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imf25.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf25.hostedemail.com: domain of regressions@leemhuis.info designates 80.237.130.52 as permitted sender) smtp.mailfrom=regressions@leemhuis.info ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1681729982; a=rsa-sha256; cv=none; b=JTjzwA1tnep2IUuBmbH+dc8Aq8ZIhKK6nR2GV5IMSMfiwAm5R5RiNx2cDr3pov5Yn2vHlO TF8wP/Vh592Lj48yYQVrc52L2DQ0ODkWJQYsUmMZPWuZeDdpGxcWXxMiv//ztWgJjJlQzJ oQVJuQjyaxu3/8i5UpoaZII0Zz1xs3Q= Received: from [2a02:8108:8980:2478:8cde:aa2c:f324:937e]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1poMn4-0006bW-Jw; Mon, 17 Apr 2023 13:12:58 +0200 Message-ID: Date: Mon, 17 Apr 2023 13:12:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [Bug 216646] having TRANSPARENT_HUGEPAGE enabled hangs some applications (supervisor read access in kernel mode) Content-Language: en-US, de-DE From: "Linux regression tracking (Thorsten Leemhuis)" To: Matthew Wilcox Cc: bugzilla-daemon@kernel.org, linux-mm@kvack.org, Andrew Morton , decedion@gmail.com, Mikhail Pletenv , Linux regressions mailing list Reply-To: Linux regressions mailing list , Linux regressions mailing list References: <20221121125400.334190a6d2791b0c9afbfea0@linux-foundation.org> <220fd094-7cf1-9d17-8380-98d5663dc5da@leemhuis.info> <20221203014420.76281b930dbc64f51eda0f8b@gmail.com> <20221206050845.6ba9351cef3295be4b923ea8@gmail.com> <69b81148-8e62-d697-e92b-c3b042214a09@leemhuis.info> <7f90d893-c6ac-1fc9-3804-daa77b9f43fd@leemhuis.info> In-Reply-To: <7f90d893-c6ac-1fc9-3804-daa77b9f43fd@leemhuis.info> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1681729981;20e726a0; X-HE-SMSGID: 1poMn4-0006bW-Jw X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B1D34A0005 X-Stat-Signature: u4k7yepjh1azodfumn818j4ogtusshgn X-HE-Tag: 1681729981-832457 X-HE-Meta: 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 bIezqIXn IsxbO09/JT/mdmp/geYfanIWN2M0EkHlnUPrt2KrblrkpFKtS25W7CzkouzQaDkWNkoKZ/zhN+z/tFDfYF/kVE0eYJhFVcdLvleXPjDWFL1T4qFr/11Gv/T1FqH8hWRvwASGxZnvHcOet035atzS5NmYddSsj84FWnAamAS723g70Jdxfg184I05d1Iv396LvAUW5rsoaprQz0OMu0BcR6OvflHr0lApiIR55tNuJTbbQ+DJuXO+b5nELvFn+CLy7/PZJy+XBCmgN8DLuw5taCJyV3fOxKophsfPPEd7gg3ZLrj58pMC2csiNcoEo7K5S9QUKBK44EKI/lEyMIkupPD1y16P5bv1CYM4pIEfZGrUT0CIUyRdzmzEyPTraYQtumbt5Zz+wJCyetdjEpYUntXPHz7IcvWi145zK7dMC1Z8n9HkDnqgYbA2tc2No+oNCsdE6x7m4dRZuJXfTIeNcsvI6MSNaAxPORohehA0zXbmOgwXfVNmq1M3MYsM50tDv+vR32yjoPPbIBOpFjHjbxSTBBD5p9m3zI58c X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 14.03.23 11:17, Linux regression tracking (Thorsten Leemhuis) wrote: > On 24.02.23 19:08, Mikhail Pletenv wrote: >> I did some more testing on v6.1.12 and reproduced the issue. But i have >> new bit of information: since the last time i've seen this issue i've >> migrated most of my storage from XFS to BTRFS and i couldn't reproduce >> the issue again today until i switched the source volume in the test >> back to XFS. So it seems bug is either in the way that XFS talks to >> mm/folios or is just triggered by it. >> >> anyway, i attached a report from v6.1.2 (seems to be happening in the >> same place) > > Hi Willy! I'd like to bring this back onto your radar, as this > regression is still unsolved afaics -- the patch you provided only > partially helped. Or was progress to fix this made in a different thread > and I just missed it? Willy, I know, I'm kinda annoying, but it's part of my job, hence please allow me to ask: Do you still have this regression on your todo list somewhere? The problem is now known and bisected since November. I understand that this is not something that can be fixed quickly, but at the same time it's quite a while already. Or has progress to fix this been made and I just it? Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page. >> On 2/24/23 13:21, Linux regression tracking (Thorsten Leemhuis) wrote: >>> On 16.12.22 06:23, Thorsten Leemhuis wrote: >>>> Hi, this is your Linux kernel regression tracker. Top-posting for once, >>>> to make this easily accessible to everyone. >>> /me again >>> >>>> Was some progress made to get this regression resolved? From here it >>>> looks kinda stalled, that's why I'm asking -- but maybe I just missed >>>> something. >>> Did anything happen to get this regression resolved? Doesn't look like >>> it, but maybe I missed some progress. >>> >>> Willy, Mikhail confirmed off-list to me that the problem still exists. >>> He also tried you patch and reported back. Is there something else you >>> need? >>> >>> Side note: I lost this out of sight during the festive season and should >>> have asked this earlier, but better late than never. :-D >>> >>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) >>> -- >>> Everything you wanna know about Linux kernel regression tracking: >>> https://linux-regtracking.leemhuis.info/about/#tldr >>> If I did something stupid, please tell me, as explained on that page. >>> >>> #regzbot poke >>> >>>> On 06.12.22 03:08, Mikhail Pletnev wrote: >>>>> On Mon, 5 Dec 2022 20:25:11 +0000 >>>>> Matthew Wilcox wrote: >>>>>> Thanks!  I think this may be the problem ... >>>>>> >>>>> Hi Matthew, thanks for swift response, i've applied your last patch >>>>> and ran my stress test a couple of times. It's still constistently >>>>> crashing (albeit it seems in a different place): >>>>> >>>>> [ 1975.257126] ***BAD SIBLING*** index 912583 offset 4 >>>>> [ 1975.257128] node ffff9fc817e01ff0 offset 51 parent >>>>> ffff9fc5c7a31ff0 shift 0 count 64 values 48 array ffff9fc521173e80 >>>>> list ffff9fc817e02008 ffff9fc817e02008 marks 0 0 0 >>>>> [ 1975.257133] BUG: kernel NULL pointer dereference, address: >>>>> 0000000000000036 >>>>> [ 1975.257135] #PF: supervisor read access in kernel mode >>>>> [ 1975.257137] #PF: error_code(0x0000) - not-present page >>>>> [ 1975.257138] PGD 0 P4D 0 >>>>> [ 1975.257139] Oops: 0000 [#1] PREEMPT SMP NOPTI >>>>> [ 1975.257141] CPU: 5 PID: 8303 Comm: deluge-gtk Not tainted >>>>> 5.17.0-rc4_ap_test-00163-g793917d997df-dirty #6 >>>>> [ 1975.257144] Hardware name: Micro-Star International Co., Ltd. >>>>> MS-7C35/MEG X570 UNIFY (MS-7C35), BIOS A.C3 03/15/2022 >>>>> [ 1975.257146] RIP: 0010:__filemap_get_folio >>>>> (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/atomic.h:29 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1158 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1183 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-instrumented.h:608 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:238 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:247 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:280 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:313 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1899 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1951) >>>>> [ 1975.257152] Code: 10 e8 56 fd 67 00 48 89 c3 48 3d 02 04 00 00 74 >>>>> e2 48 3d 06 04 00 00 74 da 48 85 c0 0f 84 3e 02 00 00 a8 01 0f 85 40 >>>>> 02 00 00 <8b> 40 34 85 c0 