Messages in this thread | | | Subject | Re: [kmemleak] b751c52bb5: BUG:kernel_hang_in_boot_stage | From | Rong Chen <> | Date | Tue, 16 Jun 2020 10:50:05 +0800 |
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On 6/10/20 6:56 PM, Catalin Marinas wrote: > On Wed, Jun 10, 2020 at 03:51:56PM +0800, kernel test robot wrote: >> FYI, we noticed the following commit (built with gcc-7): >> >> commit: b751c52bb587ae66f773b15204ef7a147467f4c7 ("kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K") >> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >> >> in testcase: boot >> >> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G > [...] >> BUG: kernel hang in boot stage >> >> To reproduce: >> >> # build kernel >> cd linux >> cp config-5.3.0-11789-gb751c52bb587a .config >> make HOSTCC=gcc-7 CC=gcc-7 ARCH=i386 olddefconfig prepare modules_prepare bzImage > I've never tried kmemleak on i386. > > Anyway, I'm not sure what caused the hang (or whether it's a hang at > all) but I suspect prior to the above commit, kmemleak probably just > disabled itself (early log buffer exceeded). So the bug may have been > there already, only that kmemleak started working and tripped over it > when the log buffer increased.
Hi,
Sorry for the late, I can reproduce the problem with command "bin/lkp qemu -k <bzImage> job-script", and the kernel hangs:
[ 0.333897] ----------------------------------------------------- [ 0.334561] |block | try |context| [ 0.335170] ----------------------------------------------------- [ 0.335760] context: ok | ok | ok | [ 0.337995] try: ok | ok | ok | [ 0.340089] block: ok | ok | ok | [ 0.342175] spinlock: ok | ok | ok | [ 0.344481] ------------------------------------------------------- [ 0.345068] Good, all 261 testcases passed! | [ 0.345514] --------------------------------- KVM internal error. Suberror: 3 extra data[0]: 80000b0e extra data[1]: 31 extra data[2]: 182 extra data[3]: bfff0 EAX=00000000 EBX=00200297 ECX=00000000 EDX=ffffffff ESI=d2e997c0 EDI=d2e997f0 EBP=d2bbb038 ESP=c00bfff4 EIP=f4dccd57 EFL=00210046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =007b 00000000 ffffffff 00c0f300 DPL=3 DS [-WA] CS =0060 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA] SS =0068 00000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =007b 00000000 ffffffff 00c0f300 DPL=3 DS [-WA] FS =00d8 23331000 ffffffff 00809300 DPL=0 DS16 [-WA] GS =00e0 f6422900 00000018 00409100 DPL=0 DS [--A] LDT=0000 00000000 ffffffff 00c00000 TR =0080 ff403000 0000206b 00008b00 DPL=0 TSS32-busy GDT= ff401000 000000ff IDT= ff400000 000007ff CR0=80050033 CR2=00000000 CR3=130fc000 CR4=00000690 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000fffe0ff0 DR7=0000000000000400 EFER=0000000000000000 Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > Is there a chance that the kernel got much slower with kmemleak enabled > and the test scripts timed out? no, the parent commit log is:
[ 0.313845] ----------------------------------------------------- [ 0.314608] |block | try |context| [ 0.315314] ----------------------------------------------------- [ 0.315974] context: ok | ok | ok | [ 0.318261] try: ok | ok | ok | [ 0.320478] block: ok | ok | ok | [ 0.322562] spinlock: ok | ok | ok | [ 0.324825] ------------------------------------------------------- [ 0.325403] Good, all 261 testcases passed! | [ 0.325809] --------------------------------- [ 0.326221] kmemleak: Early log buffer exceeded (401), please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE [ 0.327065] ACPI: Core revision 20190816 [ 0.327585] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns [ 0.328545] APIC: Switch to symmetric I/O mode setup [ 0.329009] Enabling APIC mode: Flat. Using 1 I/O APICs [ 0.329572] masked ExtINT on CPU#0 [ 0.330686] ENABLING IO-APIC IRQs [ 0.331001] init IO_APIC IRQs [ 0.331274] apic 0 pin 0 not connected
> > Does this problem still exist with the latest mainline? yes, still in v5.7.
Best Regards, Rong Chen
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