On Wed, Nov 11, 2020 at 9:15 AM Ard Biesheuvel <ardb@xxxxxxxxxx> wrote: > > On Wed, 11 Nov 2020 at 07:13, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote: > > > > The following kernel warning noticed on arm KASAN enabled config while booting. > > > > [ 0.000000] Linux version 5.10.0-rc3-next-20201110 > > (tuxmake@e15fe3b4fdc6) (arm-linux-gnueabihf-gcc (Debian 9.3.0-13) > > 9.3.0, GNU ld (GNU Binutils for Debian) 2.35.1) #2 SMP Tue Nov 10 > > 07:49:47 UTC 2020 > > [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d > > <trim> > > [ 0.000000] kasan: Truncating shadow for memory block at > > 0x40000000-0xffffffff to lowmem region at 0x70000000 > > [ 0.000000] kasan: Mapping kernel virtual memory block: > > c0000000-f0000000 at shadow: b7000000-bd000000 > > [ 0.000000] kasan: Mapping kernel virtual memory block: > > bf000000-c0000000 at shadow: b6e00000-b7000000 > > [ 0.000000] kasan: Kernel address sanitizer initialized > > <trim> > > [ 0.000000] ftrace: allocating 57178 entries in 112 pages > > [ 0.000000] ------------[ cut here ]------------ > > [ 0.000000] WARNING: CPU: 0 PID: 0 at arch/arm/kernel/insn.c:47 > > __arm_gen_branch+0x78/0x80 > > [ 0.000000] Modules linked in: > > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted > > 5.10.0-rc3-next-20201110 #2 > > [ 0.000000] Hardware name: Generic DT based system > > [ 0.000000] Backtrace: > > [ 0.000000] [<c199f710>] (dump_backtrace) from [<c199fb94>] > > (show_stack+0x20/0x24) > > [ 0.000000] r9:00000080 r8:c2e00000 r7:c3023060 r6:600000d3 > > r5:00000000 r4:c3023060 > > [ 0.000000] [<c199fb74>] (show_stack) from [<c19a7ad0>] > > (dump_stack+0xe8/0x10c) > > [ 0.000000] [<c19a79e8>] (dump_stack) from [<c0366518>] (__warn+0x140/0x164) > > [ 0.000000] r10:00000009 r9:00000000 r8:c2e0e000 r7:00000009 > > r6:c031986c r5:0000002f > > [ 0.000000] r4:c1a0bbe0 r3:c2e06f50 > > [ 0.000000] [<c03663d8>] (__warn) from [<c19a13ac>] > > (warn_slowpath_fmt+0xc0/0x128) > > [ 0.000000] r9:c031986c r8:0000002f r7:c1a0bbe0 r6:00000000 > > r5:c2e03ec0 r4:b75c07cc > > [ 0.000000] [<c19a12f0>] (warn_slowpath_fmt) from [<c031986c>] > > (__arm_gen_branch+0x78/0x80) > > [ 0.000000] r10:0000d247 r9:c4019238 r8:c400c104 r7:c2e070a0 > > r6:c400c108 r5:c0319250 > > [ 0.000000] r4:00000000 > > [ 0.000000] [<c03197f4>] (__arm_gen_branch) from [<c0319720>] > > (ftrace_make_nop+0x30/0x48) > > [ 0.000000] r5:c0319250 r4:c2b00354 > > [ 0.000000] [<c03196f0>] (ftrace_make_nop) from [<c04ac104>] > > (ftrace_process_locs+0x470/0x5f0) > > [ 0.000000] r5:00001248 r4:c400c100 > > [ 0.000000] [<c04abc94>] (ftrace_process_locs) from [<c2b2d8f4>] > > (ftrace_init+0xa8/0x158) > > [ 0.000000] r10:10c5387d r9:c1a87768 r8:c2cb9f98 r7:c2c82230 > > r6:00000001 r5:c2e070a0 > > [ 0.000000] r4:c37f5c40 > > [ 0.000000] [<c2b2d84c>] (ftrace_init) from [<c2b010ec>] > > (start_kernel+0x174/0x3f8) > > [ 0.000000] r9:00000001 r8:c2e06f00 r7:00000000 r6:c2e06f00 > > r5:c37c0000 r4:ffffffff > > [ 0.000000] [<c2b00f78>] (start_kernel) from [<00000000>] (0x0) > > [ 0.000000] r9:410fd034 r8:48000000 r7:ffffffff r6:10c0387d > > r5:00000051 r4:c2b00334 > > [ 0.000000] random: get_random_bytes called from > > print_oops_end_marker+0x30/0xa0 with crng_init=0 > > [ 0.000000] ---[ end trace 0000000000000000 ]--- > > [ # > > 0.000000] ------------[ ftrace bug ]------------ > > [ 0.000000] ftrace failed to modify > > [ 0.000000] [<c2b00354>] set_reset_devices+0x10/0x28 > > [ 0.000000] actual: 0a:3d:04:eb > > [ 0.000000] Initializing ftrace call sites > > [ 0.000000] ftrace record flags: 0 > > [ 0.000000] (0) > > [ 0.000000] expected tramp: c031925c > > [ 0.000000] ------------[ cut here ]------------ > > [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:2065 > > ftrace_bug+0x218/0x280 > > [ 0.000000] Modules linked in: > > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G W > > 5.10.0-rc3-next-20201110 #2 > > [ 0.000000] Hardware name: Generic DT based system > > [ 0.000000] Backtrace: > > [ 0.000000] [<c199f710>] (dump_backtrace) from [<c199fb94>] > > (show_stack+0x20/0x24) > > [ 0.000000] r9:00000080 r8:c2e00000 r7:c3023060 r6:600000d3 > > r5:00000000 r4:c3023060 > > [ 0.000000] [<c199fb74>] (show_stack) from [<c19a7ad0>] > > (dump_stack+0xe8/0x10c) > > [ 0.000000] [<c19a79e8>] (dump_stack) from [<c0366518>] (__warn+0x140/0x164) > > [ 0.000000] r10:00000009 r9:00000000 r8:c2e0e000 r7:00000009 > > r6:c19a3790 r5:00000811 > > [ 0.000000] r4:c1a863c0 r3:c2e06f50 > > [ 0.000000] [<c03663d8>] (__warn) from [<c19a13ac>] > > (warn_slowpath_fmt+0xc0/0x128) > > [ 0.000000] r9:c19a3790 r8:00000811 r7:c1a863c0 r6:00000000 > > r5:c2e03ee0 r4:b75c07d0 > > [ 0.000000] [<c19a12f0>] (warn_slowpath_fmt) from [<c19a3790>] > > (ftrace_bug+0x218/0x280) > > [ 0.000000] r10:0000d247 r9:c4019238 r8:c400c104 r7:c37f5c40 > > r6:c1a86960 r5:c401923c > > [ 0.000000] r4:c4019238 > > [ 0.000000] [<c19a3578>] (ftrace_bug) from [<c04abfc0>] > > (ftrace_process_locs+0x32c/0x5f0) > > [ 0.000000] r7:c2e070a0 r6:c400c108 r5:00001248 r4:c400c100 > > [ 0.000000] [<c04abc94>] (ftrace_process_locs) from [<c2b2d8f4>] > > (ftrace_init+0xa8/0x158) > > [ 0.000000] r10:10c5387d r9:c1a87768 r8:c2cb9f98 r7:c2c82230 > > r6:00000001 r5:c2e070a0 > > [ 0.000000] r4:c37f5c40 > > [ 0.000000] [<c2b2d84c>] (ftrace_init) from [<c2b010ec>] > > (start_kernel+0x174/0x3f8) > > [ 0.000000] r9:00000001 r8:c2e06f00 r7:00000000 r6:c2e06f00 > > r5:c37c0000 r4:ffffffff > > [ 0.000000] [<c2b00f78>] (start_kernel) from [<00000000>] (0x0) > > [ 0.000000] r9:410fd034 r8:48000000 r7:ffffffff r6:10c0387d > > r5:00000051 r4:c2b00334 > > [ 0.000000] ---[ end trace f68728a0d3053b52 ]--- > > [ 0.000000] ftrace: allocated 112 pages with 3 groups > > > > metadata: > > git branch: master > > git repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next > > git describe: next-20201110 > > make_kernelversion: 5.10.0-rc3 > > build : https://builds.tuxbuild.com/1k5bYasxkHF7omMh7mjtxjRtkMe/ > > > > The qemu boot command, > > ----------------------------------- > > /usr/bin/qemu-system-aarch64 -cpu host,aarch64=off -machine > > virt-2.10,accel=kvm -nographic -net > > nic,model=virtio,macaddr=BA:DD:AD:CC:09:03 -net tap -m 2048 -monitor > > none -kernel kernel/zImage --append "console=ttyAMA0 root=/dev/vda rw" > > -hda rpb-console-image-lkft-am57xx-evm-20201022181203-3085.rootfs.ext4 > > -m 4096 -smp 2 -nographic > > > > Full log: > > https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20201110/testrun/3420437/suite/linux-log-parser/test/check-kernel-warning-1927841/log > > > > The kernel you are building is too big. > > An ordinary multi_v7_defconfig+thumb2 has > > (10240K kernel code, 2232K rwdata, 5344K rodata, 2048K init, 441K bss, > 144040K reserved, 65536K cma-reserved, 3340512K highmem) > > whereas your kernel has > > (23552K kernel code, 9970K rwdata, 16736K rodata, 3072K init, 4849K > bss, 189072K reserved, 65536K cma-reserved, 2293756K highmem) > > and so the kernel text section is too large to resolve relative branches. > > Which config are you building? The config available from the 'build' link above: https://builds.tuxbuild.com/1k5bYasxkHF7omMh7mjtxjRtkMe/config This is a diff of that against multi_v7_defconfig: https://pastebin.com/v2uxkrCe I ran that on v5.10-rc1, so it's missing KASAN. I don't think any of the individual drivers is going to be a huge difference, but these are the ones that might add a percentage to the overall build: CONFIG_NAMESPACES CONFIG_KALLSYMS_ALL CONFIG_KPROBES CONFIG_KSM CONFIG_VIDEO_V4L2 CONFIG_FUNCTION_TRACER CONFIG_DYNAMIC_FTRACE CONFIG_IRQSOFF_TRACER CONFIG_KPROBE_EVENTS CONFIG_FTRACE_MCOUNT_RECORD CONFIG_UNWINDER_FRAME_POINTER CONFIG_KASAN My guess is that the combination of a few of the above doubles the size. Arnd
