From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f200.google.com ([209.85.166.200]:59900 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727482AbeJBSZ4 (ORCPT ); Tue, 2 Oct 2018 14:25:56 -0400 Received: by mail-it1-f200.google.com with SMTP id e197-v6so2861192ita.9 for ; Tue, 02 Oct 2018 04:43:03 -0700 (PDT) MIME-Version: 1.0 Date: Tue, 02 Oct 2018 04:43:02 -0700 In-Reply-To: <000000000000f7af8605773cc09f@google.com> Message-ID: <000000000000a4360105773d6c8b@google.com> Subject: Re: general protection fault in fuse_dev_do_write From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: syzbot has found a reproducer for the following crash on: HEAD commit: 62f3d25900c9 Add linux-next specific files for 20181002 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16e2a94e400000 kernel config: https://syzkaller.appspot.com/x/.config?x=77a6dfae97d4b496 dashboard link: https://syzkaller.appspot.com/bug?extid=c1e36d30ee3416289cc0 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b46781400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a54b81400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c1e36d30ee3416289cc0@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6059 Comm: syz-executor343 Not tainted 4.19.0-rc6-next-20181002+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fuse_retrieve fs/fuse/dev.c:1741 [inline] RIP: 0010:fuse_notify_retrieve fs/fuse/dev.c:1801 [inline] RIP: 0010:fuse_notify fs/fuse/dev.c:1834 [inline] RIP: 0010:fuse_dev_do_write+0x1dc2/0x3810 fs/fuse/dev.c:1913 Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 dc 17 00 00 49 8b 9d 58 01 00 00 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82 RSP: 0018:ffff8801bb6ff4b8 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8287fbc1 RDX: 0000000000000000 RSI: ffffffff8287fbd3 RDI: 0000000000000004 RBP: ffff8801bb6ffa50 R08: ffff8801bb5d4500 R09: ffffed003a915b7e R10: ffffed003a915b7e R11: ffff8801d48adbf3 R12: 0000000000000000 R13: ffff8801d48adbd0 R14: 0000000000000000 R15: 0000000000000030 FS: 0000000002337880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455080 CR3: 00000001d3b53000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fuse_dev_write+0x19a/0x240 fs/fuse/dev.c:1997 call_write_iter include/linux/fs.h:1844 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440299 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffef8f938a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 RDX: 0000000000000030 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401b20 R13: 0000000000401bb0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 6ca075609cbc5a19 ]--- RIP: 0010:fuse_retrieve fs/fuse/dev.c:1741 [inline] RIP: 0010:fuse_notify_retrieve fs/fuse/dev.c:1801 [inline] RIP: 0010:fuse_notify fs/fuse/dev.c:1834 [inline] RIP: 0010:fuse_dev_do_write+0x1dc2/0x3810 fs/fuse/dev.c:1913 Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 dc 17 00 00 49 8b 9d 58 01 00 00 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82 RSP: 0018:ffff8801bb6ff4b8 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8287fbc1 RDX: 0000000000000000 RSI: ffffffff8287fbd3 RDI: 0000000000000004 RBP: ffff8801bb6ffa50 R08: ffff8801bb5d4500 R09: ffffed003a915b7e R10: ffffed003a915b7e R11: ffff8801d48adbf3 R12: 0000000000000000 R13: ffff8801d48adbd0 R14: 0000000000000000 R15: 0000000000000030 FS: 0000000002337880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455080 CR3: 00000001d3b53000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400