From nobody Sun Feb 8 02:55:33 2026 Received: from invmail4.hynix.com (exvmail4.skhynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 1FA7A59B47; Fri, 16 Feb 2024 11:16:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708082170; cv=none; b=pZOBSZ4gcWlE5LOVtjGtxa/ZHD0InsBDvjT2UHaKXt2pEIir/U82Lz4aqdTTN87dMjmIcD1aDuGJX9/82MPjV4s61lqyObBpQZV2Z0b0Dakf4/N3Aj25HC7b1/517IVf45nkkg5tGOCx2H/7vN0FiCyD/Wclv5vzE6GUY6NzKTg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708082170; c=relaxed/simple; bh=9cQF1rIO8RSJzsP9my6CHgiO2RH8oNNFSgPkEebj1tw=; h=From:To:Cc:Subject:Date:Message-Id; b=CFoPGVN0hRn/lCQ+mEuG8k8zWQLZVfTqoyxOvloJoTl63xsT1KjZ4F3tcwhvOOUxjZW5Zl8vANe2hPUEa7pyO51dOOKLBGOhEJBglOb7VCzlfT6n9yFp+aTmUsjGux6f21oERyWwQV3PIGIp3yFlpEL8Hyy1fBtYXaNmdVlaSaQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-d85ff70000001748-14-65cf43f15fe6 From: Byungchul Park To: akpm@linux-foundation.org, ying.huang@intel.com, osalvador@suse.de, baolin.wang@linux.alibaba.com, hannes@cmpxchg.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel_team@skhynix.com, stable@vger.kernel.org Subject: [PATCH] mm/vmscan: Fix a bug calling wakeup_kswapd() with a wrong zone index Date: Fri, 16 Feb 2024 20:15:02 +0900 Message-Id: <20240216111502.79759-1-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpiluLIzCtJLcpLzFFi42LhesuzUPej8/lUgxcLBSzmrF/DZvF/7zFG i9WbfC0u75rDZnFvzX9WizPTiiwWbHzEaHFy1mQWBw6Pw2/eM3ss3vOSyWPTp0nsHidm/Gbx 2PnQ0mPz6WqPz5vkAtijuGxSUnMyy1KL9O0SuDJ+zr/OVNAsUbF+gXADY7NIFyMnh4SAicS0 u+vYYewVP3+xgNhsAuoSN278ZO5i5OIQEWhklPj0bAdYEbNAtsS9Gf1MILawQKhE59s7jCA2 i4CqRPfaJlYQm1fAVGLxtEWsEEPlJVZvOMAMYX9klZg22xHClpQ4uOIGywRG7gWMDKsYhTLz ynITM3NM9DIq8zIr9JLzczcxAkNmWe2f6B2Mny4EH2IU4GBU4uE98OdsqhBrYllxZe4hRgkO ZiUR3km9Z1KFeFMSK6tSi/Lji0pzUosPMUpzsCiJ8xp9K08REkhPLEnNTk0tSC2CyTJxcEo1 MLJ3soR4FXO1zmN0ldR+J61Tzt8TnHTyKOvCtJ+dbx6FurFneNj0sjBNPXnqQYb5FbuW1mtR b1I3PKrw+PhgvUJ5nUyshNWpj7NvSvzPZ3r5oI5v7gPBD6cMKvIKIu5JX52d8l5t86J5xo/y LtyW415Y7WF0Y5/rXD3T7PeG2YtC5N58mKlWqMRSnJFoqMVcVJwIAJhkPsgVAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrFJMWRmVeSWpSXmKPExsXC5WfdrPvR+XyqwaurTBZz1q9hs/i/9xij xepNvhaH555ktbi8aw6bxb01/1ktzkwrsliw8RGjxclZk1kcOD0Ov3nP7LF4z0smj02fJrF7 nJjxm8Vj50NLj8UvPjB5bD5d7fF5k1wARxSXTUpqTmZZapG+XQJXxs/515kKmiUq1i8QbmBs Fuli5OSQEDCRWPHzFwuIzSagLnHjxk/mLkYuDhGBRkaJT892sIMkmAWyJe7N6GcCsYUFQiU6 395hBLFZBFQlutc2sYLYvAKmEounLWKFGCovsXrDAeYJjBwLGBlWMYpk5pXlJmbmmOoVZ2dU 5mVW6CXn525iBIbAsto/E3cwfrnsfohRgINRiYf3wJ+zqUKsiWXFlbmHGCU4mJVEeCf1nkkV 4k1JrKxKLcqPLyrNSS0+xCjNwaIkzusVnpogJJCeWJKanZpakFoEk2Xi4JRqYNxk0mHso510 I6HTz3nvcqFHMw26q07Uuh6/cGuvkdee8CNHHwbfrnwn2nyRqfTvIxnm/7fcncK/zjGpvn8g 8OHE829eT353KSbeLu+r0CmJtLC2lvmfCrVk2VU5eqKn2J8Nm7a7dP8umRiFZMn1Knc3/9Or