[....] Starting enhanced syslogd: rsyslogd[ 15.143973] audit: type=1400 audit(1518324396.221:5): avc: denied { syslog } for pid=3938 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: [ 18.883872] audit: type=1400 audit(1518324399.961:6): avc: denied { map } for pid=4076 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 [ 25.177443] audit: type=1400 audit(1518324406.255:7): avc: denied { map } for pid=4090 comm="syzkaller046137" path="/root/syzkaller046137069" 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 [ 25.205363] [ 25.207063] ============================= [ 25.211214] WARNING: suspicious RCU usage [ 25.215360] 4.15.0+ #218 Not tainted [ 25.219080] ----------------------------- [ 25.223226] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.232493] [ 25.232493] other info that might help us debug this: [ 25.232493] [ 25.240648] [ 25.240648] rcu_scheduler_active = 2, debug_locks = 1 [ 25.247314] 1 lock held by syzkaller046137/4090: [ 25.252068] #0: (rcu_read_lock){....}, at: [<00000000e1b15ad9>] __rds_conn_create+0xe46/0x1b50 [ 25.261026] [ 25.261026] stack backtrace: [ 25.265521] CPU: 1 PID: 4090 Comm: syzkaller046137 Not tainted 4.15.0+ #218 [ 25.272592] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.281916] Call Trace: [ 25.284479] dump_stack+0x194/0x257 [ 25.288081] ? arch_local_irq_restore+0x53/0x53 [ 25.292736] lockdep_rcu_suspicious+0x123/0x170 [ 25.297382] ___might_sleep+0x385/0x470 [ 25.301331] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.307189] ? __debug_object_init+0x235/0x1040 [ 25.311829] ? lock_acquire+0x1d5/0x580 [ 25.315775] ? debug_mutex_init+0x1c/0x60 [ 25.319899] __might_sleep+0x95/0x190 [ 25.323678] kmem_cache_alloc_trace+0x299/0x740 [ 25.328320] ? lock_acquire+0x1d5/0x580 [ 25.332266] ? lock_acquire+0x1d5/0x580 [ 25.336212] ? __rds_conn_create+0xe46/0x1b50 [ 25.340685] rds_loop_conn_alloc+0xc8/0x380 [ 25.344981] ? rds_loop_conn_free+0x290/0x290 [ 25.349452] ? __init_waitqueue_head+0x97/0x140 [ 25.354105] ? rcutorture_record_progress+0x10/0x10 [ 25.359096] ? __lockdep_init_map+0xe4/0x650 [ 25.363485] __rds_conn_create+0x112f/0x1b50 [ 25.367885] ? rds_conn_drop+0xb0/0xb0 [ 25.371747] ? lock_release+0xa40/0xa40 [ 25.375699] ? __raw_spin_lock_init+0x1c/0x100 [ 25.380254] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.385247] ? __lockdep_init_map+0xe4/0x650 [ 25.389632] ? lockdep_init_map+0x9/0x10 [ 25.393665] ? __init_waitqueue_head+0x97/0x140 [ 25.398308] ? init_wait_entry+0x1b0/0x1b0 [ 25.402520] ? lockdep_init_map+0x9/0x10 [ 25.406558] ? rds_message_alloc+0x28c/0x330 [ 25.410939] ? rds_message_next_extension+0x210/0x210 [ 25.416103] ? trace_hardirqs_on+0xd/0x10 [ 25.420227] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.424613] ? __release_sock+0x360/0x360 [ 25.428732] ? lock_sock_nested+0x91/0x110 [ 25.432942] rds_conn_create_outgoing+0x3f/0x50 [ 25.437589] rds_sendmsg+0xda3/0x2390 [ 25.441376] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.445847] ? find_held_lock+0x35/0x1d0 [ 25.449889] ? __might_fault+0x110/0x1d0 [ 25.453922] ? lock_downgrade+0x980/0x980 [ 25.458051] ? sock_has_perm+0x2a4/0x420 [ 25.462092] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.467430] ? __might_sleep+0x95/0x190 [ 25.471384] ? kasan_check_write+0x14/0x20 [ 25.475592] ? _copy_from_user+0x99/0x110 [ 25.479718] ? selinux_socket_sendmsg+0x36/0x40 [ 25.484359] ? security_socket_sendmsg+0x89/0xb0 [ 25.489092] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.493562] sock_sendmsg+0xca/0x110 [ 25.497250] ___sys_sendmsg+0x320/0x8b0 [ 25.501201] ? copy_msghdr_from_user+0x590/0x590 [ 25.505929] ? finish_task_switch+0x29b/0x890 [ 25.510400] ? copy_overflow+0x20/0x20 [ 25.514269] ? __fget_light+0x2b2/0x3c0 [ 25.518231] ? __pmd_alloc+0x4e0/0x4e0 [ 25.522093] ? check_noncircular+0x20/0x20 [ 25.526304] ? __fdget+0x18/0x20 [ 25.529647] __sys_sendmmsg+0x31b/0x620 [ 25.533594] ? __sys_sendmmsg+0x31b/0x620 [ 25.537722] ? SyS_sendmsg+0x50/0x50 [ 25.541412] ? __do_page_fault+0x5f7/0xc90 [ 25.545618] ? lock_downgrade+0x980/0x980 [ 25.549752] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.554305] ? vmacache_find+0x5f/0x280 [ 25.558259] ? up_read+0x1a/0x40 [ 25.561606] ? __do_page_fault+0x3d6/0xc90 [ 25.565824] compat_SyS_sendmmsg+0x32/0x40 [ 25.570041] ? compat_SyS_sendmsg+0x40/0x40 [ 25.574336] do_fast_syscall_32+0x3ee/0xfa1 [ 25.578634] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.583188] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.587916] ? syscall_return_slowpath+0x550/0x550 [ 25.592820] ? syscall_return_slowpath+0x2ac/0x550 [ 25.597724] ? prepare_exit_to_usermode+0x350/0x350 [ 25.602714] ? retint_user+0x18/0x18 [ 25.606404] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.611225] entry_SYSENTER_compat+0x54/0x63 [ 25.615604] RIP: 0023:0xf7f91c79 [ 25.618938] RSP: 002b:00000000ffccf9ac EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 25.626615] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020573000 [ 25.633853] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000015 [ 25.641093] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 [ 25.648335] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.655574] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.662898] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.670347] in_atomic(): 1, irqs_disabled(): 0, pid: 4090, name: syzkaller046137 [ 25.677882] 1 lock held by syzkaller046137/4090: [ 25.682628] #0: (rcu_read_lock){....}, at: [<00000000e1b15ad9>] __rds_conn_create+0xe46/0x1b50 [ 25.691573] CPU: 1 PID: 4090 Comm: syzkaller046137 Not tainted 4.15.0+ #218 [ 25.698887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.708211] Call Trace: [ 25.710772] dump_stack+0x194/0x257 [ 25.714379] ? arch_local_irq_restore+0x53/0x53 [ 25.719028] ? print_lock+0x9f/0xa2 [ 25.722635] ? lockdep_print_held_locks+0xc4/0x130 [ 25.727542] ___might_sleep+0x2b2/0x470 [ 25.731489] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.737346] ? __debug_object_init+0x235/0x1040 [ 25.741984] ? lock_acquire+0x1d5/0x580 [ 25.745930] ? debug_mutex_init+0x1c/0x60 [ 25.750057] __might_sleep+0x95/0x190 [ 25.753837] kmem_cache_alloc_trace+0x299/0x740 [ 25.758482] ? lock_acquire+0x1d5/0x580 [ 25.762427] ? lock_acquire+0x1d5/0x580 [ 25.766375] ? __rds_conn_create+0xe46/0x1b50 [ 25.770850] rds_loop_conn_alloc+0xc8/0x380 [ 25.775145] ? rds_loop_conn_free+0x290/0x290 [ 