From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: BUG: corrupted list in rdma_listen Date: Thu, 19 Apr 2018 09:08:01 -0700 Message-ID: <000000000000a366e2056a35c6fd@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Return-path: Sender: linux-kernel-owner@vger.kernel.org To: dasaratharaman.chandramouli@intel.com, dledford@redhat.com, jgg@ziepe.ca, leonro@mellanox.com, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, markb@mellanox.com, monis@mellanox.com, parav@mellanox.com, syzkaller-bugs@googlegroups.com List-Id: linux-rdma@vger.kernel.org Hello, syzbot hit the following crash on upstream commit bcfc1f4554662d8f2429ac8bd96064a59c149754 (Sat Mar 24 16:50:12 2018 +0000) Merge tag 'pinctrl-v4.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=8458d13b13562abf6b77 So far this crash happened 3 times on upstream. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5502346817699840 Kernel config: https://syzkaller.appspot.com/x/.config?id=-5034017172441945317 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8458d13b13562abf6b77@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. list_add corruption. prev->next should be next (00000000bbe7894a), but was (null). (prev=0000000053f15260). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:28! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 31373 Comm: syz-executor1 Not tainted 4.16.0-rc6+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid+0x8f/0xd0 lib/list_debug.c:26 RSP: 0018:ffff880188f87970 EFLAGS: 00010282 RAX: 0000000000000075 RBX: ffffffff87449fe0 RCX: 0000000000000000 RDX: 0000000000000075 RSI: ffffc900075c8000 RDI: ffffed00311f0f22 RBP: ffff880188f87988 R08: 1ffff100311f0e7a R09: 0000000000000000 R10: ffff880188f87988 R11: 0000000000000000 R12: ffff88018c479898 R13: ffff88018c479898 R14: ffff8801d94baad8 R15: 0000000000000400 FS: 00007f755bcca700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000725934 CR3: 00000001872ec001 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2309 [inline] rdma_listen+0x581/0x8e0 drivers/infiniband/core/cma.c:3333 ucma_listen+0x172/0x1f0 drivers/infiniband/core/ucma.c:1074 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454879 RSP: 002b:00007f755bcc9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f755bcca6d4 RCX: 0000000000454879 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000683 R14: 00000000006face8 R15: 0000000000000000 Code: 00 00 00 5b 41 5c 5d c3 48 89 d9 48 c7 c7 60 7e 40 86 e8 ad e0 fb fe 0f 0b 48 89 f1 48 c7 c7 20 7f 40 86 48 89 de e8 99 e0 fb fe <0f> 0b 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 a0 7f 40 86 e8 82 e0 RIP: __list_add_valid+0x8f/0xd0 lib/list_debug.c:26 RSP: ffff880188f87970 ---[ end trace fe3987c6813eeb9c ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.