[....] Starting enhanced syslogd: rsyslogd[ 16.595985] audit: type=1400 audit(1518426555.670:5): avc: denied { syslog } for pid=4007 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: [ 22.449936] audit: type=1400 audit(1518426561.524:6): avc: denied { map } for pid=4146 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program [ 28.722950] audit: type=1400 audit(1518426567.797:7): avc: denied { map } for pid=4160 comm="syzkaller540945" path="/root/syzkaller540945014" 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 [ 28.749926] [ 28.751641] ============================= [ 28.755800] WARNING: suspicious RCU usage [ 28.759947] 4.15.0+ #222 Not tainted [ 28.763666] ----------------------------- [ 28.767861] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.777127] [ 28.777127] other info that might help us debug this: [ 28.777127] [ 28.785267] [ 28.785267] rcu_scheduler_active = 2, debug_locks = 1 [ 28.791929] 1 lock held by syzkaller540945/4160: [ 28.796680] #0: (rcu_read_lock){....}, at: [<000000008a456afd>] __rds_conn_create+0xe46/0x1b50 [ 28.805620] [ 28.805620] stack backtrace: [ 28.810115] CPU: 0 PID: 4160 Comm: syzkaller540945 Not tainted 4.15.0+ #222 [ 28.817184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.826507] Call Trace: [ 28.829077] dump_stack+0x194/0x257 [ 28.832681] ? arch_local_irq_restore+0x53/0x53 [ 28.837332] lockdep_rcu_suspicious+0x123/0x170 [ 28.841975] ___might_sleep+0x385/0x470 [ 28.845923] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.851787] ? __debug_object_init+0x235/0x1040 [ 28.856432] ? debug_mutex_init+0x1c/0x60 [ 28.860556] __might_sleep+0x95/0x190 [ 28.864336] kmem_cache_alloc_trace+0x299/0x740 [ 28.868978] ? lock_acquire+0x1d5/0x580 [ 28.872926] ? lock_acquire+0x1d5/0x580 [ 28.876872] ? __rds_conn_create+0xe46/0x1b50 [ 28.881343] rds_loop_conn_alloc+0xc8/0x380 [ 28.885639] ? rds_loop_conn_free+0x290/0x290 [ 28.890109] ? __init_waitqueue_head+0x97/0x140 [ 28.894763] ? rcutorture_record_progress+0x10/0x10 [ 28.899760] ? __lockdep_init_map+0xe4/0x650 [ 28.904148] __rds_conn_create+0x112f/0x1b50 [ 28.908548] ? rds_conn_drop+0xb0/0xb0 [ 28.912418] ? __raw_spin_lock_init+0x1c/0x100 [ 28.916974] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.921988] ? __lockdep_init_map+0xe4/0x650 [ 28.926374] ? lockdep_init_map+0x9/0x10 [ 28.930407] ? __init_waitqueue_head+0x97/0x140 [ 28.935060] ? init_wait_entry+0x1b0/0x1b0 [ 28.939272] ? lockdep_init_map+0x9/0x10 [ 28.943320] ? rds_message_alloc+0x28c/0x330 [ 28.947704] ? rds_message_next_extension+0x210/0x210 [ 28.952871] ? trace_hardirqs_on+0xd/0x10 [ 28.956997] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.961386] ? __release_sock+0x360/0x360 [ 28.965506] ? lock_sock_nested+0x91/0x110 [ 28.969717] rds_conn_create_outgoing+0x3f/0x50 [ 28.974360] rds_sendmsg+0xda3/0x2390 [ 28.978141] ? avc_has_perm+0x43e/0x680 [ 28.982102] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.986570] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.991049] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.996052] ? find_held_lock+0x35/0x1d0 [ 29.000099] ? sock_has_perm+0x2a4/0x420 [ 29.004138] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.009475] ? lock_release+0xa02/0xa40 [ 29.013422] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.019279] ? __check_object_size+0x8b/0x530 [ 29.023747] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.028221] ? __might_sleep+0x95/0x190 [ 29.032173] ? selinux_socket_sendmsg+0x36/0x40 [ 29.036815] ? security_socket_sendmsg+0x89/0xb0 [ 29.041545] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.046023] sock_sendmsg+0xca/0x110 [ 29.049732] SYSC_sendto+0x361/0x5c0 [ 29.053425] ? SYSC_connect+0x4a0/0x4a0 [ 29.057381] ? __do_page_fault+0x5f7/0xc90 [ 29.061591] ? lock_downgrade+0x980/0x980 [ 29.065722] ? handle_mm_fault+0x43b/0x970 [ 29.069947] ? up_read+0x1a/0x40 [ 29.073287] ? __do_page_fault+0x3d6/0xc90 [ 29.077503] ? mm_fault_error+0x2c0/0x2c0 [ 29.081627] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.087141] SyS_sendto+0x40/0x50 [ 29.090570] ? SyS_getpeername+0x30/0x30 [ 29.094608] do_syscall_64+0x282/0x940 [ 29.098466] ? __do_page_fault+0xc90/0xc90 [ 29.102676] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.108190] ? syscall_return_slowpath+0x550/0x550 [ 29.113104] ? syscall_return_slowpath+0x2ac/0x550 [ 29.118017] ? retint_user+0x18/0x18 [ 29.121715] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.126536] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.131695] RIP: 0033:0x43fd99 [ 29.134858] RSP: 002b:00007ffcd0a44688 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.142538] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 29.149781] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 29.157027] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 29.164280] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 29.171524] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 29.178823] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.186275] in_atomic(): 1, irqs_disabled(): 0, pid: 4160, name: syzkaller540945 [ 29.193816] 1 lock held by syzkaller540945/4160: [ 29.198566] #0: (rcu_read_lock){....