[....] Starting enhanced syslogd: rsyslogd[ 16.200913] audit: type=1400 audit(1518435899.070:5): avc: denied { syslog } for pid=4003 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 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.133899] audit: type=1400 audit(1518435905.003:6): avc: denied { map } for pid=4143 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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program [ 28.635741] audit: type=1400 audit(1518435911.505:7): avc: denied { map } for pid=4158 comm="syzkaller148276" path="/root/syzkaller148276345" 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 [ 28.662535] [ 28.664219] ============================= [ 28.668768] WARNING: suspicious RCU usage [ 28.672914] 4.15.0+ #222 Not tainted [ 28.676623] ----------------------------- [ 28.680774] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.690040] [ 28.690040] other info that might help us debug this: [ 28.690040] [ 28.698385] [ 28.698385] rcu_scheduler_active = 2, debug_locks = 1 [ 28.705051] 1 lock held by syzkaller148276/4158: [ 28.709810] #0: (rcu_read_lock){....}, at: [<000000005b97de68>] __rds_conn_create+0xe46/0x1b50 [ 28.718762] [ 28.718762] stack backtrace: [ 28.723263] CPU: 1 PID: 4158 Comm: syzkaller148276 Not tainted 4.15.0+ #222 [ 28.730337] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.739670] Call Trace: [ 28.742233] dump_stack+0x194/0x257 [ 28.745836] ? arch_local_irq_restore+0x53/0x53 [ 28.750501] lockdep_rcu_suspicious+0x123/0x170 [ 28.755144] ___might_sleep+0x385/0x470 [ 28.759094] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.764950] ? __debug_object_init+0x235/0x1040 [ 28.769591] ? lock_acquire+0x1d5/0x580 [ 28.773539] ? debug_mutex_init+0x1c/0x60 [ 28.777664] __might_sleep+0x95/0x190 [ 28.781443] kmem_cache_alloc_trace+0x299/0x740 [ 28.786097] ? lock_acquire+0x1d5/0x580 [ 28.790051] ? lock_acquire+0x1d5/0x580 [ 28.794016] ? __rds_conn_create+0xe46/0x1b50 [ 28.798498] rds_loop_conn_alloc+0xc8/0x380 [ 28.802811] ? rds_loop_conn_free+0x290/0x290 [ 28.807285] ? __init_waitqueue_head+0x97/0x140 [ 28.811945] ? rcutorture_record_progress+0x10/0x10 [ 28.816935] ? __lockdep_init_map+0xe4/0x650 [ 28.821324] __rds_conn_create+0x112f/0x1b50 [ 28.825729] ? rds_conn_drop+0xb0/0xb0 [ 28.829599] ? __raw_spin_lock_init+0x1c/0x100 [ 28.834157] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.839174] ? __lockdep_init_map+0xe4/0x650 [ 28.843560] ? lockdep_init_map+0x9/0x10 [ 28.847596] ? __init_waitqueue_head+0x97/0x140 [ 28.852243] ? init_wait_entry+0x1b0/0x1b0 [ 28.856457] ? lockdep_init_map+0x9/0x10 [ 28.860494] ? rds_message_alloc+0x28c/0x330 [ 28.864876] ? rds_message_next_extension+0x210/0x210 [ 28.870047] ? trace_hardirqs_on+0xd/0x10 [ 28.874174] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.878561] ? __release_sock+0x360/0x360 [ 28.882691] ? lock_sock_nested+0x91/0x110 [ 28.886905] rds_conn_create_outgoing+0x3f/0x50 [ 28.891552] rds_sendmsg+0xda3/0x2390 [ 28.895326] ? avc_has_perm+0x43e/0x680 [ 28.899285] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.903753] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.908234] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.913237] ? find_held_lock+0x35/0x1d0 [ 28.917280] ? sock_has_perm+0x2a4/0x420 [ 28.921326] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.926666] ? lock_release+0xa02/0xa40 [ 28.930614] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.936474] ? __check_object_size+0x8b/0x530 [ 28.940943] ? __handle_mm_fault+0x80e/0x3ce0 [ 28.945417] ? __might_sleep+0x95/0x190 [ 28.949370] ? selinux_socket_sendmsg+0x36/0x40 [ 28.954013] ? security_socket_sendmsg+0x89/0xb0 [ 28.958742] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.963213] sock_sendmsg+0xca/0x110 [ 28.966902] SYSC_sendto+0x361/0x5c0 [ 28.970593] ? SYSC_connect+0x4a0/0x4a0 [ 28.974547] ? __do_page_fault+0x5f7/0xc90 [ 28.978758] ? lock_downgrade+0x980/0x980 [ 28.982888] ? handle_mm_fault+0x43b/0x970 [ 28.987110] ? up_read+0x1a/0x40 [ 28.990452] ? __do_page_fault+0x3d6/0xc90 [ 28.994666] ? mm_fault_error+0x2c0/0x2c0 [ 28.998805] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.004320] SyS_sendto+0x40/0x50 [ 29.007748] ? SyS_getpeername+0x30/0x30 [ 29.011784] do_syscall_64+0x282/0x940 [ 29.015643] ? __do_page_fault+0xc90/0xc90 [ 29.019849] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.024583] ? syscall_return_slowpath+0x550/0x550 [ 29.029487] ? syscall_return_slowpath+0x2ac/0x550 [ 29.034392] ? prepare_exit_to_usermode+0x350/0x350 [ 29.039387] ? retint_user+0x18/0x18 [ 29.043079] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.047902] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.053077] RIP: 0033:0x43fdb9 [ 29.056239] RSP: 002b:00007ffc0ac42ff8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.063919] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 29.071165] RDX: 0000000000000000 RSI: 0000000020141fb9 RDI: 0000000000000003 [ 29.078407] RBP: 00000000006ca018 R08: 000000002069affb R09: 0000000000000010 [ 29.085650] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016e0 [ 29.092893] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 29.100207] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.107647] in_atomic(): 1, irqs_disabled(): 0, pid: 4158, name: syzkaller148276 [ 29.115201] 1 lock held by syzkaller148276/4158: [ 29.119950] #0: (rcu_read_lock){....}, at: [<000000005b97de68>] __rds_conn_create+0xe46/0x1b50 [ 29.128896] CPU: 1 PID: 4158 Comm: syzkaller148276 Not tainted 4.15.0+ #222 [ 29.135972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.145298] Call Trace: [ 29.147873] dump_stack+0x194/0x257 [ 29.151478] ? arch_local_irq_restore+0x53/0x53 [ 29.156121] ? print_lock+0x9f/0xa2 [ 29.159723] ? lockdep_print_held_locks+0xc4/0x130 [ 29.164632] ___might_sleep+0x2b2/0x470 [ 29.168582] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.174439] ? __debug_object_init+0x235/0x1040 [ 29.179080] ? lock_acquire+0x1d5/0x580 [ 29.183028] ? debug_mutex_init+0x1c/0x60 [ 29.187155] __might_sleep+0x95/0x190 [ 29.190935] kmem_cache_alloc_trace+0x299/0x740 [ 29.195577] ? lock_acquire+0x1d5/0x580 [ 29.199522] ? lock_acquire+0x1d5/0x580 [ 29.203491] ? __rds_conn_create+0xe46/0x1b50 [ 29.207963] rds_loop_conn_alloc+0xc8/0x380 [ 29.212271] ? rds_loop_conn_free+0x290/0x290 [ 29.216741] ? __init_waitqueue_head+0x97/0x140 [ 29.221385] ? rcutorture_record_progress+0x10/0x10 [ 29.226376] ? __lockdep_init_map+0xe4/0x650 [ 29.230763] __rds_conn_create+0x112f/0x1b50 [ 29.235166] ? rds_conn_drop+0xb0/0xb0 [ 29.239036] ? __raw_spin_lock_init+0x1c/0x100 [ 29.243593] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.248589] ? __lockdep_init_map+0xe4/0x650 [ 29.252973] ? lockdep_init_map+0x9/0x10 [ 29.257008] ? __init_waitqueue_head+0x97/0x140 [ 29.261652] ? init_wait_entry+0x1b0/0x1b0 [ 29.265865] ? lockdep_init_map+0x9/0x10 [ 29.269900] ? rds_message_alloc+0x28c/0x330 [ 29.274291] ? rds_message_next_extension+0x210/0x210 [ 29.279462] ? trace_hardirqs_on+0xd/0x10 [ 29.283590] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.287975] ? __release_sock+0x360/0x360 [ 29.292093] ? lock_sock_nested+0x91/0x110 [ 29.296305] rds_conn_create_outgoing+0x3f/0x50 [ 29.300949] rds_sendmsg+0xda3/0x2390 [ 29.304724] ? avc_has_perm+0x43e/0x680 [ 29.308685] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.313155] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.317625] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.322618] ? find_held_lock+0x35/0x1d0 [ 29.326663] ? sock_has_perm+0x2a4/0x420 [ 29.330701] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.336035] ? lock_release+0xa02/0xa40 [ 29.339985] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.345845] ? __check_object_size+0x8b/0x530 [ 29.350312] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.354786] ? __might_sleep+0x95/0x190 [ 29.358737] ? selinux_socket_sendmsg+0x36/0x40 [ 29.363377] ? security_socket_sendmsg+0x89/0xb0 [ 29.368107] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.372583] sock_sendmsg+0xca/0x110 [ 29.376271] SYSC_sendto+0x361/0x5c0 [ 29.379962] ? SYSC_connect+0x4a0/0x4a0 [ 29.383917] ? __do_page_fault+0x5f7/0xc90 [ 29.388129] ? lock_downgrade+0x980/0x980 [ 29.392257] ? handle_mm_fault+0x43b/0x970 [ 29.396476] ? up_read+0x1a/0x40 [ 29.399836] ? __do_page_fault+0x3d6/0xc90 [ 29.404051] ? mm_fault_error+0x2c0/0x2c0 [ 29.408174] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.413702] SyS_sendto+0x40/0x50 [ 29.417134] ? SyS_getpeername+0x30/0x30 [ 29.421176] do_syscall_64+0x282/0x940 [ 29.425048] ? __do_page_fault+0xc90/0xc90 [ 29.429259] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.433989] ? syscall_return_slowpath+0x550/0x550 [ 29.438894] ? syscall_return_slowpath+0x2ac/0x550 [ 29.443798] ? prepare_exit_to_usermode+0x350/0x350 [ 29.448790] ? retint_user+0x18/0x18 [ 29.452482] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.457305] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.462467] RIP: 0033:0x43fdb9 [ 29.465627] RSP: 002b:00007ffc0ac42ff8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.473309] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 29.480551] RDX: 0000000000000000 RSI: 0000000020141fb9 RDI: 0000000000000003 [ 29.487803] RBP: