[....] Starting enhanced syslogd: rsyslogd[ 15.439598] audit: type=1400 audit(1518396231.038:5): avc: denied { syslog } for pid=4005 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: [ 19.093488] audit: type=1400 audit(1518396234.692:6): 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program [ 25.312047] audit: type=1400 audit(1518396240.910:7): avc: denied { map } for pid=4159 comm="syzkaller561249" path="/root/syzkaller561249990" 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 [ 25.338554] [ 25.340351] ============================= [ 25.344515] WARNING: suspicious RCU usage [ 25.348681] 4.15.0+ #222 Not tainted [ 25.352433] ----------------------------- [ 25.356595] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.365882] [ 25.365882] other info that might help us debug this: [ 25.365882] [ 25.374052] [ 25.374052] rcu_scheduler_active = 2, debug_locks = 1 [ 25.380752] 1 lock held by syzkaller561249/4159: [ 25.385522] #0: (rcu_read_lock){....}, at: [<000000000e1e8428>] __rds_conn_create+0xe46/0x1b50 [ 25.394482] [ 25.394482] stack backtrace: [ 25.398989] CPU: 1 PID: 4159 Comm: syzkaller561249 Not tainted 4.15.0+ #222 [ 25.406078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.415415] Call Trace: [ 25.417987] dump_stack+0x194/0x257 [ 25.421594] ? arch_local_irq_restore+0x53/0x53 [ 25.426251] lockdep_rcu_suspicious+0x123/0x170 [ 25.430896] ___might_sleep+0x385/0x470 [ 25.434846] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.440709] ? __debug_object_init+0x235/0x1040 [ 25.445354] ? debug_mutex_init+0x1c/0x60 [ 25.449481] __might_sleep+0x95/0x190 [ 25.453262] kmem_cache_alloc_trace+0x299/0x740 [ 25.457908] ? lock_acquire+0x1d5/0x580 [ 25.461863] ? lock_acquire+0x1d5/0x580 [ 25.465813] ? __rds_conn_create+0xe46/0x1b50 [ 25.470288] rds_loop_conn_alloc+0xc8/0x380 [ 25.474584] ? rds_loop_conn_free+0x290/0x290 [ 25.479066] ? __init_waitqueue_head+0x97/0x140 [ 25.483713] ? rcutorture_record_progress+0x10/0x10 [ 25.488716] ? __lockdep_init_map+0xe4/0x650 [ 25.493106] __rds_conn_create+0x112f/0x1b50 [ 25.497507] ? rds_conn_drop+0xb0/0xb0 [ 25.501393] ? __raw_spin_lock_init+0x1c/0x100 [ 25.505966] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.510969] ? __lockdep_init_map+0xe4/0x650 [ 25.515359] ? lockdep_init_map+0x9/0x10 [ 25.519407] ? __init_waitqueue_head+0x97/0x140 [ 25.524070] ? init_wait_entry+0x1b0/0x1b0 [ 25.528302] ? lockdep_init_map+0x9/0x10 [ 25.532346] ? rds_message_alloc+0x28c/0x330 [ 25.536731] ? rds_message_next_extension+0x210/0x210 [ 25.541893] ? trace_hardirqs_on+0xd/0x10 [ 25.546028] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.550419] ? __release_sock+0x360/0x360 [ 25.554537] ? lock_sock_nested+0x91/0x110 [ 25.558752] rds_conn_create_outgoing+0x3f/0x50 [ 25.563399] rds_sendmsg+0xda3/0x2390 [ 25.567173] ? avc_has_perm+0x43e/0x680 [ 25.571135] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.575606] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.580078] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.585073] ? find_held_lock+0x35/0x1d0 [ 25.589120] ? sock_has_perm+0x2a4/0x420 [ 25.593158] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.598497] ? lock_release+0xa02/0xa40 [ 25.602447] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.608306] ? __check_object_size+0x8b/0x530 [ 25.612784] ? __might_sleep+0x95/0x190 [ 25.616737] ? selinux_socket_sendmsg+0x36/0x40 [ 25.621383] ? security_socket_sendmsg+0x89/0xb0 [ 25.626124] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.630626] sock_sendmsg+0xca/0x110 [ 25.634317] SYSC_sendto+0x361/0x5c0 [ 25.638008] ? SYSC_connect+0x4a0/0x4a0 [ 25.641975] ? schedule+0xf5/0x430 [ 25.645486] ? SYSC_bind+0x290/0x410 [ 25.649189] ? exit_to_usermode_loop+0x8c/0x2f0 [ 25.653837] ? trace_hardirqs_off+0xd/0x10 [ 25.658043] ? exit_to_usermode_loop+0x198/0x2f0 [ 25.662773] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.668287] SyS_sendto+0x40/0x50 [ 25.671715] ? SyS_getpeername+0x30/0x30 [ 25.675759] do_syscall_64+0x282/0x940 [ 25.679620] ? __do_page_fault+0xc90/0xc90 [ 25.683831] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.688562] ? syscall_return_slowpath+0x550/0x550 [ 25.693467] ? syscall_return_slowpath+0x2ac/0x550 [ 25.698372] ? prepare_exit_to_usermode+0x350/0x350 [ 