[....] Starting enhanced syslogd: rsyslogd[ 15.498688] audit: type=1400 audit(1518434785.068:5): avc: denied { syslog } for pid=4005 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: [ 18.017433] audit: type=1400 audit(1518434787.587:6): avc: denied { map } for pid=4144 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 '10.128.0.57' (ECDSA) to the list of known hosts. executing program [ 28.223618] audit: type=1400 audit(1518434797.793:7): avc: denied { map } for pid=4159 comm="syzkaller520708" path="/root/syzkaller520708749" 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 [ 28.250475] [ 28.252165] ============================= [ 28.256321] WARNING: suspicious RCU usage [ 28.260472] 4.16.0-rc1+ #219 Not tainted [ 28.264531] ----------------------------- [ 28.268675] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.277952] [ 28.277952] other info that might help us debug this: [ 28.277952] [ 28.286098] [ 28.286098] rcu_scheduler_active = 2, debug_locks = 1 [ 28.292767] 1 lock held by syzkaller520708/4159: [ 28.297518] #0: (rcu_read_lock){....}, at: [<0000000037e2cff9>] __rds_conn_create+0xe46/0x1b50 [ 28.306470] [ 28.306470] stack backtrace: [ 28.310968] CPU: 0 PID: 4159 Comm: syzkaller520708 Not tainted 4.16.0-rc1+ #219 [ 28.318387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.327712] Call Trace: [ 28.330273] dump_stack+0x194/0x257 [ 28.333883] ? arch_local_irq_restore+0x53/0x53 [ 28.338535] lockdep_rcu_suspicious+0x123/0x170 [ 28.343184] ___might_sleep+0x385/0x470 [ 28.347134] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.352989] ? __debug_object_init+0x235/0x1040 [ 28.357638] ? debug_mutex_init+0x1c/0x60 [ 28.361763] __might_sleep+0x95/0x190 [ 28.365542] kmem_cache_alloc_trace+0x299/0x740 [ 28.370188] ? lock_acquire+0x1d5/0x580 [ 28.374133] ? lock_acquire+0x1d5/0x580 [ 28.378078] ? __rds_conn_create+0xe46/0x1b50 [ 28.382547] rds_loop_conn_alloc+0xc8/0x380 [ 28.386840] ? rds_loop_conn_free+0x290/0x290 [ 28.391305] ? __init_waitqueue_head+0x97/0x140 [ 28.395952] ? rcutorture_record_progress+0x10/0x10 [ 28.400940] ? __lockdep_init_map+0xe4/0x650 [ 28.405329] __rds_conn_create+0x112f/0x1b50 [ 28.409736] ? rds_conn_drop+0xb0/0xb0 [ 28.413607] ? __raw_spin_lock_init+0x1c/0x100 [ 28.418162] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.423154] ? __lockdep_init_map+0xe4/0x650 [ 28.427537] ? lockdep_init_map+0x9/0x10 [ 28.431574] ? __init_waitqueue_head+0x97/0x140 [ 28.436215] ? init_wait_entry+0x1b0/0x1b0 [ 28.440425] ? lockdep_init_map+0x9/0x10 [ 28.444460] ? rds_message_alloc+0x28c/0x330 [ 28.448840] ? rds_message_next_extension+0x210/0x210 [ 28.454004] ? trace_hardirqs_on+0xd/0x10 [ 28.458130] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.462518] ? __release_sock+0x360/0x360 [ 28.466635] ? lock_sock_nested+0x91/0x110 [ 28.470845] rds_conn_create_outgoing+0x3f/0x50 [ 28.475489] rds_sendmsg+0xda3/0x2390 [ 28.479258] ? avc_has_perm+0x43e/0x680 [ 28.483217] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.487682] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.492151] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.497142] ? find_held_lock+0x35/0x1d0 [ 28.501186] ? sock_has_perm+0x2a4/0x420 [ 28.505221] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.510555] ? lock_release+0xa22/0xa40 [ 28.514503] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.520359] ? __check_object_size+0x8b/0x530 [ 28.524831] ? __might_sleep+0x95/0x190 [ 28.528782] ? selinux_socket_sendmsg+0x36/0x40 [ 28.533424] ? security_socket_sendmsg+0x89/0xb0 [ 28.538152] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.542622] sock_sendmsg+0xca/0x110 [ 28.546311] SYSC_sendto+0x361/0x5c0 [ 28.550005] ? SYSC_connect+0x4a0/0x4a0 [ 28.553954] ? find_held_lock+0x35/0x1d0 [ 28.557998] ? lock_downgrade+0x980/0x980 [ 28.562141] ? up_read+0x1a/0x40 [ 28.565482] ? __do_page_fault+0x3d6/0xc90 [ 28.569696] SyS_sendto+0x40/0x50 [ 28.573123] ? SyS_getpeername+0x30/0x30 [ 28.577158] do_fast_syscall_32+0x3ee/0xfa1 [ 28.581461] ? do_int80_syscall_32+0x9d0/0x9d0 [ 28.586017] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.590746] ? syscall_return_slowpath+0x550/0x550 [ 28.595649] ? syscall_return_slowpath+0x2ac/0x550 [ 28.600559] ? prepare_exit_to_usermode+0x350/0x350 [ 28.605546] ? retint_user+0x18/0x18 [ 