On Wed, 2021-04-28 at 08:08 +0200, Christophe Leroy wrote: > > Le 28/04/2021 à 00:42, Eddie James a écrit : > > On Tue, 2021-04-27 at 19:26 +0200, Christophe Leroy wrote: > > > Hi Eddies, > > > > > > Le 27/04/2021 à 19:03, Eddie James a écrit : > > > > Hi all, > > > > > > > > I'm having a problem in simulation and hardware where my PPC476 > > > > processor stops executing instructions after callling /init. In > > > > my > > > > case > > > > this is a bash script. The code descends to flush the TLB, and > > > > somewhere in the loop in _tlbil_pid, the PC goes to > > > > InstructionTLBError47x but does not go any further. This only > > > > occurs in > > > > the crash kernel environment, which is using the same kernel, > > > > initramfs, and init script as the main kernel, which executed > > > > fine. > > > > I > > > > do not see this problem with linux 4.19 or 3.10. I do see it > > > > with > > > > 5.4 > > > > and 5.10. I see a fair amount of refactoring in the PPC memory > > > > management area between 4.19 and 5.4. Can anyone point me in a > > > > direction to debug this further? My stack trace is below as I > > > > can > > > > run > > > > gdb in simulation. > > > > > > Can you bisect to pin point the culprit commit ? > > > > Hi, thanks for your prompt reply. > > > > Good idea! I have bisected to: > > > > commit 9e849f231c3c72d4c3c1b07c9cd19ae789da0420 (b8-bad, > > refs/bisect/bad) > > Author: Christophe Leroy <christophe.le...@c-s.fr> > > Date: Thu Feb 21 19:08:40 2019 +0000 > > > > powerpc/mm/32s: use generic mmu_mapin_ram() for all blocks. > > > > Now that mmu_mapin_ram() is able to handle other blocks > > than the one starting at 0, the WII can use it for all > > its blocks. > > > > Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > > Signed-off-by: Michael Ellerman <m...@ellerman.id.au> > > > > I also confirmed that reverting this commit resolves the issue in > > 5.4+. > > > > Now, I don't understand why this is problematic or what is really > > happening... Reverting is probably not the desired solution. > > > > Can you provide the 'dmesg' or a dump of the logs printed by the > kernel at boottime ? > > The difference with this commit is that if there are several > memblocks, all get mapped. Maybe your > target doesn't like it. > > You are talking about simulation, are you using QEMU ? If yes can you > provide details so that I can > try and reproduce the issue ?
Milton mentioned the kexec debug output might be useful: lzma_decompress_file: read on uImage of 65536 bytes failed kernel: 0xb75b3010 kernel_size: 0x4f1231 0000000000000000-0000000040000000 : 0 get base memory ranges:1 usable memory rgns size:1 base:0 size:10000000 exclude_range sorted exclude_range[0] start:0, end:bb7000 setup_memory_ranges memory_range[0] start:bb7001, end:30000000 CRASH MEMORY RANGES 0000000000000000-0000000000010000 0000000000010000-000000000c000000 0000000010000000-000000002d600000 get_crash_notes_per_cpu: crash_notes addr = 2ce84e00, size = 300 Elf header: p_type = 4, p_offset = 0x2ce84e00 p_paddr = 0x2ce84e00 p_vaddr = 0x0 p_filesz = 0x12c p_memsz = 0x12c vmcoreinfo header: p_type = 4, p_offset = 0x2c8d4000 p_paddr = 0x2c8d4000 p_vadd r = 0x0 p_filesz = 0x1024 p_memsz = 0x1024 Elf header: p_type = 1, p_offset = 0xcc7e000 p_paddr = 0x0 p_vaddr = 0xc0000000 p_filesz = 0x10000 p_memsz = 0x10000 Elf header: p_type = 1, p_offset = 0x10000 p_paddr = 0x10000 p_vaddr = 0xc001000 0 p_filesz = 0xbff0000 p_memsz = 0xbff0000 Elf header: p_type = 1, p_offset = 0x10000000 p_paddr = 0x10000000 p_vaddr = 0xd 0000000 p_filesz = 0x1d600000 p_memsz = 0x1d600000 Command line after adding elfcorehdr: elfcorehdr=209464K sym: .data info: 03 other: 00 shndx: 7 value: 0 size: 0 sym: .data value: ffffbf0 