============================= WARNING: suspicious RCU usage 4.15.0+ #307 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-executor0/7237: #0: (rcu_read_lock){....}, at: [<00000000905d9df1>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 stack backtrace: CPU: 1 PID: 7237 Comm: syz-executor0 Not tainted 4.15.0+ #307 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:00007f8d37de4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8d37de56d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000020b2d000 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: 7237, name: syz-executor0 1 lock held by syz-executor0/7237: #0: (rcu_read_lock){....}, at: [<00000000905d9df1>] __rds_conn_create+0xe46/0x1b50 net/rds/connection.c:218 CPU: 1 PID: 7237 Comm: syz-executor0 Not tainted 4.15.0+ #307 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:00007f8d37de4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f8d37de56d4 RCX: 0000000000453a59 RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000020b2d000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000 audit: type=1400 audit(1518303590.942:46): avc: denied { setopt } for pid=7270 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 sctp: [Deprecated]: syz-executor2 (pid 7275) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 7278) Use of int in maxseg socket option. Use struct sctp_assoc_value instead audit: type=1400 audit(1518303591.056:47): avc: denied { getattr } for pid=7282 comm="syz-executor7" name="NETLINK" dev="sockfs" ino=19791 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 device eql entered promiscuous mode audit: type=1400 audit(1518303591.766:48): avc: denied { ipc_lock } for pid=7448 comm="syz-executor4" capability=14 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 audit: type=1400 audit(1518303591.874:49): avc: denied { map } for pid=7458 comm="syz-executor4" path="/proc/396/net/pfkey" dev="proc" ino=4026533189 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=1 xt_AUDIT: Audit type out of range (valid range: 0..2) xt_AUDIT: Audit type out of range (valid range: 0..2) syz-executor1 (7558): /proc/7555/oom_adj is deprecated, please use /proc/7555/oom_score_adj instead. audit: type=1326 audit(1518303592.385:50): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518303592.417:51): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=85 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518303592.418:52): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518303592.419:53): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=16 compat=0 ip=0x453a59 code=0x7ffc0000 ipt_CLUSTERIP: Please specify destination IP audit: type=1326 audit(1518303592.419:54): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518303592.419:55): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=51 compat=0 ip=0x453a59 code=0x7ffc0000 ipt_CLUSTERIP: Please specify destination IP audit: type=1326 audit(1518303592.420:56): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x7ffc0000 audit: type=1326 audit(1518303592.420:57): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7597 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=49 compat=0 ip=0x453a59 code=0x7ffc0000 ipt_CLUSTERIP: Please specify destination IP xt_connbytes: Forcing CT accounting to be enabled SELinux: unrecognized netlink message: protocol=9 nlmsg_type=16 sclass=netlink_audit_socket pig=7930 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=16 sclass=netlink_audit_socket pig=7937 comm=syz-executor0 ====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #307 Tainted: G W ------------------------------------------------------ syz-executor3/8125 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000eb92a727>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000005249815a>] 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-executor3/8125: #0: (&xt[i].mutex){+.+.}, at: [<000000005249815a>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 stack backtrace: CPU: 0 PID: 8125 Comm: syz-executor3 Tainted: G W 4.15.0+ #307 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:00007fabdfa33c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fabdfa346d4 RCX: 0000000000453a59 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000018 RBP: 000000000071bea0 R08: 0000000000000280 R09: 0000000000000000 R10: 00000000203ae000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d5 R14: 00000000006f7498 R15: 0000000000000000 xprt_adjust_timeout: rq_timeout = 0! xprt_adjust_timeout: rq_timeout = 0! binder: 8628 RLIMIT_NICE not set binder: 8623:8628 ioctl c0306201 2000a000 returned -11 kauditd_printk_skb: 60 callbacks suppressed audit: type=1400 audit(1518303597.520:118): avc: denied { net_broadcast } for pid=8790 comm="syz-executor4" capability=11 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 netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 8951 Comm: syz-executor7 Tainted: G W 4.15.0+ #307 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_fail_alloc_page mm/page_alloc.c:2955 [inline] prepare_alloc_pages mm/page_alloc.c:4194 [inline] __alloc_pages_nodemask+0x327/0xdd0 mm/page_alloc.c:4233 alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:492 [inline] skb_page_frag_refill+0x358/0x5f0 net/core/sock.c:2208 tun_build_skb.isra.50+0x2f0/0x1850 drivers/net/tun.c:1631 tun_get_user+0x17d0/0x3940 drivers/net/tun.c:1802 tun_chr_write_iter+0xbd/0x1c0 drivers/net/tun.c:1988 call_write_iter include/linux/fs.h:1781 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_writev+0x18a/0x340 fs/read_write.c:977 do_writev+0xfc/0x2a0 fs/read_write.c:1012 SYSC_writev fs/read_write.c:1085 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1082 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453931 RSP: 002b:00007fc61f998ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 0000000000453931 RDX: 0000000000000001 RSI: 00007fc61f998bf0 RDI: 0000000000000012 RBP: 0000000020c89fba R08: 0000000000000012 R09: 0000000000000000 R10: 0000000000000046 R11: 0000000000000293 R12: 0000000000000014 R13: 000000000000060f R14: 00000000006f9208 R15: 0000000000000000 audit: type=1400 audit(1518303599.347:119): avc: denied { write } for pid=9176 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