[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 17.757108] sshd (4043) used greatest stack depth: 16496 bytes left [....] 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: [ 22.510675] audit: type=1400 audit(1518272249.354:6): avc: denied { map } for pid=4151 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 '10.128.0.7' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 28.823771] audit: type=1400 audit(1518272255.667:7): avc: denied { map } for pid=4165 comm="syzkaller447930" path="/root/syzkaller447930684" 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 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 29.234484] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 29.605494] [ 29.607348] ============================= [ 29.611505] WARNING: suspicious RCU usage [ 29.615667] 4.15.0+ #307 Not tainted [ 29.619388] ----------------------------- [ 29.623556] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 29.632848] [ 29.632848] other info that might help us debug this: [ 29.632848] [ 29.641029] [ 29.641029] rcu_scheduler_active = 2, debug_locks = 1 [ 29.647718] 1 lock held by syzkaller447930/4165: [ 29.652479] #0: (rcu_read_lock){....}, at: [<0000000008be5bf3>] __rds_conn_create+0xe46/0x1b50 [ 29.661459] [ 29.661459] stack backtrace: [ 29.665973] CPU: 0 PID: 4165 Comm: syzkaller447930 Not tainted 4.15.0+ #307 [ 29.673052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.682384] Call Trace: [ 29.684956] dump_stack+0x194/0x257 [ 29.688563] ? arch_local_irq_restore+0x53/0x53 [ 29.693222] lockdep_rcu_suspicious+0x123/0x170 [ 29.697872] ___might_sleep+0x385/0x470 [ 29.701825] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.707684] ? debug_mutex_init+0x1c/0x60 [ 29.711809] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.716817] __might_sleep+0x95/0x190 [ 29.720618] kmem_cache_alloc+0x2a2/0x760 [ 29.724743] ? lock_acquire+0x1d5/0x580 [ 29.728713] ? __rds_conn_create+0xe46/0x1b50 [ 29.733201] ? SyS_membarrier+0x700/0x700 [ 29.737337] ? init_timer_key+0x163/0x3f0 [ 29.741467] rds_tcp_conn_alloc+0xa7/0x4e0 [ 29.745685] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 29.750070] ? rds_cmsg_atomic+0xff0/0xff0 [ 29.754287] ? __lockdep_init_map+0xe4/0x650 [ 29.758673] ? rds_cmsg_atomic+0xff0/0xff0 [ 29.762884] __rds_conn_create+0x112f/0x1b50 [ 29.767287] ? rds_conn_drop+0xb0/0xb0 [ 29.771160] ? __raw_spin_lock_init+0x1c/0x100 [ 29.775720] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.780714] ? __lockdep_init_map+0xe4/0x650 [ 29.785102] ? lockdep_init_map+0x9/0x10 [ 29.789138] ? __init_waitqueue_head+0x97/0x140 [ 29.793782] ? init_wait_entry+0x1b0/0x1b0 [ 29.797998] ? lockdep_init_map+0x9/0x10 [ 29.802051] ? rds_message_alloc+0x28c/0x330 [ 29.806437] ? rds_message_next_extension+0x210/0x210 [ 29.811603] ? trace_hardirqs_on+0xd/0x10 [ 29.815731] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.820120] ? __release_sock+0x360/0x360 [ 29.824239] ? lock_sock_nested+0x91/0x110 [ 29.828455] rds_conn_create_outgoing+0x3f/0x50 [ 29.833105] rds_sendmsg+0xda3/0x2390 [ 29.836884] ? avc_has_perm+0x43e/0x680 [ 29.840848] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.845330] ? release_sock+0x1d4/0x2a0 [ 29.849283] ? lock_downgrade+0x980/0x980 [ 29.853410] ? find_held_lock+0x35/0x1d0 [ 29.857456] ? sock_has_perm+0x2a4/0x420 [ 29.861494] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.866848] ? lock_release+0xa02/0xa40 [ 29.870802] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.876664] ? __check_object_size+0x8b/0x530 [ 29.881151] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.885632] ? __might_sleep+0x95/0x190 [ 29.889590] ? selinux_socket_sendmsg+0x36/0x40 [ 29.894236] ? security_socket_sendmsg+0x89/0xb0 [ 29.898970] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.903455] sock_sendmsg+0xca/0x110 [ 29.907148] SYSC_sendto+0x361/0x5c0 [ 29.910839] ? SYSC_connect+0x4a0/0x4a0 [ 29.914796] ? __do_page_fault+0x5f7/0xc90 [ 29.919008] ? lock_downgrade+0x980/0x980 [ 29.923146] ? handle_mm_fault+0x43b/0x970 [ 29.927367] ? up_read+0x1a/0x40 [ 29.930711] ? __do_page_fault+0x3d6/0xc90 [ 29.934949] ? mm_fault_error+0x2c0/0x2c0 [ 29.939075] ? move_addr_to_kernel+0x60/0x60 [ 29.943463] SyS_sendto+0x40/0x50 [ 29.946893] ? SyS_getpeername+0x30/0x30 [ 29.950931] do_syscall_64+0x282/0x940 [ 29.954792] ? __do_page_fault+0xc90/0xc90 [ 29.959001] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.963742] ? syscall_return_slowpath+0x550/0x550 [ 29.968649] ? syscall_return_slowpath+0x2ac/0x550 [ 29.973556] ? prepare_exit_to_usermode+0x350/0x350 [ 29.978558] ? retint_user+0x18/0x18 [ 29.982256] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.987082] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.992247] RIP: 