addr: fffc032 sym: .data info: 03 other: 00 shndx: 7 value: 0 size: 0 sym: .data value: ffffbf0 addr: fffc03a sym: sha256_starts info: 12 other: 00 shndx: 2 value: 92c size: 70 sym: sha256_starts value: fffc950 addr: fffc044 sym: sha256_update info: 12 other: 00 shndx: 2 value: 36c4 size: c sym: sha256_update value: ffff6e8 addr: fffc058 sym: sha256_finish info: 12 other: 00 shndx: 2 value: 36d0 size: 1a4 sym: sha256_finish value: ffff6f4 addr: fffc070 sym: memcmp info: 12 other: 00 shndx: 2 value: 5fc size: 38 sym: memcmp value: fffc620 addr: fffc080 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff898 addr: fffc08e sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8c8 addr: fffc092 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff898 addr: fffc096 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc09c sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8b8 addr: fffc0a2 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8b8 addr: fffc0a6 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8c8 addr: fffc0aa sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc0ac sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc0b8 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8ce addr: fffc0ca sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8ce addr: fffc0d2 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc0d8 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8d0 addr: fffc0de sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8d0 addr: fffc0e2 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc0e4 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc0f0 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc104 sym: _restgpr_28_x info: 12 other: 00 shndx: 2 value: 888 size: 0 sym: _restgpr_28_x value: fffc8ac addr: fffc110 sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8e0 addr: fffc11a sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8e0 addr: fffc122 sym: printf info: 12 other: 00 shndx: 2 value: 524 size: 68 sym: printf value: fffc548 addr: fffc128 sym: setup_arch info: 12 other: 00 shndx: 2 value: 91c size: 4 sym: setup_arch value: fffc940 addr: fffc12c sym: skip_checks info: 11 other: 00 shndx: 8 value: 0 size: 4 sym: skip_checks value: ffffd50 addr: fffc132 sym: skip_checks info: 11 other: 00 shndx: 8 value: 0 size: 4 sym: skip_checks value: ffffd50 addr: fffc136 sym: verify_sha256_digest info: 12 other: 00 shndx: 2 value: 0 size: f0 sym: verify_sha256_digest value: fffc024 addr: fffc140 sym: post_verification_setup_arch info: 12 other: 00 shndx: 2 value: 920 size: 4 sym: post_verification_setup_arch value: fffc944 addr: fffc15c sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8f2 addr: fffc16e sym: .rodata.str1.1 info: 03 other: 00 shndx: 4 value: 0 size: 0 sym: .rodata.str1.1 value: ffff8f2 addr: fffc18a sym: _restgpr_20_x info: 12 other: 00 shndx: 2 value: 868 size: 0 sym: _restgpr_20_x value: fffc88c addr: fffc1a8 sym: putchar info: 12 other: 00 shndx: 2 value: 928 size: 4 sym: putchar value: fffc94c addr: fffc1cc sym: putchar info: 12 other: 00 shndx: 2 value: 928 size: 4 sym: putchar value: fffc94c addr: fffc244 sym: __lshrdi3 info: 10 other: 00 shndx: 2 value: 8f8 size: 0 sym: __lshrdi3 value: fffc91c addr: fffc2c4 sym: putchar info: 12 other: 00 shndx: 2 value: 928 size: 4 sym: putchar value: fffc94c addr: fffc4e4 sym: vsprintf info: 12 other: 00 shndx: 2 value: 13c size: 38c sym: vsprintf value: fffc160 addr: fffc534 sym: vsprintf info: 12 other: 00 shndx: 2 value: 13c size: 38c sym: vsprintf value: fffc160 addr: fffc59c sym: my_thread_ptr info: 11 other: 00 shndx: 8 value: 8 size: 4 sym: my_thread_ptr value: ffffd58 addr: fffc76a sym: my_thread_ptr info: 11 other: 00 shndx: 8 value: 8 