[....] Starting enhanced syslogd: rsyslogd[ 15.968191] audit: type=1400 audit(1518421246.365:5): avc: denied { syslog } for pid=4019 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: [ 18.417465] audit: type=1400 audit(1518421248.815:6): avc: denied { map } for pid=4157 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 '10.128.0.52' (ECDSA) to the list of known hosts. executing program [ 24.678060] audit: type=1400 audit(1518421255.075:7): avc: denied { map } for pid=4171 comm="syzkaller308208" path="/root/syzkaller308208113" 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 [ 24.704822] [ 24.706615] ============================= [ 24.710763] WARNING: suspicious RCU usage [ 24.714908] 4.15.0+ #222 Not tainted [ 24.718619] ----------------------------- [ 24.722777] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.732052] [ 24.732052] other info that might help us debug this: [ 24.732052] [ 24.740190] [ 24.740190] rcu_scheduler_active = 2, debug_locks = 1 [ 24.746850] 1 lock held by syzkaller308208/4171: [ 24.751596] #0: (rcu_read_lock){....}, at: [<00000000cba55d14>] __rds_conn_create+0xe46/0x1b50 [ 24.760531] [ 24.760531] stack backtrace: [ 24.765034] CPU: 0 PID: 4171 Comm: syzkaller308208 Not tainted 4.15.0+ #222 [ 24.772106] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.781430] Call Trace: [ 24.783992] dump_stack+0x194/0x257 [ 24.787600] ? arch_local_irq_restore+0x53/0x53 [ 24.792253] lockdep_rcu_suspicious+0x123/0x170 [ 24.796898] ___might_sleep+0x385/0x470 [ 24.800843] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.806695] ? __debug_object_init+0x235/0x1040 [ 24.811338] ? debug_mutex_init+0x1c/0x60 [ 24.815462] __might_sleep+0x95/0x190 [ 24.819241] kmem_cache_alloc_trace+0x299/0x740 [ 24.823881] ? lock_acquire+0x1d5/0x580 [ 24.827827] ? lock_acquire+0x1d5/0x580 [ 24.831774] ? __rds_conn_create+0xe46/0x1b50 [ 24.836246] rds_loop_conn_alloc+0xc8/0x380 [ 24.840539] ? rds_loop_conn_free+0x290/0x290 [ 24.845018] ? __init_waitqueue_head+0x97/0x140 [ 24.849671] ? rcutorture_record_progress+0x10/0x10 [ 24.854663] ? __lockdep_init_map+0xe4/0x650 [ 24.859051] __rds_conn_create+0x112f/0x1b50 [ 24.863450] ? rds_conn_drop+0xb0/0xb0 [ 24.867317] ? __raw_spin_lock_init+0x1c/0x100 [ 24.871874] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.876869] ? __lockdep_init_map+0xe4/0x650 [ 24.881255] ? lockdep_init_map+0x9/0x10 [ 24.885288] ? __init_waitqueue_head+0x97/0x140 [ 24.889928] ? init_wait_entry+0x1b0/0x1b0 [ 24.894139] ? lockdep_init_map+0x9/0x10 [ 24.898175] ? rds_message_alloc+0x28c/0x330 [ 24.902557] ? rds_message_next_extension+0x210/0x210 [ 24.907716] ? trace_hardirqs_on+0xd/0x10 [ 24.911843] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.916227] ? __release_sock+0x360/0x360 [ 24.920518] ? lock_sock_nested+0x91/0x110 [ 24.924729] rds_conn_create_outgoing+0x3f/0x50 [ 24.929371] rds_sendmsg+0xda3/0x2390 [ 24.933147] ? avc_has_perm+0x43e/0x680 [ 24.937109] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.941579] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.946051] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.951046] ? find_held_lock+0x35/0x1d0 [ 24.955092] ? sock_has_perm+0x2a4/0x420 [ 24.959126] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.964458] ? lock_release+0xa02/0xa40 [ 24.968403] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.974268] ? __check_object_size+0x8b/0x530 [ 24.978735] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.983207] ? __might_sleep+0x95/0x190 [ 24.987156] ? selinux_socket_sendmsg+0x36/0x40 [ 24.991797] ? security_socket_sendmsg+0x89/0xb0 [ 24.996527] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.000998] sock_sendmsg+0xca/0x110 [ 25.004692] SYSC_sendto+0x361/0x5c0 [ 25.008382] ? SYSC_connect+0x4a0/0x4a0 [ 25.012334] ? __do_page_fault+0x5f7/0xc90 [ 25.016541] ? lock_downgrade+0x980/0x980 [ 25.020666] ? handle_mm_fault+0x43b/0x970 [ 25.024884] ? up_read+0x1a/0x40 [ 25.028223] ? __do_page_fault+0x3d6/0xc90 [ 25.032435] ? mm_fault_error+0x2c0/0x2c0 [ 25.036555] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.042072] SyS_sendto+0x40/0x50 [ 25.045498] ? SyS_getpeername+0x30/0x30 [ 25.049531] do_syscall_64+0x282/0x940 [ 25.053390] ? __do_page_fault+0xc90/0xc90 [ 25.057597] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.062325] ? syscall_return_slowpath+0x550/0x550 [ 25.067229] ? syscall_return_slowpath+0x2ac/0x550 [ 25.072130] ? prepare_exit_to_usermode+0x350/0x350 [ 25.077120] ? retint_user+0x18/0x18 [ 25.080811] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.085635] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.090801] RIP: 