From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18883C433DB for ; Thu, 25 Feb 2021 16:50:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DEAA364EDB for ; Thu, 25 Feb 2021 16:50:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233603AbhBYQuB (ORCPT ); Thu, 25 Feb 2021 11:50:01 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:39859 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a05:6638:189:: with SMTP id a9mr3512182jaq.22.1614271643076; Thu, 25 Feb 2021 08:47:23 -0800 (PST) Date: Thu, 25 Feb 2021 08:47:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000db4fe805bc2be7fc@google.com> Subject: KASAN: use-after-free Read in try_to_wake_up From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, christian@brauner.io, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 577c2835 Add linux-next specific files for 20210224 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1586e0dad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e9bb3d369b3bf49 dashboard link: https://syzkaller.appspot.com/bug?extid=7bf785eedca35ca05501 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16609646d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1529c5a8d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7bf785eedca35ca05501@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 Read of size 8 at addr ffff888030dc08d0 by task syz-executor199/9383 CPU: 1 PID: 9383 Comm: syz-executor199 Not tainted 5.11.0-next-20210224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 try_to_wake_up+0x98/0x14a0 kernel/sched/core.c:3347 io_wq_destroy+0x74/0x3d0 fs/io-wq.c:1013 __io_uring_files_cancel+0x195/0x230 fs/io_uring.c:8810 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43e989 Code: 00 49 c7 c0 c0 ff ff ff be e7 00 00 00 ba 3c 00 00 00 eb 12 0f 1f 44 00 00 89 d0 0f 05 48 3d 00 f0 ff ff 77 1c f4 89 f0 0f 05 <48> 3d 00 f0 ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 RSP: 002b:00007ffe3a2de828 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043e989 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000010000000 R10: 0000000000008011 R11: 0000000000000246 R12: 00000000004b02f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 9383: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] __kasan_slab_alloc+0x75/0x90 mm/kasan/common.c:460 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] kmem_cache_alloc_node+0x16d/0x3c0 mm/slub.c:2943 alloc_task_struct_node kernel/fork.c:170 [inline] dup_task_struct kernel/fork.c:860 [inline] copy_process+0x613/0x6fd0 kernel/fork.c:1940 kernel_clone+0xe7/0xab0 kernel/fork.c:2462 io_wq_fork_thread+0xa7/0xe0 fs/io-wq.c:601 io_wq_create+0x81c/0xab0 fs/io-wq.c:985 io_init_wq_offload fs/io_uring.c:7779 [inline] io_uring_alloc_task_context+0x185/0x510 fs/io_uring.c:7798 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8737 io_uring_install_fd fs/io_uring.c:9336 [inline] io_uring_create fs/io_uring.c:9487 [inline] io_uring_setup+0x14c7/0x2c20 fs/io_uring.c:9526 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 12: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8b/0x730 mm/slub.c:3177 __put_task_struct+0x267/0x3f0 kernel/fork.c:742 put_task_struct include/linux/sched/task.h:111 [inline] delayed_put_task_struct+0x1f6/0x340 kernel/exit.c:173 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0x722/0x1280 kernel/rcu/tree.c:2794 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x700 kernel/rcu/tree.c:3114 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:179 context_switch kernel/sched/core.c:4327 [inline] __schedule+0x914/0x21a0 kernel/sched/core.c:5075 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5235 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x46/0x50 kernel/locking/spinlock.c:191 io_wq_manager+0x13c/0x5b0 fs/io-wq.c:715 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff888030dc0000 which belongs to the cache task_struct of size 6912 The buggy address is located 2256 bytes inside of 6912-byte region [ffff888030dc0000, ffff888030dc1b00) The buggy address belongs to the page: page:00000000deb921bd refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x30dc0 head:00000000deb921bd order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888140004000 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888030dc0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888030dc0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888030dc0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888030dc0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888030dc0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches