Messages in this thread | | | Subject | Re: [LKP] Re: db57e98d87 ("mm/sparse.c: fix ALIGN() without power of 2 in .."): BUG: kernel reboot-without-warning in early-boot stage, last printk: early console in setup code | From | Rong Chen <> | Date | Fri, 17 Jul 2020 16:07:20 +0800 |
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On 7/17/20 6:06 AM, Andrew Morton wrote: > On Thu, 16 Jul 2020 16:32:00 +0800 kernel test robot <lkp@intel.com> wrote: > >> Greetings, >> >> 0day kernel testing robot got the below dmesg and the first bad commit is >> >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master >> >> commit db57e98d87908b8837352abe08515e42752270c1 >> Author: Lecopzer Chen <lecopzer.chen@mediatek.com> >> AuthorDate: Mon Sep 23 15:36:24 2019 -0700 >> Commit: Linus Torvalds <torvalds@linux-foundation.org> >> CommitDate: Tue Sep 24 15:54:09 2019 -0700 >> >> mm/sparse.c: fix ALIGN() without power of 2 in sparse_buffer_alloc() > Are we sure about this? That patch is a year old - has something > in the test setup changed to make it visible at this late stage?
Hi Andrew,
The issue can be reproduced if CONFIG_SPARSEMEM_VMEMMAP is not set $ grep CONFIG_SPARSEMEM .config CONFIG_SPARSEMEM_MANUAL=y CONFIG_SPARSEMEM=y CONFIG_SPARSEMEM_EXTREME=y CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y # CONFIG_SPARSEMEM_VMEMMAP is not set
$ ./reproduce-yocto-vm-yocto-23:20200619042212:x86_64-randconfig-r025-20200618:5.3.0-11836-gdb57e98d87908:1 vmlinuz-5.3.0-11836-gdb57e98d87908 early console in setup code
and kernel can boot if enable CONFIG_SPARSEMEM_VMEMMAP $ grep CONFIG_SPARSEMEM .config CONFIG_SPARSEMEM_MANUAL=y CONFIG_SPARSEMEM=y CONFIG_SPARSEMEM_EXTREME=y CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y CONFIG_SPARSEMEM_VMEMMAP=y
$ ./reproduce-yocto-vm-yocto-23:20200619042212:x86_64-randconfig-r025-20200618:5.3.0-11836-gdb57e98d87908:1 vmlinuz-5.3.0-11836-gdb57e98d87908.CONFIG_SPARSEMEM_VMEMMAP | head early console in setup code [ 0.000000] Linux version 5.3.0-11836-gdb57e98d87908 (kbuild@6c2adaf8a115) (clang version 12.0.0 (git://gitmirror/llvm_project ed6b578040a85977026c93bf4188f996148f3218)) #1 SMP Fri Jul 17 15:41:47 CST 2020 [ 0.000000] Command line: root=/dev/ram0 hung_task_panic=1 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 watchdog_thresh=60 [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable qemu-system-x86_64: terminating on signal 2
Best Regards, Rong Chen
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