[....] Starting enhanced syslogd: rsyslogd[ 16.492793] audit: type=1400 audit(1518417451.934:5): avc: denied { syslog } for pid=4008 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: [ 22.848096] audit: type=1400 audit(1518417458.289:6): avc: denied { map } for pid=4147 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 '10.128.15.197' (ECDSA) to the list of known hosts. executing program [ 29.147664] audit: type=1400 audit(1518417464.589:7): avc: denied { map } for pid=4161 comm="syzkaller731753" path="/root/syzkaller731753261" 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 [ 29.174559] [ 29.176249] ============================= [ 29.180408] WARNING: suspicious RCU usage [ 29.184563] 4.16.0-rc1+ #309 Not tainted [ 29.188645] ----------------------------- [ 29.192812] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 29.202081] [ 29.202081] other info that might help us debug this: [ 29.202081] [ 29.210235] [ 29.210235] rcu_scheduler_active = 2, debug_locks = 1 [ 29.216911] 1 lock held by syzkaller731753/4161: [ 29.221670] #0: (rcu_read_lock){....}, at: [<0000000042cdc96e>] __rds_conn_create+0xe46/0x1b50 [ 29.230625] [ 29.230625] stack backtrace: [ 29.235143] CPU: 1 PID: 4161 Comm: syzkaller731753 Not tainted 4.16.0-rc1+ #309 [ 29.242576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.251912] Call Trace: [ 29.254478] dump_stack+0x194/0x257 [ 29.258086] ? arch_local_irq_restore+0x53/0x53 [ 29.262742] lockdep_rcu_suspicious+0x123/0x170 [ 29.267388] ___might_sleep+0x385/0x470 [ 29.271337] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.277194] ? __debug_object_init+0x235/0x1040 [ 29.281841] ? debug_mutex_init+0x1c/0x60 [ 29.285966] __might_sleep+0x95/0x190 [ 29.289743] kmem_cache_alloc_trace+0x299/0x740 [ 29.294386] ? lock_acquire+0x1d5/0x580 [ 29.298333] ? lock_acquire+0x1d5/0x580 [ 29.302285] ? __rds_conn_create+0xe46/0x1b50 [ 29.306759] rds_loop_conn_alloc+0xc8/0x380 [ 29.311054] ? rds_loop_conn_free+0x290/0x290 [ 29.315528] ? __init_waitqueue_head+0x97/0x140 [ 29.320175] ? rcutorture_record_progress+0x10/0x10 [ 29.325167] ? __lockdep_init_map+0xe4/0x650 [ 29.329556] __rds_conn_create+0x112f/0x1b50 [ 29.333960] ? rds_conn_drop+0xb0/0xb0 [ 29.337831] ? __raw_spin_lock_init+0x1c/0x100 [ 29.342392] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.347388] ? __lockdep_init_map+0xe4/0x650 [ 29.351773] ? lockdep_init_map+0x9/0x10 [ 29.355808] ? __init_waitqueue_head+0x97/0x140 [ 29.360453] ? init_wait_entry+0x1b0/0x1b0 [ 29.364666] ? lockdep_init_map+0x9/0x10 [ 29.368704] ? rds_message_alloc+0x28c/0x330 [ 29.373088] ? rds_message_next_extension+0x210/0x210 [ 29.378248] ? trace_hardirqs_on+0xd/0x10 [ 29.382375] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.386759] ? __release_sock+0x360/0x360 [ 29.390876] ? lock_sock_nested+0x91/0x110 [ 29.395093] rds_conn_create_outgoing+0x3f/0x50 [ 29.399741] rds_sendmsg+0xda3/0x2390 [ 29.403517] ? avc_has_perm+0x43e/0x680 [ 29.407478] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.411949] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.416422] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.421440] ? find_held_lock+0x35/0x1d0 [ 29.425483] ? sock_has_perm+0x2a4/0x420 [ 29.429521] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.434859] ? lock_release+0xa22/0xa40 [ 29.438804] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.444669] ? __check_object_size+0x8b/0x530 [ 29.449137] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.453611] ? __might_sleep+0x95/0x190 [ 29.457564] ? selinux_socket_sendmsg+0x36/0x40 [ 29.462210] ? security_socket_sendmsg+0x89/0xb0 [ 29.466961] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.471433] sock_sendmsg+0xca/0x110 [ 29.475124] SYSC_sendto+0x361/0x5c0 [ 29.478816] ? SYSC_connect+0x4a0/0x4a0 [ 29.482769] ? __do_page_fault+0x5f7/0xc90 [ 29.486984] ? lock_downgrade+0x980/0x980 [ 29.491113] ? handle_mm_fault+0x43b/0x970 [ 29.495332] ? up_read+0x1a/0x40 [ 29.498682] ? __do_page_fault+0x3d6/0xc90 [ 29.502898] ? mm_fault_error+0x2c0/0x2c0 [ 29.507026] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.512542] SyS_sendto+0x40/0x50 [ 29.515967] ? SyS_getpeername+0x30/0x30 [ 29.520005] do_syscall_64+0x282/0x940 [ 29.523876] ? __do_page_fault+0xc90/0xc90 [ 29.528092] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.532826] ? syscall_return_slowpath+0x550/0x550 [ 29.537729] ? syscall_return_slowpath+0x2ac/0x550 [ 29.542639] ? prepare_exit_to_usermode+0x350/0x350 [ 29.547630] ? retint_user+0x18/0x18 [ 29.551488] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.556316] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.561480] RIP: 