[....] Starting enhanced syslogd: rsyslogd[ 15.098772] audit: type=1400 audit(1518401865.632:5): avc: denied { syslog } for pid=4012 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: [ 20.131817] audit: type=1400 audit(1518401870.665:6): avc: denied { map } for pid=4152 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 '10.128.0.49' (ECDSA) to the list of known hosts. executing program [ 35.076034] audit: type=1400 audit(1518401885.609:7): avc: denied { map } for pid=4169 comm="syzkaller025413" path="/root/syzkaller025413502" 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 [ 35.102752] [ 35.104576] ============================= [ 35.108729] WARNING: suspicious RCU usage [ 35.112880] 4.15.0+ #222 Not tainted [ 35.116598] ----------------------------- [ 35.120746] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 35.130016] [ 35.130016] other info that might help us debug this: [ 35.130016] [ 35.138144] [ 35.138144] rcu_scheduler_active = 2, debug_locks = 1 [ 35.144807] 1 lock held by syzkaller025413/4169: [ 35.149548] #0: (rcu_read_lock){....}, at: [<000000000b9745f3>] __rds_conn_create+0xe46/0x1b50 [ 35.158492] [ 35.158492] stack backtrace: [ 35.162988] CPU: 1 PID: 4169 Comm: syzkaller025413 Not tainted 4.15.0+ #222 [ 35.170060] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.179387] Call Trace: [ 35.181949] dump_stack+0x194/0x257 [ 35.185552] ? arch_local_irq_restore+0x53/0x53 [ 35.190204] lockdep_rcu_suspicious+0x123/0x170 [ 35.194849] ___might_sleep+0x385/0x470 [ 35.198794] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 35.204649] ? __debug_object_init+0x235/0x1040 [ 35.209292] ? debug_mutex_init+0x1c/0x60 [ 35.213418] __might_sleep+0x95/0x190 [ 35.217198] kmem_cache_alloc_trace+0x299/0x740 [ 35.221840] ? lock_acquire+0x1d5/0x580 [ 35.225785] ? lock_acquire+0x1d5/0x580 [ 35.229731] ? __rds_conn_create+0xe46/0x1b50 [ 35.234201] rds_loop_conn_alloc+0xc8/0x380 [ 35.238499] ? rds_loop_conn_free+0x290/0x290 [ 35.242965] ? __init_waitqueue_head+0x97/0x140 [ 35.247610] ? rcutorture_record_progress+0x10/0x10 [ 35.252601] ? __lockdep_init_map+0xe4/0x650 [ 35.256988] __rds_conn_create+0x112f/0x1b50 [ 35.261387] ? rds_conn_drop+0xb0/0xb0 [ 35.265256] ? __raw_spin_lock_init+0x1c/0x100 [ 35.269813] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.274804] ? __lockdep_init_map+0xe4/0x650 [ 35.279188] ? lockdep_init_map+0x9/0x10 [ 35.283221] ? __init_waitqueue_head+0x97/0x140 [ 35.287863] ? init_wait_entry+0x1b0/0x1b0 [ 35.292073] ? lockdep_init_map+0x9/0x10 [ 35.296109] ? rds_message_alloc+0x28c/0x330 [ 35.300492] ? rds_message_next_extension+0x210/0x210 [ 35.305651] ? trace_hardirqs_on+0xd/0x10 [ 35.309775] ? _raw_spin_unlock_bh+0x30/0x40 [ 35.314160] ? __release_sock+0x360/0x360 [ 35.318279] ? lock_sock_nested+0x91/0x110 [ 35.322494] rds_conn_create_outgoing+0x3f/0x50 [ 35.327140] rds_sendmsg+0xda3/0x2390 [ 35.330913] ? avc_has_perm+0x43e/0x680 [ 35.334873] ? rds_send_drop_to+0x19d0/0x19d0 [ 35.339340] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.343811] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.348804] ? find_held_lock+0x35/0x1d0 [ 35.352847] ? sock_has_perm+0x2a4/0x420 [ 35.356881] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 35.362216] ? lock_release+0xa02/0xa40 [ 35.366161] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 35.372015] ? __check_object_size+0x8b/0x530 [ 35.376483] ? __handle_mm_fault+0x80e/0x3ce0 [ 35.380954] ? __might_sleep+0x95/0x190 [ 35.384902] ? selinux_socket_sendmsg+0x36/0x40 [ 35.389541] ? security_socket_sendmsg+0x89/0xb0 [ 35.394267] ? rds_send_drop_to+0x19d0/0x19d0 [ 35.398735] sock_sendmsg+0xca/0x110 [ 35.402421] SYSC_sendto+0x361/0x5c0 [ 35.406110] ? SYSC_connect+0x4a0/0x4a0 [ 35.410065] ? __do_page_fault+0x5f7/0xc90 [ 35.414272] ? lock_downgrade+0x980/0x980 [ 35.418396] ? handle_mm_fault+0x43b/0x970 [ 35.422614] ? up_read+0x1a/0x40 [ 35.425953] ? __do_page_fault+0x3d6/0xc90 [ 35.430167] ? mm_fault_error+0x2c0/0x2c0 [ 35.434288] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 35.439801] SyS_sendto+0x40/0x50 [ 35.443229] ? SyS_getpeername+0x30/0x30 [ 35.447261] do_syscall_64+0x282/0x940 [ 35.451120] ? __do_page_fault+0xc90/0xc90 [ 35.455329] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 35.460837] ? syscall_return_slowpath+0x550/0x550 [ 35.465737] ? syscall_return_slowpath+0x2ac/0x550 [ 35.470639] ? retint_user+0x18/0x18 [ 35.474328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.479149] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 35.484311] RIP: 0033:0x43fd99 [ 35.487474] RSP: 002b:00007ffe28406588 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 35.495165] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 35.502416] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000003 [ 35.509658] RBP: 00000000006ca018 R08: 000000002069affb R09: 0000000000000010 [ 35.516899] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 35.524138] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 35.531438] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 35.538876] in_atomic(): 1, irqs_disabled(): 0, pid: 4169, name: syzkaller025413 [ 35.546408] 1 lock held by syzkaller025413/4169: [ 35.551166] #0: (rcu_read_lock){....}, at: [<000000000b9745f3>] __rds_conn_create+0xe46/0x1b50 [ 35.560110] CPU: 1 PID: 4169 Comm: syzkaller025413 Not tainted 4.15.0+ #222 [ 35.567183] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.576508] Call Trace: [ 35.579068] dump_stack+0x194/0x257 [ 35.582672] ? arch_local_irq_restore+0x53/0x53 [ 35.587314] ? print_lock+0x9f/0xa2 [ 35.590913] ? lockdep_print_held_locks+0xc4/0x130 [ 35.595820] ___might_sleep+0x2b2/0x470 [ 35.599765] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 35.605621] ? __debug_object_init+0x235/0x1040 [ 35.610264] ? debug_mutex_init+0x1c/0x60 [ 35.614386] __might_sleep+0x95/0x190 [ 35.618165] kmem_cache_alloc_trace+0x299/0x740 [ 35.622809] ? lock_acquire+0x1d5/0x580 [ 35.626763] ? lock_acquire+0x1d5/0x580 [ 35.630708] ? __rds_conn_create+0xe46/0x1b50 [ 35.635180] rds_loop_conn_alloc+0xc8/0x380 [ 35.639474] ? rds_loop_conn_free+0x290/0x290 [ 35.643943] ? __init_waitqueue_head+0x97/0x140 [ 35.648586] ? rcutorture_record_progress+0x10/0x10 [ 35.653576] ? __lockdep_init_map+0xe4/0x650 [ 35.657959] __rds_conn_create+0x112f/0x1b50 [ 35.662358] ? rds_conn_drop+0xb0/0xb0 [ 35.666227] ? __raw_spin_lock_init+0x1c/0x100 [ 35.670782] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.675774] ? __lockdep_init_map+0xe4/0x650 [ 35.680155] ? lockdep_init_map+0x9/0x10 [ 35.684187] ? __init_waitqueue_head+0x97/0x140 [ 35.688829] ? init_wait_entry+0x1b0/0x1b0 [ 35.693040] ? lockdep_init_map+0x9/0x10 [ 35.697077] ? rds_message_alloc+0x28c/0x330 [ 35.701461] ? rds_message_next_extension+0x210/0x210 [ 35.706621] ? trace_hardirqs_on+0xd/0x10 [ 35.710741] ? _raw_spin_unlock_bh+0x30/0x40 [ 35.715126] ? __release_sock+0x360/0x360 [ 35.719244] ? lock_sock_nested+0x91/0x110 [ 35.723457] rds_conn_create_outgoing+0x3f/0x50 [ 35.728101] rds_sendmsg+0xda3/0x2390 [ 35.731873] ? avc_has_perm+0x43e/0x680 [ 35.735830] ? rds_send_drop_to+0x19d0/0x19d0 [ 35.740297] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.744775] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.749767] ? find_held_lock+0x35/0x1d0 [ 35.753810] ? sock_has_perm+0x2a4/0x420 [ 35.757845] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 35.763179] ? lock_release+0xa02/0xa40 [ 35.767125] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 35.772979] ? __check_object_size+0x8b/0x530 [ 35.777446] ? __handle_mm_fault+0x80e/0x3ce0 [ 35.781916] ? __might_sleep+0x95/0x190 [ 35.785866] ? selinux_socket_sendmsg+0x36/0x40 [ 35.790507] ? security_socket_sendmsg+0x89/0xb0 [ 35.795235] ? rds_send_drop_to+0x19d0/0x19d0 [ 35.799705] sock_sendmsg+0xca/0x110 [ 35.803392] SYSC_sendto+0x361/0x5c0 [ 35.807081] ? SYSC_connect+0x4a0/0x4a0 [ 35.811032] ? __do_page_fault+0x5f7/0xc90 [ 35.815238] ? lock_downgrade+0x980/0x980 [ 35.819365] ? handle_mm_fault+0x43b/0x970 [ 35.823584] ? up_read+0x1a/0x40 [ 35.826923] ? __do_page_fault+0x3d6/0xc90 [ 35.831137] ? mm_fault_error+0x2c0/0x2c0 [ 35.835258] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 35.840768] SyS_sendto+0x40/0x50 [ 35.844197] ? SyS_getpeername+0x30/0x30 [ 35.848228] do_syscall_64+0x282/0x940 [ 35.852086] ? __do_page_fault+0xc90/0xc90 [ 35.856291] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 35.861809] ? syscall_return_slowpath+0x550/0x550 [ 35.866709] ? syscall_return_slowpath+0x2ac/0x550 [ 35.871612] ? retint_user+0x18/0x18 [ 35.875306] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.880124] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 35.885282] RIP: 0033:0x43fd99 [ 35.888445] RSP: 002b:00007ffe28406588 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 35.896122] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 35.903363] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000003 [ 35.910603] RBP: 00000000006ca018 R08: 000000002069affb R09: 0000000000000010 [ 35.917843] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 35.926126] R13: 0000000000401750 R14: 000