0033:0x445319 [ 29.995411] RSP: 002b:00007ffc40e94df8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 30.003095] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445319 [ 30.010340] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000004 [ 30.017592] RBP: 00007ffc40e94f18 R08: 000000002069affb R09: 0000000000000010 [ 30.024838] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffc40e94f18 [ 30.032084] R13: 00000000004027e0 R14: 0000000000000000 R15: 0000000000000000 [ 30.039856] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 30.047329] in_atomic(): 1, irqs_disabled(): 0, pid: 4165, name: syzkaller447930 [ 30.054878] 1 lock held by syzkaller447930/4165: [ 30.059641] #0: (rcu_read_lock){....}, at: [<0000000008be5bf3>] __rds_conn_create+0xe46/0x1b50 [ 30.068617] CPU: 0 PID: 4165 Comm: syzkaller447930 Not tainted 4.15.0+ #307 [ 30.075703] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.085041] Call Trace: [ 30.087622] dump_stack+0x194/0x257 [ 30.091230] ? arch_local_irq_restore+0x53/0x53 [ 30.095880] ? print_lock+0x9f/0xa2 [ 30.099484] ? lockdep_print_held_locks+0xc4/0x130 [ 30.104396] ___might_sleep+0x2b2/0x470 [ 30.108348] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 30.114213] ? debug_mutex_init+0x1c/0x60 [ 30.118342] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.123357] __might_sleep+0x95/0x190 [ 30.127142] kmem_cache_alloc+0x2a2/0x760 [ 30.131267] ? lock_acquire+0x1d5/0x580 [ 30.135224] ? __rds_conn_create+0xe46/0x1b50 [ 30.139705] ? SyS_membarrier+0x700/0x700 [ 30.143829] ? init_timer_key+0x163/0x3f0 [ 30.147957] rds_tcp_conn_alloc+0xa7/0x4e0 [ 30.152174] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 30.156566] ? rds_cmsg_atomic+0xff0/0xff0 [ 30.160786] ? __lockdep_init_map+0xe4/0x650 [ 30.165171] ? rds_cmsg_atomic+0xff0/0xff0 [ 30.169388] __rds_conn_create+0x112f/0x1b50 [ 30.173810] ? rds_conn_drop+0xb0/0xb0 [ 30.177686] ? __raw_spin_lock_init+0x1c/0x100 [ 30.182248] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.187248] ? __lockdep_init_map+0xe4/0x650 [ 30.191646] ? lockdep_init_map+0x9/0x10 [ 30.195687] ? __init_waitqueue_head+0x97/0x140 [ 30.200336] ? init_wait_entry+0x1b0/0x1b0 [ 30.204554] ? lockdep_init_map+0x9/0x10 [ 30.208595] ? rds_message_alloc+0x28c/0x330 [ 30.212982] ? rds_message_next_extension+0x210/0x210 [ 30.218149] ? trace_hardirqs_on+0xd/0x10 [ 30.222277] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.226665] ? __release_sock+0x360/0x360 [ 30.230789] ? lock_sock_nested+0x91/0x110 [ 30.235010] rds_conn_create_outgoing+0x3f/0x50 [ 30.239682] rds_sendmsg+0xda3/0x2390 [ 30.243464] ? avc_has_perm+0x43e/0x680 [ 30.247432] ? rds_send_drop_to+0x19d0/0x19d0 [ 30.251907] ? release_sock+0x1d4/0x2a0 [ 30.255863] ? lock_downgrade+0x980/0x980 [ 30.259990] ? find_held_lock+0x35/0x1d0 [ 30.264057] ? sock_has_perm+0x2a4/0x420 [ 30.268111] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 30.273451] ? lock_release+0xa02/0xa40 [ 30.277406] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 30.283273] ? __check_object_size+0x8b/0x530 [ 30.287746] ? __handle_mm_fault+0x80e/0x3ce0 [ 30.292230] ? __might_sleep+0x95/0x190 [ 30.296191] ? selinux_socket_sendmsg+0x36/0x40 [ 30.300842] ? security_socket_sendmsg+0x89/0xb0 [ 30.305592] ? rds_send_drop_to+0x19d0/0x19d0 [ 30.310072] sock_sendmsg+0xca/0x110 [ 30.313771] SYSC_sendto+0x361/0x5c0 [ 30.317467] ? SYSC_connect+0x4a0/0x4a0 [ 30.321426] ? __do_page_fault+0x5f7/0xc90 [ 30.325658] ? lock_downgrade+0x980/0x980 [ 30.329796] ? handle_mm_fault+0x43b/0x970 [ 30.334053] ? up_read+0x1a/0x40 [ 30.337400] ? __do_page_fault+0x3d6/0xc90 [ 30.341620] ? mm_fault_error+0x2c0/0x2c0 [ 30.345756] ? move_addr_to_kernel+0x60/0x60 [ 30.350150] SyS_sendto+0x40/0x50 [ 30.353583] ? SyS_getpeername+0x30/0x30 [ 30.358403] do_syscall_64+0x282/0x940 [ 30.362285] ? __do_page_fault+0xc90/0xc90 [ 30.366502] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.371257] ? syscall_return_slowpath+0x550/0x550 [ 30.376172] ? syscall_return_slowpath+0x2ac/0x550 [ 30.381081] ? prepare_exit_to_usermode+0x350/0x350 [ 30.386087] ? retint_user+0x18/0x18 [ 30.389792] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.394625] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 30.399795] RIP: 0033:0x445319 [ 30.402976] RSP: 002b:00007ffc40e94df8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 30.410664] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445319 [ 30.417910] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000004 [ 30.425158] RBP: 00007ffc40e94f18 R08: 000000002069affb R09: 0000000000000010 [ 30.432929] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffc40e94f18 [ 30.440178] R13: 00000000004027e0 R14: 0000000000000000 R15: 0000000000000000