0033:0x43fd99 [ 29.564641] RSP: 002b:00007ffc29f84eb8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.572322] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 29.579564] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 29.586806] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 29.594047] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 29.601289] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 29.608586] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.616040] in_atomic(): 1, irqs_disabled(): 0, pid: 4161, name: syzkaller731753 [ 29.623579] 1 lock held by syzkaller731753/4161: [ 29.628332] #0: (rcu_read_lock){....}, at: [<0000000042cdc96e>] __rds_conn_create+0xe46/0x1b50 [ 29.637286] CPU: 1 PID: 4161 Comm: syzkaller731753 Not tainted 4.16.0-rc1+ #309 [ 29.644713] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.654038] Call Trace: [ 29.656601] dump_stack+0x194/0x257 [ 29.660206] ? arch_local_irq_restore+0x53/0x53 [ 29.664935] ? print_lock+0x9f/0xa2 [ 29.668539] ? lockdep_print_held_locks+0xc4/0x130 [ 29.673447] ___might_sleep+0x2b2/0x470 [ 29.677394] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.683248] ? __debug_object_init+0x235/0x1040 [ 29.687889] ? debug_mutex_init+0x1c/0x60 [ 29.692014] __might_sleep+0x95/0x190 [ 29.695794] kmem_cache_alloc_trace+0x299/0x740 [ 29.700437] ? lock_acquire+0x1d5/0x580 [ 29.704385] ? lock_acquire+0x1d5/0x580 [ 29.708331] ? __rds_conn_create+0xe46/0x1b50 [ 29.712805] rds_loop_conn_alloc+0xc8/0x380 [ 29.717103] ? rds_loop_conn_free+0x290/0x290 [ 29.721573] ? __init_waitqueue_head+0x97/0x140 [ 29.726229] ? rcutorture_record_progress+0x10/0x10 [ 29.731220] ? __lockdep_init_map+0xe4/0x650 [ 29.735607] __rds_conn_create+0x112f/0x1b50 [ 29.740008] ? rds_conn_drop+0xb0/0xb0 [ 29.743880] ? __raw_spin_lock_init+0x1c/0x100 [ 29.748438] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.753433] ? __lockdep_init_map+0xe4/0x650 [ 29.757818] ? lockdep_init_map+0x9/0x10 [ 29.761851] ? __init_waitqueue_head+0x97/0x140 [ 29.766515] ? init_wait_entry+0x1b0/0x1b0 [ 29.770728] ? lockdep_init_map+0x9/0x10 [ 29.774766] ? rds_message_alloc+0x28c/0x330 [ 29.779147] ? rds_message_next_extension+0x210/0x210 [ 29.784305] ? trace_hardirqs_on+0xd/0x10 [ 29.788431] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.792816] ? __release_sock+0x360/0x360 [ 29.796935] ? lock_sock_nested+0x91/0x110 [ 29.801150] rds_conn_create_outgoing+0x3f/0x50 [ 29.805795] rds_sendmsg+0xda3/0x2390 [ 29.809568] ? avc_has_perm+0x43e/0x680 [ 29.813532] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.818011] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.822493] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.827519] ? find_held_lock+0x35/0x1d0 [ 29.831565] ? sock_has_perm+0x2a4/0x420 [ 29.835604] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.840939] ? lock_release+0xa22/0xa40 [ 29.844898] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.850757] ? __check_object_size+0x8b/0x530 [ 29.855227] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.859701] ? __might_sleep+0x95/0x190 [ 29.863655] ? selinux_socket_sendmsg+0x36/0x40 [ 29.868299] ? security_socket_sendmsg+0x89/0xb0 [ 29.873036] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.877517] sock_sendmsg+0xca/0x110 [ 29.881209] SYSC_sendto+0x361/0x5c0 [ 29.884907] ? SYSC_connect+0x4a0/0x4a0 [ 29.888859] ? __do_page_fault+0x5f7/0xc90 [ 29.893078] ? lock_downgrade+0x980/0x980 [ 29.897209] ? handle_mm_fault+0x43b/0x970 [ 29.901428] ? up_read+0x1a/0x40 [ 29.904766] ? __do_page_fault+0x3d6/0xc90 [ 29.908980] ? mm_fault_error+0x2c0/0x2c0 [ 29.913104] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.918619] SyS_sendto+0x40/0x50 [ 29.922056] ? SyS_getpeername+0x30/0x30 [ 29.926093] do_syscall_64+0x282/0x940 [ 29.929954] ? __do_page_fault+0xc90/0xc90 [ 29.934162] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.938894] ? syscall_return_slowpath+0x550/0x550 [ 29.943796] ? syscall_return_slowpath+0x2ac/0x550 [ 29.948699] ? prepare_exit_to_usermode+0x350/0x350 [ 29.953689] ? retint_user+0x18/0x18 [ 29.957380] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.962201] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.967364] RIP: 0033:0x43fd99 [ 29.970527] RSP: 002b:00007ffc29f84eb8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.978207] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 29.985448] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 29.992709] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 29.999954] R