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Date: Sat, 01 Sep 2018 22:11:03 -0700 From: syzbot <syzbot+e93a2c41f91b8e2c7d9b@...kaller.appspotmail.com> To: davem@...emloft.net, jon.maloy@...csson.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com Subject: general protection fault in rhashtable_walk_start_check Hello, syzbot found the following crash on: HEAD commit: f611a5b4a51f ibmvnic: Include missing return code checks i.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=15ecaa46400000 kernel config: https://syzkaller.appspot.com/x/.config?x=531a917630d2a492 dashboard link: https://syzkaller.appspot.com/bug?extid=e93a2c41f91b8e2c7d9b compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15cb3cb2400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12d56e3e400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e93a2c41f91b8e2c7d9b@...kaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN CPU: 0 PID: 4663 Comm: syz-executor272 Not tainted 4.19.0-rc1+ #78 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rhashtable_walk_start_check+0xd3/0x1400 lib/rhashtable.c:717 Code: f2 c7 40 30 f2 f2 f2 f2 c7 40 34 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 94 9e 0b fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 a4 0f 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b RSP: 0018:ffff8801ba726ee8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff852abf68 RDX: 0000000000000000 RSI: ffffffff837121ec RDI: 0000000000000000 RBP: ffff8801ba727130 R08: ffff8801ba750780 R09: ffffed00374fcf3c R10: ffffed00374fcf3c R11: ffff8801ba7e79e3 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801ba727270 R15: fffffffffffff000 FS: 0000000001b0b880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000100 CR3: 00000001bbf40000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rhashtable_walk_start include/linux/rhashtable.h:244 [inline] tipc_nl_sk_walk+0x52/0x1d0 net/tipc/socket.c:3236 tipc_nl_sk_dump+0x24/0x30 net/tipc/socket.c:3366 __tipc_nl_compat_dumpit.isra.11+0x20b/0xad0 net/tipc/netlink_compat.c:192 tipc_nl_compat_dumpit+0x1f4/0x440 net/tipc/netlink_compat.c:265 tipc_nl_compat_handle net/tipc/netlink_compat.c:1142 [inline] tipc_nl_compat_recv+0x12b3/0x19a0 net/tipc/netlink_compat.c:1205 genl_family_rcv_msg+0x8a3/0x1140 net/netlink/genetlink.c:601 genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454 genl_rcv+0x28/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2114 __sys_sendmsg+0x11d/0x290 net/socket.c:2152 __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg net/socket.c:2159 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4400e9 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:00007ffe84ec3538 EFLAGS: 00000213 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401970 R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace c8a9aaea5d0de646 ]--- RIP: 0010:rhashtable_walk_start_check+0xd3/0x1400 lib/rhashtable.c:717 Code: f2 c7 40 30 f2 f2 f2 f2 c7 40 34 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 94 9e 0b fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 a4 0f 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b RSP: 0018:ffff8801ba726ee8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff852abf68 RDX: 0000000000000000 RSI: ffffffff837121ec RDI: 0000000000000000 RBP: ffff8801ba727130 R08: ffff8801ba750780 R09: ffffed00374fcf3c R10: ffffed00374fcf3c R11: ffff8801ba7e79e3 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801ba727270 R15: fffffffffffff000 FS: 0000000001b0b880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000100 CR3: 00000001bbf40000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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@...glegroups.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
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