[....] Starting enhanced syslogd: rsyslogd[ 15.403467] audit: type=1400 audit(1518398413.142:5): avc: denied { syslog } for pid=3886 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: [ 18.452201] audit: type=1400 audit(1518398416.190:6): avc: denied { map } for pid=4025 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program [ 24.779556] audit: type=1400 audit(1518398422.518:7): avc: denied { map } for pid=4039 comm="syzkaller684500" path="/root/syzkaller684500819" 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 [ 24.806684] [ 24.808411] ============================= [ 24.812581] WARNING: suspicious RCU usage [ 24.816738] 4.16.0-rc1+ #219 Not tainted [ 24.820806] ----------------------------- [ 24.824978] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.834249] [ 24.834249] other info that might help us debug this: [ 24.834249] [ 24.842398] [ 24.842398] rcu_scheduler_active = 2, debug_locks = 1 [ 24.849071] 1 lock held by syzkaller684500/4039: [ 24.853823] #0: (rcu_read_lock){....}, at: [<000000001c418799>] __rds_conn_create+0xe46/0x1b50 [ 24.862779] [ 24.862779] stack backtrace: [ 24.867289] CPU: 1 PID: 4039 Comm: syzkaller684500 Not tainted 4.16.0-rc1+ #219 [ 24.874711] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.884043] Call Trace: [ 24.886619] dump_stack+0x194/0x257 [ 24.890223] ? arch_local_irq_restore+0x53/0x53 [ 24.894879] lockdep_rcu_suspicious+0x123/0x170 [ 24.899524] ___might_sleep+0x385/0x470 [ 24.903472] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.909343] ? __debug_object_init+0x235/0x1040 [ 24.914001] ? debug_mutex_init+0x1c/0x60 [ 24.918138] __might_sleep+0x95/0x190 [ 24.921926] kmem_cache_alloc_trace+0x299/0x740 [ 24.926576] ? lock_acquire+0x1d5/0x580 [ 24.930521] ? lock_acquire+0x1d5/0x580 [ 24.934471] ? __rds_conn_create+0xe46/0x1b50 [ 24.938945] rds_loop_conn_alloc+0xc8/0x380 [ 24.943241] ? rds_loop_conn_free+0x290/0x290 [ 24.947712] ? __init_waitqueue_head+0x97/0x140 [ 24.952360] ? rcutorture_record_progress+0x10/0x10 [ 24.957350] ? __lockdep_init_map+0xe4/0x650 [ 24.961750] __rds_conn_create+0x112f/0x1b50 [ 24.966153] ? rds_conn_drop+0xb0/0xb0 [ 24.970030] ? __raw_spin_lock_init+0x1c/0x100 [ 24.974586] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.979581] ? __lockdep_init_map+0xe4/0x650 [ 24.983966] ? lockdep_init_map+0x9/0x10 [ 24.987998] ? __init_waitqueue_head+0x97/0x140 [ 24.992646] ? init_wait_entry+0x1b0/0x1b0 [ 24.996857] ? lockdep_init_map+0x9/0x10 [ 25.000895] ? rds_message_alloc+0x28c/0x330 [ 25.005280] ? rds_message_next_extension+0x210/0x210 [ 25.010441] ? trace_hardirqs_on+0xd/0x10 [ 25.014565] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.018952] ? __release_sock+0x360/0x360 [ 25.023071] ? lock_sock_nested+0x91/0x110 [ 25.027285] rds_conn_create_outgoing+0x3f/0x50 [ 25.031931] rds_sendmsg+0xda3/0x2390 [ 25.035713] ? avc_has_perm+0x43e/0x680 [ 25.039677] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.044150] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.048639] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.053663] ? find_held_lock+0x35/0x1d0 [ 25.057738] ? sock_has_perm+0x2a4/0x420 [ 25.061808] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.067170] ? lock_release+0xa22/0xa40 [ 25.071138] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.077012] ? __check_object_size+0x8b/0x530 [ 25.081507] ? __might_sleep+0x95/0x190 [ 25.085474] ? selinux_socket_sendmsg+0x36/0x40 [ 25.090120] ? security_socket_sendmsg+0x89/0xb0 [ 25.094857] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.099345] sock_sendmsg+0xca/0x110 [ 25.103046] SYSC_sendto+0x361/0x5c0 [ 25.106748] ? SYSC_connect+0x4a0/0x4a0 [ 25.110709] ? find_held_lock+0x35/0x1d0 [ 25.114761] ? lock_downgrade+0x980/0x980 [ 25.118913] ? up_read+0x1a/0x40 [ 25.122267] ? __do_page_fault+0x3d6/0xc90 [ 25.126495] SyS_sendto+0x40/0x50 [ 25.129930] ? SyS_getpeername+0x30/0x30 [ 25.133972] do_fast_syscall_32+0x3ee/0xfa1 [ 25.138289] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.142855] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.148379] ? syscall_return_slowpath+0x550/0x550 [ 25.153293] ? syscall_return_slowpath+0x2ac/0x550 [ 25.158202] ? retint_user+0x18/0x18 [ 25.161893] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.166717] entry_SYSENTER_compat+0x54/0x63 [ 25.171096] RIP: 0023:0xf7ff8c79 [ 25.174431] RSP: 002b:00000000ffe9023c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 25.182112] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 25.189370] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020b2d000 [ 25.196612] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 25.203855] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.211764] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.219103] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.226574] in_atomic(): 1, irqs_disabled(): 0, pid: 4039, name: syzkaller684500 [ 25.234139] 1 lock held by syzkaller684500/4039: [ 25.238902] #0: (rcu_read_lock){....}, at: [<000000001c418799>] __rds_conn_create+0xe46/0x1b50 [ 25.247887] CPU: 1 PID: 4039 Comm: syzkaller684500 Not tainted 4.16.0-rc1+ #219 [ 25.255320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.264662] Call Trace: [ 25.267235] dump_stack+0x194/0x257 [ 25.270841] ? arch_local_irq_restore+0x53/0x53 [ 25.275494] ? print_lock+0x9f/0xa2 [ 25.279096] ? lockdep_print_held_locks+0xc4/0x130 [ 25.284004] ___might_sleep+0x2b2/0x470 [ 25.287954] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.293811] ? __debug_object_init+0x235/0x1040 [ 25.298455] ? debug_mutex_init+0x1c/0x60 [ 25.302579] __might_sleep+0x95/0x190 [ 25.306361] kmem_cache_alloc_trace+0x299/0x740 [ 25.311007] ? lock_acquire+0x1d5/0x580 [ 25.314952] ? lock_acquire+0x1d5/0x580 [ 25.318899] ? __rds_conn_create+0xe46/0x1b50 [ 25.323372] rds_loop_conn_alloc+0xc8/0x380 [ 25.327666] ? rds_loop_conn_free+0x290/0x290 [ 25.332135] ? __init_waitqueue_head+0x97/0x140 [ 25.336782] ? rcutorture_record_progress+0x10/0x10 [ 25.341774] ? __lockdep_init_map+0xe4/0x650 [ 25.346162] __rds_conn_create+0x112f/0x1b50 [ 25.350570] ? rds_conn_drop+0xb0/0xb0 [ 25.354444] ? __raw_spin_lock_init+0x1c/0x100 [ 25.359001] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.363997] ? __lockdep_init_map+0xe4/0x650 [ 25.368381] ? lockdep_init_map+0x9/0x10 [ 25.372421] ? __init_waitqueue_head+0x97/0x140 [ 25.377064] ? init_wait_entry+0x1b0/0x1b0 [ 25.381278] ? lockdep_init_map+0x9/0x10 [ 25.385326] ? rds_message_alloc+0x28c/0x330 [ 25.389708] ? rds_message_next_extension+0x210/0x210 [ 25.394872] ? trace_hardirqs_on+0xd/0x10 [ 25.399000] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.403386] ? __release_sock+0x360/0x360 [ 25.407505] ? lock_sock_nested+0x91/0x110 [ 25.411716] rds_conn_create_outgoing+0x3f/0x50 [ 25.416360] rds_sendmsg+0xda3/0x2390 [ 25.420132] ? avc_has_perm+0x43e/0x680 [ 25.424093] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.428564] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.433033] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.438038] ? find_held_lock+0x35/0x1d0 [ 25.442101] ? sock_has_perm+0x2a4/0x420 [ 25.446147] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.451497] ? lock_release+0xa22/0xa40 [ 25.455454] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.461314] ? __check_object_size+0x8b/0x530 [ 25.465791] ? __might_sleep+0x95/0x190 [ 25.469752] ? selinux_socket_sendmsg+0x36/0x40 [ 25.474397] ? security_socket_sendmsg+0x89/0xb0 [ 25.479130] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.483602] sock_sendmsg+0xca/0x110 [ 25.487292] SYSC_sendto+0x361/0x5c0 [ 25.490983] ? SYSC_connect+0x4a0/0x4a0 [ 25.494935] ? find_held_lock+0x35/0x1d0 [ 25.498989] ? lock_downgrade+0x980/0x980 [ 25.503132] ? up_read+0x1a/0x40 [ 25.506474] ? __do_page_fault+0x3d6/0xc90 [ 25.510692] SyS_sendto+0x40/0x50 [ 25.514126] ? SyS_getpeername+0x30/0x30 [ 25.518163] do_fast_syscall_32+0x3ee/0xfa1 [ 25.522463] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.527020] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.532529] ? syscall_return_slowpath+0x550/0x550 [ 25.537432] ? syscall_return_slowpath+0x2ac/0x550 [ 25.542341] ? retint_user+0x18/0x18 [ 25.546043] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.550872] entry_SYSENTER_compat+0x54/0x63 [ 25.555253] RIP: 0023:0xf7ff8c79 [ 25.558588] RSP: 002b:00000000ffe9023c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 25.566268] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 25.573512] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020b2d000 [ 25.580757] RBP: 000000000