[....] Starting enhanced syslogd: rsyslogd[ 15.986236] audit: type=1400 audit(1518387016.954:5): avc: denied { syslog } for pid=3976 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: [ 19.058326] audit: type=1400 audit(1518387020.025:6): avc: denied { map } for pid=4115 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 '10.128.15.205' (ECDSA) to the list of known hosts. executing program [ 25.385333] audit: type=1400 audit(1518387026.353:7): avc: denied { map } for pid=4129 comm="syzkaller334771" path="/root/syzkaller334771104" 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 [ 25.413158] [ 25.414847] ============================= [ 25.419027] WARNING: suspicious RCU usage [ 25.423217] 4.15.0+ #308 Not tainted [ 25.426944] ----------------------------- [ 25.431116] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.440387] [ 25.440387] other info that might help us debug this: [ 25.440387] [ 25.448539] [ 25.448539] rcu_scheduler_active = 2, debug_locks = 1 [ 25.455231] 1 lock held by syzkaller334771/4129: [ 25.459996] #0: (rcu_read_lock){....}, at: [<00000000fa007d3c>] __rds_conn_create+0xe46/0x1b50 [ 25.468989] [ 25.468989] stack backtrace: [ 25.473499] CPU: 1 PID: 4129 Comm: syzkaller334771 Not tainted 4.15.0+ #308 [ 25.480574] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.489903] Call Trace: [ 25.492469] dump_stack+0x194/0x257 [ 25.496077] ? arch_local_irq_restore+0x53/0x53 [ 25.500744] lockdep_rcu_suspicious+0x123/0x170 [ 25.505392] ___might_sleep+0x385/0x470 [ 25.509342] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.515208] ? __debug_object_init+0x235/0x1040 [ 25.519854] ? debug_mutex_init+0x1c/0x60 [ 25.523981] __might_sleep+0x95/0x190 [ 25.527761] kmem_cache_alloc_trace+0x299/0x740 [ 25.532412] ? lock_acquire+0x1d5/0x580 [ 25.536361] ? lock_acquire+0x1d5/0x580 [ 25.540312] ? __rds_conn_create+0xe46/0x1b50 [ 25.544788] rds_loop_conn_alloc+0xc8/0x380 [ 25.549085] ? rds_loop_conn_free+0x290/0x290 [ 25.553555] ? __init_waitqueue_head+0x97/0x140 [ 25.558205] ? rcutorture_record_progress+0x10/0x10 [ 25.563211] ? __lockdep_init_map+0xe4/0x650 [ 25.567597] __rds_conn_create+0x112f/0x1b50 [ 25.571998] ? rds_conn_drop+0xb0/0xb0 [ 25.575869] ? __raw_spin_lock_init+0x1c/0x100 [ 25.580426] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.585423] ? __lockdep_init_map+0xe4/0x650 [ 25.589817] ? lockdep_init_map+0x9/0x10 [ 25.593854] ? __init_waitqueue_head+0x97/0x140 [ 25.598505] ? init_wait_entry+0x1b0/0x1b0 [ 25.602893] ? lockdep_init_map+0x9/0x10 [ 25.606933] ? rds_message_alloc+0x28c/0x330 [ 25.611313] ? rds_message_next_extension+0x210/0x210 [ 25.616473] ? trace_hardirqs_on+0xd/0x10 [ 25.620597] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.624982] ? __release_sock+0x360/0x360 [ 25.629101] ? lock_sock_nested+0x91/0x110 [ 25.633311] rds_conn_create_outgoing+0x3f/0x50 [ 25.637957] rds_sendmsg+0xda3/0x2390 [ 25.641728] ? avc_has_perm+0x43e/0x680 [ 25.645700] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.650176] ? lock_downgrade+0x980/0x980 [ 25.654303] ? rw_copy_check_uvector+0x1be/0x280 [ 25.659055] ? sock_has_perm+0x2a4/0x420 [ 25.663103] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.668439] ? dup_iter+0x172/0x260 [ 25.672043] ? kasan_check_write+0x14/0x20 [ 25.676257] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.680985] ? check_noncircular+0x20/0x20 [ 25.685198] ? selinux_socket_sendmsg+0x36/0x40 [ 25.689840] ? security_socket_sendmsg+0x89/0xb0 [ 25.694569] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.699046] sock_sendmsg+0xca/0x110 [ 25.702742] ___sys_sendmsg+0x767/0x8b0 [ 25.706697] ? copy_msghdr_from_user+0x590/0x590 [ 25.711432] ? __pmd_alloc+0x4e0/0x4e0 [ 25.715302] ? check_noncircular+0x20/0x20 [ 25.719509] ? lock_release+0xa40/0xa40 [ 25.723455] ? lock_acquire+0x1d5/0x580 [ 25.727407] ? check_noncircular+0x20/0x20 [ 25.731617] ? find_held_lock+0x35/0x1d0 [ 25.736698] ? __fget_light+0x2b2/0x3c0 [ 25.740647] ? fget_raw+0x20/0x20 [ 25.744506] ? handle_mm_fault+0x270/0x970 [ 25.748719] ? find_held_lock+0x35/0x1d0 [ 25.752780] ? __do_page_fault+0x5f7/0xc90 [ 25.756991] ? lock_downgrade+0x980/0x980 [ 25.761126] __sys_sendmsg+0xe5/0x210 [ 25.764910] ? __sys_sendmsg+0xe5/0x210 [ 25.768857] ? SyS_shutdown+0x290/0x290 [ 25.772813] ? __do_page_fault+0x3d6/0xc90 [ 25.777031] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.782551] SyS_sendmsg+0x2d/0x50 [ 25.786064] ? __sys_sendmsg+0x210/0x210 [ 25.790097] do_syscall_64+0x282/0x940 [ 25.793959] ? __do_page_fault+0xc90/0xc90 [ 25.798170] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.802902] ? syscall_return_slowpath+0x550/0x550 [ 25.807817] ? syscall_return_slowpath+0x2ac/0x550 [ 25.812723] ? prepare_exit_to_usermode+0x350/0x350 [ 25.817714] ? retint_user+0x18/0x18 [ 25.821406] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.826244] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.831416] RIP: 0033:0x43fdf9 [ 25.834580] RSP: 002b:00007ffcdb813618 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 25.842267] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 25.849516] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 25.856763] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 25.864008] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 25.871260] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 25.878585] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.886058] in_atomic(): 1, irqs_disabled(): 0, pid: 4129, name: syzkaller334771 [ 25.893604] 1 lock held by syzkaller334771/4129: [ 25.898375] #0: (rcu_read_lock){....}, at: [<00000000fa007d3c>] __rds_conn_create+0xe46/0x1b50 [ 25.907337] CPU: 1 PID: 4129 Comm: syzkaller334771 Not tainted 4.15.0+ #308 [ 25.914417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.923745] Call Trace: [ 25.926308] dump_stack+0x194/0x257 [ 25.929911] ? arch_local_irq_restore+0x53/0x53 [ 25.934557] ? print_lock+0x9f/0xa2 [ 25.938157] ? lockdep_print_held_locks+0xc4/0x130 [ 25.943070] ___might_sleep+0x2b2/0x470 [ 25.947020] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.952879] ? __debug_object_init+0x235/0x1040 [ 25.957526] ? debug_mutex_init+0x1c/0x60 [ 25.961668] __might_sleep+0x95/0x190 [ 25.965454] kmem_cache_alloc_trace+0x299/0x740 [ 25.970108] ? lock_acquire+0x1d5/0x580 [ 25.974071] ? lock_acquire+0x1d5/0x580 [ 25.978034] ? __rds_conn_create+0xe46/0x1b50 [ 25.982519] rds_loop_conn_alloc+0xc8/0x380 [ 25.986817] ? rds_loop_conn_free+0x290/0x290 [ 25.991290] ? __init_waitqueue_head+0x97/0x140 [ 25.996027] ? rcutorture_record_progress+0x10/0x10 [ 26.001016] ? __lockdep_init_map+0xe4/0x650 [ 26.005405] __rds_conn_create+0x112f/0x1b50 [ 26.009810] ? rds_conn_drop+0xb0/0xb0 [ 26.013685] ? __raw_spin_lock_init+0x1c/0x100 [ 26.018243] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.023256] ? __lockdep_init_map+0xe4/0x650 [ 26.027644] ? lockdep_init_map+0x9/0x10 [ 26.031703] ? __init_waitqueue_head+0x97/0x140 [ 26.036355] ? init_wait_entry+0x1b0/0x1b0 [ 26.040571] ? lockdep_init_map+0x9/0x10 [ 26.044610] ? rds_message_alloc+0x28c/0x330 [ 26.048993] ? rds_message_next_extension+0x210/0x210 [ 26.054162] ? trace_hardirqs_on+0xd/0x10 [ 26.058288] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.062678] ? __release_sock+0x360/0x360 [ 26.066817] ? lock_sock_nested+0x91/0x110 [ 26.071030] rds_conn_create_outgoing+0x3f/0x50 [ 26.075676] rds_sendmsg+0xda3/0x2390 [ 26.079451] ? avc_has_perm+0x43e/0x680 [ 26.083416] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.087892] ? lock_downgrade+0x980/0x980 [ 26.092019] ? rw_copy_check_uvector+0x1be/0x280 [ 26.096756] ? sock_has_perm+0x2a4/0x420 [ 26.100792] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.106128] ? dup_iter+0x172/0x260 [ 26.109732] ? kasan_check_write+0x14/0x20 [ 26.113945] ? copy_msghdr_from_user+0x3a6/0x590 [ 26.118673] ? check_noncircular+0x20/0x20 [ 26.122887] ? selinux_socket_sendmsg+0x36/0x40 [ 26.127529] ? security_socket_sendmsg+0x89/0xb0 [ 26.132256] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.136735] sock_sendmsg+0xca/0x110 [ 26.140424] ___sys_sendmsg+0x767/0x8b0 [ 26.144375] ? copy_msghdr_from_user+0x590/0x590 [ 26.149109] ? __pmd_alloc+0x4e0/0x4e0 [ 26.152967] ? check_noncircular+0x20/0x20 [ 26.157180] ? lock_release+0xa40/0xa40 [ 26.161126] ? lock_acquire+0x1d5/0x580 [ 26.165073] ? check_noncircular+0x20/0x20 [ 26.169283] ? find_held_lock+0x35/0x1d0 [ 26.173326] ? __fget_light+0x2b2/0x3c0 [ 26.177274] ? fget_raw+0x20/0x20 [ 26.180698] ? handle_mm_fault+0x270/0x970 [ 26.184907] ? find_held_lock+0x35/0x1d0 [ 26.188963] ? __do_page_fault+0x5f7/0xc90 [ 26.193172] ? lock_downgrade+0x980/0x980 [ 26.197302] __sys_sendmsg+0xe5/0x210 [ 26.201074] ? __sys_sendmsg+0xe5/0x210 [ 26.205032] ? SyS_shutdown+0x290/0x290 [ 26.208991] ? __do_page_fault+0x3d6/0xc90 [ 26.213216] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.218732] SyS_sendmsg+0x2d/0x50 [ 26.222247] ? __sys_sendmsg+0x210/0x210 [ 26.226283] do_syscall_64+0x282/0x940 [ 26.230144] ? __do_page_fault+0xc90/0xc90 [ 26.234350] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.239084] ? syscall_return_slowpath+0x550/0x550 [ 26.243987] ? syscall_return_slowpath+0x2ac/0x550 [ 26.248891] ? prepare_exit_to_usermode+0x350/0x350 [ 26.253883] ? retint_user+0x18/0x18 [ 26.257578] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.262402] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.267561] RIP: 0033:0x43fdf9 [ 26.270728] RSP: 002b:00007ffcdb813618 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.278412] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 26.285655] RDX: 0000000000000000 RSI: 00