[?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. [ 17.245754] audit: type=1400 audit(1518306223.852:6): 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 23.575698] audit: type=1400 audit(1518306230.182:7): avc: denied { map } for pid=4160 comm="syzkaller020591" path="/root/syzkaller020591978" 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 [ 23.604330] [ 23.606043] ============================= [ 23.610219] WARNING: suspicious RCU usage [ 23.614370] 4.15.0+ #222 Not tainted [ 23.618083] ----------------------------- [ 23.622232] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 23.631503] [ 23.631503] other info that might help us debug this: [ 23.631503] [ 23.639670] [ 23.639670] rcu_scheduler_active = 2, debug_locks = 1 [ 23.646362] 1 lock held by syzkaller020591/4160: [ 23.651110] #0: (rcu_read_lock){....}, at: [<00000000553caf78>] __rds_conn_create+0xe46/0x1b50 [ 23.660058] [ 23.660058] stack backtrace: [ 23.664556] CPU: 0 PID: 4160 Comm: syzkaller020591 Not tainted 4.15.0+ #222 [ 23.671624] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.680948] Call Trace: [ 23.683510] dump_stack+0x194/0x257 [ 23.687111] ? arch_local_irq_restore+0x53/0x53 [ 23.691763] lockdep_rcu_suspicious+0x123/0x170 [ 23.696409] ___might_sleep+0x385/0x470 [ 23.700357] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 23.706211] ? __debug_object_init+0x235/0x1040 [ 23.710849] ? lock_acquire+0x1d5/0x580 [ 23.714808] ? debug_mutex_init+0x1c/0x60 [ 23.718938] __might_sleep+0x95/0x190 [ 23.722718] kmem_cache_alloc_trace+0x299/0x740 [ 23.727360] ? lock_acquire+0x1d5/0x580 [ 23.731306] ? lock_acquire+0x1d5/0x580 [ 23.735252] ? __rds_conn_create+0xe46/0x1b50 [ 23.739722] rds_loop_conn_alloc+0xc8/0x380 [ 23.744023] ? rds_loop_conn_free+0x290/0x290 [ 23.748496] ? __init_waitqueue_head+0x97/0x140 [ 23.753141] ? rcutorture_record_progress+0x10/0x10 [ 23.758136] ? __lockdep_init_map+0xe4/0x650 [ 23.762522] __rds_conn_create+0x112f/0x1b50 [ 23.766919] ? rds_conn_drop+0xb0/0xb0 [ 23.770787] ? __raw_spin_lock_init+0x1c/0x100 [ 23.775341] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.780332] ? __lockdep_init_map+0xe4/0x650 [ 23.784714] ? lockdep_init_map+0x9/0x10 [ 23.788748] ? __init_waitqueue_head+0x97/0x140 [ 23.793392] ? init_wait_entry+0x1b0/0x1b0 [ 23.797605] ? lockdep_init_map+0x9/0x10 [ 23.801640] ? rds_message_alloc+0x28c/0x330 [ 23.806027] ? rds_message_next_extension+0x210/0x210 [ 23.811189] ? trace_hardirqs_on+0xd/0x10 [ 23.815314] ? _raw_spin_unlock_bh+0x30/0x40 [ 23.819698] ? __release_sock+0x360/0x360 [ 23.823816] ? lock_sock_nested+0x91/0x110 [ 23.828032] rds_conn_create_outgoing+0x3f/0x50 [ 23.832678] rds_sendmsg+0xda3/0x2390 [ 23.836465] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.840931] ? __might_fault+0x110/0x1d0 [ 23.844971] ? lock_release+0xa40/0xa40 [ 23.848915] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 23.854775] ? find_held_lock+0x35/0x1d0 [ 23.858811] ? sock_has_perm+0x2a4/0x420 [ 23.862847] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 23.868181] ? lock_downgrade+0x980/0x980 [ 23.872300] ? dup_iter+0x1a2/0x260 [ 23.875901] ? lock_release+0xa40/0xa40 [ 23.879858] ? selinux_socket_sendmsg+0x36/0x40 [ 23.884500] ? security_socket_sendmsg+0x89/0xb0 [ 23.889227] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.893695] sock_sendmsg+0xca/0x110 [ 23.897386] ___sys_sendmsg+0x320/0x8b0 [ 23.901343] ? copy_msghdr_from_user+0x590/0x590 [ 23.906070] ? finish_task_switch+0x29b/0x890 [ 23.910540] ? copy_overflow+0x20/0x20 [ 23.914410] ? __fget_light+0x2b2/0x3c0 [ 23.918356] ? fget_raw+0x20/0x20 [ 23.921801] ? find_held_lock+0x35/0x1d0 [ 23.925841] ? __fdget+0x18/0x20 [ 23.929183] __sys_sendmmsg+0x1ee/0x620 [ 23.933134] ? __sys_sendmmsg+0x1ee/0x620 [ 23.937259] ? SyS_sendmsg+0x50/0x50 [ 23.940945] ? lock_downgrade+0x980/0x980 [ 23.945070] ? handle_mm_fault+0x43b/0x970 [ 23.949287] ? up_read+0x1a/0x40 [ 23.952629] ? __do_page_fault+0x3d6/0xc90 [ 23.956845] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 23.962369] SyS_sendmmsg+0x35/0x60 [ 23.965968] ? __sys_sendmmsg+0x620/0x620 [ 23.970088] do_syscall_64+0x282/0x940 [ 23.973946] ? __do_page_fault+0xc90/0xc90 [ 23.978150] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 23.982880] ? syscall_return_slowpath+0x550/0x550 [ 23.987784] ? syscall_return_slowpath+0x2ac/0x550 [ 23.992693] ? prepare_exit_to_usermode+0x350/0x350 [ 23.997682] ? retint_user+0x18/0x18 [ 24.001374] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.006195] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.011355] RIP: 0033:0x43fe29 [ 24.014514] RSP: 002b:00007ffda9d24b28 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 24.022193] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 24.029432] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 24.036675] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 24.043916] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 24.051158] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 24.058465] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.065929] in_atomic(): 1, irqs_disabled(): 0, pid: 4160, name: syzkaller020591 [ 24.073475] 1 lock held by syzkaller020591/4160: [ 24.078236] #0: (rcu_read_lock){....