28.609238] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.614058] entry_SYSENTER_compat+0x54/0x63 [ 28.618438] RIP: 0023:0xf7fd9c79 [ 28.621775] RSP: 002b:00000000ffbeea0c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 28.629453] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200f7000 [ 28.636693] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020dfcff0 [ 28.643934] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 28.651176] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 28.658417] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.665873] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 28.673330] in_atomic(): 1, irqs_disabled(): 0, pid: 4159, name: syzkaller520708 [ 28.680870] 1 lock held by syzkaller520708/4159: [ 28.685627] #0: (rcu_read_lock){....}, at: [<0000000037e2cff9>] __rds_conn_create+0xe46/0x1b50 [ 28.694595] CPU: 0 PID: 4159 Comm: syzkaller520708 Not tainted 4.16.0-rc1+ #219 [ 28.702012] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.711346] Call Trace: [ 28.713921] dump_stack+0x194/0x257 [ 28.717527] ? arch_local_irq_restore+0x53/0x53 [ 28.722171] ? print_lock+0x9f/0xa2 [ 28.725772] ? lockdep_print_held_locks+0xc4/0x130 [ 28.730678] ___might_sleep+0x2b2/0x470 [ 28.734624] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.740482] ? __debug_object_init+0x235/0x1040 [ 28.745123] ? debug_mutex_init+0x1c/0x60 [ 28.749246] __might_sleep+0x95/0x190 [ 28.753027] kmem_cache_alloc_trace+0x299/0x740 [ 28.757667] ? lock_acquire+0x1d5/0x580 [ 28.761612] ? lock_acquire+0x1d5/0x580 [ 28.765560] ? __rds_conn_create+0xe46/0x1b50 [ 28.770034] rds_loop_conn_alloc+0xc8/0x380 [ 28.774329] ? rds_loop_conn_free+0x290/0x290 [ 28.778797] ? __init_waitqueue_head+0x97/0x140 [ 28.783443] ? rcutorture_record_progress+0x10/0x10 [ 28.788434] ? __lockdep_init_map+0xe4/0x650 [ 28.792818] __rds_conn_create+0x112f/0x1b50 [ 28.797218] ? rds_conn_drop+0xb0/0xb0 [ 28.801088] ? __raw_spin_lock_init+0x1c/0x100 [ 28.805644] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.810638] ? __lockdep_init_map+0xe4/0x650 [ 28.815021] ? lockdep_init_map+0x9/0x10 [ 28.819055] ? __init_waitqueue_head+0x97/0x140 [ 28.823695] ? init_wait_entry+0x1b0/0x1b0 [ 28.827911] ? lockdep_init_map+0x9/0x10 [ 28.831951] ? rds_message_alloc+0x28c/0x330 [ 28.836333] ? rds_message_next_extension+0x210/0x210 [ 28.841494] ? trace_hardirqs_on+0xd/0x10 [ 28.845621] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.850008] ? __release_sock+0x360/0x360 [ 28.854130] ? lock_sock_nested+0x91/0x110 [ 28.858339] rds_conn_create_outgoing+0x3f/0x50 [ 28.862988] rds_sendmsg+0xda3/0x2390 [ 28.866767] ? avc_has_perm+0x43e/0x680 [ 28.870727] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.875198] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.879675] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.884668] ? find_held_lock+0x35/0x1d0 [ 28.888709] ? sock_has_perm+0x2a4/0x420 [ 28.892743] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.898078] ? lock_release+0xa22/0xa40 [ 28.902022] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.907878] ? __check_object_size+0x8b/0x530 [ 28.912354] ? __might_sleep+0x95/0x190 [ 28.916307] ? selinux_socket_sendmsg+0x36/0x40 [ 28.920965] ? security_socket_sendmsg+0x89/0xb0 [ 28.925696] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.930165] sock_sendmsg+0xca/0x110 [ 28.933851] SYSC_sendto+0x361/0x5c0 [ 28.937538] ? SYSC_connect+0x4a0/0x4a0 [ 28.941489] ? find_held_lock+0x35/0x1d0 [ 28.945532] ? lock_downgrade+0x980/0x980 [ 28.949676] ? up_read+0x1a/0x40 [ 28.953017] ? __do_page_fault+0x3d6/0xc90 [ 28.957234] SyS_sendto+0x40/0x50 [ 28.960670] ? SyS_getpeername+0x30/0x30 [ 28.964716] do_fast_syscall_32+0x3ee/0xfa1 [ 28.969018] ? do_int80_syscall_32+0x9d0/0x9d0 [ 28.973577] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.978307] ? syscall_return_slowpath+0x550/0x550 [ 28.983210] ? syscall_return_slowpath+0x2ac/0x550 [ 28.988113] ? prepare_exit_to_usermode+0x350/0x350 [ 28.993102] ? retint_user+0x18/0x18 [ 28.996795] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.001615] entry_SYSENTER_compat+0x54/0x63 [ 29.005996] RIP: 0023:0xf7fd9c79 [ 29.009329] RSP: 002b:00000000ffbeea0c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 29.017016] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200f7000 [ 29.024259] RDX: 000000000000000