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[209.85.220.69]) by mx.google.com with SMTPS id k184sor17154606itb.31.2019.05.07.02.47.07 for (Google Transport Security); Tue, 07 May 2019 02:47:08 -0700 (PDT) Received-SPF: pass (google.com: domain of 3gltrxakbapmntufvggzmvkkdy.bjjbgzpnzmxjiozio.xjh@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3gltrxakbapmntufvggzmvkkdy.bjjbgzpnzmxjiozio.xjh@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3GlTRXAkbAPMntufVggZmVkkdY.bjjbgZpnZmXjioZio.Xjh@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: APXvYqynaCrllFXrpp1849mgB2TbZ4GJFpRB0hRhSDplz6oKeuFXJK5LMjhEjVn6h7AArynXyEBMKUgEIVL7hMl+7Gw5ZvxClu/T MIME-Version: 1.0 X-Received: by 2002:a24:fc46:: with SMTP id b67mr21307311ith.4.1557222426279; Tue, 07 May 2019 02:47:06 -0700 (PDT) Date: Tue, 07 May 2019 02:47:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008e076b0588491997@google.com> Subject: KASAN: use-after-free Read in page_get_anon_vma From: syzbot To: akpm@linux-foundation.org, borntraeger@de.ibm.com, hughd@google.com, jglisse@redhat.com, kirill.shutemov@linux.intel.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mike.kravetz@oracle.com, n-horiguchi@ah.jp.nec.com, sean.j.christopherson@intel.com, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: Hello, syzbot found the following crash on: HEAD commit: 771acc7e Bluetooth: btusb: request wake pin with NOAUTOEN git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15ac0abf200000 kernel config: https://syzkaller.appspot.com/x/.config?x=4fb64439e07a1ec0 dashboard link: https://syzkaller.appspot.com/bug?extid=6a309df008e9bd6f5075 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6a309df008e9bd6f5075@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: use-after-free in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: use-after-free in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: use-after-free in page_get_anon_vma+0x24b/0x4b0 mm/rmap.c:477 Read of size 4 at addr ffff88809f2398f0 by task kswapd0/1553 CPU: 0 PID: 1553 Comm: kswapd0 Not tainted 5.1.0-rc4+ #61 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:102 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] page_get_anon_vma+0x24b/0x4b0 mm/rmap.c:477 split_huge_page_to_list+0x58a/0x2de0 mm/huge_memory.c:2675 split_huge_page include/linux/huge_mm.h:148 [inline] deferred_split_scan+0x64b/0xa60 mm/huge_memory.c:2853 do_shrink_slab+0x400/0xa80 mm/vmscan.c:551 shrink_slab mm/vmscan.c:700 [inline] shrink_slab+0x4be/0x5e0 mm/vmscan.c:680 shrink_node+0x552/0x1570 mm/vmscan.c:2724 kswapd_shrink_node mm/vmscan.c:3482 [inline] balance_pgdat+0x56c/0xe80 mm/vmscan.c:3640 kswapd+0x615/0x1010 mm/vmscan.c:3895 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 11425: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3394 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3556 kmem_cache_zalloc include/linux/slab.h:732 [inline] __alloc_file+0x27/0x300 fs/file_table.c:100 alloc_empty_file+0x72/0x170 fs/file_table.c:150 path_openat+0xef/0x46e0 fs/namei.c:3522 do_filp_open+0x1a1/0x280 fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 fs/open.c:1069 __do_sys_open fs/open.c:1087 [inline] __se_sys_open fs/open.c:1082 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1082 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11435: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3500 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3766 file_free_rcu+0x98/0xe0 fs/file_table.c:49 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x928/0x1390 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff88809f2397c0 which belongs to the cache filp of size 456 The buggy address is located 304 bytes inside of 456-byte region [ffff88809f2397c0, ffff88809f239988) The buggy address belongs to the page: page:ffffea00027c8e40 count:1 mapcount:0 mapping:ffff88821bc45380 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00025571c8 ffffea000235d288 ffff88821bc45380 raw: 0000000000000000 ffff88809f239040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f239780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88809f239800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88809f239880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809f239900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f239980: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.