============================= 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-executor0/9429: #0: (rcu_read_lock){....}, at: [<00000000ec58e481>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 stack backtrace: CPU: 0 PID: 9429 Comm: syz-executor0 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_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:00007fa6bc343c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa6bc3446d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020007000 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000020000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000 BUG: sleeping function called from invalid context at mm/slab.h:420 in_atomic(): 1, irqs_disabled(): 0, pid: 9429, name: syz-executor0 1 lock held by syz-executor0/9429: #0: (rcu_read_lock){....}, at: [<00000000ec58e481>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 CPU: 0 PID: 9429 Comm: syz-executor0 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_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:00007fa6bc343c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa6bc3446d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020007000 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000020000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000 program syz-executor1 is using a deprecated SCSI ioctl, please convert it to SG_IO program syz-executor1 is using a deprecated SCSI ioctl, please convert it to SG_IO device eql entered promiscuous mode sctp: [Deprecated]: syz-executor3 (pid 9577) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor3 (pid 9577) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead DRBG: could not allocate CTR cipher TFM handle: ctr(aes) audit: type=1400 audit(1518350166.805:67): avc: denied { shutdown } for pid=9656 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 xt_SECMARK: invalid security context 'system_u:object_r:udev_var_run_t:-0' xt_SECMARK: invalid security context 'system_u:object_r:udev_var_run_t:-0' SELinux: unrecognized netlink message: protocol=9 nlmsg_type=16 sclass=netlink_audit_socket pig=9695 comm=syz-executor1 audit: type=1400 audit(1518350166.959:68): avc: denied { setopt } for pid=9687 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 binder: 9783:9792 ERROR: BC_REGISTER_LOOPER called without request binder: 9792 RLIMIT_NICE not set binder: 9792 RLIMIT_NICE not set binder: BINDER_SET_CONTEXT_MGR already set binder: 9783:9807 ERROR: BC_REGISTER_LOOPER called without request binder: 9807 RLIMIT_NICE not set binder_alloc: 9783: binder_alloc_buf, no vma binder: 9783:9814 transaction failed 29189/-3, size 0-0 line 2957 binder: 9783:9792 ioctl 40046207 0 returned -16 binder: undelivered TRANSACTION_ERROR: 29189 binder: release 9783:9792 transaction 25 in, still active binder: send failed reply for transaction 25 to 9783:9807 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 audit: type=1326 audit(1518350167.531:69): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=9832 comm="syz-executor5" exe="/root/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 audit: type=1326 audit(1518350167.580:70): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=9832 comm="syz-executor5" exe="/root/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4208 sclass=netlink_route_socket pig=10052 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4208 sclass=netlink_route_socket pig=10052 comm=syz-executor6 binder: 10068:10071 ioctl 4b68 2096fffa returned -22 binder: 10068:10071 BC_INCREFS_DONE node 27 has no pending increfs request binder: BINDER_SET_CONTEXT_MGR already set binder: 10068:10077 ioctl 40046207 0 returned -16 binder: 10068:10092 ioctl 4b68 2096fffa returned -22 Cannot find add_set index 257 as target binder: 10170:10183 ioctl c0306201 20449fd0 returned -14 binder: 10170:10183 ioctl c0306201 20722fd0 returned -14 binder: 10170:10194 ioctl c0306201 203d7fd0 returned -14 binder: 10170:10183 ioctl c0306201 20449fd0 returned -14 binder: 10170:10203 ioctl c0306201 203d7fd0 returned -14 binder: 10170:10194 ioctl c0306201 20722fd0 returned -14 syz-executor6 (10199) used greatest stack depth: 14560 bytes left audit: type=1400 audit(1518350169.099:71): avc: denied { create } for pid=10196 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_iscsi_socket permissive=1 sock: sock_set_timeout: `syz-executor7' (pid 10270) tries to set negative timeout sock: sock_set_timeout: `syz-executor7' (pid 10270) tries to set negative timeout ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3 audit: type=1400 audit(1518350169.742:72): avc: denied { create } for pid=10364 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 audit: type=1400 audit(1518350169.744:73): avc: denied { write } for pid=10364 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 binder: 10400:10404 got transaction to invalid handle binder: 10400:10404 transaction failed 29201/-22, size 32-16 line 2842 binder_alloc: binder_alloc_mmap_handler: 10410 20000000-20002000 already mapped failed -16 binder: 10400:10426 got transaction to invalid handle binder: 10400:10426 transaction failed 29201/-22, size 32-16 line 2842 netlink: 'syz-executor0': attribute type 3 has an invalid length. audit: type=1400 audit(1518350170.779:74): avc: denied { accept } for pid=10607 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1518350171.093:75): avc: denied { create } for pid=10674 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1 audit: type=1326 audit(1518350171.206:76): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518350171.210:77): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=128 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518350171.211:78): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518350171.213:79): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=228 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518350171.213:80): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518350171.218:81): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10696 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=9 compat=0 ip=0x453a59 code=0x7ffc0000 --map-set only usable from mangle table ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #308 Tainted: G W ------------------------------------------------------ syz-executor5/10924 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000c652b726>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<0000000091d6b0b2>] 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_arpt_get_ctl+0x2a9/0xa00 net/ipv4/netfilter/arp_tables.c:1481 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571 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_INET){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 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+0x242/0x380 net/ipv6/netfilter/ip6_tables.c:673 __do_replace+0x7ac/0xa70 net/ipv6/netfilter/ip6_tables.c:1108 do_replace net/ipv6/netfilter/ip6_tables.c:1164 [inline] do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 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_INET --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor5/10924: #0: (&xt[i].mutex){+.+.}, at: [<0000000091d6b0b2>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 stack backtrace: CPU: 1 PID: 10924 Comm: syz-executor5 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+0x242/0x380 net/ipv6/netfilter/ip6_tables.c:673 __do_replace+0x7ac/0xa70 net/ipv6/netfilter/ip6_tables.c:1108 do_replace net/ipv6/netfilter/ip6_tables.c:1164 [inline] do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 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:00007f4121b90c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f4121b916d4 RCX: 0000000000453a59 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000015 RBP: 000000000071bf58 R08: 00000000000003c0 R09: 0000000000000000 R10: 0000000020010c40 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d4 R14: 00000000006f7480 R15: 0000000000000001 --map-set only usable from mangle table binder: 11017:11022 ERROR: BC_REGISTER_LOOPER called without request binder: 11022 RLIMIT_NICE not set binder: 11017:11022 ERROR: BC_REGISTER_LOOPER called without request binder: 11022 RLIMIT_NICE not set device eql entered promiscuous mode Protocol error: SET target dimension is over the limit! Protocol error: SET target dimension is over the limit! TCP: request_sock_TCP: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. binder: 11223 RLIMIT_NICE not set binder: BINDER_SET_CONTEXT_MGR already set binder: 11221:11243 ioctl 40046207 0 returned -16 binder: 11221:11223 BC_REQUEST_DEATH_NOTIFICATION invalid ref 0 binder: 11221:11243 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 Cannot find add_set index 14458 as target binder: 11350:11353 DecRefs 0 refcount change on invalid ref 3 ret -22 binder: 11350:11353 BC_DEAD_BINDER_DONE 0000000000000003 not found TCP: request_sock_TCPv6: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'. kauditd_printk_skb: 24 callbacks suppressed audit: type=1400 audit(1518350174.792:106): avc: denied { setgid } for pid=11408 comm="syz-executor2" capability=6 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 do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app xt_connbytes: Forcing CT accounting to be enabled