From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3z33Fc638yzF0BP for ; Fri, 22 Dec 2017 20:32:34 +1100 (AEDT) Subject: Re: WARNING: CPU: 0 PID: 2777 at arch/powerpc/mm/hugetlbpage.c:354 h,ugetlb_free_pgd_range+0xc8/0x1e4 From: Christophe LEROY To: "Aneesh Kumar K.V" , "linuxppc-dev@lists.ozlabs.org" References: Message-ID: <752a6444-dc65-88e0-343f-d3361ec042cc@c-s.fr> Date: Fri, 22 Dec 2017 10:32:26 +0100 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Le 20/12/2017 à 13:17, Christophe LEROY a écrit : > Trying to malloc() with libhugetlbfs, it runs indefinitly doing page > faults in do_page_fault()/hugetlb_fault(). > When interrupting the blocked app with CTRL+C, I get the following WARNING: > > Any idea of what can be wrong ? I'm on a 8xx with 512k huge pages. It looks like something goes wrong when the app tries to mmap a hugetlbpage at a given address. When it requests the page with a NULL address, it works well. Any idea ? Christophe > > [162980.035629] WARNING: CPU: 0 PID: 2777 at > arch/powerpc/mm/hugetlbpage.c:354 h > ugetlb_free_pgd_range+0xc8/0x1e4 > [162980.035699] CPU: 0 PID: 2777 Comm: malloc Tainted: G W       4.14.6-s > 3k-dev-ga8e8e8b176-svn9134 #85 > [162980.035744] task: c67e2c00 task.stack: c668e000 > [162980.035783] NIP:  c000fe18 LR: c00e1eec CTR: c00f90c0 > [162980.035830] REGS: c668fc20 TRAP: 0700   Tainted: G W        (4.14.6-s > 3k-dev-ga8e8e8b176-svn9134) > [162980.035854] MSR:  00029032   CR: 24044224 XER: 20000000 > [162980.036003] > [162980.036003] GPR00: c00e1eec c668fcd0 c67e2c00 00000010 c6869410 > 10080000 000 > 00000 77fb4000 > [162980.036003] GPR08: ffff0001 0683c001 00000000 ffffff80 44028228 > 10018a34 000 > 04008 418004fc > [162980.036003] GPR16: c668e000 00040100 c668e000 c06c0000 c668fe78 > c668e000 c68 > 35ba0 c668fd48 > [162980.036003] GPR24: 00000000 73ffffff 74000000 00000001 77fb4000 > 100fffff 101 > 00000 10100000 > [162980.036743] NIP [c000fe18] hugetlb_free_pgd_range+0xc8/0x1e4 > [162980.036839] LR [c00e1eec] free_pgtables+0x12c/0x150 > [162980.036861] Call Trace: > [162980.036939] [c668fcd0] [c00f0774] unlink_anon_vmas+0x1c4/0x214 > (unreliable) > [162980.037040] [c668fd10] [c00e1eec] free_pgtables+0x12c/0x150 > [162980.037118] [c668fd40] [c00eabac] exit_mmap+0xe8/0x1b4 > [162980.037210] [c668fda0] [c0019710] mmput.part.9+0x20/0xd8 > [162980.037301] [c668fdb0] [c001ecb0] do_exit+0x1f0/0x93c > [162980.037386] [c668fe00] [c001f478] do_group_exit+0x40/0xcc > [162980.037479] [c668fe10] [c002a76c] get_signal+0x47c/0x614 > [162980.037570] [c668fe70] [c0007840] do_signal+0x54/0x244 > [162980.037654] [c668ff30] [c0007ae8] do_notify_resume+0x34/0x88 > [162980.037744] [c668ff40] [c000dae8] do_user_signal+0x74/0xc4 > [162980.037781] Instruction dump: > [162980.037821] 7fdff378 81370000 54a3463a 80890020 7d24182e 7c841a14 > 712a0004 4 > 082ff94 > [162980.038014] 2f890000 419e0010 712a0ff0 408200e0 <0fe00000> 54a9000a > 7f984840 >  419d0094 > [162980.038216] ---[ end trace c0ceeca8e7a5800a ]--- > [162980.038754] BUG: non-zero nr_ptes on freeing mm: 1 > [162985.363322] BUG: non-zero nr_ptes on freeing mm: -1 > > Christophe