[....] Starting enhanced syslogd: rsyslogd[ 14.593053] audit: type=1400 audit(1518332038.806:5): avc: denied { syslog } for pid=3947 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: [ 18.778250] audit: type=1400 audit(1518332042.992:6): avc: denied { map } for pid=4086 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 '10.128.0.51' (ECDSA) to the list of known hosts. executing program [ 30.650028] audit: type=1400 audit(1518332054.863:7): avc: denied { map } for pid=4102 comm="syzkaller306361" path="/root/syzkaller306361022" 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 [ 30.677133] [ 30.678813] ============================= [ 30.682967] WARNING: suspicious RCU usage [ 30.687113] 4.15.0+ #222 Not tainted [ 30.690827] ----------------------------- [ 30.694977] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 30.704266] [ 30.704266] other info that might help us debug this: [ 30.704266] [ 30.712418] [ 30.712418] rcu_scheduler_active = 2, debug_locks = 1 [ 30.719115] 1 lock held by syzkaller306361/4102: [ 30.723873] #0: (rcu_read_lock){....}, at: [<000000007a497384>] __rds_conn_create+0xe46/0x1b50 [ 30.732832] [ 30.732832] stack backtrace: [ 30.737333] CPU: 0 PID: 4102 Comm: syzkaller306361 Not tainted 4.15.0+ #222 [ 30.744405] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.753734] Call Trace: [ 30.756298] dump_stack+0x194/0x257 [ 30.759904] ? arch_local_irq_restore+0x53/0x53 [ 30.764556] lockdep_rcu_suspicious+0x123/0x170 [ 30.769206] ___might_sleep+0x385/0x470 [ 30.773155] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 30.779018] ? __debug_object_init+0x235/0x1040 [ 30.783665] ? debug_mutex_init+0x1c/0x60 [ 30.787792] __might_sleep+0x95/0x190 [ 30.791578] kmem_cache_alloc_trace+0x299/0x740 [ 30.796223] ? lock_acquire+0x1d5/0x580 [ 30.800168] ? lock_acquire+0x1d5/0x580 [ 30.804114] ? __rds_conn_create+0xe46/0x1b50 [ 30.808588] rds_loop_conn_alloc+0xc8/0x380 [ 30.812884] ? rds_loop_conn_free+0x290/0x290 [ 30.817355] ? __init_waitqueue_head+0x97/0x140 [ 30.822001] ? rcutorture_record_progress+0x10/0x10 [ 30.826991] ? __lockdep_init_map+0xe4/0x650 [ 30.831379] __rds_conn_create+0x112f/0x1b50 [ 30.835786] ? rds_conn_drop+0xb0/0xb0 [ 30.839661] ? __raw_spin_lock_init+0x1c/0x100 [ 30.844219] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.849211] ? __lockdep_init_map+0xe4/0x650 [ 30.853594] ? lockdep_init_map+0x9/0x10 [ 30.857629] ? __init_waitqueue_head+0x97/0x140 [ 30.862273] ? init_wait_entry+0x1b0/0x1b0 [ 30.866490] ? lockdep_init_map+0x9/0x10 [ 30.870530] ? rds_message_alloc+0x28c/0x330 [ 30.874913] ? rds_message_next_extension+0x210/0x210 [ 30.880082] ? trace_hardirqs_on+0xd/0x10 [ 30.884211] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.888599] ? __release_sock+0x360/0x360 [ 30.892723] ? lock_sock_nested+0x91/0x110 [ 30.896941] rds_conn_create_outgoing+0x3f/0x50 [ 30.901591] rds_sendmsg+0xda3/0x2390 [ 30.905366] ? avc_has_perm+0x43e/0x680 [ 30.909327] ? rds_send_drop_to+0x19d0/0x19d0 [ 30.913810] ? find_held_lock+0x35/0x1d0 [ 30.917857] ? sock_has_perm+0x2a4/0x420 [ 30.921894] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 30.927232] ? lock_release+0xa02/0xa40 [ 30.931177] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 30.937062] ? __check_object_size+0x8b/0x530 [ 30.941532] ? __handle_mm_fault+0x80e/0x3ce0 [ 30.946011] ? __might_sleep+0x95/0x190 [ 30.949964] ? selinux_socket_sendmsg+0x36/0x40 [ 30.954611] ? security_socket_sendmsg+0x89/0xb0 [ 30.959344] ? rds_send_drop_to+0x19d0/0x19d0 [ 30.963815] sock_sendmsg+0xca/0x110 [ 30.967508] SYSC_sendto+0x361/0x5c0 [ 30.971202] ? SYSC_connect+0x4a0/0x4a0 [ 30.975156] ? __do_page_fault+0x5f7/0xc90 [ 30.979366] ? lock_downgrade+0x980/0x980 [ 30.983496] ? handle_mm_fault+0x43b/0x970 [ 30.987720] ? up_read+0x1a/0x40 [ 30.991064] ? __do_page_fault+0x3d6/0xc90 [ 30.995283] ? mm_fault_error+0x2c0/0x2c0 [ 30.999416] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 31.004937] SyS_sendto+0x40/0x50 [ 31.008368] ? SyS_getpeername+0x30/0x30 [ 31.012412] do_syscall_64+0x282/0x940 [ 31.016274] ? __do_page_fault+0xc90/0xc90 [ 31.020485] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.025220] ? syscall_return_slowpath+0x550/0x550 [ 31.030128] ? syscall_return_slowpath+0x2ac/0x550 [ 31.035046] ? prepare_exit_to_usermode+0x350/0x350 [ 31.040041] ? retint_user+0x18/0x18 [ 31.043736] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.048560] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 31.053725] RIP: 0033:0x43fd99 [ 31.056891] RSP: 002b:00007ffd83a591c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 31.064578] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 31.071843] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000003 [ 31.079093] RBP: 00000000006ca018 R08: 000000002069affb R09: 0000000000000010 [ 31.086349] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 31.093595] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 31.100942] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 31.108411] in_atomic(): 1, irqs_disabled(): 0, pid: 4102, name: syzkaller306361 [ 31.115967] 1 lock held by syzkaller306361/4102: [ 31.120726] #0: (rcu_read_lock){....}, at: [<000000007a497384>] __rds_conn_create+0xe46/0x1b50 [ 31.129703] CPU: 0 PID: 4102 Comm: syzkaller306361 Not tainted 4.15.0+ #222 [ 31.136899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.146230] Call Trace: [ 31.148799] dump_stack+0x194/0x257 [ 31.152401] ? arch_local_irq_restore+0x53/0x53 [ 31.157045] ? print_lock+0x9f/0xa2 [ 31.160643] ? lockdep_print_held_locks+0xc4/0x130 [ 31.165548] ___might_sleep+0x2b2/0x470 [ 31.169492] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 31.175351] ? __debug_object_init+0x235/0x1040 [ 31.179991] ? debug_mutex_init+0x1c/0x60 [ 31.184114] __might_sleep+0x95/0x190 [ 31.187891] kmem_cache_alloc_trace+0x299/0x740 [ 31.192535] ? lock_acquire+0x1d5/0x580 [ 31.196480] ? lock_acquire+0x1d5/0x580 [ 31.200428] ? __rds_conn_create+0xe46/0x1b50 [ 31.204899] rds_loop_conn_alloc+0xc8/0x380 [ 31.209194] ? rds_loop_conn_free+0x290/0x290 [ 31.213660] ? __init_waitqueue_head+0x97/0x140 [ 31.218303] ? rcutorture_record_progress+0x10/0x10 [ 31.223292] ? __lockdep_init_map+0xe4/0x650 [ 31.227676] __rds_conn_create+0x112f/0x1b50 [ 31.232073] ? rds_conn_drop+0xb0/0xb0 [ 31.235940] ? __raw_spin_lock_init+0x1c/0x100 [ 31.240492] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.245485] ? __lockdep_init_map+0xe4/0x650 [ 31.249901] ? lockdep_init_map+0x9/0x10 [ 31.253932] ? __init_waitqueue_head+0x97/0x140 [ 31.258575] ? init_wait_entry+0x1b0/0x1b0 [ 31.262786] ? lockdep_init_map+0x9/0x10 [ 31.266832] ? rds_message_alloc+0x28c/0x330 [ 31.271213] ? rds_message_next_extension+0x210/0x210 [ 31.276372] ? trace_hardirqs_on+0xd/0x10 [ 31.280496] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.284879] ? __release_sock+0x360/0x360 [ 31.288994] ? lock_sock_nested+0x91/0x110 [ 31.293203] rds_conn_create_outgoing+0x3f/0x50 [ 31.297849] rds_sendmsg+0xda3/0x2390 [ 31.301622] ? avc_has_perm+0x43e/0x680 [ 31.305582] ? rds_send_drop_to+0x19d0/0x19d0 [ 31.310059] ? find_held_lock+0x35/0x1d0 [ 31.314097] ? sock_has_perm+0x2a4/0x420 [ 31.318132] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 31.323463] ? lock_release+0xa02/0xa40 [ 31.327412] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 31.333270] ? __check_object_size+0x8b/0x530 [ 31.337738] ? __handle_mm_fault+0x80e/0x3ce0 [ 31.342223] ? __might_sleep+0x95/0x190 [ 31.346171] ? selinux_socket_sendmsg+0x36/0x40 [ 31.350812] ? security_socket_sendmsg+0x89/0xb0 [ 31.355539] ? rds_send_drop_to+0x19d0/0x19d0 [ 31.360007] sock_sendmsg+0xca/0x110 [ 31.363694] SYSC_sendto+0x361/0x5c0 [ 31.367382] ? SYSC_connect+0x4a0/0x4a0 [ 31.371334] ? __do_page_fault+0x5f7/0xc90 [ 31.375538] ? lock_downgrade+0x980/0x980 [ 31.379662] ? handle_mm_fault+0x43b/0x970 [ 31.383879] ? up_read+0x1a/0x40 [ 31.387219] ? __do_page_fault+0x3d6/0xc90 [ 31.391431] ? mm_fault_error+0x2c0/0x2c0 [ 31.395554] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 31.401065] SyS_sendto+0x40/0x50 [ 31.404492] ? SyS_getpeername+0x30/0x30 [ 31.408533] do_syscall_64+0x282/0x940 [ 31.412390] ? __do_page_fault+0xc90/0xc90 [ 31.416595] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.421340] ? syscall_return_slowpath+0x550/0x550 [ 31.426240] ? syscall_return_slowpath+0x2ac/0x550 [ 31.431140] ? prepare_exit_to_usermode+0x350/0x350 [ 31.436128] ? retint_user+0x18/0x18 [ 31.439818] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.444637] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 31.449829] RIP: 0033:0x43fd99 [ 31.45