[....] Starting enhanced syslogd: rsyslogd[ 14.977621] audit: type=1400 audit(1518386128.288:5): avc: denied { syslog } for pid=4001 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: [ 19.043604] audit: type=1400 audit(1518386132.354:6): avc: denied { map } for pid=4140 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program [ 27.585940] audit: type=1400 audit(1518386140.896:7): avc: denied { map } for pid=4154 comm="syzkaller645940" path="/root/syzkaller645940013" 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 [ 27.614515] [ 27.616199] ============================= [ 27.620354] WARNING: suspicious RCU usage [ 27.624566] 4.15.0+ #308 Not tainted [ 27.628293] ----------------------------- [ 27.632476] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 27.641747] [ 27.641747] other info that might help us debug this: [ 27.641747] [ 27.649891] [ 27.649891] rcu_scheduler_active = 2, debug_locks = 1 [ 27.656558] 1 lock held by syzkaller645940/4154: [ 27.661313] #0: (rcu_read_lock){....}, at: [<000000007fd4ab0d>] __rds_conn_create+0xe46/0x1b50 [ 27.670257] [ 27.670257] stack backtrace: [ 27.674758] CPU: 1 PID: 4154 Comm: syzkaller645940 Not tainted 4.15.0+ #308 [ 27.681832] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.691157] Call Trace: [ 27.693717] dump_stack+0x194/0x257 [ 27.697318] ? arch_local_irq_restore+0x53/0x53 [ 27.701972] lockdep_rcu_suspicious+0x123/0x170 [ 27.706621] ___might_sleep+0x385/0x470 [ 27.710568] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.716424] ? __debug_object_init+0x235/0x1040 [ 27.721061] ? lock_acquire+0x1d5/0x580 [ 27.725028] ? debug_mutex_init+0x1c/0x60 [ 27.729151] __might_sleep+0x95/0x190 [ 27.732931] kmem_cache_alloc_trace+0x299/0x740 [ 27.737573] ? lock_acquire+0x1d5/0x580 [ 27.741516] ? lock_acquire+0x1d5/0x580 [ 27.745464] ? __rds_conn_create+0xe46/0x1b50 [ 27.749937] rds_loop_conn_alloc+0xc8/0x380 [ 27.754231] ? rds_loop_conn_free+0x290/0x290 [ 27.758698] ? __init_waitqueue_head+0x97/0x140 [ 27.763343] ? rcutorture_record_progress+0x10/0x10 [ 27.768333] ? __lockdep_init_map+0xe4/0x650 [ 27.772717] __rds_conn_create+0x112f/0x1b50 [ 27.777114] ? rds_conn_drop+0xb0/0xb0 [ 27.780987] ? __raw_spin_lock_init+0x1c/0x100 [ 27.785540] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.790532] ? __lockdep_init_map+0xe4/0x650 [ 27.794917] ? lockdep_init_map+0x9/0x10 [ 27.798952] ? __init_waitqueue_head+0x97/0x140 [ 27.803592] ? init_wait_entry+0x1b0/0x1b0 [ 27.807801] ? lockdep_init_map+0x9/0x10 [ 27.811836] ? rds_message_alloc+0x28c/0x330 [ 27.816217] ? rds_message_next_extension+0x210/0x210 [ 27.821377] ? trace_hardirqs_on+0xd/0x10 [ 27.825499] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.829887] ? __release_sock+0x360/0x360 [ 27.834005] ? lock_sock_nested+0x91/0x110 [ 27.838215] rds_conn_create_outgoing+0x3f/0x50 [ 27.842858] rds_sendmsg+0xda3/0x2390 [ 27.846643] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.851109] ? __might_fault+0x110/0x1d0 [ 27.855159] ? lock_release+0xa40/0xa40 [ 27.859107] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.864967] ? find_held_lock+0x35/0x1d0 [ 27.869005] ? sock_has_perm+0x2a4/0x420 [ 