PVHJtodl9jmfSxuFJ9mZLboTcE+JpTgj0VCLuag4EQCvUs+P/QEAAA== X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" With numa balancing on, when a numa system is running where a numa node doesn't have its local memory so it has no managed zones, the following oops has been observed. It's because wakeup_kswapd() is called with a wrong zone index, -1. Fixed it by checking the index before calling wakeup_kswapd(). > BUG: unable to handle page fault for address: 00000000000033f3 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 0 P4D 0 > Oops: 0000 [#1] PREEMPT SMP NOPTI > CPU: 2 PID: 895 Comm: masim Not tainted 6.6.0-dirty #255 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 > RIP: 0010:wakeup_kswapd (./linux/mm/vmscan.c:7812) > Code: (omitted) > RSP: 0000:ffffc90004257d58 EFLAGS: 00010286 > RAX: ffffffffffffffff RBX: ffff88883fff0480 RCX: 0000000000000003 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88883fff0480 > RBP: ffffffffffffffff R08: ff0003ffffffffff R09: ffffffffffffffff > R10: ffff888106c95540 R11: 0000000055555554 R12: 0000000000000003 > R13: 0000000000000000 R14: 0000000000000000 R15: ffff88883fff0940 > FS: 00007fc4b8124740(0000) GS:ffff888827c00000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000000033f3 CR3: 000000026cc08004 CR4: 0000000000770ee0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Call Trace: > > ? __die > ? page_fault_oops > ? __pte_offset_map_lock > ? exc_page_fault > ? asm_exc_page_fault > ? wakeup_kswapd > migrate_misplaced_page > __handle_mm_fault > handle_mm_fault > do_user_addr_fault > exc_page_fault > asm_exc_page_fault > RIP: 0033:0x55b897ba0808 > Code: (omitted) > RSP: 002b:00007ffeefa821a0 EFLAGS: 00010287 > RAX: 000055b89983acd0 RBX: 00007ffeefa823f8 RCX: 000055b89983acd0 > RDX: 00007fc2f8122010 RSI: 0000000000020000 RDI: 000055b89983acd0 > RBP: 00007ffeefa821a0 R08: 0000000000000037 R09: 0000000000000075 > R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 > R13: 00007ffeefa82410 R14: 000055b897ba5dd8 R15: 00007fc4b8340000 > Signed-off-by: Byungchul Park Reported-by: Hyeongtak Ji Cc: stable@vger.kernel.org Fixes: c574bbe917036 ("NUMA balancing: optimize page placement for memory t= iering system") --- mm/migrate.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/migrate.c b/mm/migrate.c index fbc8586ed735..51ee6865b0f6 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2825,6 +2825,14 @@ static int numamigrate_isolate_folio(pg_data_t *pgda= t, struct folio *folio) if (managed_zone(pgdat->node_zones + z)) break; } + + /* + * If there are no managed zones, it should not proceed + * further. + */ + if (z < 0) + return 0; + wakeup_kswapd(pgdat->node_zones + z, 0, folio_order(folio), ZONE_MOVABLE); return 0; --=20 2.17.1