[....] Starting enhanced syslogd: rsyslogd[ 15.107500] audit: type=1400 audit(1518391389.648:5): avc: denied { syslog } for pid=3972 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: [ 18.000409] audit: type=1400 audit(1518391392.541:6): avc: denied { map } for pid=4110 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 '10.128.0.58' (ECDSA) to the list of known hosts. executing program [ 24.242732] audit: type=1400 audit(1518391398.783:7): avc: denied { map } for pid=4124 comm="syzkaller409624" path="/root/syzkaller409624916" 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 [ 24.268815] [ 24.270658] ============================= [ 24.274814] WARNING: suspicious RCU usage [ 24.278967] 4.15.0+ #308 Not tainted [ 24.282684] ----------------------------- [ 24.286838] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.296136] [ 24.296136] other info that might help us debug this: [ 24.296136] [ 24.304279] [ 24.304279] rcu_scheduler_active = 2, debug_locks = 1 [ 24.310950] 1 lock held by syzkaller409624/4124: [ 24.315703] #0: (rcu_read_lock){....}, at: [<0000000063542d4b>] __rds_conn_create+0xe46/0x1b50 [ 24.324647] [ 24.324647] stack backtrace: [ 24.329153] CPU: 1 PID: 4124 Comm: syzkaller409624 Not tainted 4.15.0+ #308 [ 24.336228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.345553] Call Trace: [ 24.348114] dump_stack+0x194/0x257 [ 24.351717] ? arch_local_irq_restore+0x53/0x53 [ 24.356369] lockdep_rcu_suspicious+0x123/0x170 [ 24.361014] ___might_sleep+0x385/0x470 [ 24.364961] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.370818] ? __debug_object_init+0x235/0x1040 [ 24.375461] ? debug_mutex_init+0x1c/0x60 [ 24.379587] __might_sleep+0x95/0x190 [ 24.383367] kmem_cache_alloc_trace+0x299/0x740 [ 24.388016] ? lock_acquire+0x1d5/0x580 [ 24.391969] ? lock_acquire+0x1d5/0x580 [ 24.395919] ? __rds_conn_create+0xe46/0x1b50 [ 24.400401] rds_loop_conn_alloc+0xc8/0x380 [ 24.404706] ? rds_loop_conn_free+0x290/0x290 [ 24.409180] ? __init_waitqueue_head+0x97/0x140 [ 24.413824] ? rcutorture_record_progress+0x10/0x10 [ 24.418813] ? __lockdep_init_map+0xe4/0x650 [ 24.423199] __rds_conn_create+0x112f/0x1b50 [ 24.427597] ? rds_conn_drop+0xb0/0xb0 [ 24.431465] ? __raw_spin_lock_init+0x1c/0x100 [ 24.436032] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.441035] ? __lockdep_init_map+0xe4/0x650 [ 24.445417] ? lockdep_init_map+0x9/0x10 [ 24.449449] ? __init_waitqueue_head+0x97/0x140 [ 24.454092] ? init_wait_entry+0x1b0/0x1b0 [ 24.458304] ? lockdep_init_map+0x9/0x10 [ 24.462342] ? rds_message_alloc+0x28c/0x330 [ 24.467220] ? rds_message_next_extension+0x210/0x210 [ 24.472381] ? trace_hardirqs_on+0xd/0x10 [ 24.476508] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.480895] ? __release_sock+0x360/0x360 [ 24.485012] ? lock_sock_nested+0x91/0x110 [ 24.489233] rds_conn_create_outgoing+0x3f/0x50 [ 24.493876] rds_sendmsg+0xda3/0x2390 [ 24.497648] ? avc_has_perm+0x43e/0x680 [ 24.501609] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.506076] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.510547] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.515537] ? find_held_lock+0x35/0x1d0 [ 24.519578] ? sock_has_perm+0x2a4/0x420 [ 24.523612] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.528955] ? lock_release+0xa22/0xa40 [ 24.532904] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.538764] ? __check_object_size+0x8b/0x530 [ 24.543238] ? __might_sleep+0x95/0x190 [ 24.547189] ? selinux_socket_sendmsg+0x36/0x40 [ 24.551831] ? security_socket_sendmsg+0x89/0xb0 [ 24.556561] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.561031] sock_sendmsg+0xca/0x110 [ 24.564721] SYSC_sendto+0x361/0x5c0 [ 24.568409] ? SYSC_connect+0x4a0/0x4a0 [ 24.572367] ? schedule+0xf5/0x430 [ 24.575878] ? SYSC_bind+0x290/0x410 [ 24.579582] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.584227] ? trace_hardirqs_off+0xd/0x10 [ 24.588438] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.593167] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.598681] SyS_sendto+0x40/0x50 [ 24.602118] ? SyS_getpeername+0x30/0x30 [ 24.606154] do_syscall_64+0x282/0x940 [ 24.610018] ? __do_page_fault+0xc90/0xc90 [ 24.614226] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.618957] ? syscall_return_slowpath+0x550/0x550 [ 24.623864] ? syscall_return_slowpath+0x2ac/0x550 [ 24.628768] ? prepare_exit_to_usermode+0x350/0x350 [ 24.633759] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 24.639100] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.643921] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.649080] RIP: 0033:0x43fd99 [ 24.652243] RSP: 002b:00007ffd25154828 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.659925] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.667168] RDX: 0000000000000000 RSI: 0000000020007000 RDI: 0000000000000003 [ 24.674408] RBP: 00000000006ca018 R08: 0000000020000000 R09: 0000000000000010 [ 24.681650] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.688893] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 24.696190] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.703642] in_atomic(): 1, irqs_disabled(): 0, pid: 4124, name: syzkaller409624 [ 24.711183] 1 lock held by syzkaller409624/4124: [ 24.715940] #0: (rcu_read_lock){....}, at: [<0000000063542d4b>] __rds_conn_create+0xe46/0x1b50 [ 24.724893] CPU: 1 PID: 4124 Comm: syzkaller409624 Not tainted 4.15.0+ #308 [ 24.731970] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.741294] Call Trace: [ 24.743856] dump_stack+0x194/0x257 [ 24.747457] ? arch_local_irq_restore+0x53/0x53 [ 24.752098] ? print_lock+0x9f/0xa2 [ 24.755695] ? lockdep_print_held_locks+0xc4/0x130 [ 24.760603] ___might_sleep+0x2b2/0x470 [ 24.764548] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.770402] ? __debug_object_init+0x235/0x1040 [ 24.775044] ? debug_mutex_init+0x1c/0x60 [ 24.779166] __might_sleep+0x95/0x190 [ 24.782946] kmem_cache_alloc_trace+0x299/0x740 [ 24.787597] ? lock_acquire+0x1d5/0x580 [ 24.791543] ? lock_acquire+0x1d5/0x580 [ 24.795495] ? __rds_conn_create+0xe46/0x1b50 [ 24.799965] rds_loop_conn_alloc+0xc8/0x380 [ 24.804258] ? rds_loop_conn_free+0x290/0x290 [ 24.808726] ? __init_waitqueue_head+0x97/0x140 [ 24.813372] ? rcutorture_record_progress+0x10/0x10 [ 24.818360] ? __lockdep_init_map+0xe4/0x650 [ 24.822743] __rds_conn_create+0x112f/0x1b50 [ 24.827142] ? rds_conn_drop+0xb0/0xb0 [ 24.831016] ? __raw_spin_lock_init+0x1c/0x100 [ 24.835580] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.840572] ? __lockdep_init_map+0xe4/0x650 [ 24.844953] ? lockdep_init_map+0x9/0x10 [ 24.848986] ? __init_waitqueue_head+0x97/0x140 [ 24.853628] ? init_wait_entry+0x1b0/0x1b0 [ 24.857839] ? lockdep_init_map+0x9/0x10 [ 24.861876] ? rds_message_alloc+0x28c/0x330 [ 24.866257] ? rds_message_next_extension+0x210/0x210 [ 24.871415] ? trace_hardirqs_on+0xd/0x10 [ 24.875540] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.879927] ? __release_sock+0x360/0x360 [ 24.884045] ? lock_sock_nested+0x91/0x110 [ 24.888258] rds_conn_create_outgoing+0x3f/0x50 [ 24.892910] rds_sendmsg+0xda3/0x2390 [ 24.896683] ? avc_has_perm+0x43e/0x680 [ 24.900642] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.905112] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.909582] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.914576] ? find_held_lock+0x35/0x1d0 [ 24.918618] ? sock_has_perm+0x2a4/0x420 [ 24.922652] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.927986] ? lock_release+0xa22/0xa40 [ 24.931932] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.937788] ? __check_object_size+0x8b/0x530 [ 24.942262] ? __might_sleep+0x95/0x190 [ 24.946213] ? selinux_socket_sendmsg+0x36/0x40 [ 24.950853] ? security_socket_sendmsg+0x89/0xb0 [ 24.955583] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.960053] sock_sendmsg+0xca/0x110 [ 24.963742] SYSC_sendto+0x361/0x5c0 [ 24.967430] ? SYSC_connect+0x4a0/0x4a0 [ 24.971388] ? schedule+0xf5/0x430 [ 24.974899] ? SYSC_bind+0x290/0x410 [ 24.978604] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.983250] ? trace_hardirqs_off+0xd/0x10 [ 24.987456] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.992188] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.997699] SyS_sendto+0x40/0x50 [ 25.001123] ? SyS_getpeername+0x30/0x30 [ 25.005160] do_syscall_64+0x282/0x940 [ 25.009027] ? __do_page_fault+0xc90/0xc90 [ 25.013237] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.017972] ? syscall_return_slowpath+0x550/0x550 [ 25.022872] ? syscall_return_slowpath+0x2ac/0x550 [ 25.027773] ? prepare_exit_to_usermode+0x350/0x350 [ 25.032764] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 25.038103] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.042925] entry_SYSCALL_64_afte