[....] Starting enhanced syslogd: rsyslogd[ 16.457224] audit: type=1400 audit(1518435012.208:5): avc: denied { syslog } for pid=4015 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 22.300393] audit: type=1400 audit(1518435018.050:6): avc: denied { map } for pid=4155 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 '10.128.0.19' (ECDSA) to the list of known hosts. executing program [ 28.564408] audit: type=1400 audit(1518435024.315:7): avc: denied { map } for pid=4169 comm="syzkaller850241" path="/root/syzkaller850241661" 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 [ 28.591630] [ 28.593358] ============================= [ 28.597599] WARNING: suspicious RCU usage [ 28.601772] 4.16.0-rc1+ #309 Not tainted [ 28.605836] ----------------------------- [ 28.610034] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.619306] [ 28.619306] other info that might help us debug this: [ 28.619306] [ 28.627468] [ 28.627468] rcu_scheduler_active = 2, debug_locks = 1 [ 28.634141] 1 lock held by syzkaller850241/4169: [ 28.638899] #0: (rcu_read_lock){....}, at: [<0000000015747daa>] __rds_conn_create+0xe46/0x1b50 [ 28.647858] [ 28.647858] stack backtrace: [ 28.652370] CPU: 0 PID: 4169 Comm: syzkaller850241 Not tainted 4.16.0-rc1+ #309 [ 28.659801] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.669130] Call Trace: [ 28.671701] dump_stack+0x194/0x257 [ 28.675306] ? arch_local_irq_restore+0x53/0x53 [ 28.679961] lockdep_rcu_suspicious+0x123/0x170 [ 28.684605] ___might_sleep+0x385/0x470 [ 28.689068] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.694929] ? __debug_object_init+0x235/0x1040 [ 28.699587] ? lock_acquire+0x1d5/0x580 [ 28.703536] ? debug_mutex_init+0x1c/0x60 [ 28.707661] __might_sleep+0x95/0x190 [ 28.711441] kmem_cache_alloc_trace+0x299/0x740 [ 28.716084] ? lock_acquire+0x1d5/0x580 [ 28.720035] ? lock_acquire+0x1d5/0x580 [ 28.723984] ? __rds_conn_create+0xe46/0x1b50 [ 28.728461] rds_loop_conn_alloc+0xc8/0x380 [ 28.732775] ? rds_loop_conn_free+0x290/0x290 [ 28.737246] ? __init_waitqueue_head+0x97/0x140 [ 28.741892] ? rcutorture_record_progress+0x10/0x10 [ 28.746882] ? __lockdep_init_map+0xe4/0x650 [ 28.751277] __rds_conn_create+0x112f/0x1b50 [ 28.755678] ? rds_conn_drop+0xb0/0xb0 [ 28.759550] ? __raw_spin_lock_init+0x1c/0x100 [ 28.764105] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.769100] ? __lockdep_init_map+0xe4/0x650 [ 28.773483] ? lockdep_init_map+0x9/0x10 [ 28.777515] ? __init_waitqueue_head+0x97/0x140 [ 28.782159] ? init_wait_entry+0x1b0/0x1b0 [ 28.786371] ? lockdep_init_map+0x9/0x10 [ 28.790408] ? rds_message_alloc+0x28c/0x330 [ 28.794789] ? rds_message_next_extension+0x210/0x210 [ 28.799951] ? trace_hardirqs_on+0xd/0x10 [ 28.804080] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.808467] ? __release_sock+0x360/0x360 [ 28.812586] ? lock_sock_nested+0x91/0x110 [ 28.816802] rds_conn_create_outgoing+0x3f/0x50 [ 28.821449] rds_sendmsg+0xda3/0x2390 [ 28.825224] ? avc_has_perm+0x43e/0x680 [ 28.829185] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.833656] ? lock_downgrade+0x980/0x980 [ 28.837796] ? find_held_lock+0x35/0x1d0 [ 28.841839] ? sock_has_perm+0x2a4/0x420 [ 28.845876] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.851210] ? lock_release+0xa22/0xa40 [ 28.855158] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.861022] ? __check_object_size+0x8b/0x530 [ 28.865501] ? __might_sleep+0x95/0x190 [ 28.869452] ? selinux_socket_sendmsg+0x36/0x40 [ 28.874096] ? security_socket_sendmsg+0x89/0xb0 [ 28.878826] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.883299] sock_sendmsg+0xca/0x110 [ 28.886989] SYSC_sendto+0x361/0x5c0 [ 28.890683] ? SYSC_connect+0x4a0/0x4a0 [ 28.894635] ? __do_page_fault+0x5f7/0xc90 [ 28.898845] ? lock_downgrade+0x980/0x980 [ 28.902978] ? handle_mm_fault+0x43b/0x970 [ 28.907206] ? schedule+0xf5/0x430 [ 28.910720] ? __schedule+0x2040/0x2040 [ 28.914665] ? __do_page_fault+0x3d6/0xc90 [ 28.918888] ? mm_fault_error+0x2c0/0x2c0 [ 28.923014] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.928536] SyS_sendto+0x40/0x50 [ 28.931963] ? SyS_getpeername+0x30/0x30 [ 28.936000] do_syscall_64+0x282/0x940 [ 28.939870] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.945380] ? syscall_return_slowpath+0x550/0x550 [ 28.950285] ? syscall_return_slowpath+0x2ac/0x550 [ 28.955191] ? retint_user+0x18/0x18 [ 28.958882] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.963708] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 28.968870] RIP: 0033:0x43fdb9 [ 28.972035] RSP: 002b:00007ffed4a297d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 28.979716] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 28.986959] RDX: 0000000000000000 RSI: 0000000020141fb9 RDI: 0000000000000003 [ 28.994202] RBP: 00000000006ca018 R08: 000000002069affb R09: 0000000000000010 [ 29.001445] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016e0 [ 29.008686] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 29.016036] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.023496] in_atomic(): 1, irqs_disabled(): 0, pid: 4169, name: syzkaller850241 [ 29.031044] 1 lock held by syzkaller850241/4169: [ 29.035807] #0: (rcu_read_lock){....}, at: [<0000000015747daa>] __rds_conn_create+0xe46/0x1b50 [ 29.044777] CPU: 0 PID: 4169 Comm: syzkaller850241 Not tainted 4.16.0-rc1+ #309 [ 29.052203] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.061530] Call Trace: [ 29.064097] dump_stack+0x194/0x257 [ 29.067699] ? arch_local_irq_restore+0x53/0x53 [ 29.072348] ? print_lock+0x9f/0xa2 [ 29.075949] ? lockdep_print_held_locks+0xc4/0x130 [ 29.080860] ___might_sleep+0x2b2/0x470 [ 29.084809] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.090667] ? __debug_object_init+0x235/0x1040 [ 29.095315] ? lock_acquire+0x1d5/0x580 [ 29.099264] ? debug_mutex_init+0x1c/0x60 [ 29.103391] __might_sleep+0x95/0x190 [ 29.107170] kmem_cache_alloc_trace+0x299/0x740 [ 29.111813] ? lock_acquire+0x1d5/0x580 [ 29.115775] ? lock_acquire+0x1d5/0x580 [ 29.119726] ? __rds_conn_create+0xe46/0x1b50 [ 29.124201] rds_loop_conn_alloc+0xc8/0x380 [ 29.128495] ? rds_loop_conn_free+0x290/0x290 [ 29.132966] ? __init_waitqueue_head+0x97/0x140 [ 29.137612] ? rcutorture_record_progress+0x10/0x10 [ 29.142603] ? __lockdep_init_map+0xe4/0x650 [ 29.146988] __rds_conn_create+0x112f/0x1b50 [ 29.151389] ? rds_conn_drop+0xb0/0xb0 [ 29.155258] ? __raw_spin_lock_init+0x1c/0x100 [ 29.159817] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.164810] ? __lockdep_init_map+0xe4/0x650 [ 29.169198] ? lockdep_init_map+0x9/0x10 [ 29.173233] ? __init_waitqueue_head+0x97/0x140 [ 29.177875] ? init_wait_entry+0x1b0/0x1b0 [ 29.182086] ? lockdep_init_map+0x9/0x10 [ 29.186124] ? rds_message_alloc+0x28c/0x330 [ 29.190506] ? rds_message_next_extension+0x210/0x210 [ 29.195665] ? trace_hardirqs_on+0xd/0x10 [ 29.199804] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.204191] ? __release_sock+0x360/0x360 [ 29.208309] ? lock_sock_nested+0x91/0x110 [ 29.212520] rds_conn_create_outgoing+0x3f/0x50 [ 29.217163] rds_sendmsg+0xda3/0x2390 [ 29.220935] ? avc_has_perm+0x43e/0x680 [ 29.224896] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.229366] ? lock_downgrade+0x980/0x980 [ 29.233494] ? find_held_lock+0x35/0x1d0 [ 29.237539] ? sock_has_perm+0x2a4/0x420 [ 29.241579] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.246915] ? lock_release+0xa22/0xa40 [ 29.250862] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.256720] ? __check_object_size+0x8b/0x530 [ 29.261196] ? __might_sleep+0x95/0x190 [ 29.265147] ? selinux_socket_sendmsg+0x36/0x40 [ 29.269789] ? security_socket_sendmsg+0x89/0xb0 [ 29.274518] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.278989] sock_sendmsg+0xca/0x110 [ 29.282679] SYSC_sendto+0x361/0x5c0 [ 29.286380] ? SYSC_connect+0x4a0/0x4a0 [ 29.290335] ? __do_page_fault+0x5f7/0xc90 [ 29.294544] ? lock_downgrade+0x980/0x980 [ 29.298675] ? handle_mm_fault+0x43b/0x970 [ 29.302894] ? schedule+0xf5/0x430 [ 29.306418] ? __schedule+0x2040/0x2040 [ 29.310364] ? __do_page_fault+0x3d6/0xc90 [ 29.314577] ? mm_fault_error+0x2c0/0x2c0 [ 29.318700] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.324214] SyS_sendto+0x40/0x50 [ 29.327642] ? SyS_getpeername+0x30/0x30 [ 29.331676] do_syscall_64+0x282/0x940 [ 29.335543] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.341060] ? syscall_return_slowpath+0x550/0x550 [ 29.345962] ? syscall_return_slowpath+0x2ac/0x550 [ 29.350868] ? retint_user+0x18/0x18 [ 29.354561] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.359382] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.364554] RIP: 0033:0x43fdb9 [