Messages in this thread | | | Subject | Re: WARNING: suspicious RCU usage in rt6_check_expired | From | Eric Dumazet <> | Date | Mon, 23 Apr 2018 06:31:19 -0700 |
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On 04/23/2018 01:24 AM, syzbot wrote: > 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 > > > --- > 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.
Added in commit a68886a691804d3f6d479ebf6825480fbafb6a00 ("net/ipv6: Make from in rt6_info rcu protected")
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