[....] Starting enhanced syslogd: rsyslogd[ 15.298672] audit: type=1400 audit(1518360355.172:5): avc: denied { syslog } for pid=3962 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: [ 18.147673] audit: type=1400 audit(1518360358.021:6): avc: denied { map } for pid=4103 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 '10.128.15.215' (ECDSA) to the list of known hosts. executing program [ 27.207894] audit: type=1400 audit(1518360367.081:7): avc: denied { map } for pid=4118 comm="syzkaller323956" path="/root/syzkaller323956046" 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 [ 27.234918] [ 27.236606] ============================= [ 27.240761] WARNING: suspicious RCU usage [ 27.244908] 4.15.0+ #218 Not tainted [ 27.248621] ----------------------------- [ 27.252775] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 27.262055] [ 27.262055] other info that might help us debug this: [ 27.262055] [ 27.270212] [ 27.270212] rcu_scheduler_active = 2, debug_locks = 1 [ 27.276891] 1 lock held by syzkaller323956/4118: [ 27.281651] #0: (rcu_read_lock){....}, at: [<000000002a65e623>] __rds_conn_create+0xe46/0x1b50 [ 27.290602] [ 27.290602] stack backtrace: [ 27.295111] CPU: 0 PID: 4118 Comm: syzkaller323956 Not tainted 4.15.0+ #218 [ 27.302188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.311513] Call Trace: [ 27.314075] dump_stack+0x194/0x257 [ 27.317680] ? arch_local_irq_restore+0x53/0x53 [ 27.322335] lockdep_rcu_suspicious+0x123/0x170 [ 27.326981] ___might_sleep+0x385/0x470 [ 27.330928] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.336783] ? __debug_object_init+0x235/0x1040 [ 27.341425] ? debug_mutex_init+0x1c/0x60 [ 27.345549] __might_sleep+0x95/0x190 [ 27.349328] kmem_cache_alloc_trace+0x299/0x740 [ 27.353972] ? lock_acquire+0x1d5/0x580 [ 27.357917] ? lock_acquire+0x1d5/0x580 [ 27.361864] ? __rds_conn_create+0xe46/0x1b50 [ 27.366334] rds_loop_conn_alloc+0xc8/0x380 [ 27.370628] ? rds_loop_conn_free+0x290/0x290 [ 27.375096] ? __init_waitqueue_head+0x97/0x140 [ 27.379741] ? rcutorture_record_progress+0x10/0x10 [ 27.384731] ? __lockdep_init_map+0xe4/0x650 [ 27.389119] __rds_conn_create+0x112f/0x1b50 [ 27.393520] ? rds_conn_drop+0xb0/0xb0 [ 27.397391] ? __raw_spin_lock_init+0x1c/0x100 [ 27.401949] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.406948] ? __lockdep_init_map+0xe4/0x650 [ 27.411678] ? lockdep_init_map+0x9/0x10 [ 27.415710] ? __init_waitqueue_head+0x97/0x140 [ 27.420361] ? init_wait_entry+0x1b0/0x1b0 [ 27.424573] ? lockdep_init_map+0x9/0x10 [ 27.428614] ? rds_message_alloc+0x28c/0x330 [ 27.432998] ? rds_message_next_extension+0x210/0x210 [ 27.438163] ? trace_hardirqs_on+0xd/0x10 [ 27.442290] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.447150] ? __release_sock+0x360/0x360 [ 27.451270] ? lock_sock_nested+0x91/0x110 [ 27.455486] rds_conn_create_outgoing+0x3f/0x50 [ 27.460135] rds_sendmsg+0xda3/0x2390 [ 27.463905] ? avc_has_perm+0x43e/0x680 [ 27.467872] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.472341] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.476812] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.481807] ? find_held_lock+0x35/0x1d0 [ 27.485855] ? sock_has_perm+0x2a4/0x420 [ 27.489896] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.495248] ? lock_release+0xa22/0xa40 [ 27.499198] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.505056] ? __check_object_size+0x8b/0x530 [ 27.509535] ? __might_sleep+0x95/0x190 [ 27.513494] ? selinux_socket_sendmsg+0x36/0x40 [ 27.518136] ? security_socket_sendmsg+0x89/0xb0 [ 27.522865] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.527335] sock_sendmsg+0xca/0x110 [ 27.531028] SYSC_sendto+0x361/0x5c0 [ 27.534718] ? SYSC_connect+0x4a0/0x4a0 [ 27.538667] ? find_held_lock+0x35/0x1d0 [ 27.542709] ? lock_downgrade+0x980/0x980 [ 27.546852] ? up_read+0x1a/0x40 [ 27.550197] ? __do_page_fault+0x3d6/0xc90 [ 27.554419] SyS_sendto+0x40/0x50 [ 27.557858] ? SyS_getpeername+0x30/0x30 [ 27.561893] do_fast_syscall_32+0x3ee/0xfa1 [ 27.566196] ? do_int80_syscall_32+0x9d0/0x9d0 [ 27.570750] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.575479] ? syscall_return_slowpath+0x550/0x550 [ 27.580383] ? syscall_return_slowpath+0x2ac/0x550 [ 27.585292] ? prepare_exit_to_usermode+0x350/0x350 [ 27.590285] ? retint_user+0x18/0x18 [ 27.593977] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.598800] entry_SYSENTER_compat+0x54/0x63 [ 27.603179] RIP: 0023:0xf7f73c79 [ 27.606516] RSP: 002b:00000000ffaafa1c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 27.614195] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 27.621438] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020af3ff0 [ 27.628678] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 27.635920] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 27.643161] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.650648] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 27.658119] in_atomic(): 1, irqs_disabled(): 0, pid: 4118, name: syzkaller323956 [ 27.665664] 1 lock held by syzkaller323956/4118: [ 27.670421] #0: (rcu_read_lock){....}, at: [<000000002a65e623>] __rds_conn_create+0xe46/0x1b50 [ 27.679377] CPU: 0 PID: 4118 Comm: syzkaller323956 Not tainted 4.15.0+ #218 [ 27.686455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.695781] Call Trace: [ 27.698341] dump_stack+0x194/0x257 [ 27.701942] ? arch_local_irq_restore+0x53/0x53 [ 27.706588] ? print_lock+0x9f/0xa2 [ 27.710186] ? lockdep_print_held_locks+0xc4/0x130 [ 27.715102] ___might_sleep+0x2b2/0x470 [ 27.719057] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.724922] ? __debug_object_init+0x235/0x1040 [ 27.729569] ? debug_mutex_init+0x1c/0x60 [ 27.733694] __might_sleep+0x95/0x190 [ 27.737471] kmem_cache_alloc_trace+0x299/0x740 [ 27.742118] ? lock_acquire+0x1d5/0x580 [ 27.746066] ? lock_acquire+0x1d5/0x580 [ 27.750029] ? __rds_conn_create+0xe46/0x1b50 [ 27.754504] rds_loop_conn_alloc+0xc8/0x380 [ 27.758800] ? rds_loop_conn_free+0x290/0x290 [ 27.763270] ? __init_waitqueue_head+0x97/0x140 [ 27.767917] ? rcutorture_record_progress+0x10/0x10 [ 27.772909] ? __lockdep_init_map+0xe4/0x650 [ 27.777297] __rds_conn_create+0x112f/0x1b50 [ 27.781695] ? rds_conn_drop+0xb0/0xb0 [ 27.785564] ? __raw_spin_lock_init+0x1c/0x100 [ 27.790123] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.795117] ? __lockdep_init_map+0xe4/0x650 [ 27.799499] ? lockdep_init_map+0x9/0x10 [ 27.803531] ? __init_waitqueue_head+0x97/0x140 [ 27.808173] ? init_wait_entry+0x1b0/0x1b0 [ 27.812387] ? lockdep_init_map+0x9/0x10 [ 27.816424] ? rds_message_alloc+0x28c/0x330 [ 27.820804] ? rds_message_next_extension+0x210/0x210 [ 27.825964] ? trace_hardirqs_on+0xd/0x10 [ 27.830090] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.834476] ? __release_sock+0x360/0x360 [ 27.838596] ? lock_sock_nested+0x91/0x110 [ 27.842806] rds_conn_create_outgoing+0x3f/0x50 [ 27.847450] rds_sendmsg+0xda3/0x2390 [ 27.851220] ? avc_has_perm+0x43e/0x680 [ 27.855179] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.859646] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.864132] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.869127] ? find_held_lock+0x35/0x1d0 [ 27.873168] ? sock_has_perm+0x2a4/0x420 [ 27.877202] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.882538] ? lock_release+0xa22/0xa40 [ 27.886485] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.892344] ? __check_object_size+0x8b/0x530 [ 27.896820] ? __might_sleep+0x95/0x190 [ 27.900774] ? selinux_socket_sendmsg+0x36/0x40 [ 27.905417] ? security_socket_sendmsg+0x89/0xb0 [ 27.910147] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.914617] sock_sendmsg+0xca/0x110 [ 27.918305] SYSC_sendto+0x361/0x5c0 [ 27.921993] ? SYSC_connect+0x4a0/0x4a0 [ 27.925943] ? find_held_lock+0x35/0x1d0 [ 27.929987] ? lock_downgrade+0x980/0x980 [ 27.934129] ? up_read+0x1a/0x40 [ 27.937469] ? __do_page_fault+0x3d6/0xc90 [ 27.941687] SyS_sendto+0x40/0x50 [ 27.945117] ? SyS_getpeername+0x30/0x30 [ 27.949155] do_fast_syscall_32+0x3ee/0xfa1 [ 27.953454] ? do_int80_syscall_32+0x9d0/0x9d0 [ 27.958010] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.962741] ? syscall_return_slowpath+0x550/0x550 [ 27.967645] ? syscall_return_slowpath+0x2ac/0x550 [ 27.972547] ? prepare_exit_to_usermode+0x350/0x350 [ 27.977540] ? retint_user+0x18/0x18 [ 27.981229] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.986051] entry_SYSENTER_compat+0x54/0x63 [ 27.990429] RIP: 0023:0xf7f73c79 [ 27.993769] RSP: 002b:00000000ffaafa1c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 28.001446] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 28.008687] RDX: 00000000000