[....] Starting enhanced syslogd: rsyslogd[ 15.935489] audit: type=1400 audit(1518421838.086:5): avc: denied { syslog } for pid=4003 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: [ 18.951051] audit: type=1400 audit(1518421841.101:6): avc: denied { map } for pid=4141 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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program [ 25.220359] audit: type=1400 audit(1518421847.371:7): avc: denied { map } for pid=4155 comm="syzkaller608973" path="/root/syzkaller608973273" 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 [ 25.247843] [ 25.249527] ============================= [ 25.253683] WARNING: suspicious RCU usage [ 25.257835] 4.16.0-rc1+ #309 Not tainted [ 25.261897] ----------------------------- [ 25.266066] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.275333] [ 25.275333] other info that might help us debug this: [ 25.275333] [ 25.283480] [ 25.283480] rcu_scheduler_active = 2, debug_locks = 1 [ 25.290156] 1 lock held by syzkaller608973/4155: [ 25.294910] #0: (rcu_read_lock){....}, at: [<000000006b92ef72>] __rds_conn_create+0xe46/0x1b50 [ 25.303860] [ 25.303860] stack backtrace: [ 25.308364] CPU: 0 PID: 4155 Comm: syzkaller608973 Not tainted 4.16.0-rc1+ #309 [ 25.315785] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.325109] Call Trace: [ 25.327668] dump_stack+0x194/0x257 [ 25.331269] ? arch_local_irq_restore+0x53/0x53 [ 25.335924] lockdep_rcu_suspicious+0x123/0x170 [ 25.340566] ___might_sleep+0x385/0x470 [ 25.344513] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.350367] ? __debug_object_init+0x235/0x1040 [ 25.355009] ? debug_mutex_init+0x1c/0x60 [ 25.359134] __might_sleep+0x95/0x190 [ 25.362912] kmem_cache_alloc_trace+0x299/0x740 [ 25.367554] ? lock_acquire+0x1d5/0x580 [ 25.371499] ? lock_acquire+0x1d5/0x580 [ 25.375449] ? __rds_conn_create+0xe46/0x1b50 [ 25.379920] rds_loop_conn_alloc+0xc8/0x380 [ 25.384213] ? rds_loop_conn_free+0x290/0x290 [ 25.388685] ? __init_waitqueue_head+0x97/0x140 [ 25.393330] ? rcutorture_record_progress+0x10/0x10 [ 25.398321] ? __lockdep_init_map+0xe4/0x650 [ 25.402705] __rds_conn_create+0x112f/0x1b50 [ 25.407102] ? rds_conn_drop+0xb0/0xb0 [ 25.410970] ? __raw_spin_lock_init+0x1c/0x100 [ 25.415527] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.420522] ? __lockdep_init_map+0xe4/0x650 [ 25.424904] ? lockdep_init_map+0x9/0x10 [ 25.428935] ? __init_waitqueue_head+0x97/0x140 [ 25.433575] ? init_wait_entry+0x1b0/0x1b0 [ 25.437788] ? lockdep_init_map+0x9/0x10 [ 25.441826] ? rds_message_alloc+0x28c/0x330 [ 25.446207] ? rds_message_next_extension+0x210/0x210 [ 25.451366] ? trace_hardirqs_on+0xd/0x10 [ 25.455490] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.459877] ? __release_sock+0x360/0x360 [ 25.463992] ? lock_sock_nested+0x91/0x110 [ 25.468204] rds_conn_create_outgoing+0x3f/0x50 [ 25.472851] rds_sendmsg+0xda3/0x2390 [ 25.476624] ? avc_has_perm+0x43e/0x680 [ 25.480584] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.485075] ? lock_downgrade+0x980/0x980 [ 25.489214] ? rw_copy_check_uvector+0x1be/0x280 [ 25.493948] ? sock_has_perm+0x2a4/0x420 [ 25.497982] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.503318] ? dup_iter+0x252/0x260 [ 25.506922] ? kasan_check_write+0x14/0x20 [ 25.511134] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.515863] ? check_noncircular+0x20/0x20 [ 25.520073] ? selinux_socket_sendmsg+0x36/0x40 [ 25.524712] ? security_socket_sendmsg+0x89/0xb0 [ 25.529447] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.533918] sock_sendmsg+0xca/0x110 [ 25.537607] ___sys_sendmsg+0x767/0x8b0 [ 25.541558] ? copy_msghdr_from_user+0x590/0x590 [ 25.546292] ? __pmd_alloc+0x4e0/0x4e0 [ 25.550151] ? check_noncircular+0x20/0x20 [ 25.554358] ? lock_release+0xa40/0xa40 [ 25.558305] ? lock_acquire+0x1d5/0x580 [ 25.562251] ? check_noncircular+0x20/0x20 [ 25.566459] ? find_held_lock+0x35/0x1d0 [ 25.570495] ? __fget_light+0x2b2/0x3c0 [ 25.574445] ? fget_raw+0x20/0x20 [ 25.577868] ? handle_mm_fault+0x270/0x970 [ 25.582077] ? find_held_lock+0x35/0x1d0 [ 25.586117] ? __do_page_fault+0x5f7/0xc90 [ 25.590324] ? lock_downgrade+0x980/0x980 [ 25.594452] __sys_sendmsg+0xe5/0x210 [ 25.598225] ? __sys_sendmsg+0xe5/0x210 [ 25.602174] ? SyS_shutdown+0x290/0x290 [ 25.606130] ? __do_page_fault+0x3d6/0xc90 [ 25.610349] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.615862] SyS_sendmsg+0x2d/0x50 [ 25.619374] ? __sys_sendmsg+0x210/0x210 [ 25.623405] do_syscall_64+0x282/0x940 [ 25.627264] ? __do_page_fault+0xc90/0xc90 [ 25.631471] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.636983] ? syscall_return_slowpath+0x550/0x550 [ 25.641885] ? syscall_return_slowpath+0x2ac/0x550 [ 25.646791] ? retint_user+0x18/0x18 [ 25.650484] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.655307] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.660466] RIP: 0033:0x43fdf9 [ 25.663626] RSP: 002b:00007ffe6e054188 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 25.671308] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 25.678547] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 25.685786] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 25.693035] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 25.700283] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 25.707580] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.715048] in_atomic(): 1, irqs_disabled(): 0, pid: 4155, name: syzkaller608973 [ 25.722586] 1 lock held by syzkaller608973/4155: [ 25.727340] #0: (rcu_read_lock){....}, at: [<000000006b92ef72>] __rds_conn_create+0xe46/0x1b50 [ 25.736293] CPU: 0 PID: 4155 Comm: syzkaller608973 Not tainted 4.16.0-rc1+ #309 [ 25.743716] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.753040] Call Trace: [ 25.755603] dump_stack+0x194/0x257 [ 25.759203] ? arch_local_irq_restore+0x53/0x53 [ 25.763847] ? print_lock+0x9f/0xa2 [ 25.767445] ? lockdep_print_held_locks+0xc4/0x130 [ 25.772351] ___might_sleep+0x2b2/0x470 [ 25.776296] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.782149] ? __debug_object_init+0x235/0x1040 [ 25.786789] ? debug_mutex_init+0x1c/0x60 [ 25.790916] __might_sleep+0x95/0x190 [ 25.794692] kmem_cache_alloc_trace+0x299/0x740 [ 25.799333] ? lock_acquire+0x1d5/0x580 [ 25.803280] ? lock_acquire+0x1d5/0x580 [ 25.807226] ? __rds_conn_create+0xe46/0x1b50 [ 25.811698] rds_loop_conn_alloc+0xc8/0x380 [ 25.815992] ? rds_loop_conn_free+0x290/0x290 [ 25.820464] ? __init_waitqueue_head+0x97/0x140 [ 25.825110] ? rcutorture_record_progress+0x10/0x10 [ 25.830099] ? __lockdep_init_map+0xe4/0x650 [ 25.834485] __rds_conn_create+0x112f/0x1b50 [ 25.838886] ? rds_conn_drop+0xb0/0xb0 [ 25.842753] ? __raw_spin_lock_init+0x1c/0x100 [ 25.847307] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.852299] ? __lockdep_init_map+0xe4/0x650 [ 25.856680] ? lockdep_init_map+0x9/0x10 [ 25.860710] ? __init_waitqueue_head+0x97/0x140 [ 25.865352] ? init_wait_entry+0x1b0/0x1b0 [ 25.869564] ? lockdep_init_map+0x9/0x10 [ 25.873598] ? rds_message_alloc+0x28c/0x330 [ 25.877979] ? rds_message_next_extension+0x210/0x210 [ 25.883137] ? trace_hardirqs_on+0xd/0x10 [ 25.887258] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.891642] ? __release_sock+0x360/0x360 [ 25.895757] ? lock_sock_nested+0x91/0x110 [ 25.899981] rds_conn_create_outgoing+0x3f/0x50 [ 25.904624] rds_sendmsg+0xda3/0x2390 [ 25.908393] ? avc_has_perm+0x43e/0x680 [ 25.912351] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.916825] ? lock_downgrade+0x980/0x980 [ 25.920950] ? rw_copy_check_uvector+0x1be/0x280 [ 25.925685] ? sock_has_perm+0x2a4/0x420 [ 25.929720] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.935053] ? dup_iter+0x252/0x260 [ 25.938655] ? kasan_check_write+0x14/0x20 [ 25.942866] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.947590] ? check_noncircular+0x20/0x20 [ 25.951805] ? selinux_socket_sendmsg+0x36/0x40 [ 25.956445] ? security_socket_sendmsg+0x89/0xb0 [ 25.961172] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.965639] sock_sendmsg+0xca/0x110 [ 25.969326] ___sys_sendmsg+0x767/0x8b0 [ 25.973277] ? copy_msghdr_from_user+0x590/0x590 [ 25.978016] ? __pmd_alloc+0x4e0/0x4e0 [ 25.981881] ? check_noncircular+0x20/0x20 [ 25.986086] ? lock_release+0xa40/0xa40 [ 25.990034] ? lock_acquire+0x1d5/0x580 [ 25.993991] ? check_noncircular+0x20/0x20 [ 25.998200] ? find_held_lock+0x35/0x1d0 [ 26.002235] ? __fget_light+0x2b2/0x3c0 [ 26.006182] ? fget_raw+0x20/0x20 [ 26.009604] ? handle_mm_fault+0x270/0x970 [ 26.013814] ? find_held_lock+0x35/0x1d0 [ 26.017854] ? __do_page_fault+0x5f7/0xc90 [ 26.022062] ? lock_downgrade+0x980/0x980 [ 26.026193] __sys_sendmsg+0xe5/0x210 [ 26.029965] ? __sys_sendmsg+0xe5/0x210 [ 26.033910] ? SyS_shutdown+0x290/0x290 [ 26.037863] ? __do_page_fault+0x3d6/0xc90 [ 26.042080] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.047595] SyS_sendmsg+0x2d/0x50 [ 26.051106] ? __sys_sendmsg+0x210/0x210 [ 26.055137] do_syscall_64+0x282/0x940 [ 26.058993] ? __do_page_fault+0xc90/0xc90 [ 26.063203] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.068714] ? syscall_return_slowpath+0x550/0x550 [ 26.073615] ? syscall_return_slowpath+0x2ac/0x550 [ 26.078521] ? retint_user+0x18/0x18 [ 26.082214] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.087038] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.092198] RIP: 0033:0x43fdf9 [ 26.095359] RSP: 002b:00007ffe6e054188 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.103038] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 26.110279] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 26.117517] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000