[....] Starting enhanced syslogd: rsyslogd[ 15.212911] audit: type=1400 audit(1518425755.668:5): 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 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: [ 18.796568] audit: type=1400 audit(1518425759.252:6): 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 '10.128.0.27' (ECDSA) to the list of known hosts. executing program [ 25.082360] audit: type=1400 audit(1518425765.538:7): avc: denied { map } for pid=4160 comm="syzkaller427240" path="/root/syzkaller427240766" 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 [ 25.109157] [ 25.110873] ============================= [ 25.115039] WARNING: suspicious RCU usage [ 25.119185] 4.15.0+ #222 Not tainted [ 25.122897] ----------------------------- [ 25.127051] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.136319] [ 25.136319] other info that might help us debug this: [ 25.136319] [ 25.144463] [ 25.144463] rcu_scheduler_active = 2, debug_locks = 1 [ 25.151131] 1 lock held by syzkaller427240/4160: [ 25.155883] #0: (rcu_read_lock){....}, at: [<000000007837d177>] __rds_conn_create+0xe46/0x1b50 [ 25.164826] [ 25.164826] stack backtrace: [ 25.169324] CPU: 1 PID: 4160 Comm: syzkaller427240 Not tainted 4.15.0+ #222 [ 25.176392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.185714] Call Trace: [ 25.188275] dump_stack+0x194/0x257 [ 25.191875] ? arch_local_irq_restore+0x53/0x53 [ 25.196526] lockdep_rcu_suspicious+0x123/0x170 [ 25.201168] ___might_sleep+0x385/0x470 [ 25.205114] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.210967] ? __debug_object_init+0x235/0x1040 [ 25.215610] ? debug_mutex_init+0x1c/0x60 [ 25.219734] __might_sleep+0x95/0x190 [ 25.223512] kmem_cache_alloc_trace+0x299/0x740 [ 25.228155] ? lock_acquire+0x1d5/0x580 [ 25.232099] ? lock_acquire+0x1d5/0x580 [ 25.236045] ? __rds_conn_create+0xe46/0x1b50 [ 25.240517] rds_loop_conn_alloc+0xc8/0x380 [ 25.244812] ? rds_loop_conn_free+0x290/0x290 [ 25.249279] ? __init_waitqueue_head+0x97/0x140 [ 25.253921] ? rcutorture_record_progress+0x10/0x10 [ 25.258909] ? __lockdep_init_map+0xe4/0x650 [ 25.263292] __rds_conn_create+0x112f/0x1b50 [ 25.267699] ? rds_conn_drop+0xb0/0xb0 [ 25.271572] ? __raw_spin_lock_init+0x1c/0x100 [ 25.276127] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.281120] ? __lockdep_init_map+0xe4/0x650 [ 25.285503] ? lockdep_init_map+0x9/0x10 [ 25.289535] ? __init_waitqueue_head+0x97/0x140 [ 25.294189] ? init_wait_entry+0x1b0/0x1b0 [ 25.298401] ? lockdep_init_map+0x9/0x10 [ 25.302435] ? rds_message_alloc+0x28c/0x330 [ 25.306816] ? rds_message_next_extension+0x210/0x210 [ 25.311977] ? trace_hardirqs_on+0xd/0x10 [ 25.316099] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.320482] ? __release_sock+0x360/0x360 [ 25.324598] ? lock_sock_nested+0x91/0x110 [ 25.328808] rds_conn_create_outgoing+0x3f/0x50 [ 25.333453] rds_sendmsg+0xda3/0x2390 [ 25.337228] ? avc_has_perm+0x43e/0x680 [ 25.341188] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.345654] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.350122] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.355114] ? find_held_lock+0x35/0x1d0 [ 25.359155] ? sock_has_perm+0x2a4/0x420 [ 25.363189] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.368525] ? lock_release+0xa02/0xa40 [ 25.372471] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.378327] ? __check_object_size+0x8b/0x530 [ 25.382801] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.387275] ? __might_sleep+0x95/0x190 [ 25.391227] ? selinux_socket_sendmsg+0x36/0x40 [ 25.395870] ? security_socket_sendmsg+0x89/0xb0 [ 25.400599] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.405070] sock_sendmsg+0xca/0x110 [ 25.408760] SYSC_sendto+0x361/0x5c0 [ 25.412453] ? SYSC_connect+0x4a0/0x4a0 [ 25.416406] ? __do_page_fault+0x5f7/0xc90 [ 25.420616] ? lock_downgrade+0x980/0x980 [ 25.424743] ? handle_mm_fault+0x43b/0x970 [ 25.428962] ? up_read+0x1a/0x40 [ 25.432305] ? __do_page_fault+0x3d6/0xc90 [ 25.436516] ? mm_fault_error+0x2c0/0x2c0 [ 25.440638] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.446153] SyS_sendto+0x40/0x50 [ 25.449579] ? SyS_getpeername+0x30/0x30 [ 25.453612] do_syscall_64+0x282/0x940 [ 25.457475] ? __do_page_fault+0xc90/0xc90 [ 25.461695] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.467204] ? syscall_return_slowpath+0x550/0x550 [ 25.472107] ? syscall_return_slowpath+0x2ac/0x550 [ 25.477017] ? retint_user+0x18/0x18 [ 25.480712] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.485532] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.490693] RIP: 0033:0x43fd99 [ 25.493854] RSP: 002b:00007ffff88b9548 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.501539] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.508778] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 25.516027] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 25.523268] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.530507] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.537842] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.545302] in_atomic(): 1, irqs_disabled(): 0, pid: 4160, name: syzkaller427240 [ 25.552840] 1 lock held by syzkaller427240/4160: [ 25.557603] #0: (rcu_read_lock){....