[....] Starting enhanced syslogd: rsyslogd[ 15.789581] audit: type=1400 audit(1518415954.419:5): 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: [ 19.076470] audit: type=1400 audit(1518415957.706:6): avc: denied { map } for pid=4151 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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program [ 25.634398] audit: type=1400 audit(1518415964.264:7): avc: denied { map } for pid=4165 comm="syzkaller135729" path="/root/syzkaller135729115" 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 [ 25.660585] [ 25.662326] ============================= [ 25.666480] WARNING: suspicious RCU usage [ 25.670640] 4.16.0-rc1+ #219 Not tainted [ 25.674712] ----------------------------- [ 25.678888] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.688158] [ 25.688158] other info that might help us debug this: [ 25.688158] [ 25.696308] [ 25.696308] rcu_scheduler_active = 2, debug_locks = 1 [ 25.703000] 1 lock held by syzkaller135729/4165: [ 25.707776] #0: (rcu_read_lock){....}, at: [<000000006e8c2788>] __rds_conn_create+0xe46/0x1b50 [ 25.716729] [ 25.716729] stack backtrace: [ 25.721236] CPU: 1 PID: 4165 Comm: syzkaller135729 Not tainted 4.16.0-rc1+ #219 [ 25.728661] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.737989] Call Trace: [ 25.740556] dump_stack+0x194/0x257 [ 25.744161] ? arch_local_irq_restore+0x53/0x53 [ 25.748814] lockdep_rcu_suspicious+0x123/0x170 [ 25.753458] ___might_sleep+0x385/0x470 [ 25.757409] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.763264] ? __debug_object_init+0x235/0x1040 [ 25.767904] ? lock_acquire+0x1d5/0x580 [ 25.771854] ? debug_mutex_init+0x1c/0x60 [ 25.775981] __might_sleep+0x95/0x190 [ 25.779760] kmem_cache_alloc_trace+0x299/0x740 [ 25.784417] ? lock_acquire+0x1d5/0x580 [ 25.788372] ? lock_acquire+0x1d5/0x580 [ 25.792334] ? __rds_conn_create+0xe46/0x1b50 [ 25.796809] rds_loop_conn_alloc+0xc8/0x380 [ 25.801109] ? rds_loop_conn_free+0x290/0x290 [ 25.805578] ? __init_waitqueue_head+0x97/0x140 [ 25.810224] ? rcutorture_record_progress+0x10/0x10 [ 25.815216] ? __lockdep_init_map+0xe4/0x650 [ 25.819603] __rds_conn_create+0x112f/0x1b50 [ 25.824001] ? rds_conn_drop+0xb0/0xb0 [ 25.827878] ? lock_release+0xa40/0xa40 [ 25.831832] ? __raw_spin_lock_init+0x1c/0x100 [ 25.836395] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.841390] ? __lockdep_init_map+0xe4/0x650 [ 25.845773] ? lockdep_init_map+0x9/0x10 [ 25.849811] ? __init_waitqueue_head+0x97/0x140 [ 25.854457] ? init_wait_entry+0x1b0/0x1b0 [ 25.858674] ? lockdep_init_map+0x9/0x10 [ 25.862714] ? rds_message_alloc+0x28c/0x330 [ 25.867097] ? rds_message_next_extension+0x210/0x210 [ 25.872267] ? trace_hardirqs_on+0xd/0x10 [ 25.876395] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.880784] ? __release_sock+0x360/0x360 [ 25.884905] ? lock_sock_nested+0x91/0x110 [ 25.889126] rds_conn_create_outgoing+0x3f/0x50 [ 25.893775] rds_sendmsg+0xda3/0x2390 [ 25.897562] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.902043] ? find_held_lock+0x35/0x1d0 [ 