}, at: [<000000008a456afd>] __rds_conn_create+0xe46/0x1b50 [ 29.207518] CPU: 0 PID: 4160 Comm: syzkaller540945 Not tainted 4.15.0+ #222 [ 29.214599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.223927] Call Trace: [ 29.226499] dump_stack+0x194/0x257 [ 29.230108] ? arch_local_irq_restore+0x53/0x53 [ 29.234755] ? print_lock+0x9f/0xa2 [ 29.238358] ? lockdep_print_held_locks+0xc4/0x130 [ 29.243269] ___might_sleep+0x2b2/0x470 [ 29.247226] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.253082] ? __debug_object_init+0x235/0x1040 [ 29.257725] ? debug_mutex_init+0x1c/0x60 [ 29.261851] __might_sleep+0x95/0x190 [ 29.265631] kmem_cache_alloc_trace+0x299/0x740 [ 29.270274] ? lock_acquire+0x1d5/0x580 [ 29.274222] ? lock_acquire+0x1d5/0x580 [ 29.278170] ? __rds_conn_create+0xe46/0x1b50 [ 29.282645] rds_loop_conn_alloc+0xc8/0x380 [ 29.286946] ? rds_loop_conn_free+0x290/0x290 [ 29.291418] ? __init_waitqueue_head+0x97/0x140 [ 29.296068] ? rcutorture_record_progress+0x10/0x10 [ 29.301058] ? __lockdep_init_map+0xe4/0x650 [ 29.305444] __rds_conn_create+0x112f/0x1b50 [ 29.309843] ? rds_conn_drop+0xb0/0xb0 [ 29.313713] ? __raw_spin_lock_init+0x1c/0x100 [ 29.318272] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.323268] ? __lockdep_init_map+0xe4/0x650 [ 29.327653] ? lockdep_init_map+0x9/0x10 [ 29.331687] ? __init_waitqueue_head+0x97/0x140 [ 29.336330] ? init_wait_entry+0x1b0/0x1b0 [ 29.340541] ? lockdep_init_map+0x9/0x10 [ 29.344579] ? rds_message_alloc+0x28c/0x330 [ 29.348962] ? rds_message_next_extension+0x210/0x210 [ 29.354123] ? trace_hardirqs_on+0xd/0x10 [ 29.358249] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.362635] ? __release_sock+0x360/0x360 [ 29.366753] ? lock_sock_nested+0x91/0x110 [ 29.370965] rds_conn_create_outgoing+0x3f/0x50 [ 29.375613] rds_sendmsg+0xda3/0x2390 [ 29.379385] ? avc_has_perm+0x43e/0x680 [ 29.383347] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.387817] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.392289] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.397282] ? find_held_lock+0x35/0x1d0 [ 29.401324] ? sock_has_perm+0x2a4/0x420 [ 29.405360] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.411241] ? lock_release+0xa02/0xa40 [ 29.415189] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.421051] ? __check_object_size+0x8b/0x530 [ 29.425521] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.429996] ? __might_sleep+0x95/0x190 [ 29.433974] ? selinux_socket_sendmsg+0x36/0x40 [ 29.438615] ? security_socket_sendmsg+0x89/0xb0 [ 29.443346] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.447816] sock_sendmsg+0xca/0x110 [ 29.451504] SYSC_sendto+0x361/0x5c0 [ 29.455195] ? SYSC_connect+0x4a0/0x4a0 [ 29.459161] ? __do_page_fault+0x5f7/0xc90 [ 29.463371] ? lock_downgrade+0x980/0x980 [ 29.467500] ? handle_mm_fault+0x43b/0x970 [ 29.471720] ? up_read+0x1a/0x40 [ 29.475069] ? __do_page_fault+0x3d6/0xc90 [ 29.479285] ? mm_fault_error+0x2c0/0x2c0 [ 29.483409] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.488926] SyS_sendto+0x40/0x50 [ 29.492359] ? SyS_getpeername+0x30/0x30 [ 29.496399] do_syscall_64+0x282/0x940 [ 29.500262] ? __do_page_fault+0xc90/0xc90 [ 29.504470] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.509980] ? syscall_return_slowpath+0x550/0x550 [ 29.514885] ? syscall_return_slowpath+0x2ac/0x550 [ 29.519793] ? retint_user+0x18/0x18 [ 29.523488] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.528308] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.533469] RIP: 0033:0x43fd99 [ 29.536631] RSP: 002b:00007ffcd0a44688 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.544312] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 29.551555] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 29.558805] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 29.566054] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 29.573296] R13: 0000000000401750 R14: