[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 17.839697] audit: type=1400 audit(1518322122.210:6): avc: denied { map } for pid=4094 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.121127] audit: type=1400 audit(1518322128.491:7): avc: denied { map } for pid=4108 comm="syzkaller284347" path="/root/syzkaller284347783" 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 [ 24.147984] [ 24.149768] ============================= [ 24.153927] WARNING: suspicious RCU usage [ 24.158081] 4.15.0+ #218 Not tainted [ 24.161814] ----------------------------- [ 24.165967] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.175245] [ 24.175245] other info that might help us debug this: [ 24.175245] [ 24.183406] [ 24.183406] rcu_scheduler_active = 2, debug_locks = 1 [ 24.190081] 1 lock held by syzkaller284347/4108: [ 24.194842] #0: (rcu_read_lock){....}, at: [<0000000058f6cf05>] __rds_conn_create+0xe46/0x1b50 [ 24.203800] [ 24.203800] stack backtrace: [ 24.208312] CPU: 0 PID: 4108 Comm: syzkaller284347 Not tainted 4.15.0+ #218 [ 24.215389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.224730] Call Trace: [ 24.227295] dump_stack+0x194/0x257 [ 24.230898] ? arch_local_irq_restore+0x53/0x53 [ 24.235557] lockdep_rcu_suspicious+0x123/0x170 [ 24.240212] ___might_sleep+0x385/0x470 [ 24.244164] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.250027] ? __debug_object_init+0x235/0x1040 [ 24.254675] ? debug_mutex_init+0x1c/0x60 [ 24.258804] __might_sleep+0x95/0x190 [ 24.262589] kmem_cache_alloc_trace+0x299/0x740 [ 24.267237] ? lock_acquire+0x1d5/0x580 [ 24.271186] ? lock_acquire+0x1d5/0x580 [ 24.275149] ? __rds_conn_create+0xe46/0x1b50 [ 24.279626] rds_loop_conn_alloc+0xc8/0x380 [ 24.283926] ? rds_loop_conn_free+0x290/0x290 [ 24.288401] ? __init_waitqueue_head+0x97/0x140 [ 24.293052] ? rcutorture_record_progress+0x10/0x10 [ 24.298048] ? __lockdep_init_map+0xe4/0x650 [ 24.302449] __rds_conn_create+0x112f/0x1b50 [ 24.306853] ? rds_conn_drop+0xb0/0xb0 [ 24.310725] ? __raw_spin_lock_init+0x1c/0x100 [ 24.315286] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.320282] ? __lockdep_init_map+0xe4/0x650 [ 24.324670] ? lockdep_init_map+0x9/0x10 [ 24.328705] ? __init_waitqueue_head+0x97/0x140 [ 24.333360] ? init_wait_entry+0x1b0/0x1b0 [ 24.337588] ? lockdep_init_map+0x9/0x10 [ 24.341638] ? rds_message_alloc+0x28c/0x330 [ 24.346029] ? rds_message_next_extension+0x210/0x210 [ 24.351195] ? trace_hardirqs_on+0xd/0x10 [ 24.355320] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.359710] ? __release_sock+0x360/0x360 [ 24.363830] ? lock_sock_nested+0x91/0x110 [ 24.368049] rds_conn_create_outgoing+0x3f/0x50 [ 24.372698] rds_sendmsg+0xda3/0x2390 [ 24.376481] ? avc_has_perm+0x43e/0x680 [ 24.380446] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.384917] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.389393] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.394406] ? find_held_lock+0x35/0x1d0 [ 24.398453] ? sock_has_perm+0x2a4/0x420 [ 24.402492] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.407832] ? lock_release+0xa22/0xa40 [ 24.411783] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.417646] ? __check_object_size+0x8b/0x530 [ 24.422139] ? __might_sleep+0x95/0x190 [ 24.426095] ? selinux_socket_sendmsg+0x36/0x40 [ 24.430741] ? security_socket_sendmsg+0x89/0xb0 [ 24.435475] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.439950] sock_sendmsg+0xca/0x110 [ 24.443643] SYSC_sendto+0x361/0x5c0 [ 24.447336] ? SYSC_connect+0x4a0/0x4a0 [ 24.451291] ? find_held_lock+0x35/0x1d0 [ 24.455338] ? lock_downgrade+0x980/0x980 [ 24.459488] ? up_read+0x1a/0x40 [ 24.462831] ? __do_page_fault+0x3d6/0xc90 [ 24.467061] SyS_sendto+0x40/0x50 [ 24.470502] ? SyS_getpeername+0x30/0x30 [ 24.474541] do_fast_syscall_32+0x3ee/0xfa1 [ 24.478846] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.483408] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.488149] ? syscall_return_slowpath+0x550/0x550 [ 24.493058] ? syscall_return_slowpath+0x2ac/0x550 [ 24.497963] ? prepare_exit_to_usermode+0x350/0x350 [ 24.502959] ? retint_user+0x18/0x18 [ 24.506651] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.511477] entry_SYSENTER_compat+0x54/0x63 [ 24.515867] RIP: 0023:0xf7fb1c79 [ 24.519203] RSP: 002b:00000000fff34edc EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 24.526884] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000002056a000 [ 24.534130] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020dfcff0 [ 24.541394] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 24.548647] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.555899] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.563431] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.570898] in_atomic(): 1, irqs_disabled(): 0, pid: 4108, name: syzkaller284347 [ 24.578455] 1 lock held by syzkaller284347/4108: [ 24.583221] #0: (rcu_read_lock){....}, at: [<0000000058f6cf05>] __rds_conn_create+0xe46/0x1b50 [ 24.592181] CPU: 0 PID: 4108 Comm: syzkaller284347 Not tainted 4.15.0+ #218 [ 24.599267] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.608599] Call Trace: [ 24.611166] dump_stack+0x194/0x257 [ 24.614774] ? arch_local_irq_restore+0x53/0x53 [ 24.619433] ? print_lock+0x9f/0xa2 [ 24.623041] ? lockdep_print_held_locks+0xc4/0x130 [ 24.627959] ___might_sleep+0x2b2/0x470 [ 24.631908] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.637767] ? __debug_object_init+0x235/0x1040 [ 24.642415] ? debug_mutex_init+0x1c/0x60 [ 24.646542] __might_sleep+0x95/0x190 [ 24.650325] kmem_cache_alloc_trace+0x299/0x740 [ 24.655066] ? lock_acquire+0x1d5/0x580 [ 24.659022] ? lock_acquire+0x1d5/0x580 [ 24.662982] ? __rds_conn_create+0xe46/0x1b50 [ 24.667463] rds_loop_conn_alloc+0xc8/0x380 [ 24.671765] ? rds_loop_conn_free+0x290/0x290 [ 24.676246] ? __init_waitqueue_head+0x97/0x140 [ 24.680895] ? rcutorture_record_progress+0x10/0x10 [ 24.685889] ? __lockdep_init_map+0xe4/0x650 [ 24.690289] __rds_conn_create+0x112f/0x1b50 [ 24.694691] ? rds_conn_drop+0xb0/0xb0 [ 24.698572] ? __raw_spin_lock_init+0x1c/0x100 [ 24.703133] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.708131] ? __lockdep_init_map+0xe4/0x650 [ 24.712520] ? lockdep_init_map+0x9/0x10 [ 24.716561] ? __init_waitqueue_head+0x97/0x140 [ 24.721206] ? init_wait_entry+0x1b0/0x1b0 [ 24.725419] ? lockdep_init_map+0x9/0x10 [ 24.729469] ? rds_message_alloc+0x28c/0x330 [ 24.733853] ? rds_message_next_extension+0x210/0x210 [ 24.739034] ? trace_hardirqs_on+0xd/0x10 [ 24.743172] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.747558] ? __release_sock+0x360/0x360 [ 24.751677] ? lock_sock_nested+0x91/0x110 [ 24.755890] rds_conn_create_outgoing+0x3f/0x50 [ 24.760539] rds_sendmsg+0xda3/0x2390 [ 24.764312] ? avc_has_perm+0x43e/0x680 [ 24.768276] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.772748] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.777220] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.782218] ? find_held_lock+0x35/0x1d0 [ 24.786264] ? sock_has_perm+0x2a4/0x420 [ 24.790302] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.795651] ? lock_release+0xa22/0xa40 [ 24.799602] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.805471] ? __check_object_size+0x8b/0x530 [ 24.809949] ? __might_sleep+0x95/0x190 [ 24.813903] ? selinux_socket_sendmsg+0x36/0x40 [ 24.818548] ? security_socket_sendmsg+0x89/0xb0 [ 24.823305] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.827790] sock_sendmsg+0xca/0x110 [ 24.831482] SYSC_sendto+0x361/0x5c0 [ 24.835194] ? SYSC_connect+0x4a0/0x4a0 [ 24.839155] ? find_held_lock+0x35/0x1d0 [ 24.843200] ? lock_downgrade+0x980/0x980 [ 24.847345] ? up_read+0x1a/0x40 [ 24.850703] ? __do_page_fault+0x3d6/0xc90 [ 24.854921] SyS_sendto+0x40/0x50 [ 24.858350] ? SyS_getpeername+0x30/0x30 [ 24.862400] do_fast_syscall_32+0x3ee/0xfa1 [ 24.866709] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.871267] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.875999] ? syscall_return_slowpath+0x550/0x550 [ 24.880911] ? syscall_return_slowpath+0x2ac/0x550 [ 24.885816] ? prepare_exit_to_usermode+0x350/0x350 [ 24.890810] ? retint_user+0x18/0x18 [ 24.894504] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.899348] entry_SYSENTER_compat+0x54/0x63 [ 24.903738] RIP: 0023:0xf7fb1c79 [ 24.907078] RSP: 002b:00000000fff34edc EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 24.914775] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000002056a000 [ 24.922025] RDX: 00