[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.462812][ T26] audit: type=1800 audit(1569324829.634:25): pid=8763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.485832][ T26] audit: type=1800 audit(1569324829.634:26): pid=8763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.506554][ T26] audit: type=1800 audit(1569324829.634:27): pid=8763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 67.764026][ T8916] IPVS: ftp: loaded support on port[0] = 21 [ 67.798397][ T8918] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935 [ 67.808081][ T8918] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8918, name: syz-executor569 [ 67.817568][ T8918] 2 locks held by syz-executor569/8918: [ 67.823300][ T8918] #0: ffffffff899a0de0 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 [ 67.832211][ T8918] #1: ffff8880a67cd800 (&(&sch->q.lock)->rlock){+...}, at: sfb_change+0x257/0xe90 [ 67.841594][ T8918] Preemption disabled at: [ 67.841616][ T8918] [] sfb_change+0x257/0xe90 [ 67.852051][ T8918] CPU: 1 PID: 8918 Comm: syz-executor569 Not tainted 5.3.0+ #0 [ 67.859581][ T8918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.869625][ T8918] Call Trace: [ 67.872920][ T8918] dump_stack+0x172/0x1f0 [ 67.877247][ T8918] ? sfb_change+0x257/0xe90 [ 67.881739][ T8918] ___might_sleep.cold+0x1fb/0x23e [ 67.886853][ T8918] __might_sleep+0x95/0x190 [ 67.891354][ T8918] __mutex_lock+0xc5/0x13c0 [ 67.895858][ T8918] ? tcf_chain0_head_change_cb_del.isra.0+0x34/0x3e0 [ 67.902531][ T8918] ? save_stack+0x5c/0x90 [ 67.906841][ T8918] ? save_stack+0x23/0x90 [ 67.911206][ T8918] ? mutex_trylock+0x2d0/0x2d0 [ 67.916050][ T8918] ? fifo_set_limit+0x1a9/0x210 [ 67.920882][ T8918] ? fifo_create_dflt+0x90/0xf0 [ 67.925741][ T8918] ? sfb_change+0x18d/0xe90 [ 67.930265][ T8918] ? tc_modify_qdisc+0xfcf/0x1c50 [ 67.935291][ T8918] ? rtnetlink_rcv_msg+0x463/0xb00 [ 67.940397][ T8918] ? netlink_rcv_skb+0x177/0x450 [ 67.945395][ T8918] ? rtnetlink_rcv+0x1d/0x30 [ 67.949977][ T8918] ? netlink_unicast+0x531/0x710 [ 67.955050][ T8918] ? netlink_sendmsg+0x8a5/0xd60 [ 67.959993][ T8918] ? sock_sendmsg+0xd7/0x130 [ 67.964752][ T8918] ? ___sys_sendmsg+0x803/0x920 [ 67.969599][ T8918] ? __sys_sendmsg+0x105/0x1d0 [ 67.974347][ T8918] ? __x64_sys_sendmsg+0x78/0xb0 [ 67.979271][ T8918] ? do_syscall_64+0xfa/0x760 [ 67.983944][ T8918] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 67.989999][ T8918] ? __kasan_check_read+0x11/0x20 [ 67.995003][ T8918] ? mark_lock+0xc2/0x1220 [ 67.999404][ T8918] mutex_lock_nested+0x16/0x20 [ 68.004175][ T8918] ? mutex_lock_nested+0x16/0x20 [ 68.009096][ T8918] tcf_chain0_head_change_cb_del.isra.0+0x34/0x3e0 [ 68.015579][ T8918] ? __kasan_check_read+0x11/0x20 [ 68.020675][ T8918] ? mark_lock+0xc2/0x1220 [ 68.025101][ T8918] tcf_block_put_ext.part.0+0x2a/0x80 [ 68.030567][ T8918] tcf_block_put+0xbf/0x110 [ 68.035070][ T8918] ? tcf_block_put_ext+0x40/0x40 [ 68.040100][ T8918] ? sfb_destroy+0x80/0x80 [ 68.044515][ T8918] ? sfb_destroy+0x80/0x80 [ 68.048927][ T8918] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.055154][ T8918] ? prandom_u32+0x7d/0xb0 [ 68.059592][ T8918] ? sfb_zero_all_buckets+0x20/0x20 [ 68.064786][ T8918] sfb_destroy+0x37/0x80 [ 68.069013][ T8918] qdisc_destroy+0x11f/0x630 [ 68.073586][ T8918] qdisc_put+0x85/0xa0 [ 68.077637][ T8918] sfb_change+0x3d8/0xe90 [ 68.081972][ T8918] ? __sanitizer_cov_trace_const_cmp1+0x10/0x20 [ 68.088199][ T8918] ? sfb_graft+0x5f0/0x5f0 [ 68.092602][ T8918] ? nla_strcmp+0xe3/0x120 [ 68.096998][ T8918] ? sfb_graft+0x5f0/0x5f0 [ 68.101393][ T8918] tc_modify_qdisc+0xfcf/0x1c50 [ 68.106229][ T8918] ? qdisc_create+0x1210/0x1210 [ 68.111074][ T8918] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.117296][ T8918] ? qdisc_create+0x1210/0x1210 [ 68.122149][ T8918] rtnetlink_rcv_msg+0x463/0xb00 [ 68.127085][ T8918] ? rtnetlink_put_metrics+0x580/0x580 [ 68.132538][ T8918] ? lock_downgrade+0x920/0x920 [ 68.137383][ T8918] ? netlink_deliver_tap+0x22d/0xbf0 [ 68.142651][ T8918] ? find_held_lock+0x35/0x130 [ 68.147417][ T8918] netlink_rcv_skb+0x177/0x450 [ 68.152258][ T8918] ? rtnetlink_put_metrics+0x580/0x580 [ 68.157713][ T8918] ? netlink_ack+0xb30/0xb30 [ 68.162293][ T8918] ? __kasan_check_read+0x11/0x20 [ 68.167312][ T8918] ? netlink_deliver_tap+0x254/0xbf0 [ 68.172661][ T8918] rtnetlink_rcv+0x1d/0x30 [ 68.177082][ T8918] netlink_unicast+0x531/0x710 [ 68.181839][ T8918] ? netlink_attachskb+0x7c0/0x7c0 [ 68.186937][ T8918] ? _copy_from_iter_full+0x25d/0x8a0 [ 68.192299][ T8918] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 68.198002][ T8918] ? __check_object_size+0x3d/0x437 [ 68.203187][ T8918] netlink_sendmsg+0x8a5/0xd60 [ 68.207936][ T8918] ? netlink_unicast+0x710/0x710 [ 68.213125][ T8918] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 68.218673][ T8918] ? apparmor_socket_sendmsg+0x2a/0x30 [ 68.224186][ T8918] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.230419][ T8918] ? security_socket_sendmsg+0x8d/0xc0 [ 68.235874][ T8918] ? netlink_unicast+0x710/0x710 [ 68.240931][ T8918] sock_sendmsg+0xd7/0x130 [ 68.245333][ T8918] ___sys_sendmsg+0x803/0x920 [ 68.250005][ T8918] ? copy_msghdr_from_user+0x440/0x440 [ 68.255465][ T8918] ? __kasan_check_read+0x11/0x20 [ 68.260475][ T8918] ? __fget+0x384/0x560 [ 68.264645][ T8918] ? ksys_dup3+0x3e0/0x3e0 [ 68.269069][ T8918] ? __kasan_check_read+0x11/0x20 [ 68.274096][ T8918] ? __fget_light+0x1a9/0x230 [ 68.278913][ T8918] ? __fdget+0x1b/0x20 [ 68.282967][ T8918] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.289192][ T8918] __sys_sendmsg+0x105/0x1d0 [ 68.293774][ T8918] ? __sys_sendmsg_sock+0xd0/0xd0 [ 68.298785][ T8918] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 68.304774][ T8918] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 68.310223][ T8918] ? do_syscall_64+0x26/0x760 [ 68.314879][ T8918] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.321096][ T8918] ? do_syscall_64+0x26/0x760 [ 68.325781][ T8918] __x64_sys_sendmsg+0x78/0xb0 [ 68.330548][ T8918] do_syscall_64+0xfa/0x760 [ 68.335039][ T8918] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.340912][ T8918] RIP: 0033:0x4464d9 [ 68.344809][ T8918] Code: e8 1c ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.364510][ T8918] RSP: 002b:00007f5475f13db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 68.372910][ T8918] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 00000000004464d9 [ 68.380866][ T8918] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 [ 68.388833][ T8918] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 68.396787][ T8918] R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000006dbc5c [ 68.404740][ T8918] R13: 00007ffcb6f96a3f R14: 00007f5475f149c0 R15: 0000000000000001