[....] Starting enhanced syslogd: rsyslogd[ 17.070011] audit: type=1400 audit(1518424924.943:5): avc: denied { syslog } for pid=4030 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.217175] audit: type=1400 audit(1518424930.090:6): avc: denied { map } for pid=4169 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 '10.128.0.31' (ECDSA) to the list of known hosts. executing program [ 28.482845] audit: type=1400 audit(1518424936.356:7): avc: denied { map } for pid=4183 comm="syzkaller256342" path="/root/syzkaller256342278" 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 [ 28.511048] [ 28.512766] ============================= [ 28.516920] WARNING: suspicious RCU usage [ 28.521079] 4.15.0+ #222 Not tainted [ 28.524795] ----------------------------- [ 28.528943] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.538216] [ 28.538216] other info that might help us debug this: [ 28.538216] [ 28.546369] [ 28.546369] rcu_scheduler_active = 2, debug_locks = 1 [ 28.553053] 1 lock held by syzkaller256342/4183: [ 28.557808] #0: (rcu_read_lock){....}, at: [<00000000ffa830b7>] __rds_conn_create+0xe46/0x1b50 [ 28.566755] [ 28.566755] stack backtrace: [ 28.571257] CPU: 0 PID: 4183 Comm: syzkaller256342 Not tainted 4.15.0+ #222 [ 28.578327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.587654] Call Trace: [ 28.590214] dump_stack+0x194/0x257 [ 28.593816] ? arch_local_irq_restore+0x53/0x53 [ 28.598469] lockdep_rcu_suspicious+0x123/0x170 [ 28.603115] ___might_sleep+0x385/0x470 [ 28.607064] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.612917] ? __debug_object_init+0x235/0x1040 [ 28.617558] ? debug_mutex_init+0x1c/0x60 [ 28.621681] __might_sleep+0x95/0x190 [ 28.625457] kmem_cache_alloc_trace+0x299/0x740 [ 28.630099] ? lock_acquire+0x1d5/0x580 [ 28.634047] ? lock_acquire+0x1d5/0x580 [ 28.637994] ? __rds_conn_create+0xe46/0x1b50 [ 28.642471] rds_loop_conn_alloc+0xc8/0x380 [ 28.646767] ? rds_loop_conn_free+0x290/0x290 [ 28.651236] ? __init_waitqueue_head+0x97/0x140 [ 28.655881] ? rcutorture_record_progress+0x10/0x10 [ 28.660874] ? __lockdep_init_map+0xe4/0x650 [ 28.665281] __rds_conn_create+0x112f/0x1b50 [ 28.669683] ? rds_conn_drop+0xb0/0xb0 [ 28.673546] ? lock_release+0xa40/0xa40 [ 28.677502] ? __raw_spin_lock_init+0x1c/0x100 [ 28.682062] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.687057] ? __lockdep_init_map+0xe4/0x650 [ 28.691441] ? lockdep_init_map+0x9/0x10 [ 28.695475] ? __init_waitqueue_head+0x97/0x140 [ 28.700118] ? init_wait_entry+0x1b0/0x1b0 [ 28.704333] ? lockdep_init_map+0x9/0x10 [ 28.708371] ? rds_message_alloc+0x28c/0x330 [ 28.712753] ? rds_message_next_extension+0x210/0x210 [ 28.717914] ? trace_hardirqs_on+0xd/0x10 [ 28.722044] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.726431] ? __release_sock+0x360/0x360 [ 28.730548] ? lock_sock_nested+0x91/0x110 [ 28.734770] rds_conn_create_outgoing+0x3f/0x50 [ 28.739419] rds_sendmsg+0xda3/0x2390 [ 28.743192] ? avc_has_perm+0x43e/0x680 [ 28.747154] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.751628] ? lock_downgrade+0x980/0x980 [ 28.755753] ? rw_copy_check_uvector+0x1be/0x280 [ 28.760488] ? sock_has_perm+0x2a4/0x420 [ 28.764529] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.769865] ? dup_iter+0x1a2/0x260 [ 28.773469] ? kasan_check_write+0x14/0x20 [ 28.777681] ? copy_msghdr_from_user+0x3a6/0x590 [ 28.782408] ? check_noncircular+0x20/0x20 [ 28.786619] ? selinux_socket_sendmsg+0x36/0x40 [ 28.791261] ? security_socket_sendmsg+0x89/0xb0 [ 28.795989] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.800460] sock_sendmsg+0xca/0x110 [ 28.804149] ___sys_sendmsg+0x767/0x8b0 [ 28.808101] ? copy_msghdr_from_user+0x590/0x590 [ 28.812836] ? __pmd_alloc+0x4e0/0x4e0 [ 28.816696] ? check_noncircular+0x20/0x20 [ 28.820904] ? lock_release+0xa40/0xa40 [ 28.824853] ? lock_acquire+0x1d5/0x580 [ 28.828798] ? check_noncircular+0x20/0x20 [ 28.833009] ? find_held_lock+0x35/0x1d0 [ 28.837053] ? __fget_light+0x2b2/0x3c0 [ 28.841000] ? fget_raw+0x20/0x20 [ 28.844430] ? handle_mm_fault+0x270/0x970 [ 28.848642] ? find_held_lock+0x35/0x1d0 [ 28.852684] ? __do_page_fault+0x5f7/0xc90 [ 28.856894] ? lock_downgrade+0x980/0x980 [ 28.861035] __sys_sendmsg+0xe5/0x210 [ 28.864809] ? __sys_sendmsg+0xe5/0x210 [ 28.868756] ? SyS_shutdown+0x290/0x290 [ 28.872710] ? __do_page_fault+0x3d6/0xc90 [ 28.876926] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.882443] SyS_sendmsg+0x2d/0x50 [ 28.885957] ? __sys_sendmsg+0x210/0x210 [ 28.889994] do_syscall_64+0x282/0x940 [ 28.893859] ? __do_page_fault+0xc90/0xc90 [ 28.898066] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.902794] ? syscall_return_slowpath+0x550/0x550 [ 28.907954] ? syscall_return_slowpath+0x2ac/0x550 [ 28.912860] ? prepare_exit_to_usermode+0x350/0x350 [ 28.917848] ? retint_user+0x18/0x18 [ 28.921539] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.926361] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 28.931524] RIP: 0033:0x43fdf9 [ 28.934685] RSP: 002b:00007ffdd665db58 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 28.942364] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 28.949604] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 28.956845] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 28.964086] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 28.971328] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 28.978672] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 28.986149] in_atomic(): 1, irqs_disabled(): 0, pid: 4183, name: syzkaller256342 [ 28.993731] 1 lock held by syzkaller256342/4183: [ 28.998494] #0: (rcu_read_lock){....}, at: [<00000000ffa830b7>] __rds_conn_create+0xe46/0x1b50 [ 29.007446] CPU: 0 PID: 4183 Comm: syzkaller256342 Not tainted 4.15.0+ #222 [ 29.014528] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.023856] Call Trace: [ 29.026419] dump_stack+0x194/0x257 [ 29.030033] ? arch_local_irq_restore+0x53/0x53 [ 29.034694] ? print_lock+0x9f/0xa2 [ 29.038294] ? lockdep_print_held_locks+0xc4/0x130 [ 29.043201] ___might_sleep+0x2b2/0x470 [ 29.047147] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.053004] ? __debug_object_init+0x235/0x1040 [ 29.057656] ? debug_mutex_init+0x1c/0x60 [ 29.061790] __might_sleep+0x95/0x190 [ 29.065571] kmem_cache_alloc_trace+0x299/0x740 [ 29.070216] ? lock_acquire+0x1d5/0x580 [ 29.074164] ? lock_acquire+0x1d5/0x580 [ 29.078110] ? __rds_conn_create+0xe46/0x1b50 [ 