Buildresult: powerpc-fixes/85xx/mpc8540_ads_defconfig/powerpc-gcc4.9 built on Jul 24 2020, 01:53

kisskb

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Status:	OK
Date/Time:	Jul 24 2020, 01:53
Duration:	0:00:41.491580
Builder:	ka2
Revision:	powerpc/64s: Fix irq tracing corruption in interrupt/syscall return caused by perf interrupts (`590ce02bd148cd35721560c140e3759e39a6e56a)`
Target:	powerpc-fixes/85xx/mpc8540_ads_defconfig/powerpc-gcc4.9
Branch:	powerpc-fixes
Compiler:	powerpc-gcc4.9 (powerpc64-linux-gcc (GCC) 4.9.4 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	85xx/mpc8540_ads_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 590ce02bd148cd35721560c140e3759e39a6e56a^{commit} 590ce02bd148cd35721560c140e3759e39a6e56a already have revision, skipping fetch # git checkout -q -f -B kisskb 590ce02bd148cd35721560c140e3759e39a6e56a # git clean -qxdf # < git log -1 # commit 590ce02bd148cd35721560c140e3759e39a6e56a # Author: Nicholas Piggin <npiggin@gmail.com> # Date: Wed Jul 22 17:34:37 2020 +1000 # # powerpc/64s: Fix irq tracing corruption in interrupt/syscall return caused by perf interrupts # # Alexey reports lockdep_assert_irqs_enabled() warnings when stress # testing perf, e.g., # # WARNING: CPU: 0 PID: 1556 at kernel/softirq.c:169 __local_bh_enable_ip+0x258/0x270 # CPU: 0 PID: 1556 Comm: syz-executor # NIP: c0000000001ec888 LR: c0000000001ec884 CTR: c000000000ef0610 # REGS: c000000022d4f8a0 TRAP: 0700 Not tainted (5.8.0-rc3-x) # MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 28008844 XER: 20040000 # CFAR: c0000000001dc1d0 IRQMASK: 0 # # The interesting thing is MSR[EE] and IRQMASK shows interrupts are # enabled, suggesting the current->hardirqs_enabled irq tracing state is # going out of sync with the actual interrupt enable state. # # The cause is a window in interrupt/syscall return where irq tracing # state is being adjusted for an irqs-enabled return while MSR[EE] is # still enabled. A perf interrupt hits and ends up calling # trace_hardirqs_off() when restoring interrupt flags to a disable # state. # # Fix this by disabling perf interrupts as well while adjusting irq # tracing state. # # Add a debug check that catches the condition sooner. # # Fixes: 68b34588e202 ("powerpc/64/sycall: Implement syscall entry/exit logic in C") # Cc: stable@vger.kernel.org # v5.7+ # Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru> # Signed-off-by: Nicholas Piggin <npiggin@gmail.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/20200722073437.930521-1-npiggin@gmail.com # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 590ce02bd148cd35721560c140e3759e39a6e56a # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- 85xx/mpc8540_ads_defconfig # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- INFO: Uncompressed kernel (size 0x4e6ddc) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) INFO: Uncompressed kernel (size 0x4d674c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) Image Name: Linux-5.8.0-rc2-31866-g590ce02bd Created: Fri Jul 24 01:54:00 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2544333 Bytes = 2484.70 KiB = 2.43 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.8.0-rc2-31866-g590ce02bd Created: Fri Jul 24 01:54:00 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2575266 Bytes = 2514.91 KiB = 2.46 MiB Load Address: 00500000 Entry Point: 005002a4 Completed OK # rm -rf /kisskb/build/powerpc-fixes_85xx_mpc8540_ads_defconfig_powerpc-gcc4.9 # Build took: 0:00:41.491580

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