[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 17.368677] audit: type=1400 audit(1518415310.397:6): avc: denied { map } for pid=4152 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 23.650627] audit: type=1400 audit(1518415316.679:7): avc: denied { map } for pid=4166 comm="syzkaller372056" path="/root/syzkaller372056457" 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 [ 23.677636] [ 23.679325] ============================= [ 23.683578] WARNING: suspicious RCU usage [ 23.687733] 4.15.0+ #222 Not tainted [ 23.691441] ----------------------------- [ 23.695593] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 23.704870] [ 23.704870] other info that might help us debug this: [ 23.704870] [ 23.713028] [ 23.713028] rcu_scheduler_active = 2, debug_locks = 1 [ 23.719693] 1 lock held by syzkaller372056/4166: [ 23.724450] #0: (rcu_read_lock){....}, at: [<00000000a386ae82>] __rds_conn_create+0xe46/0x1b50 [ 23.733402] [ 23.733402] stack backtrace: [ 23.737906] CPU: 1 PID: 4166 Comm: syzkaller372056 Not tainted 4.15.0+ #222 [ 23.744982] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.754306] Call Trace: [ 23.756865] dump_stack+0x194/0x257 [ 23.760468] ? arch_local_irq_restore+0x53/0x53 [ 23.765119] lockdep_rcu_suspicious+0x123/0x170 [ 23.769763] ___might_sleep+0x385/0x470 [ 23.773709] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 23.779564] ? __debug_object_init+0x235/0x1040 [ 23.784209] ? debug_mutex_init+0x1c/0x60 [ 23.788335] __might_sleep+0x95/0x190 [ 23.792112] kmem_cache_alloc_trace+0x299/0x740 [ 23.796752] ? lock_acquire+0x1d5/0x580 [ 23.800698] ? lock_acquire+0x1d5/0x580 [ 23.804644] ? __rds_conn_create+0xe46/0x1b50 [ 23.809115] rds_loop_conn_alloc+0xc8/0x380 [ 23.813409] ? rds_loop_conn_free+0x290/0x290 [ 23.817881] ? __init_waitqueue_head+0x97/0x140 [ 23.822523] ? rcutorture_record_progress+0x10/0x10 [ 23.827510] ? __lockdep_init_map+0xe4/0x650 [ 23.831896] __rds_conn_create+0x112f/0x1b50 [ 23.836293] ? rds_conn_drop+0xb0/0xb0 [ 23.840162] ? __raw_spin_lock_init+0x1c/0x100 [ 23.844716] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.849708] ? __lockdep_init_map+0xe4/0x650 [ 23.854089] ? lockdep_init_map+0x9/0x10 [ 23.858120] ? __init_waitqueue_head+0x97/0x140 [ 23.862760] ? init_wait_entry+0x1b0/0x1b0 [ 23.866971] ? lockdep_init_map+0x9/0x10 [ 23.871010] ? rds_message_alloc+0x28c/0x330 [ 23.875397] ? rds_message_next_extension+0x210/0x210 [ 23.880555] ? trace_hardirqs_on+0xd/0x10 [ 23.884677] ? _raw_spin_unlock_bh+0x30/0x40 [ 23.889148] ? __release_sock+0x360/0x360 [ 23.893264] ? lock_sock_nested+0x91/0x110 [ 23.897473] rds_conn_create_outgoing+0x3f/0x50 [ 23.902118] rds_sendmsg+0xda3/0x2390 [ 23.905888] ? avc_has_perm+0x43e/0x680 [ 23.909847] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.914316] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.918786] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.923778] ? find_held_lock+0x35/0x1d0 [ 23.927821] ? sock_has_perm+0x2a4/0x420 [ 23.931854] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 23.937192] ? lock_release+0xa02/0xa40 [ 23.941137] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 23.946991] ? __check_object_size+0x8b/0x530 [ 23.951463] ? __handle_mm_fault+0x80e/0x3ce0 [ 23.955934] ? __might_sleep+0x95/0x190 [ 23.959884] ? selinux_socket_sendmsg+0x36/0x40 [ 23.964526] ? security_socket_sendmsg+0x89/0xb0 [ 23.969253] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.973723] sock_sendmsg+0xca/0x110 [ 23.977409] SYSC_sendto+0x361/0x5c0 [ 23.981100] ? SYSC_connect+0x4a0/0x4a0 [ 23.985050] ? __do_page_fault+0x5f7/0xc90 [ 23.989256] ? lock_downgrade+0x980/0x980 [ 23.993381] ? handle_mm_fault+0x43b/0x970 [ 23.997607] ? up_read+0x1a/0x40 [ 24.000948] ? __do_page_fault+0x3d6/0xc90 [ 24.005159] ? mm_fault_error+0x2c0/0x2c0 [ 24.009279] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.014792] SyS_sendto+0x40/0x50 [ 24.018216] ? SyS_getpeername+0x30/0x30 [ 24.022249] do_syscall_64+0x282/0x940 [ 24.026106] ? __do_page_fault+0xc90/0xc90 [ 24.030315] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.035052] ? syscall_return_slowpath+0x550/0x550 [ 24.039961] ? syscall_return_slowpath+0x2ac/0x550 [ 24.044863] ? prepare_exit_to_usermode+0x350/0x350 [ 24.049850] ? retint_user+0x18/0x18 [ 24.053539] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.058359] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.063521] RIP: 0033:0x43fd99 [ 24.066679] RSP: 002b:00007ffe95447468 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.074355] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.081594] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 24.088833] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 24.096075] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.103314] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 24.110638] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.118088] in_atomic(): 1, irqs_disabled(): 0, pid: 4166, name: syzkaller372056 [ 24.125621] 1 lock held by syzkaller372056/4166: [ 24.130373] #0: (rcu_read_lock){....