[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.376373] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.975995] random: sshd: uninitialized urandom read (32 bytes read) [ 24.319909] random: sshd: uninitialized urandom read (32 bytes read) [ 25.064605] random: sshd: uninitialized urandom read (32 bytes read) [ 668.713362] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 674.158475] random: sshd: uninitialized urandom read (32 bytes read) [ 674.280522] IPVS: ftp: loaded support on port[0] = 21 [ 674.288904] IPVS: ftp: loaded support on port[0] = 21 [ 674.293179] IPVS: ftp: loaded support on port[0] = 21 [ 674.300546] IPVS: ftp: loaded support on port[0] = 21 [ 674.303302] IPVS: ftp: loaded support on port[0] = 21 [ 674.311911] IPVS: ftp: loaded support on port[0] = 21 [ 674.321495] IPVS: ftp: loaded support on port[0] = 21 [ 674.327634] IPVS: ftp: loaded support on port[0] = 21 [ 674.467210] EXT4-fs (sda1): re-mounted. Opts: [ 674.474867] EXT4-fs (sda1): re-mounted. Opts: [ 674.479939] EXT4-fs (sda1): re-mounted. Opts: [ 674.484977] EXT4-fs (sda1): re-mounted. Opts: [ 674.491474] EXT4-fs (sda1): re-mounted. Opts: [ 674.498208] EXT4-fs (sda1): re-mounted. Opts: [ 674.503560] EXT4-fs (sda1): re-mounted. Opts: [ 674.508536] EXT4-fs (sda1): re-mounted. Opts: [ 674.513295] EXT4-fs (sda1): re-mounted. Opts: [ 674.518255] EXT4-fs (sda1): re-mounted. Opts: [ 679.471852] EXT4-fs: 2113 callbacks suppressed [ 679.471862] EXT4-fs (sda1): re-mounted. Opts: [ 679.481565] EXT4-fs (sda1): re-mounted. Opts: [ 679.486953] EXT4-fs (sda1): re-mounted. Opts: [ 679.491773] EXT4-fs (sda1): re-mounted. Opts: [ 679.496884] EXT4-fs (sda1): re-mounted. Opts: [ 679.501803] EXT4-fs (sda1): re-mounted. Opts: [ 679.506637] EXT4-fs (sda1): re-mounted. Opts: [ 679.511444] EXT4-fs (sda1): re-mounted. Opts: [ 679.516856] EXT4-fs (sda1): re-mounted. Opts: [ 679.521760] EXT4-fs (sda1): re-mounted. Opts: [ 684.473834] EXT4-fs: 1934 callbacks suppressed [ 684.473844] EXT4-fs (sda1): re-mounted. Opts: [ 684.483419] EXT4-fs (sda1): re-mounted. Opts: [ 684.488775] EXT4-fs (sda1): re-mounted. Opts: [ 684.495288] EXT4-fs (sda1): re-mounted. Opts: [ 684.500081] EXT4-fs (sda1): re-mounted. Opts: [ 684.505238] EXT4-fs (sda1): re-mounted. Opts: [ 684.510103] EXT4-fs (sda1): re-mounted. Opts: [ 684.515258] EXT4-fs (sda1): re-mounted. Opts: [ 684.521704] EXT4-fs (sda1): re-mounted. Opts: [ 684.526646] EXT4-fs (sda1): re-mounted. Opts: [ 689.476888] EXT4-fs: 1944 callbacks suppressed [ 689.476898] EXT4-fs (sda1): re-mounted. Opts: [ 689.486411] EXT4-fs (sda1): re-mounted. Opts: [ 689.494830] EXT4-fs (sda1): re-mounted. Opts: [ 689.502107] EXT4-fs (sda1): re-mounted. Opts: [ 689.507206] EXT4-fs (sda1): re-mounted. Opts: [ 689.512792] EXT4-fs (sda1): re-mounted. Opts: [ 689.517676] EXT4-fs (sda1): re-mounted. Opts: [ 689.522664] EXT4-fs (sda1): re-mounted. Opts: [ 689.527773] EXT4-fs (sda1): re-mounted. Opts: [ 689.532598] EXT4-fs (sda1): re-mounted. Opts: [ 694.484782] EXT4-fs: 1944 callbacks suppressed [ 694.484791] EXT4-fs (sda1): re-mounted. Opts: [ 694.495740] EXT4-fs (sda1): re-mounted. Opts: [ 694.500602] EXT4-fs (sda1): re-mounted. Opts: [ 694.505377] EXT4-fs (sda1): re-mounted. Opts: [ 694.510416] EXT4-fs (sda1): re-mounted. Opts: [ 694.515358] EXT4-fs (sda1): re-mounted. Opts: [ 694.520612] EXT4-fs (sda1): re-mounted. Opts: [ 694.525779] EXT4-fs (sda1): re-mounted. Opts: [ 694.530608] EXT4-fs (sda1): re-mounted. Opts: [ 694.536404] EXT4-fs (sda1): re-mounted. Opts: [ 699.486326] EXT4-fs: 1951 callbacks suppressed [ 699.486335] EXT4-fs (sda1): re-mounted. Opts: [ 699.497701] EXT4-fs (sda1): re-mounted. Opts: [ 699.502475] EXT4-fs (sda1): re-mounted. Opts: [ 699.507356] EXT4-fs (sda1): re-mounted. Opts: [ 699.512436] EXT4-fs (sda1): re-mounted. Opts: [ 699.517604] EXT4-fs (sda1): re-mounted. Opts: [ 699.522509] EXT4-fs (sda1): re-mounted. Opts: [ 699.527399] EXT4-fs (sda1): re-mounted. Opts: [ 699.532637] EXT4-fs (sda1): re-mounted. Opts: [ 699.540457] EXT4-fs (sda1): re-mounted. Opts: [ 704.488167] EXT4-fs: 1953 callbacks suppressed [ 704.488175] EXT4-fs (sda1): re-mounted. Opts: [ 704.498964] EXT4-fs (sda1): re-mounted. Opts: [ 704.504728] EXT4-fs (sda1): re-mounted. Opts: [ 704.509591] EXT4-fs (sda1): re-mounted. Opts: [ 704.516332] EXT4-fs (sda1): re-mounted. Opts: [ 704.521178] EXT4-fs (sda1): re-mounted. Opts: [ 704.525969] EXT4-fs (sda1): re-mounted. Opts: [ 704.530691] EXT4-fs (sda1): re-mounted. Opts: [ 704.535560] EXT4-fs (sda1): re-mounted. Opts: [ 704.540411] EXT4-fs (sda1): re-mounted. Opts: [ 709.498118] EXT4-fs: 1936 callbacks suppressed [ 709.498127] EXT4-fs (sda1): re-mounted. Opts: [ 709.507834] EXT4-fs (sda1): re-mounted. Opts: [ 709.512656] EXT4-fs (sda1): re-mounted. Opts: [ 709.517494] EXT4-fs (sda1): re-mounted. Opts: [ 709.522314] EXT4-fs (sda1): re-mounted. Opts: [ 709.527158] EXT4-fs (sda1): re-mounted. Opts: [ 709.532067] EXT4-fs (sda1): re-mounted. Opts: [ 709.536912] EXT4-fs (sda1): re-mounted. Opts: [ 709.541838] EXT4-fs (sda1): re-mounted. Opts: [ 709.547932] EXT4-fs (sda1): re-mounted. Opts: [ 714.503360] EXT4-fs: 1929 callbacks suppressed [ 714.503369] EXT4-fs (sda1): re-mounted. Opts: [ 714.515838] EXT4-fs (sda1): re-mounted. Opts: [ 714.520606] EXT4-fs (sda1): re-mounted. Opts: [ 714.525365] EXT4-fs (sda1): re-mounted. Opts: [ 714.532769] EXT4-fs (sda1): re-mounted. Opts: [ 714.538299] EXT4-fs (sda1): re-mounted. Opts: [ 714.543389] EXT4-fs (sda1): re-mounted. Opts: [ 714.549296] EXT4-fs (sda1): re-mounted. Opts: [ 