74 c2 8d 50 01 f0 0f b1 53 34 75 f2 48 8b >>>>> 54 24 28 >>>>> All code >>>>> ======== >>>>>     0:    10 e8                    adc    %ch,%al >>>>>     2:    56                       push   %rsi >>>>>     3:    fd                       std >>>>>     4:    67 00 48 89              add    %cl,-0x77(%eax) >>>>>     8:    c3                       ret >>>>>     9:    48 3d 02 04 00 00        cmp    $0x402,%rax >>>>>     f:    74 e2                    je     0xfffffffffffffff3 >>>>>    11:    48 3d 06 04 00 00        cmp    $0x406,%rax >>>>>    17:    74 da                    je     0xfffffffffffffff3 >>>>>    19:    48 85 c0                 test   %rax,%rax >>>>>    1c:    0f 84 3e 02 00 00        je     0x260 >>>>>    22:    a8 01                    test   $0x1,%al >>>>>    24:    0f 85 40 02 00 00        jne    0x26a >>>>>    2a:*    8b 40 34                 mov    0x34(%rax),%eax        >>>>> <-- trapping instruction >>>>>    2d:    85 c0                    test   %eax,%eax >>>>>    2f:    74 c2                    je     0xfffffffffffffff3 >>>>>    31:    8d 50 01                 lea    0x1(%rax),%edx >>>>>    34:    f0 0f b1 53 34           lock cmpxchg %edx,0x34(%rbx) >>>>>    39:    75 f2                    jne    0x2d >>>>>    3b:    48 8b 54 24 28           mov    0x28(%rsp),%rdx >>>>> >>>>> Code starting with the faulting instruction >>>>> =========================================== >>>>>     0:    8b 40 34                 mov    0x34(%rax),%eax >>>>>     3:    85 c0                    test   %eax,%eax >>>>>     5:    74 c2                    je     0xffffffffffffffc9 >>>>>     7:    8d 50 01                 lea    0x1(%rax),%edx >>>>>     a:    f0 0f b1 53 34           lock cmpxchg %edx,0x34(%rbx) >>>>>     f:    75 f2                    jne    0x3 >>>>>    11:    48 8b 54 24 28           mov    0x28(%rsp),%rdx >>>>> [ 1975.257154] RSP: 0000:ffffc2d744c37cb0 EFLAGS: 00010246 >>>>> [ 1975.257155] RAX: 0000000000000002 RBX: 0000000000000002 RCX: >>>>> 0000000000000000 >>>>> [ 1975.257156] RDX: 0000000000000000 RSI: ffffffffbb117459 RDI: >>>>> 00000000ffffffff >>>>> [ 1975.257157] RBP: 0000000000000000 R08: 00000000ffffdfff R09: >>>>> 00000000ffffdfff >>>>> [ 1975.257158] R10: ffffffffbb472dc0 R11: ffffffffbb472dc0 R12: >>>>> 0000000000000000 >>>>> [ 1975.257159] R13: ffff9fc521173e78 R14: 00000000000decc7 R15: >>>>> fff000003fffffff >>>>> [ 1975.257160] FS:  00007fb2137fe6c0(0000) GS:ffff9fcb7eb40000(0000) >>>>> knlGS:0000000000000000 >>>>> [ 1975.257161] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>>> [ 1975.257162] CR2: 0000000000000036 CR3: 0000000164114000 CR4: >>>>> 0000000000750ee0 >>>>> [ 1975.257163] PKRU: 55555554 >>>>> [ 1975.257163] Call Trace: >>>>> [ 1975.257164]  >>>>> [ 1975.257166] ? page_add_file_rmap >>>>> (/home/reinhardt/dev-apps/kernel/linux/./include/linux/page-flags.h:195 /home/reinhardt/dev-apps/kernel/linux/mm/internal.h:440 /home/reinhardt/dev-apps/kernel/linux/mm/rmap.c:1270) >>>>> [ 1975.257169] filemap_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/./include/linux/pagemap.h:531 >>>>> /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:3107) >>>>> [ 1975.257172] __do_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:3852) >>>>> [ 1975.257174] __handle_mm_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4169 >>>>> /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4297 >>>>> /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4555 >>>>> /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4690) >>>>> [ 