29.082581] rds_loop_conn_alloc+0xc8/0x380 [ 29.086874] ? rds_loop_conn_free+0x290/0x290 [ 29.091342] ? __init_waitqueue_head+0x97/0x140 [ 29.095985] ? rcutorture_record_progress+0x10/0x10 [ 29.100976] ? __lockdep_init_map+0xe4/0x650 [ 29.105359] __rds_conn_create+0x112f/0x1b50 [ 29.109758] ? rds_conn_drop+0xb0/0xb0 [ 29.113619] ? lock_release+0xa40/0xa40 [ 29.117572] ? __raw_spin_lock_init+0x1c/0x100 [ 29.122129] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.127124] ? __lockdep_init_map+0xe4/0x650 [ 29.131513] ? lockdep_init_map+0x9/0x10 [ 29.135546] ? __init_waitqueue_head+0x97/0x140 [ 29.140186] ? init_wait_entry+0x1b0/0x1b0 [ 29.144397] ? lockdep_init_map+0x9/0x10 [ 29.148435] ? rds_message_alloc+0x28c/0x330 [ 29.152814] ? rds_message_next_extension+0x210/0x210 [ 29.157972] ? trace_hardirqs_on+0xd/0x10 [ 29.162097] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.166483] ? __release_sock+0x360/0x360 [ 29.170604] ? lock_sock_nested+0x91/0x110 [ 29.174816] rds_conn_create_outgoing+0x3f/0x50 [ 29.179462] rds_sendmsg+0xda3/0x2390 [ 29.183233] ? avc_has_perm+0x43e/0x680 [ 29.187191] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.191664] ? lock_downgrade+0x980/0x980 [ 29.195790] ? rw_copy_check_uvector+0x1be/0x280 [ 29.200528] ? sock_has_perm+0x2a4/0x420 [ 29.204563] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.209896] ? dup_iter+0x1a2/0x260 [ 29.213500] ? kasan_check_write+0x14/0x20 [ 29.217713] ? copy_msghdr_from_user+0x3a6/0x590 [ 29.222442] ? check_noncircular+0x20/0x20 [ 29.226658] ? selinux_socket_sendmsg+0x36/0x40 [ 29.231299] ? security_socket_sendmsg+0x89/0xb0 [ 29.236033] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.240504] sock_sendmsg+0xca/0x110 [ 29.244191] ___sys_sendmsg+0x767/0x8b0 [ 29.248144] ? copy_msghdr_from_user+0x590/0x590 [ 29.252879] ? __pmd_alloc+0x4e0/0x4e0 [ 29.256738] ? check_noncircular+0x20/0x20 [ 29.260941] ? lock_release+0xa40/0xa40 [ 29.264888] ? lock_acquire+0x1d5/0x580 [ 29.268834] ? check_noncircular+0x20/0x20 [ 29.273042] ? find_held_lock+0x35/0x1d0 [ 29.277081] ? __fget_light+0x2b2/0x3c0 [ 29.281033] ? fget_raw+0x20/0x20 [ 29.284464] ? handle_mm_fault+0x270/0x970 [ 29.288675] ? find_held_lock+0x35/0x1d0 [ 29.292717] ? __do_page_fault+0x5f7/0xc90 [ 29.296926] ? lock_downgrade+0x980/0x980 [ 29.301056] __sys_sendmsg+0xe5/0x210 [ 29.304827] ? __sys_sendmsg+0xe5/0x210 [ 29.308785] ? SyS_shutdown+0x290/0x290 [ 29.312740] ? __do_page_fault+0x3d6/0xc90 [ 29.316957] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.322474] SyS_sendmsg+0x2d/0x50 [ 29.325985] ? __sys_sendmsg+0x210/0x210 [ 29.330025] do_syscall_64+0x282/0x940 [ 29.333887] ? __do_page_fault+0xc90/0xc90 [ 29.338093] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.342821] ? syscall_return_slowpath+0x550/0x550 [ 29.347722] ? syscall_return_slowpath+0x2ac/0x550 [ 29.352623] ? prepare_exit_to_usermode+0x350/0x350 [ 29.357611] ? retint_user+0x18/0x18 [ 29.361310] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.366131] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.371301] RIP: 0033:0x43fdf9 [ 29.374463] RSP: 002b:00007ffdd665db58 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 29.382144] RAX: ffffffffffffffda RBX: 0000000000400