[....] Starting enhanced syslogd: rsyslogd[ 15.910613] audit: type=1400 audit(1518364914.208:5): avc: denied { syslog } for pid=4014 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: [ 20.964848] audit: type=1400 audit(1518364919.262:6): avc: denied { map } for pid=4153 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 '10.128.0.43' (ECDSA) to the list of known hosts. executing program [ 27.248890] audit: type=1400 audit(1518364925.546:7): avc: denied { map } for pid=4167 comm="syzkaller347371" path="/root/syzkaller347371844" 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 [ 27.276283] [ 27.277968] ============================= [ 27.282243] WARNING: suspicious RCU usage [ 27.286399] 4.15.0+ #222 Not tainted [ 27.290113] ----------------------------- [ 27.294259] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 27.303526] [ 27.303526] other info that might help us debug this: [ 27.303526] [ 27.311676] [ 27.311676] rcu_scheduler_active = 2, debug_locks = 1 [ 27.318346] 1 lock held by syzkaller347371/4167: [ 27.323100] #0: (rcu_read_lock){....}, at: [<0000000000129564>] __rds_conn_create+0xe46/0x1b50 [ 27.332050] [ 27.332050] stack backtrace: [ 27.336548] CPU: 1 PID: 4167 Comm: syzkaller347371 Not tainted 4.15.0+ #222 [ 27.343618] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.352940] Call Trace: [ 27.355500] dump_stack+0x194/0x257 [ 27.359102] ? arch_local_irq_restore+0x53/0x53 [ 27.363755] lockdep_rcu_suspicious+0x123/0x170 [ 27.368400] ___might_sleep+0x385/0x470 [ 27.372345] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.378198] ? __debug_object_init+0x235/0x1040 [ 27.382842] ? debug_mutex_init+0x1c/0x60 [ 27.386967] __might_sleep+0x95/0x190 [ 27.390746] kmem_cache_alloc_trace+0x299/0x740 [ 27.395387] ? lock_acquire+0x1d5/0x580 [ 27.399333] ? lock_acquire+0x1d5/0x580 [ 27.403278] ? __rds_conn_create+0xe46/0x1b50 [ 27.407749] rds_loop_conn_alloc+0xc8/0x380 [ 27.412042] ? rds_loop_conn_free+0x290/0x290 [ 27.416511] ? __init_waitqueue_head+0x97/0x140 [ 27.421154] ? rcutorture_record_progress+0x10/0x10 [ 27.426143] ? __lockdep_init_map+0xe4/0x650 [ 27.430526] __rds_conn_create+0x112f/0x1b50 [ 27.434922] ? rds_conn_drop+0xb0/0xb0 [ 27.438790] ? __raw_spin_lock_init+0x1c/0x100 [ 27.443343] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.448339] ? __lockdep_init_map+0xe4/0x650 [ 27.452724] ? lockdep_init_map+0x9/0x10 [ 27.456757] ? __init_waitqueue_head+0x97/0x140 [ 27.461404] ? init_wait_entry+0x1b0/0x1b0 [ 27.465614] ? lockdep_init_map+0x9/0x10 [ 27.469649] ? rds_message_alloc+0x28c/0x330 [ 27.474034] ? rds_message_next_extension+0x210/0x210 [ 27.479192] ? trace_hardirqs_on+0xd/0x10 [ 27.483317] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.487703] ? __release_sock+0x360/0x360 [ 27.491819] ? lock_sock_nested+0x91/0x110 [ 27.496039] rds_conn_create_outgoing+0x3f/0x50 [ 27.500684] rds_sendmsg+0xda3/0x2390 [ 27.504454] ? avc_has_perm+0x43e/0x680 [ 27.508414] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.512877] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.517345] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.522335] ? find_held_lock+0x35/0x1d0 [ 27.526383] ? sock_has_perm+0x2a4/0x420 [ 27.530418] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.535751] ? lock_release+0xa02/0xa40 [ 27.539697] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.545551] ? __check_object_size+0x8b/0x530 [ 27.550024] ? __handle_mm_fault+0x80e/0x3ce0 [ 27.554498] ? __might_sleep+0x95/0x190 [ 27.558447] ? selinux_socket_sendmsg+0x36/0x40 [ 27.563086] ? security_socket_sendmsg+0x89/0xb0 [ 27.567812] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.572281] sock_sendmsg+0xca/0x110 [ 27.575970] SYSC_sendto+0x361/0x5c0 [ 27.579661] ? SYSC_connect+0x4a0/0x4a0 [ 27.583613] ? __do_page_fault+0x5f7/0xc90 [ 27.587819] ? lock_downgrade+0x980/0x980 [ 27.591944] ? handle_mm_fault+0x43b/0x970 [ 27.596162] ? up_read+0x1a/0x40 [ 27.599502] ? __do_page_fault+0x3d6/0xc90 [ 27.603715] ? mm_fault_error+0x2c0/0x2c0 [ 27.607836] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.613350] SyS_sendto+0x40/0x50 [ 27.616774] ? SyS_getpeername+0x30/0x30 [ 27.620810] do_syscall_64+0x282/0x940 [ 27.624669] ? __do_page_fault+0xc90/0xc90 [ 27.628874] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.633602] ? syscall_return_slowpath+0x550/0x550 [ 27.638505] ? syscall_return_slowpath+0x2ac/0x550 [ 27.643405] ? prepare_exit_to_usermode+0x350/0x350 [ 27.648393] ? retint_user+0x18/0x18 [ 27.652082] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.656900] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 