1975.257176] handle_mm_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4788) >>>>> [ 1975.257178] do_user_addr_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/./include/linux/sched/signal.h:404 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1399) >>>>> [ 1975.257181] exc_page_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/irqflags.h:40 /home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/irqflags.h:75 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1492 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1540) >>>>> [ 1975.257184] ? asm_exc_page_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/idtentry.h:568) >>>>> [ 1975.257186] asm_exc_page_fault >>>>> (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/idtentry.h:568) >>>>> [ 1975.257188] RIP: 0033:0x7fb265b88409 >>>>> [ 1975.257189] Code: 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f >>>>> 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 83 fa >>>>> 20 72 27 fe 6f 06 48 83 fa 40 0f 87 a9 00 00 00 c5 fe 6f 4c 16 >>>>> e0 c5 fe >>>>> All code >>>>> ======== >>>>>     0:    66 66 2e 0f 1f 84 00     data16 cs nopw 0x0(%rax,%rax,1) >>>>>     7:    00 00 00 00 >>>>>     b:    66 66 2e 0f 1f 84 00     data16 cs nopw 0x0(%rax,%rax,1) >>>>>    12:    00 00 00 00 >>>>>    16:    66 66 2e 0f 1f 84 00     data16 cs nopw 0x0(%rax,%rax,1) >>>>>    1d:    00 00 00 00 >>>>>    21:    48 89 f8                 mov    %rdi,%rax >>>>>    24:    48 83 fa 20              cmp    $0x20,%rdx >>>>>    28:    72 27                    jb     0x51 >>>>>    2a:*    c5 fe 6f 06              vmovdqu (%rsi),%ymm0        <-- >>>>> trapping instruction >>>>>    2e:    48 83 fa 40              cmp    $0x40,%rdx >>>>>    32:    0f 87 a9 00 00 00        ja     0xe1 >>>>>    38:    c5 fe 6f 4c 16 e0        vmovdqu -0x20(%rsi,%rdx,1),%ymm1 >>>>>    3e:    c5                       .byte 0xc5 >>>>>    3f:    fe                       .byte 0xfe >>>>> >>>>> Code starting with the faulting instruction >>>>> =========================================== >>>>>     0:    c5 fe 6f 06              vmovdqu (%rsi),%ymm0 >>>>>     4:    48 83 fa 40              cmp    $0x40,%rdx >>>>>     8:    0f 87 a9 00 00 00        ja     0xb7 >>>>>     e:    c5 fe 6f 4c 16 e0        vmovdqu -0x20(%rsi,%rdx,1),%ymm1 >>>>>    14:    c5                       .byte 0xc5 >>>>>    15:    fe                       .byte 0xfe >>>>> [ 1975.257190] RSP: 002b:00007fb2137fd908 EFLAGS: 00010202 >>>>> [ 1975.257191] RAX: 00007fb204012a80 RBX: 0000000000000000 RCX: >>>>> 00007fb2137fda90 >>>>> [ 1975.257192] RDX: 0000000000004000 RSI: 00007f9fddbb51c3 RDI: >>>>> 00007fb204012a80 >>>>> [ 1975.257193] RBP: 00007fb2137fd928 R08: 00000000638ea1ab R09: >>>>> 0000000000000000 >>>>> [ 1975.257193] R10: 0000000000000008 R11: 0000000000000246 R12: >>>>> 00007fb204000bb0 >>>>> [ 1975.257194] R13: 00007fb21809a5a0 R14: 00000000decc71c3 R15: >>>>> 0000000000004000 >>>>> [ 1975.257196]  >>>>> [ 1975.257196] Modules linked in: overlay xt_addrtype amdgpu >>>>> drm_ttm_helper ttm gpu_sched drm_kms_helper iwlmvm backlight >>>>> syscopyarea mac80211 sysfillrect sysimgblt libarc4 fb_sys_fops >>>>> iwlwifi cfg80211 i2c_piix4 k10temp fuse configfs efivarfs >>>>> [ 1975.257207] CR2: 0000000000000036 >>>>> [ 1975.257208] ---[ end trace 0000000000000000 ]--- >>>>> [ 1975.257209] RIP: 0010:__filemap_get_folio >>>>> (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/atomic.h:29 