}, at: [<00000000a386ae82>] __rds_conn_create+0xe46/0x1b50 [ 24.139323] CPU: 1 PID: 4166 Comm: syzkaller372056 Not tainted 4.15.0+ #222 [ 24.146400] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.156071] Call Trace: [ 24.158638] dump_stack+0x194/0x257 [ 24.162241] ? arch_local_irq_restore+0x53/0x53 [ 24.166882] ? print_lock+0x9f/0xa2 [ 24.170479] ? lockdep_print_held_locks+0xc4/0x130 [ 24.175388] ___might_sleep+0x2b2/0x470 [ 24.179333] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.185189] ? __debug_object_init+0x235/0x1040 [ 24.189833] ? debug_mutex_init+0x1c/0x60 [ 24.193956] __might_sleep+0x95/0x190 [ 24.197733] kmem_cache_alloc_trace+0x299/0x740 [ 24.202379] ? lock_acquire+0x1d5/0x580 [ 24.206324] ? lock_acquire+0x1d5/0x580 [ 24.210272] ? __rds_conn_create+0xe46/0x1b50 [ 24.214741] rds_loop_conn_alloc+0xc8/0x380 [ 24.219037] ? rds_loop_conn_free+0x290/0x290 [ 24.223505] ? __init_waitqueue_head+0x97/0x140 [ 24.228147] ? rcutorture_record_progress+0x10/0x10 [ 24.233135] ? __lockdep_init_map+0xe4/0x650 [ 24.237520] __rds_conn_create+0x112f/0x1b50 [ 24.241918] ? rds_conn_drop+0xb0/0xb0 [ 24.245788] ? __raw_spin_lock_init+0x1c/0x100 [ 24.250341] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.255336] ? __lockdep_init_map+0xe4/0x650 [ 24.259719] ? lockdep_init_map+0x9/0x10 [ 24.263752] ? __init_waitqueue_head+0x97/0x140 [ 24.268394] ? init_wait_entry+0x1b0/0x1b0 [ 24.272602] ? lockdep_init_map+0x9/0x10 [ 24.276639] ? rds_message_alloc+0x28c/0x330 [ 24.281018] ? rds_message_next_extension+0x210/0x210 [ 24.286177] ? trace_hardirqs_on+0xd/0x10 [ 24.290307] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.294697] ? __release_sock+0x360/0x360 [ 24.298812] ? lock_sock_nested+0x91/0x110 [ 24.303021] rds_conn_create_outgoing+0x3f/0x50 [ 24.307664] rds_sendmsg+0xda3/0x2390 [ 24.311434] ? avc_has_perm+0x43e/0x680 [ 24.315392] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.319858] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.324326] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.329317] ? find_held_lock+0x35/0x1d0 [ 24.333361] ? sock_has_perm+0x2a4/0x420 [ 24.337401] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.342739] ? lock_release+0xa02/0xa40 [ 24.346684] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.352541] ? __check_object_size+0x8b/0x530 [ 24.357008] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.361484] ? __might_sleep+0x95/0x190 [ 24.365436] ? selinux_socket_sendmsg+0x36/0x40 [ 24.370081] ? security_socket_sendmsg+0x89/0xb0 [ 24.374810] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.379279] sock_sendmsg+0xca/0x110 [ 24.382965] SYSC_sendto+0x361/0x5c0 [ 24.386653] ? SYSC_connect+0x4a0/0x4a0 [ 24.390603] ? __do_page_fault+0x5f7/0xc90 [ 24.394812] ? lock_downgrade+0x980/0x980 [ 24.398937] ? handle_mm_fault+0x43b/0x970 [ 24.403154] ? up_read+0x1a/0x40 [ 24.406494] ? __do_page_fault+0x3d6/0xc90 [ 24.410707] ? mm_fault_error+0x2c0/0x2c0 [ 24.414831] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.420341] SyS_sendto+0x40/0x50 [ 24.423766] ? SyS_getpeername+0x30/0x30 [ 24.427799] do_syscall_64+0x282/0x940 [ 24.431657] ? __do_page_fault+0xc90/0xc90 [ 24.435865] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.440595] ? syscall_return_slowpath+0x550/0x550 [ 24.445502] ? syscall_return_slowpath+0x2ac/0x550 [ 24.450404] ? prepare_exit_to_usermode+0x350/0x350 [ 24.455394] ? retint_user+0x18/0x18 [ 24.459082] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.463900] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.469058] RIP: 0033:0x43fd99 [ 24.472220] RSP: 002b:00007ffe95447468 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.479898] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.487138] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 24.494380] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 24.501621] R10: 000000000000