[....] Starting enhanced syslogd: rsyslogd[ 15.175575] audit: type=1400 audit(1518311276.202:5): avc: denied { syslog } for pid=3921 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: [ 18.124321] audit: type=1400 audit(1518311279.151:6): avc: denied { map } for pid=4058 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 '10.128.0.38' (ECDSA) to the list of known hosts. executing program [ 24.434480] audit: type=1400 audit(1518311285.461:7): avc: denied { map } for pid=4072 comm="syzkaller387881" path="/root/syzkaller387881467" 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 [ 24.460579] [ 24.462276] ============================= [ 24.466423] WARNING: suspicious RCU usage [ 24.470569] 4.15.0+ #218 Not tainted [ 24.474280] ----------------------------- [ 24.478424] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.487715] [ 24.487715] other info that might help us debug this: [ 24.487715] [ 24.495857] [ 24.495857] rcu_scheduler_active = 2, debug_locks = 1 [ 24.502522] 1 lock held by syzkaller387881/4072: [ 24.507268] #0: (rcu_read_lock){....}, at: [<000000002907ecfb>] __rds_conn_create+0xe46/0x1b50 [ 24.516202] [ 24.516202] stack backtrace: [ 24.520705] CPU: 0 PID: 4072 Comm: syzkaller387881 Not tainted 4.15.0+ #218 [ 24.527781] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.537106] Call Trace: [ 24.539668] dump_stack+0x194/0x257 [ 24.543268] ? arch_local_irq_restore+0x53/0x53 [ 24.547925] lockdep_rcu_suspicious+0x123/0x170 [ 24.552570] ___might_sleep+0x385/0x470 [ 24.556516] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.562371] ? __debug_object_init+0x235/0x1040 [ 24.567021] ? debug_mutex_init+0x1c/0x60 [ 24.571153] __might_sleep+0x95/0x190 [ 24.574932] kmem_cache_alloc_trace+0x299/0x740 [ 24.579572] ? lock_acquire+0x1d5/0x580 [ 24.583523] ? lock_acquire+0x1d5/0x580 [ 24.587471] ? __rds_conn_create+0xe46/0x1b50 [ 24.591942] rds_loop_conn_alloc+0xc8/0x380 [ 24.596236] ? rds_loop_conn_free+0x290/0x290 [ 24.600705] ? __init_waitqueue_head+0x97/0x140 [ 24.605351] ? rcutorture_record_progress+0x10/0x10 [ 24.610339] ? __lockdep_init_map+0xe4/0x650 [ 24.614722] __rds_conn_create+0x112f/0x1b50 [ 24.619119] ? rds_conn_drop+0xb0/0xb0 [ 24.622989] ? __raw_spin_lock_init+0x1c/0x100 [ 24.627547] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.632539] ? __lockdep_init_map+0xe4/0x650 [ 24.636921] ? lockdep_init_map+0x9/0x10 [ 24.640953] ? __init_waitqueue_head+0x97/0x140 [ 24.645596] ? init_wait_entry+0x1b0/0x1b0 [ 24.649807] ? lockdep_init_map+0x9/0x10 [ 24.653845] ? rds_message_alloc+0x28c/0x330 [ 24.658223] ? rds_message_next_extension+0x210/0x210 [ 24.663382] ? trace_hardirqs_on+0xd/0x10 [ 24.667506] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.671888] ? __release_sock+0x360/0x360 [ 24.676004] ? lock_sock_nested+0x91/0x110 [ 24.680220] rds_conn_create_outgoing+0x3f/0x50 [ 24.684863] rds_sendmsg+0xda3/0x2390 [ 24.688636] ? avc_has_perm+0x43e/0x680 [ 24.692594] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.697060] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.701529] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.706520] ? find_held_lock+0x35/0x1d0 [ 24.710564] ? sock_has_perm+0x2a4/0x420 [ 24.714597] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.719932] ? lock_release+0xa22/0xa40 [ 24.723876] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.729730] ? __check_object_size+0x8b/0x530 [ 24.734203] ? __might_sleep+0x95/0x190 [ 24.738155] ? selinux_socket_sendmsg+0x36/0x40 [ 24.742796] ? security_socket_sendmsg+0x89/0xb0 [ 24.747524] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.751993] sock_sendmsg+0xca/0x110 [ 24.755683] SYSC_sendto+0x361/0x5c0 [ 24.759371] ? SYSC_connect+0x4a0/0x4a0 [ 24.763328] ? schedule+0xf5/0x430 [ 24.766838] ? SYSC_bind+0x290/0x410 [ 24.770543] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.775187] ? trace_hardirqs_off+0xd/0x10 [ 24.779391] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.784122] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.789636] SyS_sendto+0x40/0x50 [ 24.793061] ? SyS_getpeername+0x30/0x30 [ 24.797096] do_fast_syscall_32+0x3ee/0xfa1 [ 24.801394] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.805947] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.810676] ? syscall_return_slowpath+0x550/0x550 [ 24.815577] ? syscall_return_slowpath+0x2ac/0x550 [ 24.820480] ? prepare_exit_to_usermode+0x350/0x350 [ 24.825470] ? sysret32_from_system_call+0x5/0x3b [ 24.830294] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.835113] entry_SYSENTER_compat+0x54/0x63 [ 24.839490] RIP: 0023:0xf7f6cc79 [ 24.842827] RSP: 002b:00000000ffc0816c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 24.850503] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020007000 [ 24.857742] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 [ 24.864980] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 24.872222] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.879462] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.886758] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.894198] in_atomic(): 1, irqs_disabled(): 0, pid: 4072, name: syzkaller387881 [ 24.901729] 1 lock held by syzkaller387881/4072: [ 24.906479] #0: (rcu_read_lock){....}, at: [<000000002907ecfb>] __rds_conn_create+0xe46/0x1b50 [ 24.915421] CPU: 0 PID: 4072 Comm: syzkaller387881 Not tainted 4.15.0+ #218 [ 24.922499] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.931821] Call Trace: [ 24.934380] dump_stack+0x194/0x257 [ 24.937983] ? arch_local_irq_restore+0x53/0x53 [ 24.942625] ? print_lock+0x9f/0xa2 [ 24.946226] ? lockdep_print_held_locks+0xc4/0x130 [ 24.951133] ___might_sleep+0x2b2/0x470 [ 24.955081] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.960936] ? __debug_object_init+0x235/0x1040 [ 24.965576] ? debug_mutex_init+0x1c/0x60 [ 24.969700] __might_sleep+0x95/0x190 [ 24.973482] kmem_cache_alloc_trace+0x299/0x740 [ 24.978124] ? lock_acquire+0x1d5/0x580 [ 24.982068] ? lock_acquire+0x1d5/0x580 [ 24.986020] ? __rds_conn_create+0xe46/0x1b50 [ 24.990495] rds_loop_conn_alloc+0xc8/0x380 [ 24.994791] ? rds_loop_conn_free+0x290/0x290 [ 24.999260] ? __init_waitqueue_head+0x97/0x140 [ 25.003904] ? rcutorture_record_progress+0x10/0x10 [ 25.008895] ? __lockdep_init_map+0xe4/0x650 [ 25.013282] __rds_conn_create+0x112f/0x1b50 [ 25.017681] ? rds_conn_drop+0xb0/0xb0 [ 25.021552] ? __raw_spin_lock_init+0x1c/0x100 [ 25.026110] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.031104] ? __lockdep_init_map+0xe4/0x650 [ 25.035488] ? lockdep_init_map+0x9/0x10 [ 25.039521] ? __init_waitqueue_head+0x97/0x140 [ 25.044161] ? init_wait_entry+0x1b0/0x1b0 [ 25.048373] ? lockdep_init_map+0x9/0x10 [ 25.052408] ? rds_message_alloc+0x28c/0x330 [ 25.056787] ? rds_message_next_extension+0x210/0x210 [ 25.061946] ? trace_hardirqs_on+0xd/0x10 [ 25.066069] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.070455] ? __release_sock+0x360/0x360 [ 25.074572] ? lock_sock_nested+0x91/0x110 [ 25.078781] rds_conn_create_outgoing+0x3f/0x50 [ 25.083426] rds_sendmsg+0xda3/0x2390 [ 25.087196] ? avc_has_perm+0x43e/0x680 [ 25.091155] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.095622] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.100092] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.105089] ? find_held_lock+0x35/0x1d0 [ 25.109134] ? sock_has_perm+0x2a4/0x420 [ 25.113170] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.118508] ? lock_release+0xa22/0xa40 [ 25.122458] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.128318] ? __check_object_size+0x8b/0x530 [ 25.132794] ? __might_sleep+0x95/0x190 [ 25.136746] ? selinux_socket_sendmsg+0x36/0x40 [ 25.141386] ? security_socket_sendmsg+0x89/0xb0 [ 25.146114] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.150584] sock_sendmsg+0xca/0x110 [ 25.154274] SYSC_sendto+0x361/0x5c0 [ 25.157962] ? SYSC_connect+0x4a0/0x4a0 [ 25.161920] ? schedule+0xf5/0x430 [ 25.165434] ? SYSC_bind+0x290/0x410 [ 25.169138] ? exit_to_usermode_loop+0x8c/0x2f0 [ 25.173784] ? trace_hardirqs_off+0xd/0x10 [ 25.177993] ? exit_to_usermode_loop+0x198/0x2f0 [ 25.182735] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.188252] SyS_sendto+0x40/0x50 [ 25.191678] ? SyS_getpeername+0x30/0x30 [ 25.195712] do_fast_syscall_32+0x3ee/0xfa1 [ 25.200018] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.204581] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.209310] ? syscall_return_slowpath+0x550/0x550 [ 25.214211] ? syscall_return_slowpath+0x2ac/0x550 [ 25.219115] ? prepare_exit_to_usermode+0x350/0x350 [ 25.224103] ? sysret32_from_system_call+0x5/0x3b [ 25.228922] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.233742] entry_SYSENTER_compat+0x54/0x63 [