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1158 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1183 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-instrumented.h:608 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:238 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:247 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:280 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:313 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1899 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1951) >>>>> [ 1975.257211] Code: 10 e8 56 fd 67 00 48 89 c3 48 3d 02 04 00 00 74 >>>>> e2 48 3d 06 04 00 00 74 da 48 85 c0 0f 84 3e 02 00 00 a8 01 0f 85 40 >>>>> 02 00 00 <8b> 40 34 85 c0 74 c2 8d 50 01 f0 0f b1 53 34 75 f2 48 8b >>>>> 54 24 28 >>>>> All code >>>>> ======== >>>>>     0:    10 e8                    adc    %ch,%al >>>>>     2:    56                       push   %rsi >>>>>     3:    fd                       std >>>>>     4:    67 00 48 89              add    %cl,-0x77(%eax) >>>>>     8:    c3                       ret >>>>>     9:    48 3d 02 04 00 00        cmp    $0x402,%rax >>>>>     f:    74 e2                    je     0xfffffffffffffff3 >>>>>    11:    48 3d 06 04 00 00        cmp    $0x406,%rax >>>>>    17:    74 da                    je     0xfffffffffffffff3 >>>>>    19:    48 85 c0                 test   %rax,%rax >>>>>    1c:    0f 84 3e 02 00 00        je     0x260 >>>>>    22:    a8 01                    test   $0x1,%al >>>>>    24:    0f 85 40 02 00 00        jne    0x26a >>>>>    2a:*    8b 40 34                 mov    0x34(%rax),%eax        >>>>> <-- trapping instruction >>>>>    2d:    85 c0                    test   %eax,%eax >>>>>    2f:    74 c2                    je     0xfffffffffffffff3 >>>>>    31:    8d 50 01                 lea    0x1(%rax),%edx >>>>>    34:    f0 0f b1 53 34           lock cmpxchg %edx,0x34(%rbx) >>>>>    39:    75 f2                    jne    0x2d >>>>>    3b:    48 8b 54 24 28           mov    0x28(%rsp),%rdx >>>>> >>>>> Code starting with the faulting instruction >>>>> =========================================== >>>>>     0:    8b 40 34                 mov    0x34(%rax),%eax >>>>>     3:    85 c0                    test   %eax,%eax >>>>>     5:    74 c2                    je     0xffffffffffffffc9 >>>>>     7:    8d 50 01                 lea    0x1(%rax),%edx >>>>>     a:    f0 0f b1 53 34           lock cmpxchg %edx,0x34(%rbx) >>>>>     f:    75 f2                    jne    0x3 >>>>>    11:    48 8b 54 24 28           mov    0x28(%rsp),%rdx >>>>> [ 1975.257212] RSP: 0000:ffffc2d744c37cb0 EFLAGS: 00010246 >>>>> [ 1975.257213] RAX: 0000000000000002 RBX: 0000000000000002 RCX: >>>>> 0000000000000000 >>>>> [ 1975.257214] RDX: 0000000000000000 RSI: ffffffffbb117459 RDI: >>>>> 00000000ffffffff >>>>> [ 1975.257215] RBP: 0000000000000000 R08: 00000000ffffdfff R09: >>>>> 00000000ffffdfff >>>>> [ 1975.257215] R10: ffffffffbb472dc0 R11: ffffffffbb472dc0 R12: >>>>> 0000000000000000 >>>>> [ 1975.257216] R13: ffff9fc521173e78 R14: 00000000000decc7 R15: >>>>> fff000003fffffff >>>>> [ 1975.257217] FS:  00007fb2137fe6c0(0000) GS:ffff9fcb7eb40000(0000) >>>>> knlGS:0000000000000000 >>>>> [ 1975.257218] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>>> [ 1975.257219] CR2: 0000000000000036 CR3: 0000000164114000 CR4: >>>>> 0000000000750ee0 >>>>> [ 1975.257220] PKRU: 55555554 >>>>> >>>>> (full dmesg and my local changeset in attachments for your reference) >>>>> >>>> #regzbot poke >>>> > >