[?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. [ 18.013528] audit: type=1400 audit(1518381313.990:6): 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 '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.296944] audit: type=1400 audit(1518381320.273:7): avc: denied { map } for pid=4160 comm="syzkaller205523" path="/root/syzkaller205523557" 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 [ 24.323778] [ 24.325454] ============================= [ 24.329605] WARNING: suspicious RCU usage [ 24.333751] 4.15.0+ #308 Not tainted [ 24.337464] ----------------------------- [ 24.341612] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.350896] [ 24.350896] other info that might help us debug this: [ 24.350896] [ 24.359050] [ 24.359050] rcu_scheduler_active = 2, debug_locks = 1 [ 24.365720] 1 lock held by syzkaller205523/4160: [ 24.370469] #0: (rcu_read_lock){....}, at: [<00000000d6d91388>] __rds_conn_create+0xe46/0x1b50 [ 24.379412] [ 24.379412] stack backtrace: [ 24.383910] CPU: 1 PID: 4160 Comm: syzkaller205523 Not tainted 4.15.0+ #308 [ 24.390980] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.400306] Call Trace: [ 24.402874] dump_stack+0x194/0x257 [ 24.406483] ? arch_local_irq_restore+0x53/0x53 [ 24.411139] lockdep_rcu_suspicious+0x123/0x170 [ 24.415785] ___might_sleep+0x385/0x470 [ 24.419736] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.425592] ? __debug_object_init+0x235/0x1040 [ 24.430237] ? debug_mutex_init+0x1c/0x60 [ 24.434365] __might_sleep+0x95/0x190 [ 24.438154] kmem_cache_alloc_trace+0x299/0x740 [ 24.442799] ? lock_acquire+0x1d5/0x580 [ 24.446746] ? lock_acquire+0x1d5/0x580 [ 24.450695] ? __rds_conn_create+0xe46/0x1b50 [ 24.455179] rds_loop_conn_alloc+0xc8/0x380 [ 24.459494] ? rds_loop_conn_free+0x290/0x290 [ 24.463974] ? __init_waitqueue_head+0x97/0x140 [ 24.468625] ? rcutorture_record_progress+0x10/0x10 [ 24.473619] ? __lockdep_init_map+0xe4/0x650 [ 24.478018] __rds_conn_create+0x112f/0x1b50 [ 24.482429] ? rds_conn_drop+0xb0/0xb0 [ 24.486299] ? __raw_spin_lock_init+0x1c/0x100 [ 24.490863] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.495858] ? __lockdep_init_map+0xe4/0x650 [ 24.500244] ? lockdep_init_map+0x9/0x10 [ 24.504281] ? __init_waitqueue_head+0x97/0x140 [ 24.508925] ? init_wait_entry+0x1b0/0x1b0 [ 24.513140] ? lockdep_init_map+0x9/0x10 [ 24.517177] ? rds_message_alloc+0x28c/0x330 [ 24.521565] ? rds_message_next_extension+0x210/0x210 [ 24.526725] ? trace_hardirqs_on+0xd/0x10 [ 24.530849] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.535237] ? __release_sock+0x360/0x360 [ 24.539356] ? lock_sock_nested+0x91/0x110 [ 24.543583] rds_conn_create_outgoing+0x3f/0x50 [ 24.548244] rds_sendmsg+0xda3/0x2390 [ 24.552027] ? avc_has_perm+0x43e/0x680 [ 24.555992] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.560468] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.564942] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.569934] ? find_held_lock+0x35/0x1d0 [ 24.573978] ? sock_has_perm+0x2a4/0x420 [ 24.578020] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.583371] ? lock_release+0xa22/0xa40 [ 24.587328] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.593187] ? __check_object_size+0x8b/0x530 [ 24.597656] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.602130] ? __might_sleep+0x95/0x190 [ 24.606087] ? selinux_socket_sendmsg+0x36/0x40 [ 24.610728] ? security_socket_sendmsg+0x89/0xb0 [ 24.615461] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.619936] sock_sendmsg+0xca/0x110 [ 24.623643] SYSC_sendto+0x361/0x5c0 [ 24.627334] ? SYSC_connect+0x4a0/0x4a0 [ 24.631293] ? __do_page_fault+0x5f7/0xc90 [ 24.635502] ? lock_downgrade+0x980/0x980 [ 24.639644] ? handle_mm_fault+0x43b/0x970 [ 24.643870] ? up_read+0x1a/0x40 [ 24.647214] ? __do_page_fault+0x3d6/0xc90 [ 24.651433] ? mm_fault_error+0x2c0/0x2c0 [ 24.655560] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.661076] SyS_sendto+0x40/0x50 [ 24.664508] ? SyS_getpeername+0x30/0x30 [ 24.668543] do_syscall_64+0x282/0x940 [ 24.672404] ? __do_page_fault+0xc90/0xc90 [ 24.676612] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.681344] ? syscall_return_slowpath+0x550/0x550 [ 24.686257] ? syscall_return_slowpath+0x2ac/0x550 [ 24.691162] ? prepare_exit_to_usermode+0x350/0x350 [ 24.696155] ? retint_user+0x18/0x18 [ 24.699852] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.704678] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.709842] RIP: 0033:0x43fd99 [ 24.713016] RSP: 002b:00007ffd0780d668 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.720708] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.727951] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 24.735194] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 24.742448] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.749690] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 24.757214] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.764669] in_atomic(): 1, irqs_disabled(): 0, pid: 4160, name: syzkaller205523 [ 24.772206] 1 lock held by syzkaller205523/4160: [ 24.776957] #0: (rcu_read_lock){....}, at: [<00000000d6d91388>] __rds_conn_create+0xe46/0x1b50 [ 24.785908] CPU: 1 PID: 4160 Comm: syzkaller205523 Not tainted 4.15.0+ #308 [ 24.792987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.802314] Call Trace: [ 24.804880] dump_stack+0x194/0x257 [ 24.808486] ? arch_local_irq_restore+0x53/0x53 [ 24.813129] ? print_lock+0x9f/0xa2 [ 24.816729] ? lockdep_print_held_locks+0xc4/0x130 [ 24.821637] ___might_sleep+0x2b2/0x470 [ 24.825585] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.831451] ? __debug_object_init+0x235/0x1040 [ 24.836104] ? debug_mutex_init+0x1c/0x60 [ 24.840231] __might_sleep+0x95/0x190 [ 24.844019] kmem_cache_alloc_trace+0x299/0x740 [ 24.848669] ? lock_acquire+0x1d5/0x580 [ 24.852616] ? lock_acquire+0x1d5/0x580 [ 24.856567] ? __rds_conn_create+0xe46/0x1b50 [ 24.861052] rds_loop_conn_alloc+0xc8/0x380 [ 24.865356] ? rds_loop_conn_free+0x290/0x290 [ 24.869825] ? __init_waitqueue_head+0x97/0x140 [ 24.874476] ? rcutorture_record_progress+0x10/0x10 [ 24.879468] ? __lockdep_init_map+0xe4/0x650 [ 24.883853] __rds_conn_create+0x112f/0x1b50 [ 24.888252] ? rds_conn_drop+0xb0/0xb0 [ 24.892123] ? __raw_spin_lock_init+0x1c/0x100 [ 24.896683] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.901677] ? __lockdep_init_map+0xe4/0x650 [ 24.906064] ? lockdep_init_map+0x9/0x10 [ 24.910098] ? __init_waitqueue_head+0x97/0x140 [ 24.914741] ? init_wait_entry+0x1b0/0x1b0 [ 24.918956] ? lockdep_init_map+0x9/0x10 [ 24.922994] ? rds_message_alloc+0x28c/0x330 [ 24.927381] ? rds_message_next_extension+0x210/0x210 [ 24.932543] ? trace_hardirqs_on+0xd/0x10 [ 24.936680] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.941075] ? __release_sock+0x360/0x360 [ 24.945194] ? lock_sock_nested+0x91/0x110 [ 24.949410] rds_conn_create_outgoing+0x3f/0x50 [ 24.954056] rds_sendmsg+0xda3/0x2390 [ 24.957837] ? avc_has_perm+0x43e/0x680 [ 24.961809] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.966283] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.970755] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.975763] ? find_held_lock+0x35/0x1d0 [ 24.979805] ? sock_has_perm+0x2a4/0x420 [ 24.983846] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.989184] ? lock_release+0xa22/0xa40 [ 24.993132] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.998993] ? __check_object_size+0x8b/0x530 [ 25.003468] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.007943] ? __might_sleep+0x95/0x190 [ 25.011898] ? selinux_socket_sendmsg+0x36/0x40 [ 25.016542] ? security_socket_sendmsg+0x89/0xb0 [ 25.021273] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.025746] sock_sendmsg+0xca/0x110 [ 25.029439] SYSC_sendto+0x361/0x5c0 [ 25.033133] ? SYSC_connect+0x4a0/0x4a0 [ 25.037089] ? __do_page_fault+0x5f7/0xc90 [ 25.041305] ? lock_downgrade+0x980/0x980 [ 25.045438] ? handle_mm_fault+0x43b/0x970 [ 25.049657] ? up_read+0x1a/0x40 [ 25.053000] ? __do_page_fault+0x3d6/0xc90 [ 25.057220] ? mm_fault_error+0x2c0/0x2c0 [ 25.061344] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.066861] SyS_sendto+0x40/0x50 [ 25.070288] ? SyS_getpeername+0x30/0x30 [ 25.074323] do_syscall_64+0x282/0x940 [ 25.078181] ? __do_page_fault+0xc90/0xc90 [ 25.082389] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.087120] ? syscall_return_slowpath+0x550/0x550 [ 25.092032] ? syscall_return_slowpath+0x2ac/0x550 [ 25.096939] ? prepare_exit_to_usermode+0x350/0x350 [ 25.101932] ? retint_user+0x18/0x18 [ 25.105626] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.110448] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.115616] RIP: 0033:0x43fd99 [ 25.118778] RSP: 002b:00007ffd0780d668 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.126457] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.133718] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.140960] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 25.148205] R10: 0000000000