[....] Starting enhanced syslogd: rsyslogd[ 13.934479] audit: type=1400 audit(1518307145.987:5): avc: denied { syslog } for pid=3905 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: [ 18.962988] audit: type=1400 audit(1518307151.015:6): avc: denied { map } for pid=4047 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 '10.128.0.33' (ECDSA) to the list of known hosts. executing program [ 25.201837] audit: type=1400 audit(1518307157.254:7): avc: denied { map } for pid=4061 comm="syzkaller724830" path="/root/syzkaller724830020" 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 [ 25.229685] [ 25.231360] ============================= [ 25.235510] WARNING: suspicious RCU usage [ 25.239658] 4.15.0+ #222 Not tainted [ 25.243372] ----------------------------- [ 25.247521] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.256810] [ 25.256810] other info that might help us debug this: [ 25.256810] [ 25.264959] [ 25.264959] rcu_scheduler_active = 2, debug_locks = 1 [ 25.271625] 1 lock held by syzkaller724830/4061: [ 25.276377] #0: (rcu_read_lock){....}, at: [<00000000ca9f1d1a>] __rds_conn_create+0xe46/0x1b50 [ 25.285319] [ 25.285319] stack backtrace: [ 25.289816] CPU: 0 PID: 4061 Comm: syzkaller724830 Not tainted 4.15.0+ #222 [ 25.296885] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.306208] Call Trace: [ 25.308805] dump_stack+0x194/0x257 [ 25.312413] ? arch_local_irq_restore+0x53/0x53 [ 25.317065] lockdep_rcu_suspicious+0x123/0x170 [ 25.321706] ___might_sleep+0x385/0x470 [ 25.325652] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.331508] ? __debug_object_init+0x235/0x1040 [ 25.336152] ? debug_mutex_init+0x1c/0x60 [ 25.340277] __might_sleep+0x95/0x190 [ 25.344058] kmem_cache_alloc_trace+0x299/0x740 [ 25.348698] ? lock_acquire+0x1d5/0x580 [ 25.352642] ? lock_acquire+0x1d5/0x580 [ 25.356588] ? __rds_conn_create+0xe46/0x1b50 [ 25.361061] rds_loop_conn_alloc+0xc8/0x380 [ 25.365356] ? rds_loop_conn_free+0x290/0x290 [ 25.369828] ? __init_waitqueue_head+0x97/0x140 [ 25.374470] ? rcutorture_record_progress+0x10/0x10 [ 25.379460] ? __lockdep_init_map+0xe4/0x650 [ 25.383844] __rds_conn_create+0x112f/0x1b50 [ 25.388250] ? rds_conn_drop+0xb0/0xb0 [ 25.392126] ? __raw_spin_lock_init+0x1c/0x100 [ 25.396683] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.401690] ? __lockdep_init_map+0xe4/0x650 [ 25.406073] ? lockdep_init_map+0x9/0x10 [ 25.410105] ? __init_waitqueue_head+0x97/0x140 [ 25.414746] ? init_wait_entry+0x1b0/0x1b0 [ 25.418956] ? lockdep_init_map+0x9/0x10 [ 25.422996] ? rds_message_alloc+0x28c/0x330 [ 25.427380] ? rds_message_next_extension+0x210/0x210 [ 25.432538] ? trace_hardirqs_on+0xd/0x10 [ 25.436662] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.441057] ? __release_sock+0x360/0x360 [ 25.445179] ? lock_sock_nested+0x91/0x110 [ 25.449389] rds_conn_create_outgoing+0x3f/0x50 [ 25.454037] rds_sendmsg+0xda3/0x2390 [ 25.457810] ? avc_has_perm+0x43e/0x680 [ 25.461768] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.466244] ? lock_downgrade+0x980/0x980 [ 25.470367] ? rw_copy_check_uvector+0x1be/0x280 [ 25.475131] ? sock_has_perm+0x2a4/0x420 [ 25.479166] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.484500] ? dup_iter+0x1a2/0x260 [ 25.488102] ? kasan_check_write+0x14/0x20 [ 25.492316] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.497043] ? check_noncircular+0x20/0x20 [ 25.501254] ? selinux_socket_sendmsg+0x36/0x40 [ 25.505893] ? security_socket_sendmsg+0x89/0xb0 [ 25.510619] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.515087] sock_sendmsg+0xca/0x110 [ 25.518784] ___sys_sendmsg+0x767/0x8b0 [ 25.522735] ? copy_msghdr_from_user+0x590/0x590 [ 25.527469] ? __pmd_alloc+0x4e0/0x4e0 [ 25.531326] ? check_noncircular+0x20/0x20 [ 25.535530] ? lock_release+0xa40/0xa40 [ 25.539477] ? lock_acquire+0x1d5/0x580 [ 25.543424] ? check_noncircular+0x20/0x20 [ 25.547632] ? find_held_lock+0x35/0x1d0 [ 25.551669] ? __fget_light+0x2b2/0x3c0 [ 25.555617] ? fget_raw+0x20/0x20 [ 25.559042] ? handle_mm_fault+0x270/0x970 [ 25.563255] ? find_held_lock+0x35/0x1d0 [ 25.567294] ? __do_page_fault+0x5f7/0xc90 [ 25.571502] ? lock_downgrade+0x980/0x980 [ 25.575631] __sys_sendmsg+0xe5/0x210 [ 25.579400] ? __sys_sendmsg+0xe5/0x210 [ 25.583348] ? SyS_shutdown+0x290/0x290 [ 25.587301] ? __do_page_fault+0x3d6/0xc90 [ 25.591517] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.597036] SyS_sendmsg+0x2d/0x50 [ 25.600550] ? __sys_sendmsg+0x210/0x210 [ 25.604584] do_syscall_64+0x282/0x940 [ 25.608440] ? __do_page_fault+0xc90/0xc90 [ 25.612645] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.617372] ? syscall_return_slowpath+0x550/0x550 [ 25.622275] ? syscall_return_slowpath+0x2ac/0x550 [ 25.627177] ? prepare_exit_to_usermode+0x350/0x350 [ 25.632165] ? retint_user+0x18/0x18 [ 25.635856] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.640674] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.645833] RIP: 0033:0x43fdf9 [ 25.648994] RSP: 002b:00007ffd8274b5a8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 25.656684] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 25.663923] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 25.671167] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 25.678407] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 25.685646] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 25.692976] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.700438] in_atomic(): 1, irqs_disabled(): 0, pid: 4061, name: syzkaller724830 [ 25.707977] 1 lock held by syzkaller724830/4061: [ 25.712738] #0: (rcu_read_lock){....}, at: [<00000000ca9f1d1a>] __rds_conn_create+0xe46/0x1b50 [ 25.721687] CPU: 0 PID: 4061 Comm: syzkaller724830 Not tainted 4.15.0+ #222 [ 25.728763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.738086] Call Trace: [ 25.740650] dump_stack+0x194/0x257 [ 25.744253] ? arch_local_irq_restore+0x53/0x53 [ 25.748894] ? print_lock+0x9f/0xa2 [ 25.752491] ? lockdep_print_held_locks+0xc4/0x130 [ 25.757398] ___might_sleep+0x2b2/0x470 [ 25.761345] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.767200] ? __debug_object_init+0x235/0x1040 [ 25.771841] ? debug_mutex_init+0x1c/0x60 [ 25.775965] __might_sleep+0x95/0x190 [ 25.779742] kmem_cache_alloc_trace+0x299/0x740 [ 25.784385] ? lock_acquire+0x1d5/0x580 [ 25.788329] ? lock_acquire+0x1d5/0x580 [ 25.792274] ? __rds_conn_create+0xe46/0x1b50 [ 25.796744] rds_loop_conn_alloc+0xc8/0x380 [ 25.801047] ? rds_loop_conn_free+0x290/0x290 [ 25.805519] ? __init_waitqueue_head+0x97/0x140 [ 25.810164] ? rcutorture_record_progress+0x10/0x10 [ 25.815151] ? __lockdep_init_map+0xe4/0x650 [ 25.819535] __rds_conn_create+0x112f/0x1b50 [ 25.823931] ? rds_conn_drop+0xb0/0xb0 [ 25.827799] ? __raw_spin_lock_init+0x1c/0x100 [ 25.832353] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.837345] ? __lockdep_init_map+0xe4/0x650 [ 25.841726] ? lockdep_init_map+0x9/0x10 [ 25.845757] ? __init_waitqueue_head+0x97/0x140 [ 25.850398] ? init_wait_entry+0x1b0/0x1b0 [ 25.854607] ? lockdep_init_map+0x9/0x10 [ 25.858642] ? rds_message_alloc+0x28c/0x330 [ 25.863028] ? rds_message_next_extension+0x210/0x210 [ 25.868193] ? trace_hardirqs_on+0xd/0x10 [ 25.872318] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.876703] ? __release_sock+0x360/0x360 [ 25.880819] ? lock_sock_nested+0x91/0x110 [ 25.885035] rds_conn_create_outgoing+0x3f/0x50 [ 25.889680] rds_sendmsg+0xda3/0x2390 [ 25.893454] ? avc_has_perm+0x43e/0x680 [ 25.897413] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.901885] ? lock_downgrade+0x980/0x980 [ 25.906015] ? rw_copy_check_uvector+0x1be/0x280 [ 25.910752] ? sock_has_perm+0x2a4/0x420 [ 25.914787] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.920131] ? dup_iter+0x1a2/0x260 [ 25.923738] ? kasan_check_write+0x14/0x20 [ 25.927951] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.932677] ? check_noncircular+0x20/0x20 [ 25.936888] ? selinux_socket_sendmsg+0x36/0x40 [ 25.941530] ? security_socket_sendmsg+0x89/0xb0 [ 25.946257] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.950724] sock_sendmsg+0xca/0x110 [ 25.954413] ___sys_sendmsg+0x767/0x8b0 [ 25.958363] ? copy_msghdr_from_user+0x590/0x590 [ 25.963095] ? __pmd_alloc+0x4e0/0x4e0 [ 25.966960] ? check_noncircular+0x20/0x20 [ 25.971164] ? lock_release+0xa40/0xa40 [ 25.975108] ? lock_acquire+0x1d5/0x580 [ 25.979054] ? check_noncircular+0x20/0x20 [ 25.983263] ? find_held_lock+0x35/0x1d0 [ 25.987297] ? __fget_light+0x2b2/0x3c0 [ 25.991243] ? fget_raw+0x20/0x20 [ 25.994665] ? handle_mm_fault+0x270/0x970 [ 25.998875] ? find_held_lock+0x35/0x1d0 [ 26.002916] ? __do_page_fault+0x5f7/0xc90 [ 26.007121] ? lock_downgrade+0x980/0x980 [ 26.011250] __sys_sendmsg+0xe5/0x210 [ 26.015029] ? __sys_sendmsg+0xe5/0x210 [ 26.018977] ? SyS_shutdown+0x290/0x290 [ 26.022933] ? __do_page_fault+0x3d6/0xc90 [ 26.027153] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.032667] SyS_sendmsg+0x2d/0x50 [ 26.036179] ? __sys_sendmsg+0x210/0x210 [ 26.040213] do_syscall_64+0x282/0x940 [ 26.044072] ? __do_page_fault+0xc90/0xc90 [ 26.048280] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.053012] ? syscall_return_slowpath+0x550/0x550 [ 26.057919] ? syscall_return_slowpath+0x2ac/0x550 [ 26.062821] ? prepare_exit_to_usermode+0x350/0x350 [ 26.067815] ? retint_user+0x18/0x18 [ 26.071506] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.076328] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.081486] RIP: 0033:0x43fdf9 [ 26.084646] RSP: 002b:00007ffd8274b5a8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.092323] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 26.099564] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 00000000