}, at: [<00000000553caf78>] __rds_conn_create+0xe46/0x1b50 [ 24.087192] CPU: 0 PID: 4160 Comm: syzkaller020591 Not tainted 4.15.0+ #222 [ 24.094269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.103593] Call Trace: [ 24.106158] dump_stack+0x194/0x257 [ 24.109759] ? arch_local_irq_restore+0x53/0x53 [ 24.114400] ? print_lock+0x9f/0xa2 [ 24.117998] ? lockdep_print_held_locks+0xc4/0x130 [ 24.122914] ___might_sleep+0x2b2/0x470 [ 24.127270] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.133125] ? __debug_object_init+0x235/0x1040 [ 24.137763] ? lock_acquire+0x1d5/0x580 [ 24.141710] ? debug_mutex_init+0x1c/0x60 [ 24.145837] __might_sleep+0x95/0x190 [ 24.149617] kmem_cache_alloc_trace+0x299/0x740 [ 24.154258] ? lock_acquire+0x1d5/0x580 [ 24.158209] ? lock_acquire+0x1d5/0x580 [ 24.162159] ? __rds_conn_create+0xe46/0x1b50 [ 24.166632] rds_loop_conn_alloc+0xc8/0x380 [ 24.170926] ? rds_loop_conn_free+0x290/0x290 [ 24.175397] ? __init_waitqueue_head+0x97/0x140 [ 24.180042] ? rcutorture_record_progress+0x10/0x10 [ 24.185036] ? __lockdep_init_map+0xe4/0x650 [ 24.189424] __rds_conn_create+0x112f/0x1b50 [ 24.193823] ? rds_conn_drop+0xb0/0xb0 [ 24.197693] ? __raw_spin_lock_init+0x1c/0x100 [ 24.202249] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.207244] ? __lockdep_init_map+0xe4/0x650 [ 24.211630] ? lockdep_init_map+0x9/0x10 [ 24.215662] ? __init_waitqueue_head+0x97/0x140 [ 24.220303] ? init_wait_entry+0x1b0/0x1b0 [ 24.224515] ? lockdep_init_map+0x9/0x10 [ 24.228549] ? rds_message_alloc+0x28c/0x330 [ 24.232931] ? rds_message_next_extension+0x210/0x210 [ 24.238089] ? trace_hardirqs_on+0xd/0x10 [ 24.242213] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.246598] ? __release_sock+0x360/0x360 [ 24.250715] ? lock_sock_nested+0x91/0x110 [ 24.254927] rds_conn_create_outgoing+0x3f/0x50 [ 24.259570] rds_sendmsg+0xda3/0x2390 [ 24.263356] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.267827] ? __might_fault+0x110/0x1d0 [ 24.271866] ? lock_release+0xa40/0xa40 [ 24.275811] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.281672] ? find_held_lock+0x35/0x1d0 [ 24.285711] ? sock_has_perm+0x2a4/0x420 [ 24.289746] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.295078] ? lock_downgrade+0x980/0x980 [ 24.299198] ? dup_iter+0x1a2/0x260 [ 24.302798] ? lock_release+0xa40/0xa40 [ 24.306757] ? selinux_socket_sendmsg+0x36/0x40 [ 24.311398] ? security_socket_sendmsg+0x89/0xb0 [ 24.316132] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.320601] sock_sendmsg+0xca/0x110 [ 24.324289] ___sys_sendmsg+0x320/0x8b0 [ 24.328238] ? copy_msghdr_from_user+0x590/0x590 [ 24.332968] ? finish_task_switch+0x29b/0x890 [ 24.337437] ? copy_overflow+0x20/0x20 [ 24.341303] ? __fget_light+0x2b2/0x3c0 [ 24.345251] ? fget_raw+0x20/0x20 [ 24.348690] ? find_held_lock+0x35/0x1d0 [ 24.352727] ? __fdget+0x18/0x20 [ 24.356068] __sys_sendmmsg+0x1ee/0x620 [ 24.360016] ? __sys_sendmmsg+0x1ee/0x620 [ 24.364147] ? SyS_sendmsg+0x50/0x50 [ 24.367835] ? lock_downgrade+0x980/0x980 [ 24.371961] ? handle_mm_fault+0x43b/0x970 [ 24.376179] ? up_read+0x1a/0x40 [ 24.379521] ? __do_page_fault+0x3d6/0xc90 [ 24.383739] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.389254] SyS_sendmmsg+0x35/0x60 [ 24.392854] ? __sys_sendmmsg+0x620/0x620 [ 24.396975] do_syscall_64+0x282/0x940 [ 24.400833] ? __do_page_fault+0xc90/0xc90 [ 24.405040] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.409770] ? syscall_return_slowpath+0x550/0x550 [ 24.414674] ? syscall_return_slowpath+0x2ac/0x550 [ 24.419577] ? prepare_exit_to_usermode+0x350/0x350 [ 24.424566] ? retint_user+0x18/0x18 [ 24.428255] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.433075] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.438235] RIP: 0033:0x43fe29 [ 24.441396] RSP: 002b:00007ffda9d24b28 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 24.449073] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 24.456316] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 24.463555] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 24.470798] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 24.478042] R13: