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Date:   Tue, 25 Aug 2020 23:02:40 -0400
From:   Qian Cai <cai@....pw>
To:     Rong Chen <rong.a.chen@...el.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [mm] c566586818: BUG:kernel_hang_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok



> On Aug 25, 2020, at 8:44 PM, Rong Chen <rong.a.chen@...el.com> wrote:
> 
> I rebuilt the kernel on commit c566586818 but the error changed to "RIP: 0010:clear_page_orig+0x12/0x40",
> and the error can be reproduced on parent commit:

Catalin, any thought? Sounds like those early kmemleak allocations cause some sort of memory corruption?

> 
> [    0.539811] Memory: 12325340K/12680692K available (10243K kernel code, 2414K rwdata, 8188K rodata, 856K init, 14628K bss, 355352K reserved, 0K cma-reserved)
> [    4.133400] BUG: unable to handle page fault for address: ffff88833653e000
> [    4.134130] #PF: supervisor write access in kernel mode
> [    4.134694] #PF: error_code(0x0002) - not-present page
> [    4.135177] PGD 3800067 P4D 3800067 PUD f000e6f2f000d445 PMD 0
> [    4.135730] Thread overran stack, or stack corrupted
> [    4.136192] Oops: 0002 [#1] DEBUG_PAGEALLOC PTI
> [    4.136609] CPU: 0 PID: 0 Comm: swapper Not tainted 5.3.0-11792-gc5665868183fe #1
> [    4.137300] RIP: 0010:clear_page_orig+0x12/0x40
> [    4.137732] Code: 03 00 00 00 b0 01 5b c3 b9 00 02 00 00 31 c0 f3 48 ab c3 0f 1f 44 00 00 31 c0 b9 40 00 00 00 66 0f 1f 84 00 00 00 00 00 ff c9 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47
> [    4.139453] RSP: 0000:ffffffff8239d8e8 EFLAGS: 00010016
> [    4.139939] RAX: 0000000000000000 RBX: 0000000000000101 RCX: 000000000000003f
> [    4.140602] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88833653e000
> [    4.141261] RBP: ffffea000cd94f80 R08: ffffffff82427800 R09: ffffea000cd94f80
> [    4.141956] R10: 0000160000000000 R11: ffff888000000000 R12: 0000000000000000
> [    4.142642] R13: 0000000000000001 R14: 0000000000092000 R15: 0000000000000046
> [    4.143298] FS:  0000000000000000(0000) GS:ffffffff8243d000(0000) knlGS:0000000000000000
> [    4.144076] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    4.144661] CR2: ffff88833653e000 CR3: 0000000002420000 CR4: 00000000000006b0
> [    4.145382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [    4.146121] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [    4.146829] Call Trace:
> [    4.147066] Modules linked in:
> [    4.147359] CR2: ffff88833653e000
> [    4.147757] random: get_random_bytes called from init_oops_id+0x1d/0x2c with crng_init=0
> 
> $ ./scripts/faddr2line vmlinux clear_page_orig+0x12/0x40
> clear_page_orig+0x12/0x40:
> clear_page_orig at arch/x86/lib/clear_page_64.S:31
> 
> 
> but I also can reproduced the lookup_address_in_pgd error in v5.9-rc2 with attached config file:
> 
> [    0.382789] Memory: 12313044K/12680692K available (10242K kernel code, 2658K rwdata, 8916K rodata, 800K init, 24540K bss, 367392K reserved, 0K cma-reserved)
> [    4.027977] general protection fault, probably for non-canonical address 0xf0006f7280000d98: 0000 [#1] DEBUG_PAGEALLOC PTI
> [    4.029094] CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-rc2 #1
> [    4.029741] RIP: 0010:lookup_address_in_pgd+0x7c/0xcc
> [    4.030341] Code: 00 00 48 3d 81 00 00 00 74 6c 4c 89 df e8 9d f2 ff ff 48 f7 d0 4c 21 d8 a8 01 74 5a 4c 89 d6 4c 89 df e8 fd f5 ff ff 49 89 c0 <48> f7 00 9f ff ff ff 74 93 41 c7 01 02 00 00 00 48 8b 08 48 89 cf
> [    4.032205] RSP: 0000:ffffffff82453a08 EFLAGS: 00010082
> [    4.032716] RAX: f0006f7280000d98 RBX: 0000000000000001 RCX: f000e6f280000000
> [    4.033569] RDX: ffff888000000000 RSI: ffff888000000d98 RDI: f000e6f2f000d400
> [    4.034474] RBP: ffffffff82453b28 R08: f0006f7280000d98 R09: ffffffff82453a48
> [    4.035125] R10: ffff88833664c000 R11: f000e6f2f000d445 R12: ffff88833664c000
> [    4.035836] R13: 0000000000000001 R14: ffff888000000000 R15: ffffffff827806b8
> [    4.036575] FS:  0000000000000000(0000) GS:ffffffff82641000(0000) knlGS:0000000000000000
> [    4.037389] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    4.037961] CR2: ffff8883447ff000 CR3: 0000000002622000 CR4: 00000000000006b0
> [    4.038677] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [    4.039388] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [    4.040243] Call Trace:
> [    4.040552] Modules linked in:
> [    4.041033] random: get_random_bytes called from init_oops_id+0x1d/0x2c with crng_init=0
> 
> $ ./scripts/faddr2line vmlinux lookup_address_in_pgd+0x7c/0xcc
> lookup_address_in_pgd+0x7c/0xcc:
> lookup_address_in_pgd at arch/x86/mm/pat/set_memory.c:604
> (inlined by) lookup_address_in_pgd at arch/x86/mm/pat/set_memory.c:575

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