Messages in this thread | | | Date | Mon, 23 Apr 2018 01:24:02 -0700 | Subject | WARNING: suspicious RCU usage in rt6_check_expired | From | syzbot <> |
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Hello,
syzbot hit the following crash on net-next commit 0638eb573cde5888c0886c7f35da604e5db209a6 (Sat Apr 21 20:06:14 2018 +0000) Merge branch 'ipv6-Another-followup-to-the-fib6_info-change' syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=2422c9e35796659d2273
So far this crash happened 3 times on net-next. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6081013801287680 Kernel config: https://syzkaller.appspot.com/x/.config?id=-8412024688694752032 compiler: gcc (GCC) 8.0.1 20180413 (experimental)
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2422c9e35796659d2273@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.
netlink: 'syz-executor4': attribute type 6 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 6 has an invalid length.
============================= WARNING: suspicious RCU usage 4.16.0+ #11 Not tainted ----------------------------- net/ipv6/route.c:410 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor7/25958: #0: 00000000d1963139 (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1469 [inline] #0: 00000000d1963139 (sk_lock-AF_INET6){+.+.}, at: sock_setsockopt+0x19c/0x1fe0 net/core/sock.c:717
stack backtrace: CPU: 1 PID: 25958 Comm: syz-executor7 Not tainted 4.16.0+ #11 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+0x1b9/0x294 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592 rt6_check_expired+0x38b/0x3e0 net/ipv6/route.c:410 ip6_negative_advice+0x67/0xc0 net/ipv6/route.c:2204 dst_negative_advice include/net/sock.h:1786 [inline] sock_setsockopt+0x138f/0x1fe0 net/core/sock.c:1051 __sys_setsockopt+0x2df/0x390 net/socket.c:1899 SYSC_setsockopt net/socket.c:1914 [inline] SyS_setsockopt+0x34/0x50 net/socket.c:1911 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455389 RSP: 002b:00007f7556e30c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f7556e316d4 RCX: 0000000000455389 RDX: 0000000000000035 RSI: 0000000000000001 RDI: 0000000000000013 RBP: 000000000072bf58 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005ff R14: 00000000006fc088 R15: 0000000000000001 netlink: 'syz-executor4': attribute type 4 has an invalid length. netlink: 'syz-executor4': attribute type 4 has an invalid length. IPVS: set_ctl: invalid protocol: 59 127.0.0.1:20000 lc IPVS: set_ctl: invalid protocol: 127 224.0.0.1:20000 rr IPVS: sync thread started: state = BACKUP, mcast_ifn = ip6tnl0, syncid = 4, id = 0 IPVS: set_ctl: invalid protocol: 127 224.0.0.1:20000 rr netlink: 72 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 72 bytes leftover after parsing attributes in process `syz-executor2'. dccp_xmit_packet: Payload too large (65423) for featneg. IPVS: set_ctl: invalid protocol: 29 1.0.0.0:2 wlc IPVS: set_ctl: invalid protocol: 29 1.0.0.0:2 wlc netlink: 32 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor1': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. IPVS: set_ctl: invalid protocol: 108 224.0.0.1:20004 lblc netlink: 'syz-executor1': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. IPVS: set_ctl: invalid protocol: 108 224.0.0.1:20004 lblc
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