27.662059] RIP: 0033:0x43fd99 [ 27.665218] RSP: 002b:00007fff4f12b4d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 27.672894] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 27.680135] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 27.687374] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 27.694616] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 27.701858] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 27.709180] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 27.716639] in_atomic(): 1, irqs_disabled(): 0, pid: 4167, name: syzkaller347371 [ 27.724179] 1 lock held by syzkaller347371/4167: [ 27.728933] #0: (rcu_read_lock){....}, at: [<0000000000129564>] __rds_conn_create+0xe46/0x1b50 [ 27.737886] CPU: 1 PID: 4167 Comm: syzkaller347371 Not tainted 4.15.0+ #222 [ 27.744978] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.754302] Call Trace: [ 27.756861] dump_stack+0x194/0x257 [ 27.760460] ? arch_local_irq_restore+0x53/0x53 [ 27.765103] ? print_lock+0x9f/0xa2 [ 27.768700] ? lockdep_print_held_locks+0xc4/0x130 [ 27.773608] ___might_sleep+0x2b2/0x470 [ 27.777554] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.783410] ? __debug_object_init+0x235/0x1040 [ 27.788051] ? debug_mutex_init+0x1c/0x60 [ 27.792172] __might_sleep+0x95/0x190 [ 27.795949] kmem_cache_alloc_trace+0x299/0x740 [ 27.800591] ? lock_acquire+0x1d5/0x580 [ 27.804536] ? lock_acquire+0x1d5/0x580 [ 27.808481] ? __rds_conn_create+0xe46/0x1b50 [ 27.812955] rds_loop_conn_alloc+0xc8/0x380 [ 27.817247] ? rds_loop_conn_free+0x290/0x290 [ 27.821716] ? __init_waitqueue_head+0x97/0x140 [ 27.826359] ? rcutorture_record_progress+0x10/0x10 [ 27.831349] ? __lockdep_init_map+0xe4/0x650 [ 27.835732] __rds_conn_create+0x112f/0x1b50 [ 27.840129] ? rds_conn_drop+0xb0/0xb0 [ 27.843997] ? __raw_spin_lock_init+0x1c/0x100 [ 27.848557] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.853550] ? __lockdep_init_map+0xe4/0x650 [ 27.857931] ? lockdep_init_map+0x9/0x10 [ 27.861962] ? __init_waitqueue_head+0x97/0x140 [ 27.866602] ? init_wait_entry+0x1b0/0x1b0 [ 27.870812] ? lockdep_init_map+0x9/0x10 [ 27.874846] ? rds_message_alloc+0x28c/0x330 [ 27.879228] ? rds_message_next_extension+0x210/0x210 [ 27.884386] ? trace_hardirqs_on+0xd/0x10 [ 27.888509] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.892892] ? __release_sock+0x360/0x360 [ 27.897015] ? lock_sock_nested+0x91/0x110 [ 27.901230] rds_conn_create_outgoing+0x3f/0x50 [ 27.905875] rds_sendmsg+0xda3/0x2390 [ 27.909648] ? avc_has_perm+0x43e/0x680 [ 27.913609] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.918074] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.922546] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.927537] ? find_held_lock+0x35/0x1d0 [ 27.931586] ? sock_has_perm+0x2a4/0x420 [ 27.935623] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.940956] ? lock_release+0xa02/0xa40 [ 27.944904] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.950760] ? __check_object_size+0x8b/0x530 [ 27.955228] ? __handle_mm_fault+0x80e/0x3ce0 [ 27.959699] ? __might_sleep+0x95/0x190 [ 27.963648] ? selinux_socket_sendmsg+0x36/0x40 [ 27.968290] ? security_socket_sendmsg+0x89/0xb0 [ 27.973022] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.977492] sock_sendmsg+0xca/0x110 [ 27.981180] SYSC_sendto+0x361/0x5c0 [ 27.984871] ? SYSC_connect+0x4a0/0x4a0 [ 27.988824] ? __do_page_fault+0x5f7/0xc90 [ 27.993037] ? lock_downgrade+0x980/0x980 [ 27.997162] ? handle_mm_fault+0x43b/0x970 [ 28.001379] ? up_read+0x1a/0x40 [ 28.004719] ? __do_page_fault+0x3d6/0xc90 [ 28.008931] ? mm_fault_error+0x2c0/0x2c0 [ 28.013051] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.018563] SyS_sendto+0x40/0x50 [ 28.021988] ? SyS_getpeername+0x30/0x30 [ 28.026032] do_syscall_64+0x282/0x940 [ 28.029890] ? __do_page_fault+0xc90/0xc90 [ 28.034097] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.038827] ? syscall_return_slowpath+0x550/0x550 [ 28.043728] ? syscall_return_slowpath+0x2ac/0x550 [ 28.048628] ? prepare_exit_to_usermode+0x350/0x350 [ 28.053616] ? retint_user+0x18/0x18 [ 28.057305] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.062128] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 28.067289] RIP: 0033:0x43fd99 [ 28.070451] RSP: 002b:00007fff4f12b4d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 28.078130] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 28.085368] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 28.092606] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 28.099849] R10: 0000000000000