[....] Starting enhanced syslogd: rsyslogd[ 16.017499] audit: type=1400 audit(1518430268.900:5): avc: denied { syslog } for pid=4019 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: [ 19.354891] audit: type=1400 audit(1518430272.237:6): avc: denied { map } for pid=4159 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 '10.128.0.8' (ECDSA) to the list of known hosts. executing program [ 25.674912] audit: type=1400 audit(1518430278.557:7): avc: denied { map } for pid=4173 comm="syzkaller963994" path="/root/syzkaller963994599" 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 [ 25.701273] [ 25.702979] ============================= [ 25.707138] WARNING: suspicious RCU usage [ 25.711292] 4.15.0+ #222 Not tainted [ 25.715025] ----------------------------- [ 25.719181] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.728459] [ 25.728459] other info that might help us debug this: [ 25.728459] [ 25.736610] [ 25.736610] rcu_scheduler_active = 2, debug_locks = 1 [ 25.743282] 1 lock held by syzkaller963994/4173: [ 25.748037] #0: (rcu_read_lock){....}, at: [<0000000008136a54>] __rds_conn_create+0xe46/0x1b50 [ 25.756983] [ 25.756983] stack backtrace: [ 25.761507] CPU: 0 PID: 4173 Comm: syzkaller963994 Not tainted 4.15.0+ #222 [ 25.768577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.777899] Call Trace: [ 25.780459] dump_stack+0x194/0x257 [ 25.784060] ? arch_local_irq_restore+0x53/0x53 [ 25.788712] lockdep_rcu_suspicious+0x123/0x170 [ 25.793353] ___might_sleep+0x385/0x470 [ 25.797301] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.803158] ? __debug_object_init+0x235/0x1040 [ 25.807795] ? lock_acquire+0x1d5/0x580 [ 25.811740] ? debug_mutex_init+0x1c/0x60 [ 25.815863] __might_sleep+0x95/0x190 [ 25.819642] kmem_cache_alloc_trace+0x299/0x740 [ 25.824284] ? lock_acquire+0x1d5/0x580 [ 25.828231] ? lock_acquire+0x1d5/0x580 [ 25.832180] ? __rds_conn_create+0xe46/0x1b50 [ 25.836651] rds_loop_conn_alloc+0xc8/0x380 [ 25.840945] ? rds_loop_conn_free+0x290/0x290 [ 25.845413] ? __init_waitqueue_head+0x97/0x140 [ 25.850055] ? rcutorture_record_progress+0x10/0x10 [ 25.855054] ? __lockdep_init_map+0xe4/0x650 [ 25.859446] __rds_conn_create+0x112f/0x1b50 [ 25.863845] ? rds_conn_drop+0xb0/0xb0 [ 25.867714] ? __raw_spin_lock_init+0x1c/0x100 [ 25.872270] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.877266] ? __lockdep_init_map+0xe4/0x650 [ 25.881649] ? lockdep_init_map+0x9/0x10 [ 25.885690] ? __init_waitqueue_head+0x97/0x140 [ 25.890335] ? init_wait_entry+0x1b0/0x1b0 [ 25.894545] ? lockdep_init_map+0x9/0x10 [ 25.898584] ? rds_message_alloc+0x28c/0x330 [ 25.902962] ? rds_message_next_extension+0x210/0x210 [ 25.908123] ? trace_hardirqs_on+0xd/0x10 [ 25.912247] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.916631] ? __release_sock+0x360/0x360 [ 25.920755] ? lock_sock_nested+0x91/0x110 [ 25.924973] rds_conn_create_outgoing+0x3f/0x50 [ 25.929618] rds_sendmsg+0xda3/0x2390 [ 25.933404] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.937875] ? lock_downgrade+0x980/0x980 [ 25.942001] ? find_held_lock+0x35/0x1d0 [ 25.946037] ? sock_has_perm+0x2a4/0x420 [ 25.950081] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.955417] ? lock_downgrade+0x980/0x980 [ 25.959537] ? dup_iter+0x1a2/0x260 [ 25.963137] ? lock_release+0xa40/0xa40 [ 25.967100] ? selinux_socket_sendmsg+0x36/0x40 [ 25.971743] ? security_socket_sendmsg+0x89/0xb0 [ 25.976472] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.980943] sock_sendmsg+0xca/0x110 [ 25.984629] ___sys_sendmsg+0x767/0x8b0 [ 25.988581] ? copy_msghdr_from_user+0x590/0x590 [ 25.993317] ? __pmd_alloc+0x4e0/0x4e0 [ 25.997173] ? check_noncircular+0x20/0x20 [ 26.001379] ? lock_acquire+0x1d5/0x580 [ 26.005324] ? check_noncircular+0x20/0x20 [ 26.009531] ? find_held_lock+0x35/0x1d0 [ 26.013565] ? __fget_light+0x2b2/0x3c0 [ 26.017511] ? fget_raw+0x20/0x20 [ 26.020936] ? handle_mm_fault+0x270/0x970 [ 26.025144] ? find_held_lock+0x35/0x1d0 [ 26.029185] ? __do_page_fault+0x5f7/0xc90 [ 26.033394] ? lock_downgrade+0x980/0x980 [ 26.037523] __sys_sendmsg+0xe5/0x210 [ 26.041295] ? __sys_sendmsg+0xe5/0x210 [ 26.045243] ? SyS_shutdown+0x290/0x290 [ 26.049197] ? __do_page_fault+0x3d6/0xc90 [ 26.053417] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.058930] SyS_sendmsg+0x2d/0x50 [ 26.062440] ? __sys_sendmsg+0x210/0x210 [ 26.066472] do_syscall_64+0x282/0x940 [ 26.070329] ? __do_page_fault+0xc90/0xc90 [ 26.074536] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.079263] ? syscall_return_slowpath+0x550/0x550 [ 26.084163] ? syscall_return_slowpath+0x2ac/0x550 [ 26.089067] ? prepare_exit_to_usermode+0x350/0x350 [ 26.094056] ? retint_user+0x18/0x18 [ 26.097744] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.102565] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.107725] RIP: 0033:0x43fe29 [ 26.110884] RSP: 002b:00007fff343372c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.118564] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fe29 [ 26.125805] RDX: 0000000000000000 RSI: 0000000020fc5fc8 RDI: 0000000000000003 [ 26.133045] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 26.140286] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 26.147525] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 26.154850] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.162317] in_atomic(): 1, irqs_disabled(): 0, pid: 4173, name: syzkaller963994 [ 26.169862] 1 lock held by syzkaller963994/4173: [ 26.174621] #0: (rcu_read_lock){....}, at: [<0000000008136a54>] __rds_conn_create+0xe46/0x1b50 [ 26.183576] CPU: 0 PID: 4173 Comm: syzkaller963994 Not tainted 4.15.0+ #222 [ 26.190654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.199977] Call Trace: [ 26.202538] dump_stack+0x194/0x257 [ 26.206138] ? arch_local_irq_restore+0x53/0x53 [ 26.210778] ? print_lock+0x9f/0xa2 [ 26.214379] ? lockdep_print_held_locks+0xc4/0x130 [ 26.219287] ___might_sleep+0x2b2/0x470 [ 26.223231] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.229084] ? __debug_object_init+0x235/0x1040 [ 26.233722] ? lock_acquire+0x1d5/0x580 [ 26.237669] ? debug_mutex_init+0x1c/0x60 [ 26.241794] __might_sleep+0x95/0x190 [ 26.245569] kmem_cache_alloc_trace+0x299/0x740 [ 26.250217] ? lock_acquire+0x1d5/0x580 [ 26.254160] ? lock_acquire+0x1d5/0x580 [ 26.258110] ? __rds_conn_create+0xe46/0x1b50 [ 26.262579] rds_loop_conn_alloc+0xc8/0x380 [ 26.266871] ? rds_loop_conn_free+0x290/0x290 [ 