============================= WARNING: suspicious RCU usage 4.15.0+ #308 Not tainted ----------------------------- ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor6/6419: #0: (rcu_read_lock){....}, at: [<00000000e22a68b1>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 stack backtrace: CPU: 0 PID: 6419 Comm: syz-executor6 Not tainted 4.15.0+ #308 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:4592 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline] ___might_sleep+0x385/0x470 kernel/sched/core.c:6093 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 slab_pre_alloc_hook mm/slab.h:420 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x2a2/0x760 mm/slab.c:3539 rds_tcp_conn_alloc+0xa7/0x4e0 net/rds/tcp.c:296 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453a59 RSP: 002b:00007fc43c398c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc43c3996d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b5 R14: 00000000006f7198 R15: 0000000000000000 BUG: sleeping function called from invalid context at mm/slab.h:420 in_atomic(): 1, irqs_disabled(): 0, pid: 6419, name: syz-executor6 1 lock held by syz-executor6/6419: #0: (rcu_read_lock){....}, at: [<00000000e22a68b1>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 CPU: 0 PID: 6419 Comm: syz-executor6 Not tainted 4.15.0+ #308 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 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 slab_pre_alloc_hook mm/slab.h:420 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x2a2/0x760 mm/slab.c:3539 rds_tcp_conn_alloc+0xa7/0x4e0 net/rds/tcp.c:296 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453a59 RSP: 002b:00007fc43c398c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc43c3996d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b5 R14: 00000000006f7198 R15: 0000000000000000 atomic_op 000000004c1cee9b conn xmit_atomic (null) raw_sendmsg: syz-executor0 forgot to set AF_INET. Fix it! netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1400 audit(1518375292.712:71): avc: denied { set_context_mgr } for pid=6550 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=binder permissive=1 netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. binder: BINDER_SET_CONTEXT_MGR already set binder: 6550:6567 ioctl 40046207 0 returned -16 audit: type=1401 audit(1518375293.138:72): op=fscreate invalid_context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rying to set illegal importance in message Trying to set illegal importance in message BUG: sleeping function called from invalid context at mm/slab.h:420 in_atomic(): 1, irqs_disabled(): 0, pid: 6716, name: syz-executor1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=9692 sclass=netlink_route_socket pig=6713 comm=syz-executor3 1 lock held by syz-executor1/6716: #0: (rcu_read_lock){....}, at: [<00000000e22a68b1>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 CPU: 1 PID: 6716 Comm: syz-executor1 Tainted: G W 4.15.0+ #308 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 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=9692 sclass=netlink_route_socket pig=6713 comm=syz-executor3 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 slab_pre_alloc_hook mm/slab.h:420 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc_trace+0x299/0x740 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] rds_loop_conn_alloc+0xc8/0x380 net/rds/loop.c:126 __rds_conn_create+0x112f/0x1b50 net/rds/connection.c:227 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:309 rds_sendmsg+0xda3/0x2390 net/rds/send.c:1126 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453a59 RSP: 002b:00007f13d07c7c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f13d07c86d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020007000 RDI: 0000000000000014 RBP: 000000000071bea0 R08: 0000000020000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl PPPIOCDETACH file->f_count=3 PPPIOCDETACH file->f_count=2 ipt_CLUSTERIP: Please specify destination IP ipt_CLUSTERIP: Please specify destination IP dccp_close: ABORT with 101 bytes unread binder: BINDER_SET_CONTEXT_MGR already set xt_socket: unknown flags 0xa4 binder: 6896:6902 ioctl 40046207 0 returned -16 QAT: Invalid ioctl binder: undelivered death notification, 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 20 bytes leftover after parsing attributes in process `syz-executor5'. ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #308 Tainted: G W ------------------------------------------------------ syz-executor0/6999 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<000000005333d29d>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000006edc8ca4>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&xt[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1093 get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:989 do_ip6t_get_ctl+0x159/0xaf0 net/ipv6/netfilter/ip6_tables.c:1710 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1df/0x2e0 net/ipv6/ipv6_sockglue.c:1371 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 ipv6_setsockopt+0xd7/0x130 net/ipv6/ipv6_sockglue.c:922 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b other info that might help us debug this: Chain exists of: rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor0/6999: #0: (&xt[i].mutex){+.+.}, at: [<000000006edc8ca4>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 stack backtrace: CPU: 0 PID: 6999 Comm: syz-executor0 Tainted: G W 4.15.0+ #308 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 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453a59 RSP: 002b:00007fb374b24c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fb374b256d4 RCX: 0000000000453a59 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 000000000071bf58 R08: 0000000000000280 R09: 0000000000000000 R10: 0000000020157d80 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d5 R14: 00000000006f7498 R15: 0000000000000001 device syz4 entered promiscuous mode device syz4 left promiscuous mode audit: type=1326 audit(1518375297.163:73): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7383 comm="syz-executor0" exe="/root/syz-executor0" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 audit: type=1400 audit(1518375297.223:74): avc: denied { map } for pid=7406 comm="syz-executor6" path="/dev/input/mice" dev="devtmpfs" ino=9106 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:mouse_device_t:s0 tclass=chr_file permissive=1 audit: type=1326 audit(1518375297.247:75): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7383 comm="syz-executor0" exe="/root/syz-executor0" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 IPVS: ftp: loaded support on port[0] = 21 IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready xt_dscp: dscp 7f out of range xt_dscp: dscp 7f out of range kvm [7716]: vcpu0, guest rIP: 0xfff0 Hyper-V unhandled rdmsr: 0x4000001d audit: type=1400 audit(1518375299.831:76): avc: denied { map } for pid=7818 comm="syz-executor6" path="/dev/usbmon0" dev="devtmpfs" ino=9103 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:usbmon_device_t:s0 tclass=chr_file permissive=1 audit: type=1400 audit(1518375299.882:77): avc: denied { setuid } for pid=7836 comm="syz-executor6" capability=7 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 1 PID: 7927 Comm: syz-executor3 Tainted: G W 4.15.0+ #308 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 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc_node mm/slab.c:3286 [inline] kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3629 __alloc_skb+0xf1/0x780 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:983 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1180 [inline] netlink_sendmsg+0xa86/0xe60 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453a59 RSP: 002b:00007f8a78132c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8a781336d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 000000002025bfc8 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 00000000000004b3 R14: 00000000006f7168 R15: 0000000000000000 device gretap0 entered promiscuous mode x_tables: ip_tables: TCPOPTSTRIP target: only valid in mangle table, not raw x_tables: ip_tables: TCPOPTSTRIP target: only valid in mangle table, not raw