[....] Starting enhanced syslogd: rsyslogd[ 14.946365] audit: type=1400 audit(1518377693.656:5): avc: denied { syslog } for pid=3957 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.659882] audit: type=1400 audit(1518377698.369:6): avc: denied { map } for pid=4097 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. executing program [ 26.002596] audit: type=1400 audit(1518377704.712:7): avc: denied { map } for pid=4111 comm="syzkaller106830" path="/root/syzkaller106830416" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 26.031442] [ 26.033117] ============================= [ 26.037267] WARNING: suspicious RCU usage [ 26.041419] 4.15.0+ #308 Not tainted [ 26.045143] ----------------------------- [ 26.049306] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 26.058591] [ 26.058591] other info that might help us debug this: [ 26.058591] [ 26.066741] [ 26.066741] rcu_scheduler_active = 2, debug_locks = 1 [ 26.073438] 1 lock held by syzkaller106830/4111: [ 26.078191] #0: (rcu_read_lock){....}, at: [<000000007b974245>] __rds_conn_create+0xe46/0x1b50 [ 26.087138] [ 26.087138] stack backtrace: [ 26.091656] CPU: 1 PID: 4111 Comm: syzkaller106830 Not tainted 4.15.0+ #308 [ 26.098737] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.108065] Call Trace: [ 26.110632] dump_stack+0x194/0x257 [ 26.114233] ? arch_local_irq_restore+0x53/0x53 [ 26.118899] lockdep_rcu_suspicious+0x123/0x170 [ 26.123560] ___might_sleep+0x385/0x470 [ 26.127520] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.133391] ? __debug_object_init+0x235/0x1040 [ 26.138047] ? lock_acquire+0x1d5/0x580 [ 26.142006] ? debug_mutex_init+0x1c/0x60 [ 26.146158] __might_sleep+0x95/0x190 [ 26.149949] kmem_cache_alloc_trace+0x299/0x740 [ 26.154597] ? lock_acquire+0x1d5/0x580 [ 26.158547] ? lock_acquire+0x1d5/0x580 [ 26.162498] ? __rds_conn_create+0xe46/0x1b50 [ 26.166969] rds_loop_conn_alloc+0xc8/0x380 [ 26.171264] ? rds_loop_conn_free+0x290/0x290 [ 26.175735] ? __init_waitqueue_head+0x97/0x140 [ 26.180380] ? rcutorture_record_progress+0x10/0x10 [ 26.185367] ? __lockdep_init_map+0xe4/0x650 [ 26.189750] __rds_conn_create+0x112f/0x1b50 [ 26.194148] ? rds_conn_drop+0xb0/0xb0 [ 26.198027] ? __raw_spin_lock_init+0x1c/0x100 [ 26.202586] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.207578] ? __lockdep_init_map+0xe4/0x650 [ 26.211962] ? lockdep_init_map+0x9/0x10 [ 26.215993] ? __init_waitqueue_head+0x97/0x140 [ 26.220732] ? init_wait_entry+0x1b0/0x1b0 [ 26.224941] ? lockdep_init_map+0x9/0x10 [ 26.228977] ? rds_message_alloc+0x28c/0x330 [ 26.233356] ? rds_message_next_extension+0x210/0x210 [ 26.238516] ? trace_hardirqs_on+0xd/0x10 [ 26.242638] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.247028] ? __release_sock+0x360/0x360 [ 26.251150] ? lock_sock_nested+0x91/0x110 [ 26.255368] rds_conn_create_outgoing+0x3f/0x50 [ 26.260016] rds_sendmsg+0xda3/0x2390 [ 26.263805] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.268270] ? __might_fault+0x110/0x1d0 [ 26.272315] ? lock_release+0xa40/0xa40 [ 26.276264] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.282128] ? find_held_lock+0x35/0x1d0 [ 26.286166] ? sock_has_perm+0x2a4/0x420 [ 26.290198] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.295530] ? lock_downgrade+0x980/0x980 [ 26.299647] ? dup_iter+0x172/0x260 [ 26.303254] ? lock_release+0xa40/0xa40 [ 26.307212] ? selinux_socket_sendmsg+0x36/0x40 [ 26.311855] ? security_socket_sendmsg+0x89/0xb0 [ 26.316589] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.321060] sock_sendmsg+0xca/0x110 [ 26.324746] ___sys_sendmsg+0x320/0x8b0 [ 26.328697] ? copy_msghdr_from_user+0x590/0x590 [ 26.333423] ? finish_task_switch+0x29b/0x890 [ 26.337894] ? copy_overflow+0x20/0x20 [ 26.341762] ? __fget_light+0x2b2/0x3c0 [ 26.345722] ? fget_raw+0x20/0x20 [ 26.349162] ? find_held_lock+0x35/0x1d0 [ 26.353202] ? __fdget+0x18/0x20 [ 26.356548] __sys_sendmmsg+0x1ee/0x620 [ 26.360498] ? __sys_sendmmsg+0x1ee/0x620 [ 26.364624] ? SyS_sendmsg+0x50/0x50 [ 26.368312] ? lock_downgrade+0x980/0x980 [ 26.372442] ? handle_mm_fault+0x43b/0x970 [ 26.376658] ? up_read+0x1a/0x40 [ 26.379997] ? __do_page_fault+0x3d6/0xc90 [ 26.384218] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.389739] SyS_sendmmsg+0x35/0x60 [ 26.393339] ? __sys_sendmmsg+0x620/0x620 [ 26.397459] do_syscall_64+0x282/0x940 [ 26.401318] ? __do_page_fault+0xc90/0xc90 [ 26.405523] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.411036] ? syscall_return_slowpath+0x550/0x550 [ 26.415938] ? syscall_return_slowpath+0x2ac/0x550 [ 26.420844] ? retint_user+0x18/0x18 [ 26.424535] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.429355] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.434514] RIP: 0033:0x43fe29 [ 26.437674] RSP: 002b:00007ffedf633ee8 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 26.445355] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 26.452596] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 26.459836] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 26.467076] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 26.474321] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 26.481637] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.489094] in_atomic(): 1, irqs_disabled(): 0, pid: 4111, name: syzkaller106830 [ 26.496641] 1 lock held by syzkaller106830/4111: [ 26.501396] #0: (rcu_read_lock){....}, at: [<000000007b974245>] __rds_conn_create+0xe46/0x1b50 [ 26.510357] CPU: 1 PID: 4111 Comm: syzkaller106830 Not tainted 4.15.0+ #308 [ 26.517433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.526757] Call Trace: [ 26.529319] dump_stack+0x194/0x257 [ 26.532925] ? arch_local_irq_restore+0x53/0x53 [ 26.537567] ? print_lock+0x9f/0xa2 [ 26.541166] ? lockdep_print_held_locks+0xc4/0x130 [ 26.546074] ___might_sleep+0x2b2/0x470 [ 26.550029] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.555884] ? __debug_object_init+0x235/0x1040 [ 26.560523] ? lock_acquire+0x1d5/0x580 [ 26.564468] ? debug_mutex_init+0x1c/0x60 [ 26.568589] __might_sleep+0x95/0x190 [ 26.572368] kmem_cache_alloc_trace+0x299/0x740 [ 26.577015] ? lock_acquire+0x1d5/0x580 [ 26.580965] ? lock_acquire+0x1d5/0x580 [ 26.584915] ? __rds_conn_create+0xe46/0x1b50 [ 26.589399] rds_loop_conn_alloc+0xc8/0x380 [ 26.593694] ? rds_loop_conn_free+0x290/0x290 [ 26.598168] ? __init_waitqueue_head+0x97/0x140 [ 26.602812] ? rcutorture_record_progress+0x10/0x10 [ 26.607806] ? __lockdep_init_map+0xe4/0x650 [ 26.612191] __rds_conn_create+0x112f/0x1b50 [ 26.616588] ? rds_conn_drop+0xb0/0xb0 [ 26.620455] ? __raw_spin_lock_init+0x1c/0x100 [ 26.625013] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.630042] ? __lockdep_init_map+0xe4/0x650 [ 26.634440] ? lockdep_init_map+0x9/0x10 [ 26.638478] ? __init_waitqueue_head+0x97/0x140 [ 26.643124] ? init_wait_entry+0x1b0/0x1b0 [ 26.647338] ? lockdep_init_map+0x9/0x10 [ 26.651376] ? rds_message_alloc+0x28c/0x330 [ 26.655753] ? rds_message_next_extension+0x210/0x210 [ 26.660912] ? trace_hardirqs_on+0xd/0x10 [ 26.665040] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.669426] ? __release_sock+0x360/0x360 [ 26.673542] ? lock_sock_nested+0x91/0x110 [ 26.677751] rds_conn_create_outgoing+0x3f/0x50 [ 26.682395] rds_sendmsg+0xda3/0x2390 [ 26.686181] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.690648] ? __might_fault+0x110/0x1d0 [ 26.694687] ? lock_release+0xa40/0xa40 [ 26.698635] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.704495] ? find_held_lock+0x35/0x1d0 [ 26.708534] ? sock_has_perm+0x2a4/0x420 [ 26.712569] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.717902] ? lock_downgrade+0x980/0x980 [ 26.722024] ? dup_iter+0x172/0x260 [ 26.725627] ? lock_release+0xa40/0xa40 [ 26.729584] ? selinux_socket_sendmsg+0x36/0x40 [ 26.734230] ? security_socket_sendmsg+0x89/0xb0 [ 26.739600] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.744069] sock_sendmsg+0xca/0x110 [ 26.747758] ___sys_sendmsg+0x320/0x8b0 [ 26.751707] ? copy_msghdr_from_user+0x590/0x590 [ 26.756435] ? finish_task_switch+0x29b/0x890 [ 26.760907] ? copy_overflow+0x20/0x20 [ 26.764775] ? __fget_light+0x2b2/0x3c0 [ 26.768720] ? fget_raw+0x20/0x20 [ 26.772161] ? find_held_lock+0x35/0x1d0 [ 26.776198] ? __fdget+0x18/0x20 [ 26.779541] __sys_sendmmsg+0x1ee/0x620 [ 26.783490] ? __sys_sendmmsg+0x1ee/0x620 [ 26.787619] ? SyS_sendmsg+0x50/0x50 [ 26.791316] ? lock_downgrade+0x980/0x980 [ 26.795443] ? handle_mm_fault+0x43b/0x970 [ 26.799660] ? up_read+0x1a/0x40 [ 26.803003] ? __do_page_fault+0x3d6/0xc90 [ 26.807227] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.812744] SyS_sendmmsg+0x35/0x60 [ 26.816362] ? __sys_sendmmsg+0x620/0x620 [ 26.820483] do_syscall_64+0x282/0x940 [ 26.824342] ? __do_page_fault+0xc90/0xc90 [ 26.828551] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.834069] ? syscall_return_slowpath+0x550/0x550 [ 26.838986] ? syscall_return_slowpath+0x2ac/0x550 [ 26.843919] ? retint_user+0x18/0x18 [ 26.847620] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.852446] entry_SYSCALL_64_after_hwfra