26.271336] ? __init_waitqueue_head+0x97/0x140 [ 26.275982] ? rcutorture_record_progress+0x10/0x10 [ 26.280970] ? __lockdep_init_map+0xe4/0x650 [ 26.285352] __rds_conn_create+0x112f/0x1b50 [ 26.289748] ? rds_conn_drop+0xb0/0xb0 [ 26.293618] ? __raw_spin_lock_init+0x1c/0x100 [ 26.298172] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.303166] ? __lockdep_init_map+0xe4/0x650 [ 26.307548] ? lockdep_init_map+0x9/0x10 [ 26.311578] ? __init_waitqueue_head+0x97/0x140 [ 26.316219] ? init_wait_entry+0x1b0/0x1b0 [ 26.320429] ? lockdep_init_map+0x9/0x10 [ 26.324464] ? rds_message_alloc+0x28c/0x330 [ 26.328844] ? rds_message_next_extension+0x210/0x210 [ 26.334001] ? trace_hardirqs_on+0xd/0x10 [ 26.338130] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.342513] ? __release_sock+0x360/0x360 [ 26.346629] ? lock_sock_nested+0x91/0x110 [ 26.350838] rds_conn_create_outgoing+0x3f/0x50 [ 26.355482] rds_sendmsg+0xda3/0x2390 [ 26.359268] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.363740] ? lock_downgrade+0x980/0x980 [ 26.367865] ? find_held_lock+0x35/0x1d0 [ 26.371903] ? sock_has_perm+0x2a4/0x420 [ 26.375935] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.381266] ? lock_downgrade+0x980/0x980 [ 26.385385] ? dup_iter+0x1a2/0x260 [ 26.388992] ? lock_release+0xa40/0xa40 [ 26.392957] ? selinux_socket_sendmsg+0x36/0x40 [ 26.397599] ? security_socket_sendmsg+0x89/0xb0 [ 26.402329] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.406800] sock_sendmsg+0xca/0x110 [ 26.410488] ___sys_sendmsg+0x767/0x8b0 [ 26.414438] ? copy_msghdr_from_user+0x590/0x590 [ 26.419172] ? __pmd_alloc+0x4e0/0x4e0 [ 26.423036] ? check_noncircular+0x20/0x20 [ 26.427241] ? lock_acquire+0x1d5/0x580 [ 26.431192] ? check_noncircular+0x20/0x20 [ 26.435396] ? find_held_lock+0x35/0x1d0 [ 26.439431] ? __fget_light+0x2b2/0x3c0 [ 26.443379] ? fget_raw+0x20/0x20 [ 26.446801] ? handle_mm_fault+0x270/0x970 [ 26.451015] ? find_held_lock+0x35/0x1d0 [ 26.455063] ? __do_page_fault+0x5f7/0xc90 [ 26.459270] ? lock_downgrade+0x980/0x980 [ 26.463398] __sys_sendmsg+0xe5/0x210 [ 26.467171] ? __sys_sendmsg+0xe5/0x210 [ 26.471120] ? SyS_shutdown+0x290/0x290 [ 26.475076] ? __do_page_fault+0x3d6/0xc90 [ 26.479295] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.484809] SyS_sendmsg+0x2d/0x50 [ 26.488322] ? __sys_sendmsg+0x210/0x210 [ 26.492354] do_syscall_64+0x282/0x940 [ 26.496213] ? __do_page_fault+0xc90/0xc90 [ 26.500421] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.505148] ? syscall_return_slowpath+0x550/0x550 [ 26.510049] ? syscall_return_slowpath+0x2ac/0x550 [ 26.514950] ? prepare_exit_to_usermode+0x350/0x350 [ 26.519937] ? retint_user+0x18/0x18 [ 26.523627] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.528447] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.533606] RIP: 0033:0x43fe29 [ 26.536767] RSP: 002b:00007fff343372c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.544445] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fe29 [ 26.551684] RDX: 0000000000000000 RSI: 0000000020fc5fc8 RDI: 0000000000000003 [ 26.559513] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 26.566755] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 26.573997] R13: 00000000004017e0 R14: 0000000000000000 R