25.906091] ? __might_fault+0x110/0x1d0 [ 25.910126] ? lock_downgrade+0x980/0x980 [ 25.914255] ? sock_has_perm+0x2a4/0x420 [ 25.918292] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.923635] ? __might_sleep+0x95/0x190 [ 25.927591] ? kasan_check_write+0x14/0x20 [ 25.931797] ? _copy_from_user+0x99/0x110 [ 25.935923] ? selinux_socket_sendmsg+0x36/0x40 [ 25.940567] ? security_socket_sendmsg+0x89/0xb0 [ 25.945303] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.949779] sock_sendmsg+0xca/0x110 [ 25.953469] ___sys_sendmsg+0x767/0x8b0 [ 25.957422] ? copy_msghdr_from_user+0x590/0x590 [ 25.962164] ? _raw_spin_unlock+0x22/0x30 [ 25.966288] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.970761] ? __pmd_alloc+0x4e0/0x4e0 [ 25.974623] ? check_noncircular+0x20/0x20 [ 25.978836] ? __fget_light+0x2b2/0x3c0 [ 25.982795] ? handle_mm_fault+0x270/0x970 [ 25.987008] ? find_held_lock+0x35/0x1d0 [ 25.991067] __sys_sendmsg+0xe5/0x210 [ 25.994840] ? __sys_sendmsg+0xe5/0x210 [ 25.998791] ? SyS_shutdown+0x290/0x290 [ 26.002739] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 26.007297] ? vmacache_find+0x5f/0x280 [ 26.011266] compat_SyS_sendmsg+0x2a/0x40 [ 26.015387] ? compat_SyS_getsockopt+0x420/0x420 [ 26.020117] do_fast_syscall_32+0x3ee/0xfa1 [ 26.024420] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.028977] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.033706] ? syscall_return_slowpath+0x550/0x550 [ 26.038610] ? syscall_return_slowpath+0x2ac/0x550 [ 26.043514] ? prepare_exit_to_usermode+0x350/0x350 [ 26.048504] ? retint_user+0x18/0x18 [ 26.052195] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.057028] entry_SYSENTER_compat+0x54/0x63 [ 26.061411] RIP: 0023:0xf7f00c79 [ 26.064749] RSP: 002b:00000000fff25ccc EFLAGS: 00000217 ORIG_RAX: 0000000000000172 [ 26.072431] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020fc5fc8 [ 26.079672] RDX: 0000000000000000 RSI: 000000000000016a RDI: 0000000000000003 [ 26.086916] RBP: 0000000020fc4000 R08: 0000000000000000 R09: 0000000000000000 [ 26.094162] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 26.101405] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 26.108720] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.116178] in_atomic(): 1, irqs_disabled(): 0, pid: 4165, name: syzkaller135729 [ 26.123725] 1 lock held by syzkaller135729/4165: [ 26.128483] #0: (rcu_read_lock){....}, at: [<000000006e8c2788>] __rds_conn_create+0xe46/0x1b50 [ 26.137449] CPU: 1 PID: 4165 Comm: syzkaller135729 Not tainted 4.16.0-rc1+ #219 [ 26.144884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.154222] Call Trace: [ 26.156807] dump_stack+0x194/0x257 [ 26.160431] ? arch_local_irq_restore+0x53/0x53 [ 26.165091] ? print_lock+0x9f/0xa2 [ 26.168721] ? lockdep_print_held_locks+0xc4/0x130 [ 26.173639] ___might_sleep+0x2b2/0x470 [ 26.177596] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.183460] ? __debug_object_init+0x235/0x1040 [ 26.188116] ? lock_acquire+0x1d5/0x580 [ 26.192075] ? debug_mutex_init+0x1c/0x60 [ 26.196207] __might_sleep+0x95/0x190 [ 26.200082] kmem_cache_alloc_trace+0x299/0x740 [ 26.204735] ? lock_acquire+0x1d5/0x580 [ 26.208690] ? lock_acquire+0x1d5/0x580 [ 26.212646] ? __rds_conn_create+0xe46/0x1b50 [ 26.217134] rds_loop_conn_alloc+0xc8/0x380 [ 26.221444] ? rds_loop_conn_free+0x290/0x290 [ 26.225920] ? __init_waitqueue_head+0x97/0x140 [ 26.230575] ? rcutorture_record_progress+0x10/0x10 [ 26.235571] ? __lockdep_init_map+0xe4/0x650 [ 26.239958] __rds_conn_create+0x112f/0x1b50 [ 26.244358] ? rds_conn_drop+0xb0/0xb0 [ 26.248222] ? lock_release+0xa40/0xa40 [ 26.252173] ? __raw_spin_lock_init+0x1c/0x100 [ 26.256731] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.261725] ? __lockdep_init_map+0xe4/0x650 [ 26.266107] ? lockdep_init_map+0x9/0x10 [ 26.270153] ? __init_waitqueue_head+0x97/0x140 [ 26.274801] ? init_wait_entry+0x1b0/0x1b0 [ 26.279014] ? lockdep_init_map+0x9/0x10 [ 26.283052] ? rds_message_alloc+0x28c/0x330 [ 26.287439] ? rds_message_next_extension+0x210/0x210 [ 26.292600] ? trace_hardirqs_on+0xd/0x10 [ 26.296728] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.301114] ? __release_sock+0x360/0x360 [ 26.305233] ? lock_sock_nested+0x91/0x110 [ 26.309444] rds_conn_create_outgoing+0x3f/0x50 [ 26.314089] rds_sendmsg+0xda3/0x2390 [ 26.317881] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.322353] ? find_held_lock+0x35/0x1d0 [ 26.326395] ? __might_fault+0x110/0x1d0 [ 26.330429] ? lock_downgrade+0x980/0x980 [ 26.334556] ? sock_has_perm+0x2a4/0x420 [ 26.338595] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.343936] ? __might_sleep+0x95/0x190 [ 26.347892] ? kasan_check_write+0x14/0x20 [ 26.352099] ? _copy_from_user+0x99/0x110 [ 26.356227] ? selinux_socket_sendmsg+0x36/0x40 [ 26.360872] ? security_socket_sendmsg+0x89/0xb0 [ 26.365605] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.370075] sock_sendmsg+0xca/0x110 [ 26.373767] ___sys_sendmsg+0x767/0x8b0 [ 26.377720] ? copy_msghdr_from_user+0x590/0x590 [ 26.382454] ? _raw_spin_unlock+0x22/0x30 [ 26.386581] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.391061] ? __pmd_alloc+0x4e0/0x4e0 [ 26.394919] ? check_noncircular+0x20/0x20 [ 26.399128] ? __fget_light+0x2b2/0x3c0 [ 26.403086] ? handle_mm_fault+0x270/0x970 [ 26.407296] ? find_held_lock+0x35/0x1d0 [ 26.411346] __sys_sendmsg+0xe5/0x210 [ 26.415128] ? __sys_sendmsg+0xe5/0x210 [ 26.419077] ? SyS_shutdown+0x290/0x290 [ 26.423036] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 26.427594] ? vmacache_find+0x5f/0x280 [ 26.431571] compat_SyS_sendmsg+0x2a/0x40 [ 26.435690] ? compat_SyS_getsockopt+0x420/0x420 [ 26.440422] do_fast_syscall_32+0x3ee/0xfa1 [ 26.444724] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.449277] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.454006] ? syscall_return_slowpath+0x550/0x550 [ 26.458915] ? syscall_return_slowpath+0x2ac/0x550 [ 26.463816] ? prepare_exit_to_usermode+0x350/0x350 [ 26.468815] ? retint_user+0x18/0x18 [ 26.472509] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.477330] entry_SYSENTER_compat+0x54/0x63 [ 26.481712] RIP: 0023:0xf7f00c79 [ 26.485047] RSP: 002b:00000000fff25