714.555228] EXT4-fs (sda1): re-mounted. Opts: [ 714.560168] EXT4-fs (sda1): re-mounted. Opts: [ 719.510231] EXT4-fs: 1939 callbacks suppressed [ 719.510241] EXT4-fs (sda1): re-mounted. Opts: [ 719.521704] EXT4-fs (sda1): re-mounted. Opts: [ 719.526662] EXT4-fs (sda1): re-mounted. Opts: [ 719.531846] EXT4-fs (sda1): re-mounted. Opts: [ 719.537313] EXT4-fs (sda1): re-mounted. Opts: [ 719.542929] EXT4-fs (sda1): re-mounted. Opts: [ 719.547815] EXT4-fs (sda1): re-mounted. Opts: [ 719.552948] EXT4-fs (sda1): re-mounted. Opts: [ 719.559053] EXT4-fs (sda1): re-mounted. Opts: [ 719.563919] EXT4-fs (sda1): re-mounted. Opts: [ 724.511741] EXT4-fs: 1938 callbacks suppressed [ 724.511752] EXT4-fs (sda1): re-mounted. Opts: [ 724.522390] EXT4-fs (sda1): re-mounted. Opts: [ 724.527682] EXT4-fs (sda1): re-mounted. Opts: [ 724.534283] EXT4-fs (sda1): re-mounted. Opts: [ 724.539673] EXT4-fs (sda1): re-mounted. Opts: [ 724.544521] EXT4-fs (sda1): re-mounted. Opts: [ 724.549347] EXT4-fs (sda1): re-mounted. Opts: [ 724.554231] EXT4-fs (sda1): re-mounted. Opts: [ 724.559104] EXT4-fs (sda1): re-mounted. Opts: [ 724.563889] EXT4-fs (sda1): re-mounted. Opts: [ 729.513372] EXT4-fs: 1950 callbacks suppressed [ 729.513381] EXT4-fs (sda1): re-mounted. Opts: [ 729.522955] EXT4-fs (sda1): re-mounted. Opts: [ 729.528127] EXT4-fs (sda1): re-mounted. Opts: [ 729.532871] EXT4-fs (sda1): re-mounted. Opts: [ 729.537730] EXT4-fs (sda1): re-mounted. Opts: [ 729.542525] EXT4-fs (sda1): re-mounted. Opts: [ 729.550239] EXT4-fs (sda1): re-mounted. Opts: [ 729.556393] EXT4-fs (sda1): re-mounted. Opts: [ 729.562581] EXT4-fs (sda1): re-mounted. Opts: [ 729.567582] EXT4-fs (sda1): re-mounted. Opts: [ 734.516909] EXT4-fs: 1937 callbacks suppressed [ 734.516917] EXT4-fs (sda1): re-mounted. Opts: [ 734.527886] EXT4-fs (sda1): re-mounted. Opts: [ 734.532658] EXT4-fs (sda1): re-mounted. Opts: [ 734.537470] EXT4-fs (sda1): re-mounted. Opts: [ 734.542418] EXT4-fs (sda1): re-mounted. Opts: [ 734.548886] EXT4-fs (sda1): re-mounted. Opts: [ 734.556540] EXT4-fs (sda1): re-mounted. Opts: [ 734.562797] EXT4-fs (sda1): re-mounted. Opts: [ 734.568876] EXT4-fs (sda1): re-mounted. Opts: [ 734.573719] EXT4-fs (sda1): re-mounted. Opts: [ 739.521261] EXT4-fs: 1956 callbacks suppressed [ 739.521271] EXT4-fs (sda1): re-mounted. Opts: [ 739.530876] EXT4-fs (sda1): re-mounted. Opts: [ 739.535846] EXT4-fs (sda1): re-mounted. Opts: [ 739.540704] EXT4-fs (sda1): re-mounted. Opts: [ 739.546626] EXT4-fs (sda1): re-mounted. Opts: [ 739.551610] EXT4-fs (sda1): re-mounted. Opts: [ 739.556450] EXT4-fs (sda1): re-mounted. Opts: [ 739.561311] EXT4-fs (sda1): re-mounted. Opts: [ 739.566145] EXT4-fs (sda1): re-mounted. Opts: [ 739.572571] EXT4-fs (sda1): re-mounted. Opts: [ 744.522795] EXT4-fs: 1936 