[....] Starting enhanced syslogd: rsyslogd[ 15.980667] audit: type=1400 audit(1518290818.730:5): avc: denied { syslog } for pid=3998 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: [ 18.728610] audit: type=1400 audit(1518290821.478:6): avc: denied { map } for pid=4136 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 '10.128.0.62' (ECDSA) to the list of known hosts. executing program [ 28.866526] audit: type=1400 audit(1518290831.616:7): avc: denied { map } for pid=4152 comm="syzkaller464825" path="/root/syzkaller464825412" 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 [ 28.893777] [ 28.895571] ============================= [ 28.899728] WARNING: suspicious RCU usage [ 28.903887] 4.15.0+ #217 Not tainted [ 28.907610] ----------------------------- [ 28.911769] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.921054] [ 28.921054] other info that might help us debug this: [ 28.921054] [ 28.929206] [ 28.929206] rcu_scheduler_active = 2, debug_locks = 1 [ 28.935884] 1 lock held by syzkaller464825/4152: [ 28.940647] #0: (rcu_read_lock){....}, at: [<000000005fe1eb2b>] __rds_conn_create+0xe46/0x1b50 [ 28.949599] [ 28.949599] stack backtrace: [ 28.954109] CPU: 0 PID: 4152 Comm: syzkaller464825 Not tainted 4.15.0+ #217 [ 28.961179] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.970503] Call Trace: [ 28.973081] dump_stack+0x194/0x257 [ 28.976686] ? arch_local_irq_restore+0x53/0x53 [ 28.981357] lockdep_rcu_suspicious+0x123/0x170 [ 28.986007] ___might_sleep+0x385/0x470 [ 28.989956] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.995814] ? __debug_object_init+0x235/0x1040 [ 29.000462] ? debug_mutex_init+0x1c/0x60 [ 29.004590] __might_sleep+0x95/0x190 [ 29.008371] kmem_cache_alloc_trace+0x299/0x740 [ 29.013021] ? lock_acquire+0x1d5/0x580 [ 29.016983] ? lock_acquire+0x1d5/0x580 [ 29.020932] ? __rds_conn_create+0xe46/0x1b50 [ 29.025406] rds_loop_conn_alloc+0xc8/0x380 [ 29.029702] ? rds_loop_conn_free+0x290/0x290 [ 29.034173] ? __init_waitqueue_head+0x97/0x140 [ 29.038822] ? rcutorture_record_progress+0x10/0x10 [ 29.043817] ? __lockdep_init_map+0xe4/0x650 [ 29.048206] __rds_conn_create+0x112f/0x1b50 [ 29.052606] ? rds_conn_drop+0xb0/0xb0 [ 29.056477] ? __raw_spin_lock_init+0x1c/0x100 [ 29.061043] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.066046] ? __lockdep_init_map+0xe4/0x650 [ 29.070433] ? lockdep_init_map+0x9/0x10 [ 29.074467] ? __init_waitqueue_head+0x97/0x140 [ 29.079113] ? init_wait_entry+0x1b0/0x1b0 [ 29.083327] ? lockdep_init_map+0x9/0x10 [ 29.087365] ? rds_message_alloc+0x28c/0x330 [ 29.091744] ? rds_message_next_extension+0x210/0x210 [ 29.096905] ? trace_hardirqs_on+0xd/0x10 [ 29.101046] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.105440] ? __release_sock+0x360/0x360 [ 29.109559] ? lock_sock_nested+0x91/0x110 [ 29.113775] rds_conn_create_outgoing+0x3f/0x50 [ 29.118421] rds_sendmsg+0xda3/0x2390 [ 29.122198] ? avc_has_perm+0x43e/0x680 [ 29.126159] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.130628] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.135102] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.140107] ? find_held_lock+0x35/0x1d0 [ 29.144150] ? sock_has_perm+0x2a4/0x420 [ 29.148188] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.153523] ? lock_release+0xa02/0xa40 [ 29.157474] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.163332] ? __check_object_size+0x8b/0x530 [ 29.167806] ? __might_sleep+0x95/0x190 [ 29.171757] ? selinux_socket_sendmsg+0x36/0x40 [ 29.176405] ? security_socket_sendmsg+0x89/0xb0 [ 29.181144] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.185618] sock_sendmsg+0xca/0x110 [ 29.189307] SYSC_sendto+0x361/0x5c0 [ 29.192995] ? SYSC_connect+0x4a0/0x4a0 [ 29.196950] ? find_held_lock+0x35/0x1d0 [ 29.200995] ? lock_downgrade+0x980/0x980 [ 29.205142] ? up_read+0x1a/0x40 [ 29.208484] ? __do_page_fault+0x3d6/0xc90 [ 29.212701] SyS_sendto+0x40/0x50 [ 29.216129] ? SyS_getpeername+0x30/0x30 [ 29.220165] do_fast_syscall_32+0x3ee/0xfa1 [ 29.224469] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.229031] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.233770] ? syscall_return_slowpath+0x550/0x550 [ 29.238679] ? syscall_return_slowpath+0x2ac/0x550 [ 29.243586] ? prepare_exit_to_usermode+0x350/0x350 [ 29.248579] ? retint_user+0x18/0x18 [ 