[....] Starting enhanced syslogd: rsyslogd[ 16.792958] audit: type=1400 audit(1518872030.429:5): avc: denied { syslog } for pid=4016 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: [ 19.705757] audit: type=1400 audit(1518872033.342:6): avc: denied { map } for pid=4157 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 '10.128.15.213' (ECDSA) to the list of known hosts. executing program [ 25.958218] audit: type=1400 audit(1518872039.595:7): avc: denied { map } for pid=4171 comm="syzkaller027785" path="/root/syzkaller027785772" 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 [ 25.986334] [ 25.988064] ============================= [ 25.992236] WARNING: suspicious RCU usage [ 25.996391] 4.16.0-rc1+ #231 Not tainted [ 26.000455] ----------------------------- [ 26.005132] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 26.014414] [ 26.014414] other info that might help us debug this: [ 26.014414] [ 26.022565] [ 26.022565] rcu_scheduler_active = 2, debug_locks = 1 [ 26.029245] 1 lock held by syzkaller027785/4171: [ 26.033999] #0: (rcu_read_lock){....}, at: [<0000000044ad7471>] __rds_conn_create+0xe46/0x1b50 [ 26.042975] [ 26.042975] stack backtrace: [ 26.047502] CPU: 1 PID: 4171 Comm: syzkaller027785 Not tainted 4.16.0-rc1+ #231 [ 26.054928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.064255] Call Trace: [ 26.066822] dump_stack+0x194/0x257 [ 26.070424] ? arch_local_irq_restore+0x53/0x53 [ 26.075076] lockdep_rcu_suspicious+0x123/0x170 [ 26.079721] ___might_sleep+0x385/0x470 [ 26.083671] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.089527] ? __debug_object_init+0x235/0x1040 [ 26.094175] ? lock_acquire+0x1d5/0x580 [ 26.098128] ? debug_mutex_init+0x1c/0x60 [ 26.102254] __might_sleep+0x95/0x190 [ 26.106038] kmem_cache_alloc_trace+0x299/0x740 [ 26.110682] ? lock_acquire+0x1d5/0x580 [ 26.114629] ? lock_acquire+0x1d5/0x580 [ 26.118574] ? __rds_conn_create+0xe46/0x1b50 [ 26.123048] rds_loop_conn_alloc+0xc8/0x380 [ 26.127353] ? rds_loop_conn_free+0x290/0x290 [ 26.131823] ? __init_waitqueue_head+0x97/0x140 [ 26.136468] ? rcutorture_record_progress+0x10/0x10 [ 26.141458] ? __lockdep_init_map+0xe4/0x650 [ 26.145844] __rds_conn_create+0x112f/0x1b50 [ 26.150245] ? rds_conn_drop+0xb0/0xb0 [ 26.154107] ? copyin+0x91/0xb0 [ 26.157371] ? _copy_from_iter+0xf30/0xf30 [ 26.161587] ? rds_message_copy_from_user+0x375/0xc60 [ 26.166749] ? lockdep_init_map+0x9/0x10 [ 26.170785] ? __init_waitqueue_head+0x97/0x140 [ 26.175434] ? rds_message_map_pages+0x330/0x330 [ 26.180161] ? rds_message_alloc+0x28c/0x330 [ 26.184541] ? rds_message_next_extension+0x210/0x210 [ 26.189701] ? trace_hardirqs_on+0xd/0x10 [ 26.193826] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.198208] ? memset+0x31/0x40 [ 26.201468] rds_conn_create_outgoing+0x3f/0x50 [ 26.206113] rds_sendmsg+0xe63/0x2550 [ 26.209889] ? avc_has_perm+0x43e/0x680 [ 26.213847] ? rds_send_drop_to+0x1930/0x1930 [ 26.218315] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.222786] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.227787] ? find_held_lock+0x35/0x1d0 [ 26.231842] ? sock_has_perm+0x2a4/0x420 [ 26.235876] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.241208] ? lock_release+0xa22/0xa40 [ 26.245161] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.251027] ? __check_object_size+0x8b/0x530 [ 26.255495] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.259967] ? __might_sleep+0x95/0x190 [ 26.263917] ? selinux_socket_sendmsg+0x36/0x40 [ 26.268563] ? security_socket_sendmsg+0x89/0xb0 [ 26.273298] ? rds_send_drop_to+0x1930/0x1930 [ 26.277777] sock_sendmsg+0xca/0x110 [ 26.281467] SYSC_sendto+0x361/0x5c0 [ 26.285157] ? SYSC_connect+0x4a0/0x4a0 [ 26.289110] ? __do_page_fault+0x5f7/0xc90 [ 26.293318] ? lock_downgrade+0x980/0x980 [ 26.297453] ? handle_mm_fault+0x43b/0x970 [ 26.301678] ? up_read+0x1a/0x40 [ 26.305027] ? __do_page_fault+0x3d6/0xc90 [ 26.309254] ? mm_fault_error+0x2c0/0x2c0 [ 26.313376] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.318894] SyS_sendto+0x40/0x50 [ 26.322324] ? SyS_getpeername+0x30/0x30 [ 26.326359] do_syscall_64+0x282/0x940 [ 26.330218] ? __do_page_fault+0xc90/0xc90 [ 26.334425] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.339156] ? syscall_return_slowpath+0x550/0x550 [ 26.344058] ? syscall_return_slowpath+0x2ac/0x550 [ 26.348958] ? prepare_exit_to_usermode+0x350/0x350 [ 26.353950] ? retint_user+0x18/0x18 [ 26.357637] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.362461] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.367625] RIP: 0033:0x43fd99 [ 26.370786] RSP: 002b:00007ffce2d73a28 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.378464] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.385708] RDX: 00000000000001c1 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 26.392947] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 26.400188] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.407433] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.414746] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.422200] in_atomic(): 1, irqs_disabled(): 0, pid: 4171, name: syzkaller027785 [ 26.429749] 1 lock held by syzkaller027785/4171: [ 26.434516] #0: (rcu_read_lock){....