[....] Starting enhanced syslogd: rsyslogd[ 16.495188] audit: type=1400 audit(1518300678.994:5): avc: denied { syslog } for pid=4013 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.635635] audit: type=1400 audit(1518300685.134:6): avc: denied { map } for pid=4153 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 '10.128.15.222' (ECDSA) to the list of known hosts. executing program [ 28.934787] audit: type=1400 audit(1518300691.433:7): avc: denied { map } for pid=4167 comm="syzkaller969271" path="/root/syzkaller969271929" 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 [ 28.962765] [ 28.964450] ============================= [ 28.968607] WARNING: suspicious RCU usage [ 28.972763] 4.15.0+ #217 Not tainted [ 28.976478] ----------------------------- [ 28.980640] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.989911] [ 28.989911] other info that might help us debug this: [ 28.989911] [ 28.998062] [ 28.998062] rcu_scheduler_active = 2, debug_locks = 1 [ 29.004736] 1 lock held by syzkaller969271/4167: [ 29.009488] #0: (rcu_read_lock){....}, at: [<0000000045ad123a>] __rds_conn_create+0xe46/0x1b50 [ 29.018433] [ 29.018433] stack backtrace: [ 29.022942] CPU: 1 PID: 4167 Comm: syzkaller969271 Not tainted 4.15.0+ #217 [ 29.030017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.039338] Call Trace: [ 29.041897] dump_stack+0x194/0x257 [ 29.045501] ? arch_local_irq_restore+0x53/0x53 [ 29.050163] lockdep_rcu_suspicious+0x123/0x170 [ 29.054806] ___might_sleep+0x385/0x470 [ 29.058752] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.064615] ? __debug_object_init+0x235/0x1040 [ 29.069258] ? lock_acquire+0x1d5/0x580 [ 29.073208] ? debug_mutex_init+0x1c/0x60 [ 29.077331] __might_sleep+0x95/0x190 [ 29.081107] kmem_cache_alloc_trace+0x299/0x740 [ 29.085749] ? lock_acquire+0x1d5/0x580 [ 29.089695] ? lock_acquire+0x1d5/0x580 [ 29.093642] ? __rds_conn_create+0xe46/0x1b50 [ 29.098111] rds_loop_conn_alloc+0xc8/0x380 [ 29.102404] ? rds_loop_conn_free+0x290/0x290 [ 29.106878] ? __init_waitqueue_head+0x97/0x140 [ 29.111521] ? rcutorture_record_progress+0x10/0x10 [ 29.116510] ? __lockdep_init_map+0xe4/0x650 [ 29.120897] __rds_conn_create+0x112f/0x1b50 [ 29.125295] ? rds_conn_drop+0xb0/0xb0 [ 29.129152] ? find_held_lock+0x35/0x1d0 [ 29.133194] ? __might_fault+0x110/0x1d0 [ 29.137241] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.143099] ? free_unref_page+0x9e0/0x9e0 [ 29.147310] ? rcu_note_context_switch+0x710/0x710 [ 29.152215] ? kasan_check_write+0x14/0x20 [ 29.156420] ? copyin+0x91/0xb0 [ 29.159670] ? copy_page_from_iter+0x50e/0x7c0 [ 29.164230] ? _copy_from_iter+0xf30/0xf30 [ 29.168447] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.172835] ? rds_message_copy_from_user+0x29e/0x370 [ 29.178001] rds_conn_create_outgoing+0x3f/0x50 [ 29.182646] rds_sendmsg+0xda3/0x2390 [ 29.186419] ? avc_has_perm+0x43e/0x680 [ 29.190379] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.194848] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.199318] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.204308] ? find_held_lock+0x35/0x1d0 [ 29.208351] ? sock_has_perm+0x2a4/0x420 [ 29.212389] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.217732] ? lock_release+0xa02/0xa40 [ 29.221681] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.227540] ? __check_object_size+0x8b/0x530 [ 29.232022] ? __might_sleep+0x95/0x190 [ 29.235983] ? selinux_socket_sendmsg+0x36/0x40 [ 29.240624] ? security_socket_sendmsg+0x89/0xb0 [ 29.245354] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.249825] sock_sendmsg+0xca/0x110 [ 29.253528] SYSC_sendto+0x361/0x5c0 [ 29.257216] ? SYSC_connect+0x4a0/0x4a0 [ 29.261165] ? find_held_lock+0x35/0x1d0 [ 29.265211] ? lock_downgrade+0x980/0x980 [ 29.269353] ? up_read+0x1a/0x40 [ 29.272691] ? __do_page_fault+0x3d6/0xc90 [ 29.276911] SyS_sendto+0x40/0x50 [ 29.280336] ? SyS_getpeername+0x30/0x30 [ 29.284369] do_fast_syscall_32+0x3ee/0xfa1 [ 29.288668] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.293224] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.297951] ? syscall_return_slowpath+0x550/0x550 [ 29.302853] ? syscall_return_slowpath+0x2ac/0x550 [ 29.307756] ? prepare_exit_to_usermode+0x350/0x350 [ 29.312747] ? retint_user+0x18/0x18 [ 29.316437] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.321260] entry_SYSENTER_compat+0x54/0x63 [ 29.325638] RIP: 0023:0xf7f53c79 [ 29.328971] RSP: 002b:00000000ffe60a2c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 29.336652] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204b3fff [ 29.343891] RDX: 000000000000fffa RSI: 0000000000000000 RDI: 00000000202b4000 [ 29.351133] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 29.358373] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 29.365612] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 29.372993] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.380447] in_atomic(): 1, irqs_disabled(): 0, pid: 4167, name: syzkaller969271 [ 29.388007] 1 lock held by syzkaller969271/4167: [ 29.392781] #0: (rcu_read_lock){....}, at: [<0000000045ad123a>] __rds_conn_create+0xe46/0x1b50 [ 29.401731] CPU: 1 PID: 4167 Comm: syzkaller969271 Not tainted 4.15.0+ #217 [ 29.408817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.418141] Call Trace: [ 29.420701] dump_stack+0x194/0x257 [ 29.424306] ? arch_local_irq_restore+0x53/0x53 [ 29.428954] ? print_lock+0x9f/0xa2 [ 29.432553] ? lockdep_print_held_locks+0xc4/0x130 [ 29.437458] ___might_sleep+0x2b2/0x470 [ 29.441402] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.447257] ? __debug_object_init+0x235/0x1040 [ 29.451894] ? lock_acquire+0x1d5/0x580 [ 29.455839] ? debug_mutex_init+0x1c/0x60 [ 29.459961] __might_sleep+0x95/0x190 [ 29.463742] kmem_cache_alloc_trace+0x299/0x740 [ 29.468387] ? lock_acquire+0x1d5/0x580 [ 29.472332] ? lock_acquire+0x1d5/0x580 [ 29.476276] ? __rds_conn_create+0xe46/0x1b50 [ 29.480752] rds_loop_conn_alloc+0xc8/0x380 [ 29.485048] ? rds_loop_conn_free+0x290/0x290 [ 29.489516] ? __init_waitqueue_head+0x97/0x140 [ 29.494169] ? rcutorture_record_progress+0x10/0x10 [ 29.499163] ? __lockdep_init_map+0xe4/0x650 [ 29.503548] __rds_conn_create+0x112f/0x1b50 [ 29.507945] ? rds_conn_drop+0xb0/0xb0 [ 29.511803] ? find_held_lock+0x35/0x1d0 [ 29.515842] ? __might_fault+0x110/0x1d0 [ 29.519889] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.525744] ? free_unref_page+0x9e0/0x9e0 [ 29.529953] ? rcu_note_context_switch+0x710/0x710 [ 29.534860] ? kasan_check_write+0x14/0x20 [ 29.539066] ? copyin+0x91/0xb0 [ 29.542321] ? copy_page_from_iter+0x50e/0x7c0 [ 29.546880] ? _copy_from_iter+0xf30/0xf30 [ 29.551093] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.555478] ? rds_message_copy_from_user+0x29e/0x370 [ 29.560643] rds_conn_create_outgoing+0x3f/0x50 [ 29.565288] rds_sendmsg+0xda3/0x2390 [ 29.569064] ? avc_has_perm+0x43e/0x680 [ 29.573028] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.577495] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.581963] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.586954] ? find_held_lock+0x35/0x1d0 [ 29.591256] ? sock_has_perm+0x2a4/0x420 [ 29.595293] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.600629] ? lock_release+0xa02/0xa40 [ 29.604577] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.610432] ? __check_object_size+0x8b/0x530 [ 29.614904] ? __might_sleep+0x95/0x190 [ 29.618855] ? selinux_socket_sendmsg+0x36/0x40 [ 29.623501] ? security_socket_sendmsg+0x89/0xb0 [ 29.628233] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.632704] sock_sendmsg+0xca/0x110 [ 29.636392] SYSC_sendto+0x361/0x5c0 [ 29.640095] ? SYSC_connect+0x4a0/0x4a0 [ 29.644062] ? find_held_lock+0x35/0x1d0 [ 29.648116] ? lock_downgrade+0x980/0x980 [ 29.652257] ? up_read+0x1a/0x40 [ 29.655595] ? __do_page_fault+0x3d6/0xc90 [ 29.659810] SyS_sendto+0x40/0x50 [ 29.663241] ? SyS_getpeername+0x30/0x30 [ 29.667284] do_fast_syscall_32+0x3ee/0xfa1 [ 29.671582] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.676138] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.680867] ? syscall_return_slowpath+0x550/0x550 [ 29.685769] ? syscall_return_slowpath+0x2ac/0x550 [ 29.690672] ? prepare_exit_to_usermode+0x350/0x350 [ 29.695658] ? retint_user+0x18/0x18 [ 29.699351] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.704171] entry_SYSENTER_compat+0x54/0x63 [ 29.708549] RIP: 0023:0xf7f53c79 [ 29.711882] RSP: 002b:00000000ffe60a2c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 29.719559] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204b3fff [ 29.726799] RDX: 000000000000fffa RSI: 0000000000000000 RDI: 00000000202b4000 [ 29.734042] RBP: 0000000000000010 R08: 00000000