27.873038] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.878370] ? lock_downgrade+0x980/0x980 [ 27.882487] ? dup_iter+0x172/0x260 [ 27.886088] ? lock_release+0xa40/0xa40 [ 27.890046] ? selinux_socket_sendmsg+0x36/0x40 [ 27.894689] ? security_socket_sendmsg+0x89/0xb0 [ 27.899419] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.903887] sock_sendmsg+0xca/0x110 [ 27.907576] ___sys_sendmsg+0x320/0x8b0 [ 27.911525] ? copy_msghdr_from_user+0x590/0x590 [ 27.916253] ? finish_task_switch+0x29b/0x890 [ 27.920722] ? copy_overflow+0x20/0x20 [ 27.924590] ? __fget_light+0x2b2/0x3c0 [ 27.928536] ? fget_raw+0x20/0x20 [ 27.931973] ? find_held_lock+0x35/0x1d0 [ 27.936016] ? __fdget+0x18/0x20 [ 27.939370] __sys_sendmmsg+0x1ee/0x620 [ 27.943314] ? __sys_sendmmsg+0x1ee/0x620 [ 27.947442] ? SyS_sendmsg+0x50/0x50 [ 27.951130] ? lock_downgrade+0x980/0x980 [ 27.955261] ? handle_mm_fault+0x43b/0x970 [ 27.959481] ? up_read+0x1a/0x40 [ 27.962821] ? __do_page_fault+0x3d6/0xc90 [ 27.967044] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.972559] SyS_sendmmsg+0x35/0x60 [ 27.976158] ? __sys_sendmmsg+0x620/0x620 [ 27.980278] do_syscall_64+0x282/0x940 [ 27.984137] ? __do_page_fault+0xc90/0xc90 [ 27.988342] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.993073] ? syscall_return_slowpath+0x550/0x550 [ 27.997976] ? syscall_return_slowpath+0x2ac/0x550 [ 28.002878] ? prepare_exit_to_usermode+0x350/0x350 [ 28.007868] ? retint_user+0x18/0x18 [ 28.011557] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.016378] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 28.021539] RIP: 0033:0x43fe29 [ 28.024698] RSP: 002b:00007ffc5ecdf4d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 28.032379] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 28.039621] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 28.046862] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 28.054101] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 28.061344] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 28.068635] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 28.076087] in_atomic(): 1, irqs_disabled(): 0, pid: 4154, name: syzkaller645940 [ 28.083627] 1 lock held by syzkaller645940/4154: [ 28.088381] #0: (rcu_read_lock){....}, at: [<000000007fd4ab0d>] __rds_conn_create+0xe46/0x1b50 [ 28.097330] CPU: 1 PID: 4154 Comm: syzkaller645940 Not tainted 4.15.0+ #308 [ 28.104408] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.113730] Call Trace: [ 28.116289] dump_stack+0x194/0x257 [ 28.119892] ? arch_local_irq_restore+0x53/0x53 [ 28.124533] ? print_lock+0x9f/0xa2 [ 28.128139] ? lockdep_print_held_locks+0xc4/0x130 [ 28.133059] ___might_sleep+0x2b2/0x470 [ 28.137022] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.142884] ? __debug_object_init+0x235/0x1040 [ 28.147524] ? lock_acquire+0x1d5/0x580 [ 28.151470] ? debug_mutex_init+0x1c/0x60 [ 28.155594] __might_sleep+0x95/0x190 [ 28.159373] kmem_cache_alloc_trace+0x299/0x740 [ 28.164016] ? lock_acquire+0x1d5/0x580 [ 28.167960] ? lock_acquire+0x1d5/0x580 [ 28.171906] ? __rds_conn_create+0xe46/0x1b50 [ 28.176377] rds_loop_conn_alloc+0xc8/0x380 [ 28.180672] ? rds_loop_conn_free+0x290/0x290 [ 