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bh=qxKHPmrLHSpXaEhqdYvFl7e0WLs/NEDBg3zrdUtq0Qs=; b=PfM9BPxRRxlsXYG3xYyMev4PKV AtVrV/pFcYCvKgql1Of69rLr/2CzN3f4H9c1PHhdKWs8odnwYCpF62Sb7ReToQKA0b6q17FEz1ypR wdQlnaSVBcRnvpFsP52DEPV/NRmQnhobmhxHE4SsH+UoDiHs8jxa5tdZVKRPTY5uQouMan43JOQOn pMjTO4dTjZNEVkEmIkStlXx0R2jfIJMclkkWm4cxN1jgkhWd3Xw0eryiWS7IMn1+E5GFmQnu8zNBI QEtMBS3Y3RtMSJbaY7nrN0137/QHi9alXJGdYEtLIn5nX8+U4vfvscHXqDc9DiwBqOvJuqVDT99Jf A5uYQW7Q==; Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rSd6X-00000006iKy-3ewZ; Wed, 24 Jan 2024 13:15:46 +0000 Date: Wed, 24 Jan 2024 13:15:45 +0000 From: Matthew Wilcox To: Miaohe Lin Cc: naoya.horiguchi@nec.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] mm/memory-failure: fix crash in split_huge_page_to_list from soft_offline_page Message-ID: References: <20240124084014.1772906-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240124084014.1772906-1-linmiaohe@huawei.com> X-Rspamd-Queue-Id: CD1DF100011 X-Rspam-User: X-Stat-Signature: jxibn6rp7m4mgx1188xe1wppsoffpx9p X-Rspamd-Server: rspam03 X-HE-Tag: 1706102150-189675 X-HE-Meta: U2FsdGVkX1/UNoZHMyexmpPpjVuTkk3sHFcfXE2stTJ7lO3wV4Mo0oYVINjS+F4MNyODSvDqYp9P3z6aMpCTctCVK6KORMlErgJDoTmPWahi4EeaJkYCx6SHKl9Gqp3atwep8vF/NcalEqCeZsddtJ7tAv8hjBgLWCnHxhz/7S8sdd6E0XymbLSyXO9PMi8okneyawxXevqLWkT3ZpYEOmRgZ5jbFk/D4Dwu+jr8vN2Bd7GlDM8/mR8J9Sf7fFUitxkYAfI7nmd2cwd4jXHhU4WZm/BacpRCsbn3CMUacAr2VAbZqLjsNGdhfsjzu8BhnOaQqAW029WNCCssXw8wZ3RD8YE47zcaTG6ztsykZ7bZrR31BPMrNrAkJ3UXKTx/OgJjIetZxDHxB6CBEgAnpc079HKcaNUjZLz5BBpl7fAFRnDOSoXF7RTRCl8nyZEzBmR4vNYGL1QmBaWStwotNYuvOXEIC2S6zlpyDzjqjb4U0akMGyC+2FUNo7bFYXxd3/xu0cJXk8wYrG07Kw2pbUBFbdqY1msWO4lypBa/algo1XWfgYZqjT913iARnWyFhdACe6maCiZa3Swn4vJ1/9haUwFLr1+csBXxwb1pZKOjyuR386hok6OzhGFLE/t/QYo8v9t7njBFLU2PJXrtBHT9YKkaju9NQZocCYZaT+XI7EBoWMQZMd8rAbWoXspnRZyNmprjYLlI8lEaM9zqjwsoKznh9Jkot7O277/AO2F6IgbiktpT4+ijzfsXUXCwU99YBwS7DrxKqMTNN/dj2DmX/dsuMd8LD27XZ9PzC9UkUc4WUUr6NIqJK4DVt4vG8G2P4xEAfcvSL6MnLnDVPs9x3bOXNt2o2YTtEvRbz80iYZZ8Y1NF/x9GkDLdU0vWTk+AyweAE0nsEqo4Tp+A/nZk2GKQpi6qxpoPBVp/ftnTuJ5yPgDGmsJHNZzhvZeQwWYuiCLbyGCBABO5erZ Ym87JLUN PZ38Yyn/dfZXqtMhIbK/JhLikpsHUnbjtT8pVSttfeHvMA5XNJdP+iDr96d8LETtFHArHOMo5rFGfwN9WCnGYjEewNUeVyirW9LVnlfhBPX5bDsOuY7I68r4835C/4Pm3vU7F/4oBrN1ABTpwqhjMDmoTp6xXMYnGVA5wK53we5UOvEs/T1/nF0HV0cNEl0p43juJza43+rcsmZiHJyAGapYBoAnQJmxfEvqSrOXmW5tcWFnfDlRkZH2BIQEySV4qLnBaheX5TgOHFLepZrYmBBFbsRRx8QmjIGFI5U+9iF6123O7OdUJ+ZhoubQgAFosMaK0 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: List-Subscribe: List-Unsubscribe: On Wed, Jan 24, 2024 at 04:40:14PM +0800, Miaohe Lin wrote: > When I did soft offline stress test, a machine was observed to crash with > the following