size: 4 sym: my_thread_ptr value: ffffd58 addr: fffc76e sym: stack info: 11 other: 00 shndx: 8 value: 10 size: 4 sym: stack value: ffffd60 addr: fffc776 sym: stack info: 11 other: 00 shndx: 8 value: 10 size: 4 sym: stack value: ffffd60 addr: fffc77a sym: purgatory info: 12 other: 00 shndx: 2 value: f0 size: 4c sym: purgatory value: fffc114 addr: fffc784 sym: dt_offset info: 11 other: 00 shndx: 8 value: c size: 4 sym: dt_offset value: ffffd5c addr: fffc79e sym: dt_offset info: 11 other: 00 shndx: 8 value: c size: 4 sym: dt_offset value: ffffd5c addr: fffc7a2 sym: kernel info: 11 other: 00 shndx: 8 value: 4 size: 4 sym: kernel value: ffffd54 addr: fffc7ba sym: kernel info: 11 other: 00 shndx: 8 value: 4 size: 4 sym: kernel value: ffffd54 addr: fffc7be sym: memcpy info: 12 other: 00 shndx: 2 value: 5d8 size: 24 sym: memcpy value: fffc5fc addr: ffff648 sym: memcpy info: 12 other: 00 shndx: 2 value: 5d8 size: 24 sym: memcpy value: fffc5fc addr: ffff65c sym: sha256_process info: 12 other: 00 shndx: 2 value: 99c size: 2be0 sym: sha256_process value: fffc9c0 addr: ffff66c sym: sha256_process info: 12 other: 00 shndx: 2 value: 99c size: 2be0 sym: sha256_process value: fffc9c0 addr: ffff6a8 sym: .data info: 03 other: 00 shndx: 7 value: 0 size: 0 sym: .data value: ffffd10 addr: ffff742 sym: .data info: 03 other: 00 shndx: 7 value: 0 size: 0 sym: .data value: ffffd10 addr: ffff74a sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc024 addr: ffff920 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc114 addr: ffff94c sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc160 addr: ffff980 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc4ec addr: ffff9c8 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc548 addr: ffff9e8 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc5b0 addr: ffffa1c sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc5dc addr: ffffa30 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc5fc addr: ffffa44 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc620 addr: ffffa58 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc940 addr: ffffa80 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc944 addr: ffffa94 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc948 addr: ffffaa8 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc94c addr: ffffad0 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc950 addr: ffffaf8 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: fffc9c0 addr: ffffb0c sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: ffff5a0 addr: ffffb68 sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: ffff6e8 addr: ffffbbc sym: .text info: 03 other: 00 shndx: 2 value: 0 size: 0 sym: .text value: ffff6f4 addr: ffffbd0 Modified cmdline:console=ttyS0,115200 loglevel=9 rootwait root=/dev/mmcblk0p2 el fcorehdr=209464K maxcpus=1 reserve regions: 4 0: offset: e3fc000, size: 4000 1: offset: c000000, size: c8f000 2: offset: fffc000, size: 4000 3: offset: f6a7000, size: 955000 debug.dtb written kexec_load: entry = 0xfffc658 flags = 0x1 nr_segments = 6 segment[0].buf = 0xb5cb1010 segment[0].bufsz = 0xb7d568 segment[0].mem = 0xc000000 segment[0].memsz = 0xc7e000 segment[1].buf = 0x100997b0 segment[1].bufsz = 0x10000 segment[1].mem = 0xcc7e000 segment[1].memsz = 0x10000 segment[2].buf = 0x100a97f0 segment[2].bufsz = 0x400 segment[2].mem = 0xcc8e000 segment[2].memsz = 0x1000 segment[3].buf = 0x100ae670 segment[3].bufsz = 0x3c5f segment[3].mem = 0xe3fc000 segment[3].memsz = 0x4000 segment[4].buf = 0xb6c5e050 segment[4].bufsz = 0x95409f segment[4].mem = 0xf6a7000 segment[4].memsz = 0x955000 segment[5].buf = 0x100aa8a0 segment[5].bufsz = 0x3d6c segment[5].mem = 0xfffc000 segment[5].memsz = 0x4000 > > Thanks > Christophe