}, at: [<000000007837d177>] __rds_conn_create+0xe46/0x1b50 [ 25.566565] CPU: 1 PID: 4160 Comm: syzkaller427240 Not tainted 4.15.0+ #222 [ 25.573642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.582967] Call Trace: [ 25.585527] dump_stack+0x194/0x257 [ 25.589131] ? arch_local_irq_restore+0x53/0x53 [ 25.593772] ? print_lock+0x9f/0xa2 [ 25.597372] ? lockdep_print_held_locks+0xc4/0x130 [ 25.602280] ___might_sleep+0x2b2/0x470 [ 25.606226] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.612082] ? __debug_object_init+0x235/0x1040 [ 25.616724] ? debug_mutex_init+0x1c/0x60 [ 25.620846] __might_sleep+0x95/0x190 [ 25.624623] kmem_cache_alloc_trace+0x299/0x740 [ 25.629264] ? lock_acquire+0x1d5/0x580 [ 25.633208] ? lock_acquire+0x1d5/0x580 [ 25.637155] ? __rds_conn_create+0xe46/0x1b50 [ 25.641629] rds_loop_conn_alloc+0xc8/0x380 [ 25.645922] ? rds_loop_conn_free+0x290/0x290 [ 25.650387] ? __init_waitqueue_head+0x97/0x140 [ 25.655035] ? rcutorture_record_progress+0x10/0x10 [ 25.660033] ? __lockdep_init_map+0xe4/0x650 [ 25.664418] __rds_conn_create+0x112f/0x1b50 [ 25.668814] ? rds_conn_drop+0xb0/0xb0 [ 25.672685] ? __raw_spin_lock_init+0x1c/0x100 [ 25.677238] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.682229] ? __lockdep_init_map+0xe4/0x650 [ 25.686613] ? lockdep_init_map+0x9/0x10 [ 25.690645] ? __init_waitqueue_head+0x97/0x140 [ 25.695285] ? init_wait_entry+0x1b0/0x1b0 [ 25.699496] ? lockdep_init_map+0x9/0x10 [ 25.703531] ? rds_message_alloc+0x28c/0x330 [ 25.707911] ? rds_message_next_extension+0x210/0x210 [ 25.713074] ? trace_hardirqs_on+0xd/0x10 [ 25.717195] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.721577] ? __release_sock+0x360/0x360 [ 25.725695] ? lock_sock_nested+0x91/0x110 [ 25.729907] rds_conn_create_outgoing+0x3f/0x50 [ 25.734549] rds_sendmsg+0xda3/0x2390 [ 25.738321] ? avc_has_perm+0x43e/0x680 [ 25.742282] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.746747] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.751217] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.756209] ? find_held_lock+0x35/0x1d0 [ 25.760252] ? sock_has_perm+0x2a4/0x420 [ 25.764290] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.769637] ? lock_release+0xa02/0xa40 [ 25.773581] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.779439] ? __check_object_size+0x8b/0x530 [ 25.783904] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.788374] ? __might_sleep+0x95/0x190 [ 25.792323] ? selinux_socket_sendmsg+0x36/0x40 [ 25.796967] ? security_socket_sendmsg+0x89/0xb0 [ 25.801692] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.806163] sock_sendmsg+0xca/0x110 [ 25.809851] SYSC_sendto+0x361/0x5c0 [ 25.813539] ? SYSC_connect+0x4a0/0x4a0 [ 25.817488] ? __do_page_fault+0x5f7/0xc90 [ 25.821693] ? lock_downgrade+0x980/0x980 [ 25.825823] ? handle_mm_fault+0x43b/0x970 [ 25.830047] ? up_read+0x1a/0x40 [ 25.833385] ? __do_page_fault+0x3d6/0xc90 [ 25.837598] ? mm_fault_error+0x2c0/0x2c0 [ 25.841722] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.847235] SyS_sendto+0x40/0x50 [ 25.850669] ? SyS_getpeername+0x30/0x30 [ 25.854719] do_syscall_64+0x282/0x940 [ 25.858579] ? __do_page_fault+0xc90/0xc90 [ 25.862787] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.868298] ? syscall_return_slowpath+0x550/0x550 [ 25.873199] ? syscall_return_slowpath+0x2ac/0x550 [ 25.878104] ? retint_user+0x18/0x18 [ 25.881793] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.886622] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.891782] RIP: 0033:0x43fd99 [ 25.894943] RSP: 002b:00007ffff88b9548 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.902620] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.909860] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 25.917099] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 25.924339] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.931578] R13: 0000000000401750 R14: 00000000000