[....] Starting enhanced syslogd: rsyslogd[ 16.466052] audit: type=1400 audit(1518419595.367:5): avc: denied { syslog } for pid=4027 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: [ 19.498483] audit: type=1400 audit(1518419598.400:6): avc: denied { map } for pid=4167 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 '10.128.0.27' (ECDSA) to the list of known hosts. executing program [ 25.737446] audit: type=1400 audit(1518419604.639:7): avc: denied { map } for pid=4181 comm="syzkaller547749" path="/root/syzkaller547749441" 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 [ 25.764465] [ 25.766184] ============================= [ 25.770419] WARNING: suspicious RCU usage [ 25.774575] 4.15.0+ #222 Not tainted [ 25.778311] ----------------------------- [ 25.782485] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.791756] [ 25.791756] other info that might help us debug this: [ 25.791756] [ 25.799905] [ 25.799905] rcu_scheduler_active = 2, debug_locks = 1 [ 25.806578] 1 lock held by syzkaller547749/4181: [ 25.811338] #0: (rcu_read_lock){....}, at: [<000000007dfb54d7>] __rds_conn_create+0xe46/0x1b50 [ 25.820289] [ 25.820289] stack backtrace: [ 25.824798] CPU: 0 PID: 4181 Comm: syzkaller547749 Not tainted 4.15.0+ #222 [ 25.831883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.841218] Call Trace: [ 25.843785] dump_stack+0x194/0x257 [ 25.847390] ? arch_local_irq_restore+0x53/0x53 [ 25.852044] lockdep_rcu_suspicious+0x123/0x170 [ 25.856690] ___might_sleep+0x385/0x470 [ 25.860642] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.866499] ? __debug_object_init+0x235/0x1040 [ 25.871155] ? debug_mutex_init+0x1c/0x60 [ 25.875280] __might_sleep+0x95/0x190 [ 25.879065] kmem_cache_alloc_trace+0x299/0x740 [ 25.883727] ? lock_acquire+0x1d5/0x580 [ 25.887691] ? lock_acquire+0x1d5/0x580 [ 25.891648] ? __rds_conn_create+0xe46/0x1b50 [ 25.896139] rds_loop_conn_alloc+0xc8/0x380 [ 25.900440] ? rds_loop_conn_free+0x290/0x290 [ 25.904924] ? __init_waitqueue_head+0x97/0x140 [ 25.909581] ? rcutorture_record_progress+0x10/0x10 [ 25.914585] ? __lockdep_init_map+0xe4/0x650 [ 25.918973] __rds_conn_create+0x112f/0x1b50 [ 25.923386] ? rds_conn_drop+0xb0/0xb0 [ 25.927260] ? __raw_spin_lock_init+0x1c/0x100 [ 25.931821] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.936828] ? __lockdep_init_map+0xe4/0x650 [ 25.941225] ? lockdep_init_map+0x9/0x10 [ 25.945264] ? __init_waitqueue_head+0x97/0x140 [ 25.949913] ? init_wait_entry+0x1b0/0x1b0 [ 25.954125] ? lockdep_init_map+0x9/0x10 [ 25.958162] ? rds_message_alloc+0x28c/0x330 [ 25.962548] ? rds_message_next_extension+0x210/0x210 [ 25.967708] ? trace_hardirqs_on+0xd/0x10 [ 25.971837] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.976222] ? __release_sock+0x360/0x360 [ 25.980339] ? lock_sock_nested+0x91/0x110 [ 25.984552] rds_conn_create_outgoing+0x3f/0x50 [ 25.989197] rds_sendmsg+0xda3/0x2390 [ 25.992974] ? avc_has_perm+0x43e/0x680 [ 25.996933] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.001401] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.005869] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.010859] ? find_held_lock+0x35/0x1d0 [ 26.014901] ? sock_has_perm+0x2a4/0x420 [ 26.018935] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.024281] ? lock_release+0xa02/0xa40 [ 26.028243] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.034104] ? __check_object_size+0x8b/0x530 [ 26.038569] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.043040] ? __might_sleep+0x95/0x190 [ 26.046993] ? selinux_socket_sendmsg+0x36/0x40 [ 26.051634] ? security_socket_sendmsg+0x89/0xb0 [ 26.056365] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.060837] sock_sendmsg+0xca/0x110 [ 26.064525] SYSC_sendto+0x361/0x5c0 [ 26.068215] ? SYSC_connect+0x4a0/0x4a0 [ 26.072170] ? __do_page_fault+0x5f7/0xc90 [ 26.076376] ? lock_downgrade+0x980/0x980 [ 26.080503] ? handle_mm_fault+0x43b/0x970 [ 26.084726] ? up_read+0x1a/0x40 [ 26.088067] ? __do_page_fault+0x3d6/0xc90 [ 26.092286] ? mm_fault_error+0x2c0/0x2c0 [ 26.096425] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.101953] SyS_sendto+0x40/0x50 [ 26.105383] ? SyS_getpeername+0x30/0x30 [ 26.109435] do_syscall_64+0x282/0x940 [ 26.113319] ? __do_page_fault+0xc90/0xc90 [ 26.117540] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.122285] ? syscall_return_slowpath+0x550/0x550 [ 26.127192] ? syscall_return_slowpath+0x2ac/0x550 [ 26.132094] ? prepare_exit_to_usermode+0x350/0x350 [ 26.137088] ? retint_user+0x18/0x18 [ 26.140779] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.145601] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.150761] RIP: 