000bc20] ret_from_kernel_thread+0x5c/0xbc
> Instruction dump:
> 7c7f1b78 60000000 60000000 7c240b78 3d22ffdc 3929f0a4 e95e0000
> e8690002 
> f9440021 4806657d 60000000 e9210020 <f87f0000> 39090004 39490010
> f9010020 
> ---[ end trace bd9f49f482d30e03 ]---
> 
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> 
> WARNING: CPU: 1 PID: 1 at drivers/tty/vt/vt.c:3883
> do_unblank_screen+0x1f0/0x270
> CPU: 1 PID: 1 Comm: swapper/0 Tainted: G      D          4.16.0-
> rc1v4.16-rc1 #8
> NIP:  c0000000009aa800 LR: c0000000009aa63c CTR: c00000000148f5f0
> REGS: c0000000fea832c0 TRAP: 0700   Tainted:
> G      D           (4.16.0-rc1v4.16-rc1)
> MSR:  8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 28002222  XER:
> 20000000
> CFAR: c0000000009aa658 SOFTE: 1 
> GPR00: c0000000009aa63c c0000000fea83540 c000000001bd8400
> 0000000000000000 
> GPR04: 0000000000000001 c0000000fb0c200e 0000000000001dd7
> c0000000fea834d0 
> GPR08: 00000000fe430000 0000000000000000 0000000000000000
> 0000000000000001 
> GPR12: 0000000028002428 c00000000fb40980 c00000000000d698
> 0000000000000000 
> GPR16: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 
> GPR20: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000 
> GPR24: c0000000fea40000 c0000000feadf910 c000000001a4a7a8
> c000000001cc4ea0 
> GPR28: c00000000173f4f0 c000000001cc4ec8 0000000000000000
> 0000000000000000 
> NIP [c0000000009aa800] do_unblank_screen+0x1f0/0x270
> LR [c0000000009aa63c] do_unblank_screen+0x2c/0x270
> Call Trace:
> [c0000000fea83540] [c0000000009aa63c] do_unblank_screen+0x2c/0x270
> (unreliable)
> [c0000000fea835b0] [c0000000008a2a70] bust_spinlocks+0x40/0x80
> [c0000000fea835d0] [c0000000000da90c] panic+0x1b8/0x32c
> [c0000000fea83670] [c0000000000e1bd4] do_exit+0xcb4/0xcc0
> [c0000000fea83730] [c0000000000275fc] die+0x29c/0x450
> [c0000000fea837c0] [c000000000053f88] bad_page_fault+0xe8/0x160
> [c0000000fea83830] [c000000000028a90] slb_miss_bad_addr+0x40/0x90
> [c0000000fea83860] [c000000000008b08] bad_addr_slb+0x158/0x160
> --- interrupt: 380 at read_drconf_v1_cell+0x50/0x9c
>     LR = read_drconf_v1_cell+0x48/0x9c
> [c0000000fea83b90] [c0000000018f305c] drmem_init+0x13c/0x2ec
> [c0000000fea83c40] [c0000000018e4288] do_one_initcall+0xdc/0x1ac
> [c0000000fea83d00] [c0000000018e45d4] kernel_init_freeable+0x27c/0x358
> [c0000000fea83dc0] [c00000000000d6bc] kernel_init+0x2c/0x160
> [c0000000fea83e30] [c00000000000bc20] ret_from_kernel_thread+0x5c/0xbc
> Instruction dump:
> 3c62ffbf 38840001 7c8407b4 38639ca8 4b7ae0ed 60000000 38210070
> e8010010 
> ebc1fff0 ebe1fff8 7c0803a6 4e800020 <0fe00000> 4bfffe58 60000000
> 60420000 
> ---[ end trace bd9f49f482d30e04 ]---
> Rebooting in 10 seconds..
> 

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