[....] Starting enhanced syslogd: rsyslogd[ 15.115904] audit: type=1400 audit(1518397537.527:5): avc: denied { syslog } for pid=3999 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: [ 18.599207] audit: type=1400 audit(1518397541.011:6): avc: denied { map } for pid=4138 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 '10.128.15.196' (ECDSA) to the list of known hosts. executing program [ 27.051465] audit: type=1400 audit(1518397549.463:7): avc: denied { map } for pid=4153 comm="syzkaller865086" path="/root/syzkaller865086779" 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 [ 27.078457] [ 27.080169] ============================= [ 27.084317] WARNING: suspicious RCU usage [ 27.088465] 4.16.0-rc1+ #219 Not tainted [ 27.092523] ----------------------------- [ 27.096669] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 27.106168] [ 27.106168] other info that might help us debug this: [ 27.106168] [ 27.114351] [ 27.114351] rcu_scheduler_active = 2, debug_locks = 1 [ 27.121029] 1 lock held by syzkaller865086/4153: [ 27.125792] #0: (rcu_read_lock){....}, at: [<00000000b6004dbf>] __rds_conn_create+0xe46/0x1b50 [ 27.134750] [ 27.134750] stack backtrace: [ 27.139252] CPU: 0 PID: 4153 Comm: syzkaller865086 Not tainted 4.16.0-rc1+ #219 [ 27.146685] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.156018] Call Trace: [ 27.158592] dump_stack+0x194/0x257 [ 27.162194] ? arch_local_irq_restore+0x53/0x53 [ 27.166851] lockdep_rcu_suspicious+0x123/0x170 [ 27.171498] ___might_sleep+0x385/0x470 [ 27.175445] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.181301] ? __debug_object_init+0x235/0x1040 [ 27.185944] ? debug_mutex_init+0x1c/0x60 [ 27.190070] __might_sleep+0x95/0x190 [ 27.193850] kmem_cache_alloc_trace+0x299/0x740 [ 27.198494] ? lock_acquire+0x1d5/0x580 [ 27.202438] ? lock_acquire+0x1d5/0x580 [ 27.206386] ? __rds_conn_create+0xe46/0x1b50 [ 27.210857] rds_loop_conn_alloc+0xc8/0x380 [ 27.215153] ? rds_loop_conn_free+0x290/0x290 [ 27.219622] ? __init_waitqueue_head+0x97/0x140 [ 27.224268] ? rcutorture_record_progress+0x10/0x10 [ 27.229267] ? __lockdep_init_map+0xe4/0x650 [ 27.233655] __rds_conn_create+0x112f/0x1b50 [ 27.238062] ? rds_conn_drop+0xb0/0xb0 [ 27.241932] ? __raw_spin_lock_init+0x1c/0x100 [ 27.246488] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.251482] ? __lockdep_init_map+0xe4/0x650 [ 27.255865] ? lockdep_init_map+0x9/0x10 [ 27.259906] ? __init_waitqueue_head+0x97/0x140 [ 27.264548] ? init_wait_entry+0x1b0/0x1b0 [ 27.268761] ? lockdep_init_map+0x9/0x10 [ 27.272799] ? rds_message_alloc+0x28c/0x330 [ 27.277179] ? rds_message_next_extension+0x210/0x210 [ 27.282342] ? trace_hardirqs_on+0xd/0x10 [ 27.286465] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.290850] ? __release_sock+0x360/0x360 [ 27.294978] ? lock_sock_nested+0x91/0x110 [ 27.299198] rds_conn_create_outgoing+0x3f/0x50 [ 27.303845] rds_sendmsg+0xda3/0x2390 [ 27.307616] ? avc_has_perm+0x43e/0x680 [ 27.311576] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.316045] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.320514] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.325506] ? find_held_lock+0x35/0x1d0 [ 27.329551] ? sock_has_perm+0x2a4/0x420 [ 27.333588] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.338922] ? lock_release+0xa22/0xa40 [ 27.342872] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.348732] ? __check_object_size+0x8b/0x530 [ 27.353206] ? __might_sleep+0x95/0x190 [ 27.357161] ? selinux_socket_sendmsg+0x36/0x40 [ 27.361807] ? security_socket_sendmsg+0x89/0xb0 [ 27.366537] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.371011] sock_sendmsg+0xca/0x110 [ 27.374710] SYSC_sendto+0x361/0x5c0 [ 27.378402] ? SYSC_connect+0x4a0/0x4a0 [ 27.382353] ? find_held_lock+0x35/0x1d0 [ 27.386395] ? lock_downgrade+0x980/0x980 [ 27.390539] ? up_read+0x1a/0x40 [ 27.393886] ? __do_page_fault+0x3d6/0xc90 [ 27.398102] SyS_sendto+0x40/0x50 [ 27.401529] ? SyS_getpeername+0x30/0x30 [ 27.405566] do_fast_syscall_32+0x3ee/0xfa1 [ 27.409868] ? do_int80_syscall_32+0x9d0/0x9d0 [ 27.414425] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.419938] ? syscall_return_slowpath+0x550/0x550 [ 27.424852] ? syscall_return_slowpath+0x2ac/0x550 [ 27.429760] ? retint_user+0x18/0x18 [ 27.433453] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.438275] entry_SYSENTER_compat+0x54/0x63 [ 27.442656] RIP: 0023:0xf7f2ec79 [ 27.445997] RSP: 002b:00000000ffb6d6dc EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 27.453687] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 27.460931] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020062000 [ 27.468181] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 27.475424] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 27.482667] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.489970] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 27.497421] in_atomic(): 1, irqs_disabled(): 0, pid: 4153, name: syzkaller865086 [ 27.504957] 1 lock held by syzkaller865086/4153: [ 27.509734] #0: (rcu_read_lock){....}, at: [<00000000b6004dbf>] __rds_conn_create+0xe46/0x1b50 [ 27.518682] CPU: 0 PID: 4153 Comm: syzkaller865086 Not tainted 4.16.0-rc1+ #219 [ 27.526107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.535434] Call Trace: [ 27.538000] dump_stack+0x194/0x257 [ 27.541613] ? arch_local_irq_restore+0x53/0x53 [ 27.546261] ? print_lock+0x9f/0xa2 [ 27.549867] ? lockdep_print_held_locks+0xc4/0x130 [ 27.554777] ___might_sleep+0x2b2/0x470 [ 27.558728] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.564586] ? __debug_object_init+0x235/0x1040 [ 27.569319] ? debug_mutex_init+0x1c/0x60 [ 27.573445] __might_sleep+0x95/0x190 [ 27.577223] kmem_cache_alloc_trace+0x299/0x740 [ 27.581865] ? lock_acquire+0x1d5/0x580 [ 27.585814] ? lock_acquire+0x1d5/0x580 [ 27.589763] ? __rds_conn_create+0xe46/0x1b50 [ 27.594238] rds_loop_conn_alloc+0xc8/0x380 [ 27.598534] ? rds_loop_conn_free+0x290/0x290 [ 27.603005] ? __init_waitqueue_head+0x97/0x140 [ 27.607657] ? rcutorture_record_progress+0x10/0x10 [ 27.612648] ? __lockdep_init_map+0xe4/0x650 [ 27.617052] __rds_conn_create+0x112f/0x1b50 [ 27.621478] ? rds_conn_drop+0xb0/0xb0 [ 27.625347] ? __raw_spin_lock_init+0x1c/0x100 [ 27.629905] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.634902] ? __lockdep_init_map+0xe4/0x650 [ 27.639286] ? lockdep_init_map+0x9/0x10 [ 27.643321] ? __init_waitqueue_head+0x97/0x140 [ 27.647965] ? init_wait_entry+0x1b0/0x1b0 [ 27.652189] ? lockdep_init_map+0x9/0x10 [ 27.656228] ? rds_message_alloc+0x28c/0x330 [ 27.660612] ? rds_message_next_extension+0x210/0x210 [ 27.665773] ? trace_hardirqs_on+0xd/0x10 [ 27.669897] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.674290] ? __release_sock+0x360/0x360 [ 27.678415] ? lock_sock_nested+0x91/0x110 [ 27.682630] rds_conn_create_outgoing+0x3f/0x50 [ 27.687275] rds_sendmsg+0xda3/0x2390 [ 27.691055] ? avc_has_perm+0x43e/0x680 [ 27.695026] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.699499] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.703970] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.708965] ? find_held_lock+0x35/0x1d0 [ 27.713032] ? sock_has_perm+0x2a4/0x420 [ 27.717080] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.722423] ? lock_release+0xa22/0xa40 [ 27.726370] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.732228] ? __check_object_size+0x8b/0x530 [ 27.736701] ? __might_sleep+0x95/0x190 [ 27.740661] ? selinux_socket_sendmsg+0x36/0x40 [ 27.745306] ? security_socket_sendmsg+0x89/0xb0 [ 27.750043] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.754515] sock_sendmsg+0xca/0x110 [ 27.758204] SYSC_sendto+0x361/0x5c0 [ 27.761896] ? SYSC_connect+0x4a0/0x4a0 [ 27.765845] ? find_held_lock+0x35/0x1d0 [ 27.769888] ? lock_downgrade+0x980/0x980 [ 27.774048] ? up_read+0x1a/0x40 [ 27.777390] ? __do_page_fault+0x3d6/0xc90 [ 27.781606] SyS_sendto+0x40/0x50 [ 27.785041] ? SyS_getpeername+0x30/0x30 [ 27.789083] do_fast_syscall_32+0x3ee/0xfa1 [ 27.793394] ? do_int80_syscall_32+0x9d0/0x9d0 [ 27.797951] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.803462] ? syscall_return_slowpath+0x550/0x550 [ 27.808366] ? syscall_return_slowpath+0x2ac/0x550 [ 27.813277] ? retint_user+0x18/0x18 [ 27.816987] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.821818] entry_SYSENTER_compat+0x54/0x63 [ 27.826197] RIP: 0023:0xf7f2ec79 [ 27.829539] RSP: 002b:00000000ffb6d6dc EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 27.837232] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 27.844476] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020062000 [ 27.851716] RBP: 0000000000000010 R0