0033:0x43fd99 [ 26.153924] RSP: 002b:00007ffe9c226358 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.161604] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.168848] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.176093] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 26.183350] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.190592] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.198038] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.205485] in_atomic(): 1, irqs_disabled(): 0, pid: 4181, name: syzkaller547749 [ 26.213045] 1 lock held by syzkaller547749/4181: [ 26.217799] #0: (rcu_read_lock){....}, at: [<000000007dfb54d7>] __rds_conn_create+0xe46/0x1b50 [ 26.226766] CPU: 0 PID: 4181 Comm: syzkaller547749 Not tainted 4.15.0+ #222 [ 26.233841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.243170] Call Trace: [ 26.245736] dump_stack+0x194/0x257 [ 26.249338] ? arch_local_irq_restore+0x53/0x53 [ 26.253987] ? print_lock+0x9f/0xa2 [ 26.257588] ? lockdep_print_held_locks+0xc4/0x130 [ 26.262497] ___might_sleep+0x2b2/0x470 [ 26.266446] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.272306] ? __debug_object_init+0x235/0x1040 [ 26.276949] ? debug_mutex_init+0x1c/0x60 [ 26.281076] __might_sleep+0x95/0x190 [ 26.284859] kmem_cache_alloc_trace+0x299/0x740 [ 26.289504] ? lock_acquire+0x1d5/0x580 [ 26.293451] ? lock_acquire+0x1d5/0x580 [ 26.297400] ? __rds_conn_create+0xe46/0x1b50 [ 26.301873] rds_loop_conn_alloc+0xc8/0x380 [ 26.306179] ? rds_loop_conn_free+0x290/0x290 [ 26.310647] ? __init_waitqueue_head+0x97/0x140 [ 26.315318] ? rcutorture_record_progress+0x10/0x10 [ 26.320311] ? __lockdep_init_map+0xe4/0x650 [ 26.324709] __rds_conn_create+0x112f/0x1b50 [ 26.329109] ? rds_conn_drop+0xb0/0xb0 [ 26.332980] ? __raw_spin_lock_init+0x1c/0x100 [ 26.337536] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.342532] ? __lockdep_init_map+0xe4/0x650 [ 26.346918] ? lockdep_init_map+0x9/0x10 [ 26.350954] ? __init_waitqueue_head+0x97/0x140 [ 26.355596] ? init_wait_entry+0x1b0/0x1b0 [ 26.359808] ? lockdep_init_map+0x9/0x10 [ 26.363845] ? rds_message_alloc+0x28c/0x330 [ 26.368225] ? rds_message_next_extension+0x210/0x210 [ 26.373384] ? trace_hardirqs_on+0xd/0x10 [ 26.377507] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.381904] ? __release_sock+0x360/0x360 [ 26.386042] ? lock_sock_nested+0x91/0x110 [ 26.390251] rds_conn_create_outgoing+0x3f/0x50 [ 26.394897] rds_sendmsg+0xda3/0x2390 [ 26.398670] ? avc_has_perm+0x43e/0x680 [ 26.402629] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.407094] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.411563] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.416556] ? find_held_lock+0x35/0x1d0 [ 26.420599] ? sock_has_perm+0x2a4/0x420 [ 26.424633] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.429967] ? lock_release+0xa02/0xa40 [ 26.433914] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.439774] ? __check_object_size+0x8b/0x530 [ 26.444241] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.448712] ? __might_sleep+0x95/0x190 [ 26.452664] ? selinux_socket_sendmsg+0x36/0x40 [ 26.457309] ? security_socket_sendmsg+0x89/0xb0 [ 26.462048] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.466519] sock_sendmsg+0xca/0x110 [ 26.470205] SYSC_sendto+0x361/0x5c0 [ 26.473893] ? SYSC_connect+0x4a0/0x4a0 [ 26.477846] ? __do_page_fault+0x5f7/0xc90 [ 26.482053] ? lock_downgrade+0x980/0x980 [ 26.486266] ? handle_mm_fault+0x43b/0x970 [ 26.490489] ? up_read+0x1a/0x40 [ 26.493837] ? __do_page_fault+0x3d6/0xc90 [ 26.498062] ? mm_fault_error+0x2c0/0x2c0 [ 26.502183] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.507716] SyS_sendto+0x40/0x50 [ 26.511144] ? SyS_getpeername+0x30/0x30 [ 26.515180] do_syscall_64+0x282/0x940 [ 26.519037] ? __do_page_fault+0xc90/0xc90 [ 26.523244] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.527976] ? syscall_return_slowpath+0x550/0x550 [ 26.532888] ? syscall_return_slowpath+0x2ac/0x550 [ 26.537789] ? prepare_exit_to_usermode+0x350/0x350 [ 26.542778] ? retint_user+0x18/0x18 [ 26.546468] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.551292] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.556455] RIP: 0033:0x43fd99 [ 26.559617] RSP: 002b:00007ffe9c226358 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.567295] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.574546] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.581787] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 26.589030] R10: 0000