callbacks suppressed [ 744.522803] EXT4-fs (sda1): re-mounted. Opts: [ 744.532501] EXT4-fs (sda1): re-mounted. Opts: [ 744.537992] EXT4-fs (sda1): re-mounted. Opts: [ 744.542992] EXT4-fs (sda1): re-mounted. Opts: [ 744.550196] EXT4-fs (sda1): re-mounted. Opts: [ 744.554961] EXT4-fs (sda1): re-mounted. Opts: [ 744.559782] EXT4-fs (sda1): re-mounted. Opts: [ 744.564531] EXT4-fs (sda1): re-mounted. Opts: [ 744.569705] EXT4-fs (sda1): re-mounted. Opts: [ 744.574568] EXT4-fs (sda1): re-mounted. Opts: [ 749.523982] EXT4-fs: 1953 callbacks suppressed [ 749.523992] EXT4-fs (sda1): re-mounted. Opts: [ 749.535523] EXT4-fs (sda1): re-mounted. Opts: [ 749.540509] EXT4-fs (sda1): re-mounted. Opts: [ 749.546762] EXT4-fs (sda1): re-mounted. Opts: [ 749.551923] EXT4-fs (sda1): re-mounted. Opts: [ 749.556803] EXT4-fs (sda1): re-mounted. Opts: [ 749.561610] EXT4-fs (sda1): re-mounted. Opts: [ 749.566589] EXT4-fs (sda1): re-mounted. Opts: [ 749.571371] EXT4-fs (sda1): re-mounted. Opts: [ 749.576254] EXT4-fs (sda1): re-mounted. Opts: [ 754.527556] EXT4-fs: 1939 callbacks suppressed [ 754.527566] EXT4-fs (sda1): re-mounted. Opts: [ 754.537109] EXT4-fs (sda1): re-mounted. Opts: [ 754.543642] EXT4-fs (sda1): re-mounted. Opts: [ 754.548486] EXT4-fs (sda1): re-mounted. Opts: [ 754.553386] EXT4-fs (sda1): re-mounted. Opts: [ 754.558354] EXT4-fs (sda1): re-mounted. Opts: [ 754.563342] EXT4-fs (sda1): re-mounted. Opts: [ 754.568115] EXT4-fs (sda1): re-mounted. Opts: [ 754.572997] EXT4-fs (sda1): re-mounted. Opts: [ 754.578437] EXT4-fs (sda1): re-mounted. Opts: [ 759.529627] EXT4-fs: 1914 callbacks suppressed [ 759.529637] EXT4-fs (sda1): re-mounted. Opts: [ 759.541141] EXT4-fs (sda1): re-mounted. Opts: [ 759.546139] EXT4-fs (sda1): re-mounted. Opts: [ 759.550943] EXT4-fs (sda1): re-mounted. Opts: [ 759.555710] EXT4-fs (sda1): re-mounted. Opts: [ 759.560567] EXT4-fs (sda1): re-mounted. Opts: [ 759.565420] EXT4-fs (sda1): re-mounted. Opts: [ 759.570186] EXT4-fs (sda1): re-mounted. Opts: [ 759.576640] EXT4-fs (sda1): re-mounted. Opts: [ 759.581375] EXT4-fs (sda1): re-mounted. Opts: [ 764.531638] EXT4-fs: 1905 callbacks suppressed [ 764.531648] EXT4-fs (sda1): re-mounted. Opts: [ 764.548175] EXT4-fs (sda1): re-mounted. Opts: [ 764.552939] EXT4-fs (sda1): re-mounted. Opts: [ 764.557814] EXT4-fs (sda1): re-mounted. Opts: [ 764.563225] EXT4-fs (sda1): re-mounted. Opts: [ 764.568841] EXT4-fs (sda1): re-mounted. Opts: [ 764.574446] EXT4-fs (sda1): re-mounted. Opts: [ 764.579401] EXT4-fs (sda1): re-mounted. Opts: [ 764.584258] EXT4-fs (sda1): re-mounted. Opts: [ 764.589134] EXT4-fs (sda1): re-mounted. Opts: [ 769.532515] EXT4-fs: 1885 callbacks suppressed [ 769.532525] EXT4-fs (sda1): re-mounted. Opts: [ 769.541992] EXT4-fs (sda1): re-mounted. Opts: [ 769.547500] EXT4-fs (sda1): re-mounted. Opts: [ 769.552485] EXT4-fs (sda1): re-mounted. Opts: [ 769.557620] EXT4-fs (sda1): re-mounted. Opts: [ 769.564009] EXT4-fs (sda1): re-mounted. Opts: [ 769.569117] EXT4-fs (sda1): re-mounted. Opts: [ 769.573904] EXT4-fs (sda1): re-mounted. Opts: [ 769.578800] EXT4-fs (sda1): re-mounted. Opts: [ 769.583623] EXT4-fs (sda1): re-mounted. Opts: [ 774.536765] EXT4-fs: 1915 callbacks suppressed [ 774.536774] EXT4-fs (sda1): re-mounted. Opts: [ 774.546427] EXT4-fs (sda1): re-mounted. Opts: [ 774.554754] EXT4-fs (sda1): re-mounted. Opts: [ 774.560378] EXT4-fs (sda1): re-mounted. Opts: [ 774.565323] EXT4-fs (sda1): re-mounted. Opts: [ 774.571593] EXT4-fs (sda1): re-mounted. Opts: [ 774.577452] EXT4-fs (sda1): re-mounted. Opts: [ 774.582326] EXT4-fs (sda1): re-mounted. Opts: [ 774.587180] EXT4-fs (sda1): re-mounted. Opts: [ 774.592111] EXT4-fs (sda1): re-mounted. Opts: [ 779.537928] EXT4-fs: 1927 callbacks suppressed [ 779.537942] EXT4-fs (sda1): re-mounted. Opts: [ 779.547540] EXT4-fs (sda1): re-mounted. Opts: [ 779.554876] EXT4-fs (sda1): re-mounted. Opts: [ 779.559666] EXT4-fs (sda1): re-mounted. Opts: [ 779.564641] EXT4-fs (sda1): re-mounted. Opts: [ 779.569578] EXT4-fs (sda1): re-mounted. Opts: [ 779.574569] EXT4-fs (sda1): re-mounted. Opts: [ 779.579619] EXT4-fs (sda1): re-mounted. Opts: [ 779.584540] EXT4-fs (sda1): re-mounted. Opts: [ 779.591687] EXT4-fs (sda1): re-mounted. Opts: [ 784.539799] EXT4-fs: 1899 callbacks suppressed [ 784.539808] EXT4-fs (sda1): re-mounted. Opts: [ 784.549585] EXT4-fs (sda1): re-mounted. Opts: [ 784.554642] EXT4-fs (sda1): re-mounted. Opts: [ 784.559809] EXT4-fs (sda1): re-mounted. Opts: [ 784.564639] EXT4-fs (sda1): re-mounted. Opts: [ 784.573537] EXT4-fs (sda1): re-mounted. Opts: [ 784.578578] EXT4-fs (sda1): re-mounted. Opts: [ 784.583462] EXT4-fs (sda1): re-mounted. Opts: [ 784.589216] EXT4-fs (sda1): re-mounted. Opts: [ 784.594818] EXT4-fs (sda1): re-mounted. Opts: [ 789.545734] EXT4-fs: 1917 callbacks suppressed [ 789.545744] EXT4-fs (sda1): re-mounted. Opts: [ 789.555918] EXT4-fs (sda1): re-mounted. Opts: [ 789.560815] EXT4-fs (sda1): re-mounted. Opts: [ 789.565566] EXT4-fs (sda1): re-mounted. Opts: [ 789.572922] EXT4-fs (sda1): re-mounted. Opts: [ 789.577933] EXT4-fs (sda1): re-mounted. Opts: [ 789.582750] EXT4-fs (sda1): re-mounted. Opts: [ 789.587499] EXT4-fs (sda1): re-mounted. Opts: [ 789.592384] EXT4-fs (sda1): re-mounted. Opts: [ 789.597235] EXT4-fs (sda1): re-mounted. Opts: [ 916.328023] INFO: rcu_sched self-detected stall on CPU [ 916.333444] 0-...!: (124998 ticks this GP) idle=59a/1/4611686018427387906 softirq=99006/99006 fqs=0 [ 916.342988] (t=125000 jiffies g=50394 c=50393 q=32) [ 916.348191] rcu_sched kthread starved for 125000 jiffies! g50394 c50393 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 916.358748] RCU grace-period kthread stack dump: [ 916.363501] rcu_sched R running task 23896 9 2 0x80000000 [ 916.370753] Call Trace: [ 916.373429] __schedule+0x801/0x1e30 [ 916.377195] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 916.382215] ? __sched_text_start+0x8/0x8 [ 916.386359] ? _cond_resched+0x14/0x30 [ 916.390292] ? rcu_gp_init+0x83f/0x1060 [ 916.394268] ? add_timer_on+0xa50/0xa50 [ 916.398239] ? find_held_lock+0x36/0x1c0 [ 916.402303] ? lock_downgrade+0x8e0/0x8e0 [ 916.406449] ? rcu_accelerate_cbs+0x195/0xa60 [ 916.410947] schedule+0xef/0x430 [ 916.414313] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 916.418893] ? __schedule+0x1e30/0x1e30 [ 916.422865] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 916.427877] ? trace_hardirqs_on+0xd/0x10 [ 916.432056] ? prepare_to_swait+0x19b/0x500 [ 916.436376] ? __lockdep_init_map+0x105/0x590 [ 916.440869] ? lockdep_init_map+0x9/0x10 [ 916.444927] ? init_timer_on_stack_key+0xb7/0xe0 [ 916.449706] schedule_timeout+0x138/0x240 [ 916.453849] ? usleep_range+0x180/0x180 [ 916.457820] ? __next_timer_interrupt+0x1a0/0x1a0 [ 916.462668] rcu_gp_kthread+0x6b5/0x1940 [ 916.466746] ? rcu_batches_completed_sched+0x10/0x10 [ 916.471841] ? perf_trace_lock+0x3a1/0x900 [ 916.476079] ? pick_next_task_fair+0x97c/0x1780 [ 916.480745] ? graph_lock+0x170/0x170 [ 916.484595] ? resched_curr+0x122/0x190 [ 916.488572] ? perf_trace_lock+0x3a0/0x900 [ 916.492810] ? lock_downgrade+0x8e0/0x8e0 [ 916.496955] ? finish_task_switch+0x182/0x840 [ 916.501514] ? kasan_check_read+0x11/0x20 [ 916.505662] ? do_raw_spin_unlock+0x9e/0x2e0 [ 916.510090] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 916.514728] ? compat_start_thread+0x80/0x80 [ 916.519168] ? _raw_spin_unlock_irq+0x27/0x70 [ 916.523923] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 916.528940] ? kasan_check_write+0x14/0x20 [ 916.533172] ? finish_task_switch+0x28b/0x840 [ 916.537668] ? preempt_notifier_register+0x1e0/0x1e0 [ 916.542774] ? lock_repin_lock+0x410/0x410 [ 916.547019] ? __schedule+0x809/0x1e30 [ 916.550914] ? graph_lock+0x170/0x170 [ 916.554715] ? find_held_lock+0x36/0x1c0 [ 916.558781] ? find_held_lock+0x36/0x1c0 [ 916.562852] ? __schedule+0x1e30/0x1e30 [ 916.566824] ? do_raw_spin_unlock+0x9e/0x2e0 [ 916.571227] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 916.575872] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 916.581437] ? parse_args.cold.15+0x1b3/0x1b3 [ 916.585928] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 916.590941] ? trace_hardirqs_on+0xd/0x10 [ 916.595093] kthread+0x345/0x410 [ 916.598460] ? rcu_batches_completed_sched+0x10/0x10 [ 916.603556] ? kthread_bind+0x40/0x40 [ 916.607355] ret_from_fork+0x3a/0x50 [ 916.611077] NMI backtrace for cpu 0 [ 916.614737] CPU: 0 PID: 4536 Comm: syz-executor904 Not tainted 4.17.0-rc6+ #70 [ 916.622086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 916.631431] Call Trace: [ 916.634004] [ 916.636207] dump_stack+0x1b9/0x294 [ 916.639833] ? dump_stack_print_info.cold.2+0x52/0x52 [ 916.645036] ? lock_release+0xa10/0xa10 [ 916.649020] nmi_cpu_backtrace.cold.4+0x19/0xce [ 916.653757] ? lapic_can_unplug_cpu.cold.26+0x3f/0x3f [ 916.658951] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 916.664245] arch_trigger_cpumask_backtrace+0x14/0x20 [ 916.669437] rcu_dump_cpu_stacks+0x175/0x1c2 [ 916.673847] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 916.678870] check_cpu_stall.isra.61.cold.80+0x36c/0x59a [ 916.684331] ? print_other_cpu_stall+0x4a0/0x4a0 [ 916.689098] ? debug_check_no_locks_freed+0x310/0x310 [ 916.694285] ? find_held_lock+0x36/0x1c0 [ 916.698354] ? lock_downgrade+0x8e0/0x8e0 [ 916.702501] ? lock_release+0xa10/0xa10 [ 916.706476] ? graph_lock+0x170/0x170 [ 916.710277] ? graph_lock+0x170/0x170 [ 916.714077] ? graph_lock+0x170/0x170 [ 916.717877] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 916.723471] ? pvclock_gtod_notify+0x2db/0x3c0 [ 916.728058] ? graph_lock+0x170/0x170 [ 916.731853] ? graph_lock+0x170/0x170 [ 916.735665] ? __lock_is_held+0xb5/0x140 [ 916.739742] rcu_check_callbacks+0x21b/0xad0 [ 916.744153] ? rcu_cpu_stall_reset+0x210/0x210 [ 916.748732] ? trace_hardirqs_off+0xd/0x10 [ 916.753000] ? raise_softirq+0x1b2/0x450 [ 916.757063] ? raise_softirq_irqoff+0x310/0x310 [ 916.761734] ? account_guest_time+0x3d0/0x3d0 [ 916.766228] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 916.771788] ? hrtimer_run_queues+0x70/0x390 [ 916.776195] ? run_local_timers+0x168/0x1d0 [ 916.780512] ? timer_clear_idle+0x50/0x50 [ 916.784659] ? account_system_time+0x7f/0xb0 [ 916.789064] ? account_process_tick+0x76/0x240 [ 916.793653] update_process_times+0x2d/0x70 [ 916.798173] tick_sched_handle+0x9f/0x180 [ 916.802322] tick_sched_timer+0x45/0x130 [ 916.806384] __hrtimer_run_queues+0x3e3/0x10a0 [ 916.811526] ? tick_sched_do_timer+0x1a0/0x1a0 [ 916.816112] ? hrtimer_start_range_ns+0xd10/0xd10 [ 916.821038] ? pvclock_read_flags+0x160/0x160 [ 916.825529] ? kvm_clock_read+0x25/0x30 [ 916.829499] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 916.834513] ? kvm_clock_read+0x25/0x30 [ 916.838485] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 916.843496] ? ktime_get_update_offsets_now+0x3d3/0x5c0 [ 916.848858] ? do_timer+0x50/0x50 [ 916.852309] ? rcu_nmi_exit+0xd7/0x2b0 [ 916.856203] ? do_raw_spin_lock+0xc1/0x200 [ 916.860442] hrtimer_interrupt+0x2f3/0x750 [ 916.864687] smp_apic_timer_interrupt+0x15d/0x710 [ 916.869526] ? smp_call_function_single_interrupt+0x650/0x650 [ 916.875404] ? _raw_spin_lock+0x32/0x40 [ 916.879375] ? _raw_spin_unlock+0x22/0x30 [ 916.883530] ? handle_edge_irq+0x330/0x870 [ 916.887761] ? task_prio+0x50/0x50 [ 916.891329] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 916.896175] apic_timer_interrupt+0xf/0x20 [ 916.900398] [ 916.902676] RIP: 0010:d_walk+0x840/0xc80 [ 916.906726] RSP: 0018:ffff8801ae0ff9f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 916.914439] RAX: ffff8801acfb6340 RBX: 0000000000000293 RCX: 1ffff100359f6d7d [ 916.921706] RDX: 0000000000000000 RSI: ffffffff81c6691b RDI: 0000000000000293 [ 916.928966] RBP: ffff8801ae0ffb78 R08: ffff8801acfb6b78 R09: 0000000000000006 [ 916.936226] R10: ffff8801acfb6340 R11: 0000000000000000 R12: 0000000000000200 [ 916.943488] R13: dffffc0000000000 R14: 1ffff10035c1ff82 R15: ffff8801ae0ffb50 [ 916.950766] ? d_walk+0x83b/0xc80 [ 916.954225] ? d_shrink_del+0x3b0/0x3b0 [ 916.958195] ? dget_parent+0x680/0x680 [ 916.962077] ? shrink_dentry_list+0x5a8/0x7c0 [ 916.966568] ? retint_kernel+0x10/0x10 [ 916.970455] ? is_subdir+0x480/0x480 [ 916.974163] ? shrink_dcache_parent+0x199/0x230 [ 916.978836] ? audit_kill_trees+0x430/0x430 [ 916.983157] shrink_dcache_parent+0x179/0x230 [ 916.987652] ? path_has_submounts+0x1a0/0x1a0 [ 916.992143] ? down_write+0x87/0x120 [ 916.995854] ? vfs_rmdir+0xe0/0x470 [ 916.999476] ? down_read+0x1b0/0x1b0 [ 917.003279] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 917.008900] ? security_inode_rmdir+0xf4/0x130 [ 917.013479] vfs_rmdir+0x202/0x470 [ 917.017016] do_rmdir+0x523/0x610 [ 917.020470] ? __ia32_sys_mkdir+0x80/0x80 [ 917.024616] ? exit_to_usermode_loop+0x87/0x310 [ 917.029294] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 917.034829] ? exit_to_usermode_loop+0x1ef/0x310 [ 917.039586] ? do_syscall_64+0x92/0x800 [ 917.043558] __x64_sys_rmdir+0x36/0x40 [ 917.047439] do_syscall_64+0x1b1/0x800 [ 917.051321] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 917.056161] ? syscall_return_slowpath+0x5c0/0x5c0 [ 917.061087] ? syscall_return_slowpath+0x30f/0x5c0 [ 917.066013] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 917.071379] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 917.076224] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 917.081406] RIP: 0033:0x441837 [ 917.084586] RSP: 002b:00007ffc2d96b798 EFLAGS: 00000207 ORIG_RAX: 0000000000000054 [ 917.092310] RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000441837 [ 917.099571] RDX: 0000000000000000 RSI: 00000000006cd858 RDI: 00007ffc2d96c880 [ 917.106833] RBP: 00007ffc2d96c880 R08: 0000000000000000 R09: 0000000000000001 [ 917.114094] R10: 0000000000000006 R11: 0000000000000207 R12: 00000000016928a0 [ 917.121355] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000