[....] Starting enhanced syslogd: rsyslogd[ 15.444568] audit: type=1400 audit(1518652437.885:5): avc: denied { syslog } for pid=3945 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: [ 17.957110] audit: type=1400 audit(1518652440.397:6): avc: denied { map } for pid=4085 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 '10.128.15.198' (ECDSA) to the list of known hosts. executing program [ 24.227766] audit: type=1400 audit(1518652446.668:7): avc: denied { map } for pid=4099 comm="syzkaller025705" path="/root/syzkaller025705884" 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 [ 24.254869] [ 24.256590] ============================= [ 24.260862] WARNING: suspicious RCU usage [ 24.265036] 4.16.0-rc1+ #222 Not tainted [ 24.269100] ----------------------------- [ 24.273256] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.282545] [ 24.282545] other info that might help us debug this: [ 24.282545] [ 24.290695] [ 24.290695] rcu_scheduler_active = 2, debug_locks = 1 [ 24.297377] 1 lock held by syzkaller025705/4099: [ 24.302141] #0: (rcu_read_lock){....}, at: [<000000002649a4b0>] __rds_conn_create+0xe46/0x1b50 [ 24.311101] [ 24.311101] stack backtrace: [ 24.315614] CPU: 1 PID: 4099 Comm: syzkaller025705 Not tainted 4.16.0-rc1+ #222 [ 24.323044] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.332372] Call Trace: [ 24.334938] dump_stack+0x194/0x257 [ 24.338539] ? arch_local_irq_restore+0x53/0x53 [ 24.343203] lockdep_rcu_suspicious+0x123/0x170 [ 24.347846] ___might_sleep+0x385/0x470 [ 24.351803] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.357660] ? __debug_object_init+0x235/0x1040 [ 24.362307] ? debug_mutex_init+0x1c/0x60 [ 24.366435] __might_sleep+0x95/0x190 [ 24.370215] kmem_cache_alloc_trace+0x299/0x740 [ 24.374858] ? lock_acquire+0x1d5/0x580 [ 24.378802] ? lock_acquire+0x1d5/0x580 [ 24.383345] ? __rds_conn_create+0xe46/0x1b50 [ 24.387819] rds_loop_conn_alloc+0xc8/0x380 [ 24.392120] ? rds_loop_conn_free+0x290/0x290 [ 24.396592] ? __init_waitqueue_head+0x97/0x140 [ 24.401246] ? rcutorture_record_progress+0x10/0x10 [ 24.406239] ? __lockdep_init_map+0xe4/0x650 [ 24.410626] __rds_conn_create+0x112f/0x1b50 [ 24.415039] ? rds_conn_drop+0xb0/0xb0 [ 24.418912] ? __raw_spin_lock_init+0x1c/0x100 [ 24.423468] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.428462] ? __lockdep_init_map+0xe4/0x650 [ 24.432856] ? lockdep_init_map+0x9/0x10 [ 24.436893] ? __init_waitqueue_head+0x97/0x140 [ 24.441535] ? init_wait_entry+0x1b0/0x1b0 [ 24.445747] ? lockdep_init_map+0x9/0x10 [ 24.449784] ? rds_message_alloc+0x28c/0x330 [ 24.454166] ? rds_message_next_extension+0x210/0x210 [ 24.459326] ? trace_hardirqs_on+0xd/0x10 [ 24.463452] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.467838] ? __release_sock+0x360/0x360 [ 24.471957] ? lock_sock_nested+0x91/0x110 [ 24.476168] rds_conn_create_outgoing+0x3f/0x50 [ 24.480813] rds_sendmsg+0xda3/0x2390 [ 24.484585] ? avc_has_perm+0x43e/0x680 [ 24.488548] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.493021] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.497515] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.502508] ? find_held_lock+0x35/0x1d0 [ 24.506553] ? sock_has_perm+0x2a4/0x420 [ 24.510590] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.515925] ? lock_release+0xa02/0xa40 [ 24.519876] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.525734] ? __check_object_size+0x8b/0x530 [ 24.530225] ? __might_sleep+0x95/0x190 [ 24.534177] ? selinux_socket_sendmsg+0x36/0x40 [ 24.538818] ? security_socket_sendmsg+0x89/0xb0 [ 24.543548] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.548027] sock_sendmsg+0xca/0x110 [ 24.551722] SYSC_sendto+0x361/0x5c0 [ 24.555415] ? SYSC_connect+0x4a0/0x4a0 [ 24.559364] ? find_held_lock+0x35/0x1d0 [ 24.563409] ? lock_downgrade+0x980/0x980 [ 24.567553] ? up_read+0x1a/0x40 [ 24.570897] ? __do_page_fault+0x3d6/0xc90 [ 24.575115] SyS_sendto+0x40/0x50 [ 24.578558] ? SyS_getpeername+0x30/0x30 [ 24.582599] do_fast_syscall_32+0x3ee/0xfa1 [ 24.586901] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.591469] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.596213] ? syscall_return_slowpath+0x550/0x550 [ 24.601119] ? syscall_return_slowpath+0x2ac/0x550 [ 24.606029] ? prepare_exit_to_usermode+0x350/0x350 [ 24.611034] ? retint_user+0x18/0x18 [ 