syzbot
suspicious RCU usage at ./include/net/inet_sock.h:LINE
Status:
fixed on 2019/11/08 07:00
Subsystems:
net
[Documentation on labels]
Reported-by: syzbot+79de6f09efc55fec084b706de3c91e9457433ac5@syzkaller.appspotmail.com
Fix commit:
3f32d0be6c16
tipc: lock wakeup & inputq at tipc_link_reset()
First crash: 3186d, last: 3094d
Sample crash report:
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
=============================
WARNING: suspicious RCU usage
4.15.0-rc5+ #237 Not tainted
-----------------------------
./include/net/inet_sock.h:136 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syzkaller887639/5545:
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000f2d84def>] lock_sock include/net/sock.h:1461 [inline]
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000f2d84def>] do_ipv6_setsockopt.isra.9+0x23d/0x38f0 net/ipv6/ipv6_sockglue.c:167
stack backtrace:
CPU: 0 PID: 5545 Comm: syzkaller887639 Not tainted 4.15.0-rc5+ #237
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
ireq_opt_deref include/net/inet_sock.h:135 [inline]
inet_csk_route_req+0x82a/0xca0 net/ipv4/inet_connection_sock.c:544
dccp_v4_send_response+0xa7/0x640 net/dccp/ipv4.c:485
dccp_v4_conn_request+0x9f4/0x11b0 net/dccp/ipv4.c:633
dccp_v6_conn_request+0xd30/0x1350 net/dccp/ipv6.c:317
dccp_rcv_state_process+0x574/0x1620 net/dccp/input.c:612
dccp_v4_do_rcv+0xeb/0x160 net/dccp/ipv4.c:682
dccp_v6_do_rcv+0x81a/0x9b0 net/dccp/ipv6.c:578
sk_backlog_rcv include/net/sock.h:907 [inline]
__release_sock+0x124/0x360 net/core/sock.c:2264
release_sock+0xa4/0x2a0 net/core/sock.c:2779
do_ipv6_setsockopt.isra.9+0x50f/0x38f0 net/ipv6/ipv6_sockglue.c:898
ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922
dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:573
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1829 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1808
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x445ec9
RSP: 002b:00007f900a03adb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445ec9
RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000004
RBP: 00000000006dbc20 R08: 0000000000000020 R09: 0000000000000000
R10: 000000002030a000 R11: 0000000000000297 R12: 0000000000000000
R13: 00007fff1a69b80f R14: 00007f900a03b9c0 R15: 0000000000000001
=============================
WARNING: suspicious RCU usage
4.15.0-rc5+ #237 Not tainted
-----------------------------
./include/net/inet_sock.h:136 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syzkaller887639/5545:
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000f2d84def>] lock_sock include/net/sock.h:1461 [inline]
#0: (sk_lock-AF_INET6){+.+.}, at: [<00000000f2d84def>] do_ipv6_setsockopt.isra.9+0x23d/0x38f0 net/ipv6/ipv6_sockglue.c:167
stack backtrace:
CPU: 0 PID: 5545 Comm: syzkaller887639 Not tainted 4.15.0-rc5+ #237
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
ireq_opt_deref include/net/inet_sock.h:135 [inline]
dccp_v4_send_response+0x4b0/0x640 net/dccp/ipv4.c:496
dccp_v4_conn_request+0x9f4/0x11b0 net/dccp/ipv4.c:633
dccp_v6_conn_request+0xd30/0x1350 net/dccp/ipv6.c:317
dccp_rcv_state_process+0x574/0x1620 net/dccp/input.c:612
dccp_v4_do_rcv+0xeb/0x160 net/dccp/ipv4.c:682
dccp_v6_do_rcv+0x81a/0x9b0 net/dccp/ipv6.c:578
sk_backlog_rcv include/net/sock.h:907 [inline]
__release_sock+0x124/0x360 net/core/sock.c:2264
release_sock+0xa4/0x2a0 net/core/sock.c:2779
do_ipv6_setsockopt.isra.9+0x50f/0x38f0 net/ipv6/ipv6_sockglue.c:898
ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922
dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:573
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1829 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1808
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x445ec9
RSP: 002b:00007f900a03adb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445ec9
RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000004
RBP: 00000000006dbc20 R08: 0000000000000020 R09: 0000000000000000
R10: 000000002030a000 R11: 0000000000000297 R12: 0000000000000000
R13: 00007fff1a69b80f R14: 00007f900a03b9c0 R15: 0000000000000001
net_ratelimit: 924 callbacks suppressed
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Struck through repros no longer work on HEAD.