[....] Starting enhanced syslogd: rsyslogd[ 16.247287] audit: type=1400 audit(1518318912.003:5): avc: denied { syslog } for pid=4008 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: [ 22.079589] audit: type=1400 audit(1518318917.835:6): avc: denied { map } for pid=4148 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 [ 28.372901] audit: type=1400 audit(1518318924.128:7): avc: denied { map } for pid=4162 comm="syzkaller542253" path="/root/syzkaller542253518" 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 [ 28.400073] [ 28.401857] ============================= [ 28.406038] WARNING: suspicious RCU usage [ 28.410192] 4.15.0+ #218 Not tainted [ 28.413910] ----------------------------- [ 28.418075] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.427355] [ 28.427355] other info that might help us debug this: [ 28.427355] [ 28.435526] [ 28.435526] rcu_scheduler_active = 2, debug_locks = 1 [ 28.442214] 1 lock held by syzkaller542253/4162: [ 28.446979] #0: (rcu_read_lock){....}, at: [<0000000068c24cea>] __rds_conn_create+0xe46/0x1b50 [ 28.455972] [ 28.455972] stack backtrace: [ 28.460483] CPU: 1 PID: 4162 Comm: syzkaller542253 Not tainted 4.15.0+ #218 [ 28.467565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.476896] Call Trace: [ 28.479467] dump_stack+0x194/0x257 [ 28.483081] ? arch_local_irq_restore+0x53/0x53 [ 28.487749] lockdep_rcu_suspicious+0x123/0x170 [ 28.492418] ___might_sleep+0x385/0x470 [ 28.496387] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.502260] ? __debug_object_init+0x235/0x1040 [ 28.506919] ? debug_mutex_init+0x1c/0x60 [ 28.511057] __might_sleep+0x95/0x190 [ 28.514845] kmem_cache_alloc_trace+0x299/0x740 [ 28.519506] ? lock_acquire+0x1d5/0x580 [ 28.523456] ? lock_acquire+0x1d5/0x580 [ 28.527405] ? __rds_conn_create+0xe46/0x1b50 [ 28.531877] rds_loop_conn_alloc+0xc8/0x380 [ 28.536172] ? rds_loop_conn_free+0x290/0x290 [ 28.540643] ? __init_waitqueue_head+0x97/0x140 [ 28.545289] ? rcutorture_record_progress+0x10/0x10 [ 28.550280] ? __lockdep_init_map+0xe4/0x650 [ 28.554666] __rds_conn_create+0x112f/0x1b50 [ 28.559067] ? rds_conn_drop+0xb0/0xb0 [ 28.562938] ? __raw_spin_lock_init+0x1c/0x100 [ 28.567494] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.572489] ? __lockdep_init_map+0xe4/0x650 [ 28.576871] ? lockdep_init_map+0x9/0x10 [ 28.580920] ? __init_waitqueue_head+0x97/0x140 [ 28.585565] ? init_wait_entry+0x1b0/0x1b0 [ 28.589782] ? lockdep_init_map+0x9/0x10 [ 28.593821] ? rds_message_alloc+0x28c/0x330 [ 28.598203] ? rds_message_next_extension+0x210/0x210 [ 28.603365] ? trace_hardirqs_on+0xd/0x10 [ 28.607499] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.611892] ? __release_sock+0x360/0x360 [ 28.616012] ? lock_sock_nested+0x91/0x110 [ 28.620230] rds_conn_create_outgoing+0x3f/0x50 [ 28.624876] rds_sendmsg+0xda3/0x2390 [ 28.628649] ? avc_has_perm+0x43e/0x680 [ 28.632618] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.637090] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.641562] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.646564] ? find_held_lock+0x35/0x1d0 [ 28.650607] ? sock_has_perm+0x2a4/0x420 [ 28.654644] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.659979] ? lock_release+0xa22/0xa40 [ 28.663927] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.669785] ? __check_object_size+0x8b/0x530 [ 28.674259] ? __might_sleep+0x95/0x190 [ 28.678209] ? selinux_socket_sendmsg+0x36/0x40 [ 28.682851] ? security_socket_sendmsg+0x89/0xb0 [ 28.687579] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.692051] sock_sendmsg+0xca/0x110 [ 28.695741] SYSC_sendto+0x361/0x5c0 [ 28.699433] ? SYSC_connect+0x4a0/0x4a0 [ 28.703383] ? find_held_lock+0x35/0x1d0 [ 28.707429] ? lock_downgrade+0x980/0x980 [ 28.711585] ? up_read+0x1a/0x40 [ 28.714925] ? __do_page_fault+0x3d6/0xc90 [ 28.719141] SyS_sendto+0x40/0x50 [ 28.722571] ? SyS_getpeername+0x30/0x30 [ 28.726606] do_fast_syscall_32+0x3ee/0xfa1 [ 28.730904] ? do_int80_syscall_32+0x9d0/0x9d0 [ 28.735462] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.740190] ? syscall_return_slowpath+0x550/0x550 [ 28.745092] ? syscall_return_slowpath+0x2ac/0x550 [ 28.749995] ? prepare_exit_to_usermode+0x350/0x350 [ 28.754985] ? retint_user+0x18/0x18 [ 28.758676] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.763499] entry_SYSENTER_compat+0x54/0x63 [ 28.767880] RIP: 0023:0xf7f2cc79 [ 28.771213] RSP: 002b:00000000ffeb410c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 28.778897] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 28.786142] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020062000 [ 28.793386] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 28.800630] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 28.807872] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.815178] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 28.822647] in_atomic(): 1, irqs_disabled(): 0, pid: 4162, name: syzkaller542253 [ 28.830198] 1 lock held by syzkaller542253/4162: [ 28.834950] #0: (rcu_read_lock){....}, at: [<0000000068c24cea>] __rds_conn_create+0xe46/0x1b50 [ 28.843906] CPU: 1 PID: 4162 Comm: syzkaller542253 Not tainted 4.15.0+ #218 [ 28.850981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.860310] Call Trace: [ 28.862874] dump_stack+0x194/0x257 [ 28.866478] ? arch_local_irq_restore+0x53/0x53 [ 28.871124] ? print_lock+0x9f/0xa2 [ 28.874727] ? lockdep_print_held_locks+0xc4/0x130 [ 28.879638] ___might_sleep+0x2b2/0x470 [ 28.883586] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.889444] ? __debug_object_init+0x235/0x1040 [ 28.894089] ? debug_mutex_init+0x1c/0x60 [ 28.898215] __might_sleep+0x95/0x190 [ 28.901997] kmem_cache_alloc_trace+0x299/0x740 [ 28.906642] ? lock_acquire+0x1d5/0x580 [ 28.910590] ? lock_acquire+0x1d5/0x580 [ 28.914541] ? __rds_conn_create+0xe46/0x1b50 [ 28.919015] rds_loop_conn_alloc+0xc8/0x380 [ 28.923310] ? rds_loop_conn_free+0x290/0x290 [ 28.927785] ? __init_waitqueue_head+0x97/0x140 [ 28.932434] ? rcutorture_record_progress+0x10/0x10 [ 28.937448] ? __lockdep_init_map+0xe4/0x650 [ 28.941858] __rds_conn_create+0x112f/0x1b50 [ 28.946281] ? rds_conn_drop+0xb0/0xb0 [ 28.950169] ? __raw_spin_lock_init+0x1c/0x100 [ 28.954736] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.959739] ? __lockdep_init_map+0xe4/0x650 [ 28.964124] ? lockdep_init_map+0x9/0x10 [ 28.968157] ? __init_waitqueue_head+0x97/0x140 [ 28.972798] ? init_wait_entry+0x1b0/0x1b0 [ 28.977010] ? lockdep_init_map+0x9/0x10 [ 28.981050] ? rds_message_alloc+0x28c/0x330 [ 28.985434] ? rds_message_next_extension+0x210/0x210 [ 28.990594] ? trace_hardirqs_on+0xd/0x10 [ 28.994718] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.999115] ? __release_sock+0x360/0x360 [ 29.003245] ? lock_sock_nested+0x91/0x110 [ 29.007462] rds_conn_create_outgoing+0x3f/0x50 [ 29.012110] rds_sendmsg+0xda3/0x2390 [ 29.015904] ? avc_has_perm+0x43e/0x680 [ 29.019880] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.024354] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.028824] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.033816] ? find_held_lock+0x35/0x1d0 [ 29.037861] ? sock_has_perm+0x2a4/0x420 [ 29.041907] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.047246] ? lock_release+0xa22/0xa40 [ 29.051192] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.057051] ? __check_object_size+0x8b/0x530 [ 29.061533] ? __might_sleep+0x95/0x190 [ 29.065486] ? selinux_socket_sendmsg+0x36/0x40 [ 29.070132] ? security_socket_sendmsg+0x89/0xb0 [ 29.074861] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.079332] sock_sendmsg+0xca/0x110 [ 29.083019] SYSC_sendto+0x361/0x5c0 [ 29.086708] ? SYSC_connect+0x4a0/0x4a0 [ 29.090662] ? find_held_lock+0x35/0x1d0 [ 29.094705] ? lock_downgrade+0x980/0x980 [ 29.098847] ? up_read+0x1a/0x40 [ 29.102193] ? __do_page_fault+0x3d6/0xc90 [ 29.106410] SyS_sendto+0x40/0x50 [ 29.109834] ? SyS_getpeername+0x30/0x30 [ 29.113872] do_fast_syscall_32+0x3ee/0xfa1 [ 29.118185] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.122743] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.127473] ? syscall_return_slowpath+0x550/0x550 [ 29.132377] ? syscall_return_slowpath+0x2ac/0x550 [ 29.137287] ? prepare_exit_to_usermode+0x350/0x350 [ 29.142283] ? retint_user+0x18/0x18 [ 29.145976] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.150801] entry_SYSENTER_compat+0x54/0x63 [ 29.155187] RIP: 0023:0xf7f2cc79 [ 29.158526] RSP: 002b:00000000ffeb410c EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 29.166205] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 29.173455] RDX: 0000000000000000