[....] Starting enhanced syslogd: rsyslogd[ 15.716617] audit: type=1400 audit(1518433980.311:5): avc: denied { syslog } for pid=4006 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: [ 19.317888] audit: type=1400 audit(1518433983.912:6): avc: denied { map } for pid=4145 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program [ 25.623081] audit: type=1400 audit(1518433990.216:7): avc: denied { map } for pid=4159 comm="syzkaller936250" path="/root/syzkaller936250913" 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 [ 25.650542] [ 25.652434] ============================= [ 25.656718] WARNING: suspicious RCU usage [ 25.660922] 4.15.0+ #222 Not tainted [ 25.664664] ----------------------------- [ 25.668828] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.678105] [ 25.678105] other info that might help us debug this: [ 25.678105] [ 25.686258] [ 25.686258] rcu_scheduler_active = 2, debug_locks = 1 [ 25.692934] 1 lock held by syzkaller936250/4159: [ 25.697692] #0: (rcu_read_lock){....}, at: [<00000000c917d64b>] __rds_conn_create+0xe46/0x1b50 [ 25.706824] [ 25.706824] stack backtrace: [ 25.711328] CPU: 0 PID: 4159 Comm: syzkaller936250 Not tainted 4.15.0+ #222 [ 25.718407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.727741] Call Trace: [ 25.730306] dump_stack+0x194/0x257 [ 25.733913] ? arch_local_irq_restore+0x53/0x53 [ 25.738568] lockdep_rcu_suspicious+0x123/0x170 [ 25.743216] ___might_sleep+0x385/0x470 [ 25.747184] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.753042] ? __debug_object_init+0x235/0x1040 [ 25.757688] ? debug_mutex_init+0x1c/0x60 [ 25.761816] __might_sleep+0x95/0x190 [ 25.765597] kmem_cache_alloc_trace+0x299/0x740 [ 25.770243] ? lock_acquire+0x1d5/0x580 [ 25.774192] ? lock_acquire+0x1d5/0x580 [ 25.778148] ? __rds_conn_create+0xe46/0x1b50 [ 25.782624] rds_loop_conn_alloc+0xc8/0x380 [ 25.786925] ? rds_loop_conn_free+0x290/0x290 [ 25.791397] ? __init_waitqueue_head+0x97/0x140 [ 25.796053] ? rcutorture_record_progress+0x10/0x10 [ 25.801058] ? __lockdep_init_map+0xe4/0x650 [ 25.805445] __rds_conn_create+0x112f/0x1b50 [ 25.809850] ? rds_conn_drop+0xb0/0xb0 [ 25.813721] ? __raw_spin_lock_init+0x1c/0x100 [ 25.818285] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.823285] ? __lockdep_init_map+0xe4/0x650 [ 25.827678] ? lockdep_init_map+0x9/0x10 [ 25.831806] ? __init_waitqueue_head+0x97/0x140 [ 25.836450] ? init_wait_entry+0x1b0/0x1b0 [ 25.840667] ? lockdep_init_map+0x9/0x10 [ 25.844708] ? rds_message_alloc+0x28c/0x330 [ 25.849108] ? rds_message_next_extension+0x210/0x210 [ 25.854276] ? trace_hardirqs_on+0xd/0x10 [ 25.858419] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.862810] ? __release_sock+0x360/0x360 [ 25.866930] ? lock_sock_nested+0x91/0x110 [ 25.871148] rds_conn_create_outgoing+0x3f/0x50 [ 25.875795] rds_sendmsg+0xda3/0x2390 [ 25.879569] ? avc_has_perm+0x43e/0x680 [ 25.883535] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.888011] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.892491] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.897486] ? find_held_lock+0x35/0x1d0 [ 25.901532] ? sock_has_perm+0x2a4/0x420 [ 25.905572] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.910916] ? lock_release+0xa02/0xa40 [ 25.914867] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.920741] ? __check_object_size+0x8b/0x530 [ 25.925213] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.929692] ? __might_sleep+0x95/0x190 [ 25.933647] ? selinux_socket_sendmsg+0x36/0x40 [ 25.938293] ? security_socket_sendmsg+0x89/0xb0 [ 25.943025] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.947497] sock_sendmsg+0xca/0x110 [ 25.951190] SYSC_sendto+0x361/0x5c0 [ 25.954882] ? SYSC_connect+0x4a0/0x4a0 [ 25.958838] ? __do_page_fault+0x5f7/0xc90 [ 25.963053] ? lock_downgrade+0x980/0x980 [ 25.967183] ? handle_mm_fault+0x43b/0x970 [ 25.971407] ? up_read+0x1a/0x40 [ 25.974747] ? __do_page_fault+0x3d6/0xc90 [ 25.978973] ? mm_fault_error+0x2c0/0x2c0 [ 25.983101] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.988616] SyS_sendto+0x40/0x50 [ 25.992053] ? SyS_getpeername+0x30/0x30 [ 25.996099] do_syscall_64+0x282/0x940 [ 25.999962] ? __do_page_fault+0xc90/0xc90 [ 26.004181] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.009694] ? syscall_return_slowpath+0x550/0x550 [ 26.014598] ? syscall_return_slowpath+0x2ac/0x550 [ 26.019514] ? retint_user+0x18/0x18 [ 26.023210] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.028053] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.033226] RIP: 0033:0x43fd99 [ 26.036390] RSP: 002b:00007ffc786467f8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.044078] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.051329] RDX: 0000000000000000 RSI: 00000000200f7000 RDI: 0000000000000003 [ 26.058576] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.065820] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.073067] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.080366] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.087826] in_atomic(): 1, irqs_disabled(): 0, pid: 4159, name: syzkaller936250 [ 26.095379] 1 lock held by syzkaller936250/4159: [ 26.100140] #0: (rcu_read_lock){....}, at: [<00000000c917d64b>] __rds_conn_create+0xe46/0x1b50 [ 26.109110] CPU: 0 PID: 4159 Comm: syzkaller936250 Not tainted 4.15.0+ #222 [ 26.116191] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.125520] Call Trace: [ 26.128084] dump_stack+0x194/0x257 [ 26.131689] ? arch_local_irq_restore+0x53/0x53 [ 26.136334] ? print_lock+0x9f/0xa2 [ 26.139936] ? lockdep_print_held_locks+0xc4/0x130 [ 26.144850] ___might_sleep+0x2b2/0x470 [ 26.148801] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.154660] ? __debug_object_init+0x235/0x1040 [ 26.159305] ? debug_mutex_init+0x1c/0x60 [ 26.163433] __might_sleep+0x95/0x190 [ 26.167213] kmem_cache_alloc_trace+0x299/0x740 [ 26.171857] ? lock_acquire+0x1d5/0x580 [ 26.175807] ? lock_acquire+0x1d5/0x580 [ 26.179758] ? __rds_conn_create+0xe46/0x1b50 [ 26.184231] rds_loop_conn_alloc+0xc8/0x380 [ 26.188531] ? rds_loop_conn_free+0x290/0x290 [ 26.193003] ? __init_waitqueue_head+0x97/0x140 [ 26.197660] ? rcutorture_record_progress+0x10/0x10 [ 26.202652] ? __lockdep_init_map+0xe4/0x650 [ 26.207038] __rds_conn_create+0x112f/0x1b50 [ 26.211440] ? rds_conn_drop+0xb0/0xb0 [ 26.215314] ? __raw_spin_lock_init+0x1c/0x100 [ 26.219876] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.224877] ? __lockdep_init_map+0xe4/0x650 [ 26.229278] ? lockdep_init_map+0x9/0x10 [ 26.233317] ? __init_waitqueue_head+0x97/0x140 [ 26.237964] ? init_wait_entry+0x1b0/0x1b0 [ 26.242179] ? lockdep_init_map+0x9/0x10 [ 26.246220] ? rds_message_alloc+0x28c/0x330 [ 26.250605] ? rds_message_next_extension+0x210/0x210 [ 26.255768] ? trace_hardirqs_on+0xd/0x10 [ 26.259895] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.264292] ? __release_sock+0x360/0x360 [ 26.268414] ? lock_sock_nested+0x91/0x110 [ 26.272630] rds_conn_create_outgoing+0x3f/0x50 [ 26.277279] rds_sendmsg+0xda3/0x2390 [ 26.281064] ? avc_has_perm+0x43e/0x680 [ 26.285049] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.289535] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.294013] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.299011] ? find_held_lock+0x35/0x1d0 [ 26.303056] ? sock_has_perm+0x2a4/0x420 [ 26.307095] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.312433] ? lock_release+0xa02/0xa40 [ 26.316379] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.322261] ? __check_object_size+0x8b/0x530 [ 26.326738] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.331216] ? __might_sleep+0x95/0x190 [ 26.335169] ? selinux_socket_sendmsg+0x36/0x40 [ 26.339814] ? security_socket_sendmsg+0x89/0xb0 [ 26.344544] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.349022] sock_sendmsg+0xca/0x110 [ 26.352738] SYSC_sendto+0x361/0x5c0 [ 26.356429] ? SYSC_connect+0x4a0/0x4a0 [ 26.360385] ? __do_page_fault+0x5f7/0xc90 [ 26.364599] ? lock_downgrade+0x980/0x980 [ 26.368748] ? handle_mm_fault+0x43b/0x970 [ 26.372970] ? up_read+0x1a/0x40 [ 26.376310] ? __do_page_fault+0x3d6/0xc90 [ 26.380525] ? mm_fault_error+0x2c0/0x2c0 [ 26.384650] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.390166] SyS_sendto+0x40/0x50 [ 26.393595] ? SyS_getpeername+0x30/0x30 [ 26.397634] do_syscall_64+0x282/0x940 [ 26.401494] ? __do_page_fault+0xc90/0xc90 [ 26.405732] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.411244] ? syscall_return_slowpath+0x550/0x550 [ 26.416149] ? syscall_return_slowpath+0x2ac/0x550 [ 26.421067] ? retint_user+0x18/0x18 [ 26.424771] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.429599] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.434766] RIP: 0033:0x43fd99 [ 26.437933] RSP: 002b:00007ffc786467f8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.445617] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.452867] RDX: 0000000000000000 RSI: 00000000200f7000 RDI: 0000000000000003 [ 26.460111] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.467355] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.474608] R13: 0000