Re: [mm/khugepaged] 0d006aeaf9: BUG:unable_to_handle_page_fault_for_address
From: Zach O'Keefe
Date: Wed May 04 2022 - 17:47:04 EST
Thanks for reporting. Fixed in v5.
On Tue, May 3, 2022 at 7:25 PM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
>
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: 0d006aeaf99be94a0dcb727cb6540195f13fd9c3 ("[PATCH v4 04/13] mm/khugepaged: make hugepage allocation context-specific")
> url: https://github.com/intel-lab-lkp/linux/commits/Zach-O-Keefe/mm-khugepaged-record-SCAN_PMD_MAPPED-when-scan_pmd-finds-THP/20220503-031727
> patch link: https://lore.kernel.org/linux-mm/20220502181714.3483177-5-zokeefe@xxxxxxxxxx
>
> in testcase: boot
>
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
>
>
> [ 18.854835][ T17] BUG: unable to handle page fault for address: 003c24ca
> [ 18.855169][ T17] #PF: supervisor read access in kernel mode
> [ 18.855395][ T17] #PF: error_code(0x0000) - not-present page
> [ 18.855620][ T17] *pde = 00000000
> [ 18.855763][ T17] Oops: 0000 [#1]
> [ 18.855903][ T17] CPU: 0 PID: 17 Comm: khugepaged Not tainted 5.18.0-rc5-next-20220502-00004-g0d006aeaf99b #1
> [ 18.856283][ T17] EIP: alloc_charge_hpage (mm/khugepaged.c:951 mm/khugepaged.c:1091)
> [ 18.856498][ T17] Code: 00 00 00 55 89 e5 6a 07 e8 86 c0 ff ff c9 31 d2 89 d1 c3 55 89 e5 a1 28 e6 fa 59 25 80 00 00 00 83 f8 01 19 c0 25 00 fc ff ff <8b> 80 ca 24 3c 00 85 c0 74 0f 8b 42 08 5d 8b 40 04 b8 01 00 00 00
> All code
> ========
> 0: 00 00 add %al,(%rax)
> 2: 00 55 89 add %dl,-0x77(%rbp)
> 5: e5 6a in $0x6a,%eax
> 7: 07 (bad)
> 8: e8 86 c0 ff ff callq 0xffffffffffffc093
> d: c9 leaveq
> e: 31 d2 xor %edx,%edx
> 10: 89 d1 mov %edx,%ecx
> 12: c3 retq
> 13: 55 push %rbp
> 14: 89 e5 mov %esp,%ebp
> 16: a1 28 e6 fa 59 25 80 movabs 0x802559fae628,%eax
> 1d: 00 00
> 1f: 00 83 f8 01 19 c0 add %al,-0x3fe6fe08(%rbx)
> 25: 25 00 fc ff ff and $0xfffffc00,%eax
> 2a:* 8b 80 ca 24 3c 00 mov 0x3c24ca(%rax),%eax <-- trapping instruction
> 30: 85 c0 test %eax,%eax
> 32: 74 0f je 0x43
> 34: 8b 42 08 mov 0x8(%rdx),%eax
> 37: 5d pop %rbp
> 38: 8b 40 04 mov 0x4(%rax),%eax
> 3b: b8 01 00 00 00 mov $0x1,%eax
>
> Code starting with the faulting instruction
> ===========================================
> 0: 8b 80 ca 24 3c 00 mov 0x3c24ca(%rax),%eax
> 6: 85 c0 test %eax,%eax
> 8: 74 0f je 0x19
> a: 8b 42 08 mov 0x8(%rdx),%eax
> d: 5d pop %rbp
> e: 8b 40 04 mov 0x4(%rax),%eax
> 11: b8 01 00 00 00 mov $0x1,%eax
> [ 18.857217][ T17] EAX: 00000000 EBX: 41172400 ECX: 00000000 EDX: 411d1f7c
> [ 18.857487][ T17] ESI: 411d1f7c EDI: 4117245c EBP: 411d1e64 ESP: 411d1e64
> [ 18.857750][ T17] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