29.252274] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.257100] entry_SYSENTER_compat+0x54/0x63 [ 29.261491] RIP: 0023:0xf7fe6c79 [ 29.264825] RSP: 002b:00000000ffe98ecc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 29.272505] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 29.279747] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020b2d000 [ 29.286998] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 29.294244] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 29.301499] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 29.309138] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.316606] in_atomic(): 1, irqs_disabled(): 0, pid: 4152, name: syzkaller464825 [ 29.324150] 1 lock held by syzkaller464825/4152: [ 29.328906] #0: (rcu_read_lock){....}, at: [<000000005fe1eb2b>] __rds_conn_create+0xe46/0x1b50 [ 29.337880] CPU: 0 PID: 4152 Comm: syzkaller464825 Not tainted 4.15.0+ #217 [ 29.344960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.354286] Call Trace: [ 29.356854] dump_stack+0x194/0x257 [ 29.360461] ? arch_local_irq_restore+0x53/0x53 [ 29.365108] ? print_lock+0x9f/0xa2 [ 29.368711] ? lockdep_print_held_locks+0xc4/0x130 [ 29.373630] ___might_sleep+0x2b2/0x470 [ 29.377593] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.383451] ? __debug_object_init+0x235/0x1040 [ 29.388102] ? debug_mutex_init+0x1c/0x60 [ 29.392230] __might_sleep+0x95/0x190 [ 29.396015] kmem_cache_alloc_trace+0x299/0x740 [ 29.400669] ? lock_acquire+0x1d5/0x580 [ 29.404618] ? lock_acquire+0x1d5/0x580 [ 29.408567] ? __rds_conn_create+0xe46/0x1b50 [ 29.413040] rds_loop_conn_alloc+0xc8/0x380 [ 29.417337] ? rds_loop_conn_free+0x290/0x290 [ 29.421806] ? __init_waitqueue_head+0x97/0x140 [ 29.426456] ? rcutorture_record_progress+0x10/0x10 [ 29.431459] ? __lockdep_init_map+0xe4/0x650 [ 29.435847] __rds_conn_create+0x112f/0x1b50 [ 29.440248] ? rds_conn_drop+0xb0/0xb0 [ 29.444119] ? __raw_spin_lock_init+0x1c/0x100 [ 29.448688] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.453686] ? __lockdep_init_map+0xe4/0x650 [ 29.458069] ? lockdep_init_map+0x9/0x10 [ 29.462106] ? __init_waitqueue_head+0x97/0x140 [ 29.466749] ? init_wait_entry+0x1b0/0x1b0 [ 29.470961] ? lockdep_init_map+0x9/0x10 [ 29.474997] ? rds_message_alloc+0x28c/0x330 [ 29.479382] ? rds_message_next_extension+0x210/0x210 [ 29.484545] ? trace_hardirqs_on+0xd/0x10 [ 29.488672] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.493059] ? __release_sock+0x360/0x360 [ 29.497177] ? lock_sock_nested+0x91/0x110 [ 29.501390] rds_conn_create_outgoing+0x3f/0x50 [ 29.506037] rds_sendmsg+0xda3/0x2390 [ 29.509813] ? avc_has_perm+0x43e/0x680 [ 29.513774] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.518245] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.522718] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.527712] ? find_held_lock+0x35/0x1d0 [ 29.531754] ? sock_has_perm+0x2a4/0x420 [ 29.535793] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.541129] ? lock_release+0xa02/0xa40 [ 29.545076] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.550935] ? __check_object_size+0x8b/0x530 [ 29.555411] ? __might_sleep+0x95/0x190 [ 29.559374] ? selinux_socket_sendmsg+0x36/0x40 [ 29.564024] ? security_socket_sendmsg+0x89/0xb0 [ 29.568765] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.573235] sock_sendmsg+0xca/0x110 [ 29.576924] SYSC_sendto+0x361/0x5c0 [ 29.580615] ? SYSC_connect+0x4a0/0x4a0 [ 29.584569] ? find_held_lock+0x35/0x1d0 [ 29.588615] ? lock_downgrade+0x980/0x980 [ 29.592757] ? up_read+0x1a/0x40 [ 29.596101] ? __do_page_fault+0x3d6/0xc90 [ 29.600317] SyS_sendto+0x40/0x50 [ 29.603745] ? SyS_getpeername+0x30/0x30 [ 29.607782] do_fast_syscall_32+0x3ee/0xfa1 [ 29.612090] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.616649] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.621380] ? syscall_return_slowpath+0x550/0x550 [ 29.626282] ? syscall_return_slowpath+0x2ac/0x550 [ 29.631188] ? prepare_exit_to_usermode+0x350/0x350 [ 29.636184] ? retint_user+0x18/0x18 [ 29.639900] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.644727] entry_SYSENTER_compat+0x54/0x63 [ 29.649109] RIP: 0023:0xf7fe6c79 [ 29.652447] RSP: 002b:00000000ffe98ecc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 29.660142] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 29.667384] RDX: 000000000000