25.703363] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 25.708703] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.713523] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.718686] RIP: 0033:0x43fd99 [ 25.721850] RSP: 002b:00007ffdb2e07398 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.729532] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.736780] RDX: 0000000000000000 RSI: 0000000020007000 RDI: 0000000000000003 [ 25.744028] RBP: 00000000006ca018 R08: 0000000020000000 R09: 0000000000000010 [ 25.751272] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.758513] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.765826] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.773288] in_atomic(): 1, irqs_disabled(): 0, pid: 4159, name: syzkaller561249 [ 25.780833] 1 lock held by syzkaller561249/4159: [ 25.785587] #0: (rcu_read_lock){....}, at: [<000000000e1e8428>] __rds_conn_create+0xe46/0x1b50 [ 25.794542] CPU: 1 PID: 4159 Comm: syzkaller561249 Not tainted 4.15.0+ #222 [ 25.801620] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.810946] Call Trace: [ 25.813506] dump_stack+0x194/0x257 [ 25.817110] ? arch_local_irq_restore+0x53/0x53 [ 25.821753] ? print_lock+0x9f/0xa2 [ 25.825352] ? lockdep_print_held_locks+0xc4/0x130 [ 25.830272] ___might_sleep+0x2b2/0x470 [ 25.834224] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.840081] ? __debug_object_init+0x235/0x1040 [ 25.844725] ? debug_mutex_init+0x1c/0x60 [ 25.848859] __might_sleep+0x95/0x190 [ 25.852639] kmem_cache_alloc_trace+0x299/0x740 [ 25.857283] ? lock_acquire+0x1d5/0x580 [ 25.861231] ? lock_acquire+0x1d5/0x580 [ 25.865178] ? __rds_conn_create+0xe46/0x1b50 [ 25.869661] rds_loop_conn_alloc+0xc8/0x380 [ 25.873958] ? rds_loop_conn_free+0x290/0x290 [ 25.878431] ? __init_waitqueue_head+0x97/0x140 [ 25.883074] ? rcutorture_record_progress+0x10/0x10 [ 25.888077] ? __lockdep_init_map+0xe4/0x650 [ 25.892464] __rds_conn_create+0x112f/0x1b50 [ 25.896864] ? rds_conn_drop+0xb0/0xb0 [ 25.900738] ? __raw_spin_lock_init+0x1c/0x100 [ 25.905295] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.910291] ? __lockdep_init_map+0xe4/0x650 [ 25.914675] ? lockdep_init_map+0x9/0x10 [ 25.918710] ? __init_waitqueue_head+0x97/0x140 [ 25.923354] ? init_wait_entry+0x1b0/0x1b0 [ 25.927566] ? lockdep_init_map+0x9/0x10 [ 25.931604] ? rds_message_alloc+0x28c/0x330 [ 25.935988] ? rds_message_next_extension+0x210/0x210 [ 25.941150] ? trace_hardirqs_on+0xd/0x10 [ 25.945276] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.949664] ? __release_sock+0x360/0x360 [ 25.953784] ? lock_sock_nested+0x91/0x110 [ 25.957998] rds_conn_create_outgoing+0x3f/0x50 [ 25.962663] rds_sendmsg+0xda3/0x2390 [ 25.966438] ? avc_has_perm+0x43e/0x680 [ 25.970398] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.974870] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.979342] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.984334] ? find_held_lock+0x35/0x1d0 [ 25.988377] ? sock_has_perm+0x2a4/0x420 [ 25.992414] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.997751] ? lock_release+0xa02/0xa40 [ 26.001701] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.007562] ? __check_object_size+0x8b/0x530 [ 26.012038] ? __might_sleep+0x95/0x190 [ 26.015992] ? selinux_socket_sendmsg+0x36/0x40 [ 26.020635] ? security_socket_sendmsg+0x89/0xb0 [ 26.025364] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.029836] sock_sendmsg+0xca/0x110 [ 26.033535] SYSC_sendto+0x361/0x5c0 [ 26.037231] ? SYSC_connect+0x4a0/0x4a0 [ 26.041192] ? schedule+0xf5/0x430 [ 26.044706] ? SYSC_bind+0x290/0x410 [ 26.048411] ? exit_to_usermode_loop+0x8c/0x2f0 [ 26.053057] ? trace_hardirqs_off+0xd/0x10 [ 26.057265] ? exit_to_usermode_loop+0x198/0x2f0 [ 26.061997] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.067515] SyS_sendto+0x40/0x50 [ 26.070943] ? SyS_getpeername+0x30/0x30 [ 26.074977] do_syscall_64+0x282/0x940 [ 26.078835] ? __do_page_fault+0xc90/0xc90 [ 26.083045] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.087776] ? syscall_return_slowpath+0x550/0x550 [ 26.092679] ? syscall_return_slowpath+0x2ac/0x550 [ 26.097583] ? prepare_exit_to_usermode+0x350/0x350 [ 26.102575] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.107916] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.112736] entry_SYSCALL_64_a