[....] Starting enhanced syslogd: rsyslogd[ 14.856187] audit: type=1400 audit(1518294787.373:5): avc: denied { syslog } for pid=3951 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: [ 19.081866] audit: type=1400 audit(1518294791.598:6): avc: denied { map } for pid=4092 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 '10.128.0.43' (ECDSA) to the list of known hosts. executing program [ 25.402941] audit: type=1400 audit(1518294797.919:7): avc: denied { map } for pid=4106 comm="syzkaller324752" path="/root/syzkaller324752639" 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 [ 25.431346] [ 25.433056] ============================= [ 25.437216] WARNING: suspicious RCU usage [ 25.441379] 4.15.0+ #222 Not tainted [ 25.445108] ----------------------------- [ 25.449277] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.458564] [ 25.458564] other info that might help us debug this: [ 25.458564] [ 25.466729] [ 25.466729] rcu_scheduler_active = 2, debug_locks = 1 [ 25.473406] 1 lock held by syzkaller324752/4106: [ 25.478175] #0: (rcu_read_lock){....}, at: [<000000001cb10fdf>] __rds_conn_create+0xe46/0x1b50 [ 25.487139] [ 25.487139] stack backtrace: [ 25.491658] CPU: 0 PID: 4106 Comm: syzkaller324752 Not tainted 4.15.0+ #222 [ 25.498734] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.508061] Call Trace: [ 25.510625] dump_stack+0x194/0x257 [ 25.514228] ? arch_local_irq_restore+0x53/0x53 [ 25.518885] lockdep_rcu_suspicious+0x123/0x170 [ 25.523546] ___might_sleep+0x385/0x470 [ 25.527496] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.533368] ? __debug_object_init+0x235/0x1040 [ 25.538012] ? lock_acquire+0x1d5/0x580 [ 25.541970] ? debug_mutex_init+0x1c/0x60 [ 25.546119] __might_sleep+0x95/0x190 [ 25.549904] kmem_cache_alloc_trace+0x299/0x740 [ 25.554555] ? lock_acquire+0x1d5/0x580 [ 25.558503] ? lock_acquire+0x1d5/0x580 [ 25.562463] ? __rds_conn_create+0xe46/0x1b50 [ 25.566941] rds_loop_conn_alloc+0xc8/0x380 [ 25.571253] ? rds_loop_conn_free+0x290/0x290 [ 25.575739] ? __init_waitqueue_head+0x97/0x140 [ 25.580397] ? rcutorture_record_progress+0x10/0x10 [ 25.585394] ? __lockdep_init_map+0xe4/0x650 [ 25.589794] __rds_conn_create+0x112f/0x1b50 [ 25.594196] ? rds_conn_drop+0xb0/0xb0 [ 25.598069] ? __raw_spin_lock_init+0x1c/0x100 [ 25.602629] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.607626] ? __lockdep_init_map+0xe4/0x650 [ 25.612019] ? lockdep_init_map+0x9/0x10 [ 25.616058] ? __init_waitqueue_head+0x97/0x140 [ 25.620716] ? init_wait_entry+0x1b0/0x1b0 [ 25.624953] ? lockdep_init_map+0x9/0x10 [ 25.629017] ? rds_message_alloc+0x28c/0x330 [ 25.633423] ? rds_message_next_extension+0x210/0x210 [ 25.638597] ? trace_hardirqs_on+0xd/0x10 [ 25.642725] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.647115] ? __release_sock+0x360/0x360 [ 25.651236] ? lock_sock_nested+0x91/0x110 [ 25.655450] rds_conn_create_outgoing+0x3f/0x50 [ 25.660099] rds_sendmsg+0xda3/0x2390 [ 25.663899] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.668380] ? __might_fault+0x110/0x1d0 [ 25.672426] ? lock_release+0xa40/0xa40 [ 25.676386] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.682253] ? find_held_lock+0x35/0x1d0 [ 