0033:0x43fd99 [ 25.093964] RSP: 002b:00007ffd19bfa4d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.101646] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.108889] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 25.116131] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 25.123372] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.130611] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.137905] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.145347] in_atomic(): 1, irqs_disabled(): 0, pid: 4171, name: syzkaller308208 [ 25.152877] 1 lock held by syzkaller308208/4171: [ 25.157625] #0: (rcu_read_lock){....}, at: [<00000000cba55d14>] __rds_conn_create+0xe46/0x1b50 [ 25.166567] CPU: 0 PID: 4171 Comm: syzkaller308208 Not tainted 4.15.0+ #222 [ 25.173645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.182972] Call Trace: [ 25.185534] dump_stack+0x194/0x257 [ 25.189135] ? arch_local_irq_restore+0x53/0x53 [ 25.193776] ? print_lock+0x9f/0xa2 [ 25.197375] ? lockdep_print_held_locks+0xc4/0x130 [ 25.202280] ___might_sleep+0x2b2/0x470 [ 25.206227] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.212084] ? __debug_object_init+0x235/0x1040 [ 25.216725] ? debug_mutex_init+0x1c/0x60 [ 25.220849] __might_sleep+0x95/0x190 [ 25.224627] kmem_cache_alloc_trace+0x299/0x740 [ 25.229272] ? lock_acquire+0x1d5/0x580 [ 25.233217] ? lock_acquire+0x1d5/0x580 [ 25.237169] ? __rds_conn_create+0xe46/0x1b50 [ 25.241650] rds_loop_conn_alloc+0xc8/0x380 [ 25.245957] ? rds_loop_conn_free+0x290/0x290 [ 25.250427] ? __init_waitqueue_head+0x97/0x140 [ 25.255070] ? rcutorture_record_progress+0x10/0x10 [ 25.260061] ? __lockdep_init_map+0xe4/0x650 [ 25.264445] __rds_conn_create+0x112f/0x1b50 [ 25.268843] ? rds_conn_drop+0xb0/0xb0 [ 25.272710] ? __raw_spin_lock_init+0x1c/0x100 [ 25.277265] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.282256] ? __lockdep_init_map+0xe4/0x650 [ 25.286637] ? lockdep_init_map+0x9/0x10 [ 25.290670] ? __init_waitqueue_head+0x97/0x140 [ 25.295309] ? init_wait_entry+0x1b0/0x1b0 [ 25.299523] ? lockdep_init_map+0x9/0x10 [ 25.303556] ? rds_message_alloc+0x28c/0x330 [ 25.307937] ? rds_message_next_extension+0x210/0x210 [ 25.313102] ? trace_hardirqs_on+0xd/0x10 [ 25.317227] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.321613] ? __release_sock+0x360/0x360 [ 25.325729] ? lock_sock_nested+0x91/0x110 [ 25.329940] rds_conn_create_outgoing+0x3f/0x50 [ 25.334588] rds_sendmsg+0xda3/0x2390 [ 25.338359] ? avc_has_perm+0x43e/0x680 [ 25.342319] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.346786] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.351262] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.356259] ? find_held_lock+0x35/0x1d0 [ 25.360301] ? sock_has_perm+0x2a4/0x420 [ 25.364335] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.369667] ? lock_release+0xa02/0xa40 [ 25.373614] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.379470] ? __check_object_size+0x8b/0x530 [ 25.383942] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.388414] ? __might_sleep+0x95/0x190 [ 25.392365] ? selinux_socket_sendmsg+0x36/0x40 [ 25.397012] ? security_socket_sendmsg+0x89/0xb0 [ 25.401747] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.406218] sock_sendmsg+0xca/0x110 [ 25.409905] SYSC_sendto+0x361/0x5c0 [ 25.413596] ? SYSC_connect+0x4a0/0x4a0 [ 25.417634] ? __do_page_fault+0x5f7/0xc90 [ 25.421843] ? lock_downgrade+0x980/0x980 [ 25.425974] ? handle_mm_fault+0x43b/0x970 [ 25.430195] ? up_read+0x1a/0x40 [ 25.433532] ? __do_page_fault+0x3d6/0xc90 [ 25.437746] ? mm_fault_error+0x2c0/0x2c0 [ 25.441866] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.447383] SyS_sendto+0x40/0x50 [ 25.450811] ? SyS_getpeername+0x30/0x30 [ 25.454846] do_syscall_64+0x282/0x940 [ 25.458703] ? __do_page_fault+0xc90/0xc90 [ 25.462910] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.467638] ? syscall_return_slowpath+0x550/0x550 [ 25.472541] ? syscall_return_slowpath+0x2ac/0x550 [ 25.477443] ? prepare_exit_to_usermode+0x350/0x350 [ 25.482433] ? retint_user+0x18/0x18 [ 25.486123] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.490953] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.496112] RIP: 0033:0x43fd99 [ 25.499273] RSP: 002b:00007ffd19bfa4d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.506950] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.514190] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 25.521432] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 25.528685] R10: 0000000000000000 R