24.614727] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.619552] entry_SYSENTER_compat+0x54/0x63 [ 24.623933] RIP: 0023:0xf7f51c79 [ 24.627278] RSP: 002b:00000000fff980bc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 24.634962] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020214b80 [ 24.642202] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002069affb [ 24.649444] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 24.656686] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.663927] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.671247] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.678706] in_atomic(): 1, irqs_disabled(): 0, pid: 4099, name: syzkaller025705 [ 24.686258] 1 lock held by syzkaller025705/4099: [ 24.691037] #0: (rcu_read_lock){....}, at: [<000000002649a4b0>] __rds_conn_create+0xe46/0x1b50 [ 24.700004] CPU: 1 PID: 4099 Comm: syzkaller025705 Not tainted 4.16.0-rc1+ #222 [ 24.707432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.716758] Call Trace: [ 24.719322] dump_stack+0x194/0x257 [ 24.722925] ? arch_local_irq_restore+0x53/0x53 [ 24.727571] ? print_lock+0x9f/0xa2 [ 24.731170] ? lockdep_print_held_locks+0xc4/0x130 [ 24.736080] ___might_sleep+0x2b2/0x470 [ 24.740033] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.745890] ? __debug_object_init+0x235/0x1040 [ 24.750533] ? debug_mutex_init+0x1c/0x60 [ 24.754660] __might_sleep+0x95/0x190 [ 24.758438] kmem_cache_alloc_trace+0x299/0x740 [ 24.763081] ? lock_acquire+0x1d5/0x580 [ 24.767032] ? lock_acquire+0x1d5/0x580 [ 24.770984] ? __rds_conn_create+0xe46/0x1b50 [ 24.775466] rds_loop_conn_alloc+0xc8/0x380 [ 24.779760] ? rds_loop_conn_free+0x290/0x290 [ 24.784228] ? __init_waitqueue_head+0x97/0x140 [ 24.788877] ? rcutorture_record_progress+0x10/0x10 [ 24.793867] ? __lockdep_init_map+0xe4/0x650 [ 24.798254] __rds_conn_create+0x112f/0x1b50 [ 24.802664] ? rds_conn_drop+0xb0/0xb0 [ 24.806537] ? __raw_spin_lock_init+0x1c/0x100 [ 24.811095] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.816092] ? __lockdep_init_map+0xe4/0x650 [ 24.820477] ? lockdep_init_map+0x9/0x10 [ 24.824511] ? __init_waitqueue_head+0x97/0x140 [ 24.829152] ? init_wait_entry+0x1b0/0x1b0 [ 24.833363] ? lockdep_init_map+0x9/0x10 [ 24.837402] ? rds_message_alloc+0x28c/0x330 [ 24.841784] ? rds_message_next_extension+0x210/0x210 [ 24.846944] ? trace_hardirqs_on+0xd/0x10 [ 24.851072] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.855458] ? __release_sock+0x360/0x360 [ 24.859578] ? lock_sock_nested+0x91/0x110 [ 24.863799] rds_conn_create_outgoing+0x3f/0x50 [ 24.868455] rds_sendmsg+0xda3/0x2390 [ 24.872229] ? avc_has_perm+0x43e/0x680 [ 24.876190] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.880660] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.885132] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.890144] ? find_held_lock+0x35/0x1d0 [ 24.894187] ? sock_has_perm+0x2a4/0x420 [ 24.898221] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.903556] ? lock_release+0xa02/0xa40 [ 24.907505] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.913382] ? __check_object_size+0x8b/0x530 [ 24.917857] ? __might_sleep+0x95/0x190 [ 24.921807] ? selinux_socket_sendmsg+0x36/0x40 [ 24.926447] ? security_socket_sendmsg+0x89/0xb0 [ 24.931175] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.935647] sock_sendmsg+0xca/0x110 [ 24.939336] SYSC_sendto+0x361/0x5c0 [ 24.943034] ? SYSC_connect+0x4a0/0x4a0 [ 24.946986] ? find_held_lock+0x35/0x1d0 [ 24.951040] ? lock_downgrade+0x980/0x980 [ 24.955183] ? up_read+0x1a/0x40 [ 24.958523] ? __do_page_fault+0x3d6/0xc90 [ 24.962738] SyS_sendto+0x40/0x50 [ 24.966167] ? SyS_getpeername+0x30/0x30 [ 24.970203] do_fast_syscall_32+0x3ee/0xfa1 [ 24.974503] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.979067] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.983807] ? syscall_return_slowpath+0x550/0x550 [ 24.988710] ? syscall_return_slowpath+0x2ac/0x550 [ 24.993612] ? prepare_exit_to_usermode+0x350/0x350 [ 24.998603] ? retint_user+0x18/0x18 [ 25.002295] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.007120] entry_SYSENTER_compat+0x54/0x63 [ 25.011499] RIP: 0023:0xf7f51c79 [ 25.014837] RSP: 002b:00000000fff980bc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 25.022525] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020214b80 [ 25.029766] RD