Buildresult: powerpc-next/85xx/xes_mpc85xx_defconfig/powerpc-gcc5 built on Dec 17 2022, 05:23

kisskb

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Status:	OK
Date/Time:	Dec 17 2022, 05:23
Duration:	0:00:53.630287
Builder:	alpine3
Revision:	powerpc/code-patching: Fix oops with DEBUG_VM enabled (`980411a4d1bb925d28cd9e8d8301dc982ece788d)`
Target:	powerpc-next/85xx/xes_mpc85xx_defconfig/powerpc-gcc5
Branch:	powerpc-next
Compiler:	powerpc-gcc5 (powerpc64-linux-gcc (GCC) 5.5.0 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	85xx/xes_mpc85xx_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 980411a4d1bb925d28cd9e8d8301dc982ece788d^{commit} 980411a4d1bb925d28cd9e8d8301dc982ece788d already have revision, skipping fetch # git checkout -q -f -B kisskb 980411a4d1bb925d28cd9e8d8301dc982ece788d # git clean -qxdf # < git log -1 # commit 980411a4d1bb925d28cd9e8d8301dc982ece788d # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Fri Dec 16 12:43:12 2022 +1100 # # powerpc/code-patching: Fix oops with DEBUG_VM enabled # # Nathan reported that the new per-cpu mm patching oopses if DEBUG_VM is # enabled: # # ------------[ cut here ]------------ # kernel BUG at arch/powerpc/mm/pgtable.c:333! # Oops: Exception in kernel mode, sig: 5 [#1] # LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV # Modules linked in: # CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.1.0-rc2+ #1 # Hardware name: IBM PowerNV (emulated by qemu) POWER9 0x4e1200 opal:v7.0 PowerNV # ... # NIP assert_pte_locked+0x180/0x1a0 # LR assert_pte_locked+0x170/0x1a0 # Call Trace: # 0x60000000 (unreliable) # patch_instruction+0x618/0x6d0 # arch_prepare_kprobe+0xfc/0x2d0 # register_kprobe+0x520/0x7c0 # arch_init_kprobes+0x28/0x3c # init_kprobes+0x108/0x184 # do_one_initcall+0x60/0x2e0 # kernel_init_freeable+0x1f0/0x3e0 # kernel_init+0x34/0x1d0 # ret_from_kernel_thread+0x5c/0x64 # # It's caused by the assert_spin_locked() failing in assert_pte_locked(). # The assert fails because the PTE was unlocked in text_area_cpu_up_mm(), # and never relocked. # # The PTE page shouldn't be freed, the patching_mm is only used for # patching on this CPU, only that single PTE is ever mapped, and it's only # unmapped at CPU offline. # # In fact assert_pte_locked() has a special case to ignore init_mm # entirely, and the patching_mm is more-or-less like init_mm, so possibly # the check could be skipped for patching_mm too. # # But for now be conservative, and use the proper PTE accessors at # patching time, so that the PTE lock is held while the PTE is used. That # also avoids the warning in assert_pte_locked(). # # With that it's no longer necessary to save the PTE in # cpu_patching_context for the mm_patch_enabled() case. # # Fixes: c28c15b6d28a ("powerpc/code-patching: Use temporary mm for Radix MMU") # Reported-by: Nathan Chancellor <nathan@kernel.org> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/20221216125913.990972-1-mpe@ellerman.id.au # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 980411a4d1bb925d28cd9e8d8301dc982ece788d # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_xes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 85xx/xes_mpc85xx_defconfig # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_xes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_xes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_xes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- Completed OK # rm -rf /kisskb/build/powerpc-next_85xx_xes_mpc85xx_defconfig_powerpc-gcc5 # Build took: 0:00:53.630287

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