message: > > kernel BUG at include/linux/memcontrol.h:554! > invalid opcode: 0000 [#1] PREEMPT SMP NOPTI > CPU: 5 PID: 3837 Comm: hwpoison.sh Not tainted 6.7.0-next-20240112-00001-g8ecf3e7fb7c8-dirty #97 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 > RIP: 0010:folio_memcg+0xaf/0xd0 > Code: 10 5b 5d c3 cc cc cc cc 48 c7 c6 08 b1 f2 b2 48 89 ef e8 b4 c5 f8 ff 90 0f 0b 48 c7 c6 d0 b0 f2 b2 48 89 ef e8 a2 c5 f8 ff 90 <0f> 0b 48 c7 c6 08 b1 f2 b2 48 89 ef e8 90 c5 f8 ff 90 0f 0b 66 66 > RSP: 0018:ffffb6c043657c98 EFLAGS: 00000296 > RAX: 000000000000004b RBX: ffff932bc1d1e401 RCX: ffff933abfb5c908 > RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff933abfb5c900 > RBP: ffffea6f04019080 R08: ffffffffb3338ce8 R09: 0000000000009ffb > R10: 00000000000004dd R11: ffffffffb3308d00 R12: ffffea6f04019080 > R13: ffffea6f04019080 R14: 0000000000000001 R15: ffffb6c043657da0 > FS: 00007f6c60f6b740(0000) GS:ffff933abfb40000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000559c3bc8b980 CR3: 0000000107f1c000 CR4: 00000000000006f0 > Call Trace: > > ? die+0x32/0x90 > ? do_trap+0xde/0x110 > ? folio_memcg+0xaf/0xd0 > ? do_error_trap+0x60/0x80 > ? folio_memcg+0xaf/0xd0 > ? exc_invalid_op+0x53/0x70 > ? folio_memcg+0xaf/0xd0 > ? asm_exc_invalid_op+0x1a/0x20 > ? folio_memcg+0xaf/0xd0 > ? folio_memcg+0xae/0xd0 I might trim these ? lines out of the backtrace ... > split_huge_page_to_list+0x4d/0x1380 > ? sysvec_apic_timer_interrupt+0xf/0x80 > try_to_split_thp_page+0x3a/0xf0 > soft_offline_page+0x1ea/0x8a0 > soft_offline_page_store+0x52/0x90 > kernfs_fop_write_iter+0x118/0x1b0 > vfs_write+0x30b/0x430 > ksys_write+0x5e/0xe0 > do_syscall_64+0xb0/0x1b0 > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > RIP: 0033:0x7f6c60d14697 > Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 > RSP: 002b:00007ffe9b72b8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007f6c60d14697 > RDX: 000000000000000c RSI: 0000559c3bc8b980 RDI: 0000000000000001 > RBP: 0000559c3bc8b980 R08: 00007f6c60dd1460 R09: 000000007fffffff > R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c > R13: 00007f6c60e1a780 R14: 00007f6c60e16600 R15: 00007f6c60e15a00 > > The problem is that page->mapping is overloaded with slab->slab_list or > slabs fields now, so slab pages could be taken as non-LRU movable pages > if field slabs contains PAGE_MAPPING_MOVABLE or slab_list->prev is set > to LIST_POISON2. These slab pages will be treated as thp later leading > to crash in split_huge_page_to_list(). > > Signed-off-by: Miaohe Lin > Fixes: 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to allow larger rcu_head") Reviewed-by: Matthew Wilcox (Oracle)