25.686298] ? sock_has_perm+0x2a4/0x420 [ 25.690347] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.695694] ? lock_downgrade+0x980/0x980 [ 25.699825] ? dup_iter+0x1a2/0x260 [ 25.703441] ? lock_release+0xa40/0xa40 [ 25.707412] ? selinux_socket_sendmsg+0x36/0x40 [ 25.712060] ? security_socket_sendmsg+0x89/0xb0 [ 25.716794] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.721275] sock_sendmsg+0xca/0x110 [ 25.724966] ___sys_sendmsg+0x320/0x8b0 [ 25.728922] ? copy_msghdr_from_user+0x590/0x590 [ 25.733657] ? finish_task_switch+0x29b/0x890 [ 25.738140] ? copy_overflow+0x20/0x20 [ 25.742013] ? __fget_light+0x2b2/0x3c0 [ 25.745968] ? fget_raw+0x20/0x20 [ 25.749413] ? find_held_lock+0x35/0x1d0 [ 25.753468] ? __fdget+0x18/0x20 [ 25.756824] __sys_sendmmsg+0x1ee/0x620 [ 25.760774] ? __sys_sendmmsg+0x1ee/0x620 [ 25.764916] ? SyS_sendmsg+0x50/0x50 [ 25.768617] ? lock_downgrade+0x980/0x980 [ 25.772757] ? handle_mm_fault+0x43b/0x970 [ 25.776987] ? up_read+0x1a/0x40 [ 25.780332] ? __do_page_fault+0x3d6/0xc90 [ 25.784561] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.790080] SyS_sendmmsg+0x35/0x60 [ 25.793685] ? __sys_sendmmsg+0x620/0x620 [ 25.797819] do_syscall_64+0x282/0x940 [ 25.801692] ? __do_page_fault+0xc90/0xc90 [ 25.805913] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.810658] ? syscall_return_slowpath+0x550/0x550 [ 25.815566] ? syscall_return_slowpath+0x2ac/0x550 [ 25.820472] ? prepare_exit_to_usermode+0x350/0x350 [ 25.825467] ? retint_user+0x18/0x18 [ 25.829162] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.834004] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.839170] RIP: 0033:0x43fe29 [ 25.842333] RSP: 002b:00007ffd770a0f58 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 25.850016] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 25.857264] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 25.864510] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 25.871755] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 25.879000] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 25.886354] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.893841] in_atomic(): 1, irqs_disabled(): 0, pid: 4106, name: syzkaller324752 [ 25.901399] 1 lock held by syzkaller324752/4106: [ 25.906168] #0: (rcu_read_lock){....}, at: [<000000001cb10fdf>] __rds_conn_create+0xe46/0x1b50 [ 25.915137] CPU: 0 PID: 4106 Comm: syzkaller324752 Not tainted 4.15.0+ #222 [ 25.922233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.931572] Call Trace: [ 25.934139] dump_stack+0x194/0x257 [ 25.937746] ? arch_local_irq_restore+0x53/0x53 [ 25.942393] ? print_lock+0x9f/0xa2 [ 25.945999] ? lockdep_print_held_locks+0xc4/0x130 [ 25.950913] ___might_sleep+0x2b2/0x470 [ 25.954868] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.960733] ? __debug_object_init+0x235/0x1040 [ 25.965389] ? lock_acquire+0x1d5/0x580 [ 25.969349] ? debug_mutex_init+0x1c/0x60 [ 25.973485] __might_sleep+0x95/0x190 [ 25.977269] kmem_cache_alloc_trace+0x299/0x740 [ 25.981917] ? lock_acquire+0x1d5/0x580 [ 25.985868] ? lock_acquire+0x1d5/0x580 [ 25.989825] ? __rds_conn_create+0xe46/0x1b50 [ 25.994305] rds_loop_conn_alloc+0xc8/0x380 [ 25.998606] ? rds_loop_conn_free+0x290/0x290 [ 26.003092] ? __init_waitqueue_head+0x97/0x140 [ 26.007759] ? rcutorture_record_progress+0x10/0x10 [ 26.012759] ? __lockdep_init_map+0xe4/0x650 [ 26.017162] __rds_conn_create+0x112f/0x1b50 [ 26.021566] ? rds_conn_drop+0xb0/0xb0 [ 26.025440] ? __raw_spin_lock_init+0x1c/0x100 [ 26.030007] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.035020] ? __lockdep_init_map+0xe4/0x650 [ 26.039416] ? lockdep_init_map+0x9/0x10 [ 26.043454] ? __init_waitqueue_head+0x97/0x140 [ 26.048099] ? init_wait_entry+0x1b0/0x1b0 [ 26.052322] ? lockdep_init_map+0x9/0x10 [ 26.056362] ? rds_message_alloc+0x28c/0x330 [ 26.060757] ? rds_message_next_extension+0x210/0x210 [ 26.065923] ? trace_hardirqs_on+0xd/0x10 [ 26.070054] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.074465] ? __release_sock+0x360/0x360 [ 26.078603] ? lock_sock_nested+0x91/0x110 [ 26.082826] rds_conn_create_outgoing+0x3f/0x50 [ 26.087486] rds_sendmsg+0xda3/0x2390 [ 26.091295] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.095783] ? __might_fault+0x110/0x1d0 [ 26.099833] ? lock_release+0xa40/0xa40 [ 26.103785] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.109652] ? find_held_lock+0x35/0x1d0 [ 26.113706] ? sock_has_perm+0x2a4/0x420 [ 26.117750] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.123105] ? lock_downgrade+0x980/0x980 [ 26.127227] ? dup_iter+0x1a2/0x260 [ 26.130835] ? lock_release+0xa40/0xa40 [ 26.134811] ? selinux_socket_sendmsg+0x36/0x40 [ 26.139467] ? security_socket_sendmsg+0x89/0xb0 [ 26.144205] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.148692] sock_sendmsg+0xca/0x110 [ 26.152386] ___sys_sendmsg+0x320/0x8b0 [ 26.156350] ? copy_msghdr_from_user+0x590/0x590 [ 26.161087] ? finish_task_switch+0x29b/0x890 [ 26.165570] ? copy_overflow+0x20/0x20 [ 26.169454] ? __fget_light+0x2b2/0x3c0 [ 26.173407] ? fget_raw+0x20/0x20 [ 26.176855] ? find_held_lock+0x35/0x1d0 [ 26.180919] ? __fdget+0x18/0x20 [ 26.184275] __sys_sendmmsg+0x1ee/0x620 [ 26.188225] ? __sys_sendmmsg+0x1ee/0x620 [ 26.192356] ? SyS_sendmsg+0x50/0x50 [ 26.196055] ? lock_downgrade+0x980/0x980 [ 26.200189] ? handle_mm_fault+0x43b/0x970 [ 26.204414] ? up_read+0x1a/0x40 [ 26.207759] ? __do_page_fault+0x3d6/0xc90 [ 26.211982] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.217512] SyS_sendmmsg+0x35/0x60 [ 26.221123] ? __sys_sendmmsg+0x620/0x620 [ 26.225261] do_syscall_64+0x282/0x940 [ 26.229124] ? __do_page_fault+0xc90/0xc90 [ 26.233349] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.238084] ? syscall_return_slowpath+0x550/0x550 [ 26.242990] ? syscall_return_slowpath+0x2ac/0x550 [ 26.247899] ? prepare_exit_to_usermode+0x350/0x350 [ 26.252898] ? retint_user+0x18/0x18 [ 26.256591] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.261416] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.266579] RIP: 0033:0x43fe29 [ 26.269754] RSP: 002b:00007ffd770a0f58 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 26.277437] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 26.284682] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 26.291925] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 26.299168] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 26.3