On 7/23/24 9:05 AM, kernel test robot wrote:
>
> hi, Alex Shi,
>
> we noticed there is a mmunstable3 branch now, but there is no same title patch
> there. not sure if this report is still useful, below report just FYI.
Hi Oliver,
Thanks a lot for your testing and founding on my unreleased code branch!
The problem should be resolved on my latest code yesterday.
But multiple archs maybe still are fragile in the branch. Are there bootable in virtual machine, like arm, s390, etc?
Thanks again for your great work!
Alex
>
>
>
> Hello,
>
> kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:
>
> commit: 934c05f8c50fed91942a8aa9db46a0feae38594c ("use ptdesc in free_pte_range and pte_free_tlb series functions")
> https://github.com/alexshi/linux.git mmunstable2
>
> in testcase: boot
>
> compiler: gcc-11
> test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
> +---------------------------------------------+------------+------------+
> | | 5977eb9785 | 934c05f8c5 |
> +---------------------------------------------+------------+------------+
> | BUG:unable_to_handle_page_fault_for_address | 0 | 6 |
> | EIP:clear_user | 0 | 6 |
> +---------------------------------------------+------------+------------+
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202407221607.49138a71-oliver.sang@xxxxxxxxx
>
>
> [ 3.645340][ T1] BUG: unable to handle page fault for address: 00100016
> [ 3.645713][ T1] #PF: supervisor read access in kernel mode
> [ 3.646020][ T1] #PF: error_code(0x0000) - not-present page
> [ 3.646326][ T1] *pdpt = 000000002e992001 *pde = 0000000000000000
> [ 3.646663][ T1] Oops: Oops: 0000 [#1] PREEMPT SMP
> [ 3.646933][ T1] CPU: 0 PID: 1 Comm: init Not tainted 6.10.0-rc6-00481-g934c05f8c50f #1 c5190225c17d1f7c5bcc60b13088ed2c9e32ac25
> [ 3.647536][ T1] EIP: __lock_acquire (kernel/locking/lockdep.c:5006 (discriminator 1))
> [ 3.647797][ T1] Code: 8b 75 d0 e8 d8 9b 3c 00 85 c0 0f 85 a0 01 00 00 31 db 83 c4 38 89 d8 5b 5e 5f 5d 31 d2 31 c9 e9 60 6d be 01 8d 74 26 00 31 c0 <81> 3b a0 cb 44 c4 0f 45 45 0c 83 fa 01 89 45 f0 0f 87 10 fb ff ff
> All code
> ========
> 0: 8b 75 d0 mov -0x30(%rbp),%esi
> 3: e8 d8 9b 3c 00 call 0x3c9be0
> 8: 85 c0 test %eax,%eax
> a: 0f 85 a0 01 00 00 jne 0x1b0
> 10: 31 db xor %ebx,%ebx
> 12: 83 c4 38 add $0x38,%esp
> 15: 89 d8 mov %ebx,%eax
> 17: 5b pop %rbx
> 18: 5e pop %rsi
> 19: 5f pop %rdi
> 1a: 5d pop %rbp
> 1b: 31 d2 xor %edx,%edx
> 1d: 31 c9 xor %ecx,%ecx
> 1f: e9 60 6d be 01 jmp 0x1be6d84
> 24: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
> 28: 31 c0 xor %eax,%eax
> 2a:* 81 3b a0 cb 44 c4 cmpl $0xc444cba0,(%rbx) <-- trapping instruction
> 30: 0f 45 45 0c cmovne 0xc(%rbp),%eax
> 34: 83 fa 01 cmp $0x1,%edx
> 37: 89 45 f0 mov %eax,-0x10(%rbp)
> 3a: 0f 87 10 fb ff ff ja 0xfffffffffffffb50
>
> Code starting with the faulting instruction
> ===========================================
> 0: 81 3b a0 cb 44 c4 cmpl $0xc444cba0,(%rbx)
> 6: 0f 45 45 0c cmovne 0xc(%rbp),%eax
> a: 83 fa 01 cmp $0x1,%edx
> d: 89 45 f0 mov %eax,-0x10(%rbp)
> 10: 0f 87 10 fb ff ff ja 0xfffffffffffffb26
> [ 3.648776][ T1] EAX: 00000000 EBX: 00100016 ECX: 00000000 EDX: 00000000
> [ 3.649136][ T1] ESI: 00100016 EDI: 00000000 EBP: c01f1b7c ESP: c01f1b38
> [ 3.649504][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010046
> [ 3.649890][ T1] CR0: 80050033 CR2: 00100016 CR3: 0054bd80 CR4: 000406b0
> [ 3.650252][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 3.650611][ T1] DR6: fffe0ff0 DR7: 00000400
> [ 3.650863][ T1] Call Trace:
> [ 3.651036][ T1] ? show_regs (arch/x86/kernel/dumpstack.c:479)
> [ 3.651256][ T1] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)
> [ 3.651457][ T1] ? oops_enter (kernel/panic.c:642)
> [ 3.651680][ T1] ? page_fault_oops (arch/x86/mm/fault.c:715)
> [ 3.651927][ T1] ? __lock_acquire (kernel/locking/lockdep.c:5137)
> [ 3.652177][ T1] ? kernelmode_fixup_or_oops+0x68/0x8c
> [ 3.652513][ T1] ? __bad_area_nosemaphore+0x133/0x238
> [ 3.652850][ T1] ? bad_area_nosemaphore (arch/x86/mm/fault.c:835)
> [ 3.653116][ T1] ? do_user_addr_fault (arch/x86/mm/fault.c:1452)
> [ 3.653389][ T1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359)
> [ 3.653693][ T1] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539)
> [ 3.653952][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494)
> [ 3.654265][ T1] ? handle_exception (arch/x86/entry/entry_32.S:1054)
> [ 3.654524][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494)
> [ 3.654838][ T1] ? __lock_acquire (kernel/locking/lockdep.c:5006 (discriminator 1))
> [ 3.655087][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494)
> [ 3.655400][ T1] ? __lock_acquire (kernel/locking/lockdep.c:5006 (discriminator 1))
> [ 3.655650][ T1] ? register_lock_class (kernel/locking/lockdep.c:1285 (discriminator 13))
> [ 3.655916][ T1] ? filemap_get_entry (include/linux/rcupdate.h:339 include/linux/rcupdate.h:812 mm/filemap.c:1858)
> [ 3.656179][ T1] lock_acquire (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756)
> [ 3.656408][ T1] ? pmd_install (mm/memory.c:424)
> [ 3.656638][ T1] ? slow_virt_to_phys (arch/x86/mm/pat/set_memory.c:811)
> [ 3.656896][ T1] _raw_spin_lock (include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154)
> [ 3.657130][ T1] ? pmd_install (mm/memory.c:424)
> [ 3.657451][ T1] pmd_install (mm/memory.c:424)
> [ 3.657669][ T1] finish_fault (mm/memory.c:4870)
> [ 3.657902][ T1] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:63 (discriminator 13))
> [ 3.658156][ T1] do_pte_missing (mm/memory.c:5100 mm/memory.c:5193 mm/memory.c:3947)
> [ 3.658398][ T1] handle_pte_fault (mm/memory.c:5522)
> [ 3.658647][ T1] ? __lock_release+0x4f/0x17c
> [ 3.658921][ T1] __handle_mm_fault (mm/memory.c:5666)
> [ 3.659174][ T1] ? mt_find (lib/maple_tree.c:6952)
> [ 3.659394][ T1] ? __handle_mm_fault (mm/memory.c:5800)
> [ 3.659656][ T1] handle_mm_fault (mm/memory.c:5745 mm/memory.c:5832)
> [ 3.659897][ T1] ? lock_mm_and_find_vma (mm/memory.c:5921)
> [ 3.660167][ T1] do_user_addr_fault (include/linux/sched/signal.h:425 arch/x86/mm/fault.c:1391)
> [ 3.660426][ T1] exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539)
> [ 3.660663][ T1] ? find_held_lock (kernel/locking/lockdep.c:5244)
> [ 3.660905][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494)
> [ 3.661221][ T1] handle_exception (arch/x86/entry/entry_32.S:1054)
> [ 3.661478][ T1] EIP: clear_user (arch/x86/lib/usercopy_32.c:66)
> [ 3.661712][ T1] Code: 34 b8 00 00 00 c0 29 d8 39 c7 77 29 ba 42 00 00 00 b8 63 1d 95 c3 e8 fe 6f 5c fe 89 da 31 c0 c1 eb 02 83 e2 03 89 d9 8d 76 00 <f3> ab 89 d1 f3 aa 8d 76 00 89 cb 89 d8 5b 5f 5d 31 d2 31 c9 e9 4a
> All code
> ========
> 0: 34 b8 xor $0xb8,%al
> 2: 00 00 add %al,(%rax)
> 4: 00 c0 add %al,%al
> 6: 29 d8 sub %ebx,%eax
> 8: 39 c7 cmp %eax,%edi
> a: 77 29 ja 0x35
> c: ba 42 00 00 00 mov $0x42,%edx
> 11: b8 63 1d 95 c3 mov $0xc3951d63,%eax
> 16: e8 fe 6f 5c fe call 0xfffffffffe5c7019
> 1b: 89 da mov %ebx,%edx
> 1d: 31 c0 xor %eax,%eax
> 1f: c1 eb 02 shr $0x2,%ebx
> 22: 83 e2 03 and $0x3,%edx
> 25: 89 d9 mov %ebx,%ecx
> 27: 8d 76 00 lea 0x0(%rsi),%esi
> 2a:* f3 ab rep stos %eax,%es:(%rdi) <-- trapping instruction
> 2c: 89 d1 mov %edx,%ecx
> 2e: f3 aa rep stos %al,%es:(%rdi)
> 30: 8d 76 00 lea 0x0(%rsi),%esi
> 33: 89 cb mov %ecx,%ebx
> 35: 89 d8 mov %ebx,%eax
> 37: 5b pop %rbx
> 38: 5f pop %rdi
> 39: 5d pop %rbp
> 3a: 31 d2 xor %edx,%edx
> 3c: 31 c9 xor %ecx,%ecx
> 3e: e9 .byte 0xe9
> 3f: 4a rex.WX
>
> Code starting with the faulting instruction
> ===========================================
> 0: f3 ab rep stos %eax,%es:(%rdi)
> 2: 89 d1 mov %edx,%ecx
> 4: f3 aa rep stos %al,%es:(%rdi)
> 6: 8d 76 00 lea 0x0(%rsi),%esi
> 9: 89 cb mov %ecx,%ebx
> b: 89 d8 mov %ebx,%eax
> d: 5b pop %rbx
> e: 5f pop %rdi
> f: 5d pop %rbp
> 10: 31 d2 xor %edx,%edx
> 12: 31 c9 xor %ecx,%ecx
> 14: e9 .byte 0xe9
> 15: 4a rex.WX
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20240722/202407221607.49138a71-oliver.sang@xxxxxxxxx
>
>
>