25.779614] ? __init_waitqueue_head+0x97/0x140 [ 25.784259] ? rcutorture_record_progress+0x10/0x10 [ 25.789249] ? __lockdep_init_map+0xe4/0x650 [ 25.793636] __rds_conn_create+0x112f/0x1b50 [ 25.798054] ? rds_conn_drop+0xb0/0xb0 [ 25.801922] ? lock_release+0xa40/0xa40 [ 25.805872] ? __raw_spin_lock_init+0x1c/0x100 [ 25.810427] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.815420] ? __lockdep_init_map+0xe4/0x650 [ 25.819804] ? lockdep_init_map+0x9/0x10 [ 25.823837] ? __init_waitqueue_head+0x97/0x140 [ 25.828479] ? init_wait_entry+0x1b0/0x1b0 [ 25.832692] ? lockdep_init_map+0x9/0x10 [ 25.836730] ? rds_message_alloc+0x28c/0x330 [ 25.841110] ? rds_message_next_extension+0x210/0x210 [ 25.846269] ? trace_hardirqs_on+0xd/0x10 [ 25.850394] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.854780] ? __release_sock+0x360/0x360 [ 25.858896] ? lock_sock_nested+0x91/0x110 [ 25.863109] rds_conn_create_outgoing+0x3f/0x50 [ 25.867758] rds_sendmsg+0xda3/0x2390 [ 25.871548] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.876024] ? find_held_lock+0x35/0x1d0 [ 25.880078] ? __might_fault+0x110/0x1d0 [ 25.884117] ? lock_downgrade+0x980/0x980 [ 25.888246] ? sock_has_perm+0x2a4/0x420 [ 25.892281] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.897620] ? __might_sleep+0x95/0x190 [ 25.901573] ? kasan_check_write+0x14/0x20 [ 25.905781] ? _copy_from_user+0x99/0x110 [ 25.909905] ? selinux_socket_sendmsg+0x36/0x40 [ 25.914546] ? security_socket_sendmsg+0x89/0xb0 [ 25.919276] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.923745] sock_sendmsg+0xca/0x110 [ 25.927437] ___sys_sendmsg+0x320/0x8b0 [ 25.931389] ? copy_msghdr_from_user+0x590/0x590 [ 25.936117] ? finish_task_switch+0x29b/0x890 [ 25.940586] ? copy_overflow+0x20/0x20 [ 25.944456] ? __fget_light+0x2b2/0x3c0 [ 25.948420] ? __pmd_alloc+0x4e0/0x4e0 [ 25.952279] ? check_noncircular+0x20/0x20 [ 25.956493] ? __fdget+0x18/0x20 [ 25.959840] __sys_sendmmsg+0x31b/0x620 [ 25.963783] ? __sys_sendmmsg+0x31b/0x620 [ 25.967909] ? SyS_sendmsg+0x50/0x50 [ 25.971602] ? __do_page_fault+0x5f7/0xc90 [ 25.975811] ? lock_downgrade+0x980/0x980 [ 25.979942] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.984493] ? vmacache_find+0x5f/0x280 [ 25.988446] ? up_read+0x1a/0x40 [ 25.991785] ? __do_page_fault+0x3d6/0xc90 [ 25.996003] compat_SyS_sendmmsg+0x32/0x40 [ 26.000215] ? compat_SyS_sendmsg+0x40/0x40 [ 26.004511] do_fast_syscall_32+0x3ee/0xfa1 [ 26.008810] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.013363] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.018092] ? syscall_return_slowpath+0x550/0x550 [ 26.022994] ? syscall_return_slowpath+0x2ac/0x550 [ 26.027911] ? prepare_exit_to_usermode+0x350/0x350 [ 26.032901] ? retint_user+0x18/0x18 [ 26.036592] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.041414] entry_SYSENTER_compat+0x54/0x63 [ 26.045794] RIP: 0023:0xf7f91c79 [ 26.049128] RSP: 002b:00000000ffccf9ac EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 26.056806] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020573000 [ 26.064052] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000015 [ 26.071293] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 [ 26.078532] R10: 0000000000000000 R