28.185140] ? __init_waitqueue_head+0x97/0x140 [ 28.189785] ? rcutorture_record_progress+0x10/0x10 [ 28.194773] ? __lockdep_init_map+0xe4/0x650 [ 28.199159] __rds_conn_create+0x112f/0x1b50 [ 28.203566] ? rds_conn_drop+0xb0/0xb0 [ 28.207434] ? __raw_spin_lock_init+0x1c/0x100 [ 28.211988] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.216980] ? __lockdep_init_map+0xe4/0x650 [ 28.221365] ? lockdep_init_map+0x9/0x10 [ 28.225395] ? __init_waitqueue_head+0x97/0x140 [ 28.230037] ? init_wait_entry+0x1b0/0x1b0 [ 28.234255] ? lockdep_init_map+0x9/0x10 [ 28.238292] ? rds_message_alloc+0x28c/0x330 [ 28.242672] ? rds_message_next_extension+0x210/0x210 [ 28.247832] ? trace_hardirqs_on+0xd/0x10 [ 28.251959] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.256344] ? __release_sock+0x360/0x360 [ 28.260460] ? lock_sock_nested+0x91/0x110 [ 28.264669] rds_conn_create_outgoing+0x3f/0x50 [ 28.269312] rds_sendmsg+0xda3/0x2390 [ 28.273109] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.277585] ? __might_fault+0x110/0x1d0 [ 28.281631] ? lock_release+0xa40/0xa40 [ 28.285577] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.291435] ? find_held_lock+0x35/0x1d0 [ 28.295486] ? sock_has_perm+0x2a4/0x420 [ 28.299520] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.304856] ? lock_downgrade+0x980/0x980 [ 28.308977] ? dup_iter+0x172/0x260 [ 28.312579] ? lock_release+0xa40/0xa40 [ 28.316538] ? selinux_socket_sendmsg+0x36/0x40 [ 28.321195] ? security_socket_sendmsg+0x89/0xb0 [ 28.325946] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.330431] sock_sendmsg+0xca/0x110 [ 28.334119] ___sys_sendmsg+0x320/0x8b0 [ 28.338068] ? copy_msghdr_from_user+0x590/0x590 [ 28.342797] ? finish_task_switch+0x29b/0x890 [ 28.347265] ? copy_overflow+0x20/0x20 [ 28.351134] ? __fget_light+0x2b2/0x3c0 [ 28.355081] ? fget_raw+0x20/0x20 [ 28.358522] ? find_held_lock+0x35/0x1d0 [ 28.362560] ? __fdget+0x18/0x20 [ 28.365900] __sys_sendmmsg+0x1ee/0x620 [ 28.369843] ? __sys_sendmmsg+0x1ee/0x620 [ 28.373968] ? SyS_sendmsg+0x50/0x50 [ 28.377654] ? lock_downgrade+0x980/0x980 [ 28.381781] ? handle_mm_fault+0x43b/0x970 [ 28.385998] ? up_read+0x1a/0x40 [ 28.389343] ? __do_page_fault+0x3d6/0xc90 [ 28.393561] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.399076] SyS_sendmmsg+0x35/0x60 [ 28.402676] ? __sys_sendmmsg+0x620/0x620 [ 28.406794] do_syscall_64+0x282/0x940 [ 28.410649] ? __do_page_fault+0xc90/0xc90 [ 28.414853] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.419581] ? syscall_return_slowpath+0x550/0x550 [ 28.424481] ? syscall_return_slowpath+0x2ac/0x550 [ 28.429382] ? prepare_exit_to_usermode+0x350/0x350 [ 28.434369] ? retint_user+0x18/0x18 [ 28.438060] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.442881] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 28.448043] RIP: 0033:0x43fe29 [ 28.451203] RSP: 002b:00007ffc5ecdf4d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 [ 28.458882] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe29 [ 28.466121] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000003 [ 28.473369] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 28.480620] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 28.487863] R13: 000