}, at: [<0000000044ad7471>] __rds_conn_create+0xe46/0x1b50 [ 26.443474] CPU: 1 PID: 4171 Comm: syzkaller027785 Not tainted 4.16.0-rc1+ #231 [ 26.450898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.460226] Call Trace: [ 26.462793] dump_stack+0x194/0x257 [ 26.466396] ? arch_local_irq_restore+0x53/0x53 [ 26.471046] ? print_lock+0x9f/0xa2 [ 26.474652] ? lockdep_print_held_locks+0xc4/0x130 [ 26.479565] ___might_sleep+0x2b2/0x470 [ 26.483514] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.489375] ? __debug_object_init+0x235/0x1040 [ 26.494022] ? lock_acquire+0x1d5/0x580 [ 26.497971] ? debug_mutex_init+0x1c/0x60 [ 26.502103] __might_sleep+0x95/0x190 [ 26.505896] kmem_cache_alloc_trace+0x299/0x740 [ 26.510547] ? lock_acquire+0x1d5/0x580 [ 26.514491] ? lock_acquire+0x1d5/0x580 [ 26.518439] ? __rds_conn_create+0xe46/0x1b50 [ 26.522912] rds_loop_conn_alloc+0xc8/0x380 [ 26.527225] ? rds_loop_conn_free+0x290/0x290 [ 26.531696] ? __init_waitqueue_head+0x97/0x140 [ 26.536346] ? rcutorture_record_progress+0x10/0x10 [ 26.541338] ? __lockdep_init_map+0xe4/0x650 [ 26.545740] __rds_conn_create+0x112f/0x1b50 [ 26.550162] ? rds_conn_drop+0xb0/0xb0 [ 26.554034] ? copyin+0x91/0xb0 [ 26.557308] ? _copy_from_iter+0xf30/0xf30 [ 26.561532] ? rds_message_copy_from_user+0x375/0xc60 [ 26.566699] ? lockdep_init_map+0x9/0x10 [ 26.570745] ? __init_waitqueue_head+0x97/0x140 [ 26.575403] ? rds_message_map_pages+0x330/0x330 [ 26.580151] ? rds_message_alloc+0x28c/0x330 [ 26.584544] ? rds_message_next_extension+0x210/0x210 [ 26.589710] ? trace_hardirqs_on+0xd/0x10 [ 26.593840] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.598227] ? memset+0x31/0x40 [ 26.601488] rds_conn_create_outgoing+0x3f/0x50 [ 26.606135] rds_sendmsg+0xe63/0x2550 [ 26.609909] ? avc_has_perm+0x43e/0x680 [ 26.613874] ? rds_send_drop_to+0x1930/0x1930 [ 26.618342] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.622811] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.627812] ? find_held_lock+0x35/0x1d0 [ 26.631865] ? sock_has_perm+0x2a4/0x420 [ 26.635903] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.641235] ? lock_release+0xa22/0xa40 [ 26.645180] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.651047] ? __check_object_size+0x8b/0x530 [ 26.655520] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.660013] ? __might_sleep+0x95/0x190 [ 26.663974] ? selinux_socket_sendmsg+0x36/0x40 [ 26.668622] ? security_socket_sendmsg+0x89/0xb0 [ 26.673356] ? rds_send_drop_to+0x1930/0x1930 [ 26.677833] sock_sendmsg+0xca/0x110 [ 26.681525] SYSC_sendto+0x361/0x5c0 [ 26.685217] ? SYSC_connect+0x4a0/0x4a0 [ 26.689171] ? __do_page_fault+0x5f7/0xc90 [ 26.693384] ? lock_downgrade+0x980/0x980 [ 26.697516] ? handle_mm_fault+0x43b/0x970 [ 26.701737] ? up_read+0x1a/0x40 [ 26.705077] ? __do_page_fault+0x3d6/0xc90 [ 26.709292] ? mm_fault_error+0x2c0/0x2c0 [ 26.713413] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.718926] SyS_sendto+0x40/0x50 [ 26.722355] ? SyS_getpeername+0x30/0x30 [ 26.726388] do_syscall_64+0x282/0x940 [ 26.730247] ? __do_page_fault+0xc90/0xc90 [ 26.734452] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.739189] ? syscall_return_slowpath+0x550/0x550 [ 26.744099] ? syscall_return_slowpath+0x2ac/0x550 [ 26.749000] ? prepare_exit_to_usermode+0x350/0x350 [ 26.753998] ? retint_user+0x18/0x18 [ 26.757694] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.762512] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.767672] RIP: 0033:0x43fd99 [ 26.770834] RSP: 002b:00007ffce2d73a28 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.778511] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.785753] RDX: 00000000000001c1 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 26.792993] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 26.800239] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.807484] R13: 0000000000401750 R14: 00000000000