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[209.132.180.67]) by mx.google.com with ESMTP id z129si38017702pfz.13.2018.12.30.19.41.52; Sun, 30 Dec 2018 19:42:08 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726941AbeLaDlG (ORCPT + 99 others); Sun, 30 Dec 2018 22:41:06 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:51439 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725935AbeLaDlF (ORCPT ); Sun, 30 Dec 2018 22:41:05 -0500 Received: by mail-io1-f70.google.com with SMTP id q207so28463075iod.18 for ; Sun, 30 Dec 2018 19:41:05 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=86AMUuzbwPhOMbCH6aZm3cGDKGCVuTQXSdj4gflnNT4=; b=iiliPF6ivGoTPD+ca3au8zxcjV4XJrvj0ki5gVdE6l3H31ysz94mxoK1vCqggbzm59 +Qx9Nnq8SY21ONoLNbGeTwDAjwXBNd2EKi0TztSzA4SrZ9jl2DtRnpytidVMTyloYTWk ZyFKQegIN5OjHuNS4cOUEtrWSc2B4AJo/ok8DkoiXODlt1ttaDCMv17hK4FbU/x8EwCC FLkaI4OtA3dK+tn4a0EoG5oAf7mR/XcCTmknFRt96WaYy5f14S3B6Xg2MTnk2HhMMKdV vUunlCQ4wx8XwulAtRJ5EdR0LXda7NjWOK2a2x24D2O3Cq8YgVz+e4pexdekRbLB+HbI 5Hpg== X-Gm-Message-State: AA+aEWZwfBZfOq82jZiP4glyqQDWQqZo4KnU8PAj4Do72LoRAvaAj6VY yQMBEKVB9hPHVDESAQQYpkUaXNbH8Zyz5ewqf8xkL943SDlu MIME-Version: 1.0 X-Received: by 2002:a02:8ca9:: with SMTP id f38mr28307294jak.14.1546227664572; Sun, 30 Dec 2018 19:41:04 -0800 (PST) Date: Sun, 30 Dec 2018 19:41:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b05d0c057e492e33@google.com> Subject: kernel panic: corrupted stack end in wb_workfn From: syzbot To: akpm@linux-foundation.org, aryabinin@virtuozzo.com, guro@fb.com, hannes@cmpxchg.org, jbacik@fb.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mgorman@techsingularity.net, mhocko@suse.com, shakeelb@google.com, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 195303136f19 Merge tag 'kconfig-v4.21-2' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=176c0ebf400000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7 dashboard link: https://syzkaller.appspot.com/bug?extid=ec1b7575afef85a0e5ca compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a9a84b400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17199bb3400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ec1b7575afef85a0e5ca@syzkaller.appspotmail.com Kernel panic - not syncing: corrupted stack end detected inside scheduler CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0+ #396 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 panic+0x2ad/0x55f kernel/panic.c:189 schedule_debug kernel/sched/core.c:3285 [inline] __schedule+0x1ec6/0x1ed0 kernel/sched/core.c:3394 preempt_schedule_common+0x1f/0xe0 kernel/sched/core.c:3596 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3622 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] __remove_mapping+0x932/0x1af0 mm/vmscan.c:967 shrink_page_list+0x6610/0xc2e0 mm/vmscan.c:1461 shrink_inactive_list+0x77b/0x1c60 mm/vmscan.c:1961 shrink_list mm/vmscan.c:2273 [inline] shrink_node_memcg+0x7a8/0x19a0 mm/vmscan.c:2538 shrink_node+0x3e1/0x17f0 mm/vmscan.c:2753 shrink_zones mm/vmscan.c:2987 [inline] do_try_to_free_pages+0x3df/0x12a0 mm/vmscan.c:3049 try_to_free_pages+0x4d0/0xb90 mm/vmscan.c:3265 __perform_reclaim mm/page_alloc.c:3920 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3942 [inline] __alloc_pages_slowpath+0xa5a/0x2db0 mm/page_alloc.c:4335 __alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549 alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106 alloc_pages include/linux/gfp.h:509 [inline] __page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924 pagecache_get_page+0x396/0xf00 mm/filemap.c:1615 find_or_create_page include/linux/pagemap.h:322 [inline] ext4_mb_load_buddy_gfp+0xddf/0x1e70 fs/ext4/mballoc.c:1158 ext4_mb_load_buddy fs/ext4/mballoc.c:1241 [inline] ext4_mb_regular_allocator+0x634/0x1590 fs/ext4/mballoc.c:2190 ext4_mb_new_blocks+0x1de3/0x4840 fs/ext4/mballoc.c:4538 ext4_ext_map_blocks+0x2eef/0x6180 fs/ext4/extents.c:4404 ext4_map_blocks+0x8f7/0x1b60 fs/ext4/inode.c:636 mpage_map_one_extent fs/ext4/inode.c:2480 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2533 [inline] ext4_writepages+0x2564/0x4170 fs/ext4/inode.c:2884 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335 __writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758 oom_reaper: reaped process 7963 (syz-executor189), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB rsyslogd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 wb_check_start_all fs/fs-writeback.c:1882 [inline] wb_do_writeback fs/fs-writeback.c:1908 [inline] wb_workfn+0xee9/0x1790 fs/fs-writeback.c:1942 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 CPU: 1 PID: 7840 Comm: rsyslogd Not tainted 4.20.0+ #396 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+0x1d3/0x2c6 lib/dump_stack.c:113 dump_header+0x253/0x1239 mm/oom_kill.c:451 oom_kill_process.cold.27+0x10/0x903 mm/oom_kill.c:966 out_of_memory+0x8ba/0x1480 mm/oom_kill.c:1133 __alloc_pages_may_oom mm/page_alloc.c:3666 [inline] __alloc_pages_slowpath+0x230c/0x2db0 mm/page_alloc.c:4379 __alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549 alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106 alloc_pages include/linux/gfp.h:509 [inline] __page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924 page_cache_read mm/filemap.c:2373 [inline] filemap_fault+0x1595/0x25f0 mm/filemap.c:2557 ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6317 __do_fault+0x100/0x6b0 mm/memory.c:2997 do_read_fault mm/memory.c:3409 [inline] do_fault mm/memory.c:3535 [inline] handle_pte_fault mm/memory.c:3766 [inline] __handle_mm_fault+0x392f/0x5630 mm/memory.c:3890 handle_mm_fault+0x54f/0xc70 mm/memory.c:3927 do_user_addr_fault arch/x86/mm/fault.c:1475 [inline] __do_page_fault+0x5f6/0xd70 arch/x86/mm/fault.c:1541 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0033:0x7f00f990e1fd Code: Bad RIP value. RSP: 002b:00007f00f6eade30 EFLAGS: 00010293 RAX: 0000000000000fd2 RBX: 000000000111f170 RCX: 00007f00f990e1fd RDX: 0000000000000fff RSI: 00007f00f86e25a0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 000000000110a260 R09: 0000000000000000 R10: 74616c7567657227 R11: 0000000000000293 R12: 000000000065e420 R13: 00007f00f6eae9c0 R14: 00007f00f9f53040 R15: 0000000000000003 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches