From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f52.google.com (mail-wm0-f52.google.com [74.125.82.52]) by kanga.kvack.org (Postfix) with ESMTP id 6E4DB6B0009 for ; Sat, 30 Jan 2016 12:58:34 -0500 (EST) Received: by mail-wm0-f52.google.com with SMTP id l66so19685651wml.0 for ; Sat, 30 Jan 2016 09:58:34 -0800 (PST) Received: from arcturus.aphlor.org (arcturus.ipv6.aphlor.org. [2a03:9800:10:4a::2]) by mx.google.com with ESMTPS id y41si4333228wmh.107.2016.01.30.09.58.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 30 Jan 2016 09:58:33 -0800 (PST) Date: Sat, 30 Jan 2016 12:58:31 -0500 From: Dave Jones Subject: 4.5-rc1: mm/gup.c warning when writing to /proc/self/mem Message-ID: <20160130175831.GA30571@codemonkey.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Linux Kernel Hit this overnight. Just started seeing this after I added "create mmap's of fd's we open()'d" to trinity. Dave WARNING: CPU: 1 PID: 16733 at mm/gup.c:434 __get_user_pages+0x5f9/0x990() CPU: 1 PID: 16733 Comm: trinity-c30 Tainted: G W 4.5.0-rc1-think+ #12 0000000000000009 000000006648ff5c ffff88000f0779a0 ffffffff99565971 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 16731 at mm/gup.c:434 __get_user_pages+0x5f9/0x990() 0000000000000000 ffff88000f0779e0 ffffffff990b168f ffffffff992aba69 ffff880450cf1000 0000000000000000 ffff88023780e600 0000000000000017 Call Trace: [] dump_stack+0x4e/0x7d [] warn_slowpath_common+0x9f/0xe0 [] ? __get_user_pages+0x5f9/0x990 [] warn_slowpath_null+0x1a/0x20 [] __get_user_pages+0x5f9/0x990 [] ? follow_page_mask+0x530/0x530 [] ? __access_remote_vm+0xca/0x340 [] get_user_pages+0x52/0x60 [] __access_remote_vm+0x190/0x340 [] ? preempt_count_sub+0xc1/0x120 [] ? __might_fault+0xf0/0xf0 [] ? __might_fault+0x87/0xf0 [] access_remote_vm+0x1f/0x30 [] mem_rw.isra.15+0xe3/0x1d0 [] mem_write+0x43/0x50 [] __vfs_write+0xdd/0x260 [] ? __vfs_read+0x260/0x260 [] ? mutex_lock_nested+0x38b/0x590 [] ? __lock_is_held+0x92/0xd0 [] ? preempt_count_sub+0xc1/0x120 [] ? update_fast_ctr+0x65/0x90 [] ? percpu_down_read+0x57/0xa0 [] ? __sb_start_write+0xb4/0xf0 [] vfs_write+0xf6/0x260 [] SyS_write+0xbf/0x160 [] ? SyS_read+0x160/0x160 [] ? trace_hardirqs_on_thunk+0x17/0x19 [] entry_SYSCALL_64_fastpath+0x12/0x6b CPU: 0 PID: 16731 Comm: trinity-c28 Tainted: G W 4.5.0-rc1-think+ #12 0000000000000009 000000002962eec9 ffff8802e7b7f8d8 ffffffff99565971 0000000000000000 ffff8802e7b7f918 ffffffff990b168f ffffffff992aba69 ffff8803ed6f1000 00000000000000a0 ffff88023780e600 0000000000000017 Call Trace: [] dump_stack+0x4e/0x7d [] warn_slowpath_common+0x9f/0xe0 [] ? __get_user_pages+0x5f9/0x990 [] warn_slowpath_null+0x1a/0x20 [] __get_user_pages+0x5f9/0x990 [] ? native_sched_clock+0x69/0x160 [] ? follow_page_mask+0x530/0x530 [] ? __access_remote_vm+0xca/0x340 [] get_user_pages+0x52/0x60 [] __access_remote_vm+0x190/0x340 [] ? preempt_count_sub+0xc1/0x120 [] ? __might_fault+0xf0/0xf0 [] ? __might_fault+0x87/0xf0 [] access_remote_vm+0x1f/0x30 [] mem_rw.isra.15+0xe3/0x1d0 [] mem_write+0x43/0x50 [] do_loop_readv_writev+0xe0/0x110 [] ? mem_rw.isra.15+0x1d0/0x1d0 [] do_readv_writev+0x38b/0x3c0 [] ? trace_hardirqs_off_caller+0x70/0x110 [] ? mem_rw.isra.15+0x1d0/0x1d0 [] ? vfs_write+0x260/0x260 [] ? debug_smp_processor_id+0x17/0x20 [] ? preempt_count_sub+0xc1/0x120 [] ? __lock_is_held+0x25/0xd0 [] ? mark_held_locks+0x23/0xc0 [] ? context_tracking_exit.part.5+0x2a/0x50 [] ? trace_hardirqs_on_caller+0x186/0x280 [] ? trace_hardirqs_on+0xd/0x10 [] vfs_writev+0x59/0x70 [] SyS_pwritev+0x15d/0x180 [] ? SyS_preadv+0x180/0x180 [] ? trace_hardirqs_on_thunk+0x17/0x19 [] entry_SYSCALL_64_fastpath+0x12/0x6b ---[ end trace 96115a52264cceaf ]--- ---[ end trace 96115a52264cceb0 ]--- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org