> [ 18.858036][ T17] CR0: 80050033 CR2: 003c24ca CR3: 112f3000 CR4: 000406d0
> [ 18.858302][ T17] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 18.858567][ T17] DR6: fffe0ff0 DR7: 00000400
> [ 18.858743][ T17] Call Trace:
> [ 18.858871][ T17] ? collapse_huge_page (mm/khugepaged.c:1109)
> [ 18.859066][ T17] ? find_held_lock (kernel/locking/lockdep.c:5156)
> [ 18.859245][ T17] ? khugepaged_scan_pmd (mm/khugepaged.c:1400)
> [ 18.859446][ T17] ? khugepaged_scan_mm_slot (mm/khugepaged.c:2216)
> [ 18.859657][ T17] ? khugepaged_do_scan (mm/khugepaged.c:2290)
> [ 18.859854][ T17] ? khugepaged (mm/khugepaged.c:2340)
> [ 18.860016][ T17] ? khugepaged_defrag_show (mm/khugepaged.c:1076)
> [ 18.860219][ T17] ? kthread (kernel/kthread.c:376)
> [ 18.860374][ T17] ? khugepaged_do_scan (mm/khugepaged.c:2328)
> [ 18.860570][ T17] ? kthread_complete_and_exit (kernel/kthread.c:331)
> [ 18.860781][ T17] ? ret_from_fork (arch/x86/entry/entry_32.S:772)
> [ 18.860956][ T17] Modules linked in:
> [ 18.861105][ T17] CR2: 00000000003c24ca
> [ 18.861262][ T17] ---[ end trace 0000000000000000 ]---
> [ 18.861263][ T17] EIP: alloc_charge_hpage (mm/khugepaged.c:951 mm/khugepaged.c:1091)
> [ 18.861266][ T17] Code: 00 00 00 55 89 e5 6a 07 e8 86 c0 ff ff c9 31 d2 89 d1 c3 55 89 e5 a1 28 e6 fa 59 25 80 00 00 00 83 f8 01 19 c0 25 00 fc ff ff <8b> 80 ca 24 3c 00 85 c0 74 0f 8b 42 08 5d 8b 40 04 b8 01 00 00 00
> All code
> ========
> 0: 00 00 add %al,(%rax)
> 2: 00 55 89 add %dl,-0x77(%rbp)
> 5: e5 6a in $0x6a,%eax
> 7: 07 (bad)
> 8: e8 86 c0 ff ff callq 0xffffffffffffc093
> d: c9 leaveq
> e: 31 d2 xor %edx,%edx
> 10: 89 d1 mov %edx,%ecx
> 12: c3 retq
> 13: 55 push %rbp
> 14: 89 e5 mov %esp,%ebp
> 16: a1 28 e6 fa 59 25 80 movabs 0x802559fae628,%eax
> 1d: 00 00
> 1f: 00 83 f8 01 19 c0 add %al,-0x3fe6fe08(%rbx)
> 25: 25 00 fc ff ff and $0xfffffc00,%eax
> 2a:* 8b 80 ca 24 3c 00 mov 0x3c24ca(%rax),%eax <-- trapping instruction
> 30: 85 c0 test %eax,%eax
> 32: 74 0f je 0x43
> 34: 8b 42 08 mov 0x8(%rdx),%eax
> 37: 5d pop %rbp
> 38: 8b 40 04 mov 0x4(%rax),%eax
> 3b: b8 01 00 00 00 mov $0x1,%eax
>
> Code starting with the faulting instruction
> ===========================================
> 0: 8b 80 ca 24 3c 00 mov 0x3c24ca(%rax),%eax
> 6: 85 c0 test %eax,%eax
> 8: 74 0f je 0x19
> a: 8b 42 08 mov 0x8(%rdx),%eax
> d: 5d pop %rbp
> e: 8b 40 04 mov 0x4(%rax),%eax
> 11: b8 01 00 00 00 mov $0x1,%eax
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.18.0-rc5-next-20220502-00004-g0d006aeaf99b .config
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
>
> # if come across any failure that blocks the test,
> # please remove ~/.lkp and /lkp dir to run from a clean state.
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>
>