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[209.85.220.69]) by mx.google.com with SMTPS id s2sor4671689ios.38.2019.06.05.11.42.08 for (Google Transport Security); Wed, 05 Jun 2019 11:42:08 -0700 (PDT) Received-SPF: pass (google.com: domain of 3_wz4xakbaoyaghsittmzixxql.owwotmcamzkwvbmvb.kwu@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 3_wz4xakbaoyaghsittmzixxql.owwotmcamzkwvbmvb.kwu@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3_wz4XAkbAOYaghSITTMZIXXQL.OWWOTMcaMZKWVbMVb.KWU@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: APXvYqyQSToVWrtyBHNgFhFwGOm5JXoKFHnoYyxvEB9G9+8LsxYuPtrQVn8OefRIrXAsQWOuxHoYjg0+w1iLcvYseLENP3looVku MIME-Version: 1.0 X-Received: by 2002:a5d:958d:: with SMTP id a13mr17604654ioo.288.1559760127802; Wed, 05 Jun 2019 11:42:07 -0700 (PDT) Date: Wed, 05 Jun 2019 11:42:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005a4b99058a97f42e@google.com> Subject: KASAN: use-after-free Read in unregister_shrinker From: syzbot To: akpm@linux-foundation.org, bfields@fieldses.org, bfields@redhat.com, chris@chrisdown.name, daniel.m.jordan@oracle.com, guro@fb.com, hannes@cmpxchg.org, jlayton@kernel.org, ktkhai@virtuozzo.com, laoar.shao@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org, mgorman@techsingularity.net, mhocko@suse.com, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com, yang.shi@linux.alibaba.com 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: b2924447 Add linux-next specific files for 20190605 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17e867eea00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4248d6bc70076f7d dashboard link: https://syzkaller.appspot.com/bug?extid=83a43746cebef3508b49 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1122965aa00000 The bug was bisected to: commit db17b61765c2c63b9552d316551550557ff0fcfd Author: J. Bruce Fields Date: Fri May 17 13:03:38 2019 +0000 nfsd4: drc containerization bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=110cd22ea00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=130cd22ea00000 console output: https://syzkaller.appspot.com/x/log.txt?x=150cd22ea00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+83a43746cebef3508b49@syzkaller.appspotmail.com Fixes: db17b61765c2 ("nfsd4: drc containerization") ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 Read of size 8 at addr ffff88808a5bd128 by task syz-executor.2/12471 CPU: 0 PID: 12471 Comm: syz-executor.2 Not tainted 5.2.0-rc3-next-20190605 #9 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+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __list_del_entry_valid+0xe6/0xf5 lib/list_debug.c:51 __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] unregister_shrinker+0xb2/0x2e0 mm/vmscan.c:443 nfsd_reply_cache_shutdown+0x26/0x360 fs/nfsd/nfscache.c:194 nfsd_exit_net+0x170/0x4b0 fs/nfsd/nfsctl.c:1272 ops_exit_list.isra.0+0xaa/0x150 net/core/net_namespace.c:154 setup_net+0x400/0x740 net/core/net_namespace.c:333 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x444/0x980 kernel/fork.c:2718 __do_sys_unshare kernel/fork.c:2786 [inline] __se_sys_unshare kernel/fork.c:2784 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2784 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7ae73e1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ae73e26d4 R13: 00000000004c84ef R14: 00000000004decb0 R15: 00000000ffffffff Allocated by task 12460: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3663 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:742 [inline] ops_init+0xff/0x410 net/core/net_namespace.c:120 setup_net+0x2d3/0x740 net/core/net_namespace.c:316 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x444/0x980 kernel/fork.c:2718 __do_sys_unshare kernel/fork.c:2786 [inline] __se_sys_unshare kernel/fork.c:2784 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2784 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 12460: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3426 [inline] kfree+0x106/0x2a0 mm/slab.c:3753 ops_init+0xd1/0x410 net/core/net_namespace.c:135 setup_net+0x2d3/0x740 net/core/net_namespace.c:316 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x444/0x980 kernel/fork.c:2718 __do_sys_unshare kernel/fork.c:2786 [inline] __se_sys_unshare kernel/fork.c:2784 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2784 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808a5bcdc0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 872 bytes inside of 1024-byte region [ffff88808a5bcdc0, ffff88808a5bd1c0) The buggy address belongs to the page: page:ffffea0002296f00 refcount:1 mapcount:0 mapping:ffff8880aa400ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000249ea08 ffffea000235a588 ffff8880aa400ac0 raw: 0000000000000000 ffff88808a5bc040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808a5bd000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808a5bd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808a5bd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808a5bd180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88808a5bd200: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches