[ 29.395145] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 30.637897] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.991490] random: sshd: uninitialized urandom read (32 bytes read) [ 31.546402] random: sshd: uninitialized urandom read (32 bytes read) [ 710.205769] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 715.817531] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 715.942129] kauditd_printk_skb: 10 callbacks suppressed [ 715.942138] audit: type=1400 audit(1575813813.037:36): avc: denied { map } for pid=6955 comm="syz-executor778" path="/root/syz-executor778517897" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 1001.440170] INFO: task login:6930 blocked for more than 140 seconds. [ 1001.446932] Not tainted 4.14.158-syzkaller #0 [ 1001.452511] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.460954] login D25920 6930 1 0x80000002 [ 1001.466657] Call Trace: [ 1001.469350] __schedule+0x7b8/0x1cd0 [ 1001.477282] ? firmware_map_remove+0x196/0x196 [ 1001.482027] ? trace_hardirqs_on+0x10/0x10 [ 1001.486265] schedule+0x92/0x1c0 [ 1001.489626] schedule_timeout+0x93b/0xe10 [ 1001.494255] ? __ldsem_down_write_nested+0x2fc/0x7b0 [ 1001.500442] ? find_held_lock+0x35/0x130 [ 1001.504500] ? usleep_range+0x130/0x130 [ 1001.508471] ? __ldsem_down_write_nested+0x2fc/0x7b0 [ 1001.513888] ? mark_held_locks+0xb1/0x100 [ 1001.518033] ? _raw_spin_unlock_irq+0x28/0x90 [ 1001.522810] ? trace_hardirqs_on_caller+0x400/0x590 [ 1001.527834] __ldsem_down_write_nested+0x304/0x7b0 [ 1001.533060] ? __ldsem_down_read_nested+0x5d0/0x5d0 [ 1001.538076] ? __wake_up_common_lock+0xe3/0x160 [ 1001.543087] ldsem_down_write+0x33/0x39 [ 1001.547060] ? ldsem_down_write+0x33/0x39 [ 1001.551641] tty_ldisc_lock+0x1e/0x50 [ 1001.555436] tty_ldisc_hangup+0x1a5/0x5e0 [ 1001.559639] __tty_hangup.part.0+0x2d3/0x6d0 [ 1001.564290] ? tty_read+0x270/0x270 [ 1001.567910] tty_vhangup_session+0x25/0x30 [ 1001.572360] disassociate_ctty.part.0+0x9b/0x6c0 [ 1001.577113] disassociate_ctty+0x78/0x90 [ 1001.581463] do_exit+0x1799/0x2c80 [ 1001.585055] ? security_file_permission+0x89/0x1f0 [ 1001.590042] ? rw_verify_area+0xea/0x2b0 [ 1001.594338] ? mm_update_next_owner+0x5d0/0x5d0 [ 1001.599033] ? vfs_write+0x104/0x500 [ 1001.603669] ? SyS_write+0x15e/0x230 [ 1001.607390] do_group_exit+0x111/0x330 [ 1001.611480] SyS_exit_group+0x1d/0x20 [ 1001.615274] ? do_group_exit+0x330/0x330 [ 1001.619391] do_syscall_64+0x1e8/0x640 [ 1001.623598] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1001.628444] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1001.633852] RIP: 0033:0x7f90c82b51e8 [ 1001.637559] RSP: 002b:00007ffced52ade8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 1001.645472] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f90c82b51e8 [ 1001.652763] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 1001.660255] RBP: 00007f90c858a840 R08: 00000000000000e7 R09: ffffffffffffffa8 [ 1001.667518] R10: 00007f90c8590740 R11: 0000000000000246 R12: 00007f90c858a840 [ 1001.674999] R13: 0000000000000001 R14: 0000000000000001 R15: 000000000060b798 [ 1001.682320] [ 1001.682320] Showing all locks held in the system: [ 1001.688640] 1 lock held by khungtaskd/1045: [ 1001.693099] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f [ 1001.702314] 2 locks held by getty/6927: [ 1001.706283] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.715434] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.724766] 2 locks held by getty/6928: [ 1001.728734] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.737580] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.747866] 2 locks held by getty/6929: [ 1001.751856] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.760559] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.770653] 2 locks held by login/6930: [ 1001.774620] #0: (&tty->legacy_mutex){+.+.}, at: [] tty_lock+0x68/0x80 [ 1001.782987] #1: (&tty->ldisc_sem){++++}, at: [] ldsem_down_write+0x33/0x39 [ 1001.791881] 2 locks held by getty/6931: [ 1001.795854] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.804773] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.814081] 2 locks held by getty/6932: [ 1001.818046] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.826770] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.836099] 2 locks held by getty/6933: [ 1001.840111] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1001.848869] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1001.858334] [ 1001.859967] ============================================= [ 1001.859967] [ 1001.867650] NMI backtrace for cpu 1 [ 1001.871309] CPU: 1 PID: 1045 Comm: khungtaskd Not tainted 4.14.158-syzkaller #0 [ 1001.878746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.888175] Call Trace: [ 1001.890924] dump_stack+0x142/0x197 [ 1001.896404] nmi_cpu_backtrace.cold+0x57/0x94 [ 1001.900953] ? irq_force_complete_move.cold+0x7d/0x7d [ 1001.906137] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 1001.911412] arch_trigger_cpumask_backtrace+0x14/0x20 [ 1001.916727] watchdog+0x5e7/0xb90 [ 1001.920200] kthread+0x319/0x430 [ 1001.923563] ? hungtask_pm_notify+0x50/0x50 [ 1001.927903] ? kthread_create_on_node+0xd0/0xd0 [ 1001.932835] ret_from_fork+0x24/0x30 [ 1001.936625] Sending NMI from CPU 1 to CPUs 0: [ 1001.941680] NMI backtrace for cpu 0 [ 1001.941684] CPU: 0 PID: 7114 Comm: syz-executor778 Not tainted 4.14.158-syzkaller #0 [ 1001.941688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.941690] task: ffff88808460c580 task.stack: ffff888085688000 [ 1001.941692] RIP: 0010:rcu_sched_qs+0x5/0x1b0 [ 1001.941695] RSP: 0018:ffff88808568f850 EFLAGS: 00000082 [ 1001.941700] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88808460ce00 [ 1001.941703] RDX: dffffc0000000000 RSI: ffffffff87f88820 RDI: 0000000000000082 [ 1001.941706] RBP: ffff88808568f858 R08: ffff88808460c580 R09: ffff88808460ce48 [ 1001.941708] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 1001.941711] R13: 000000000002b540 R14: ffff88808460c580 R15: ffff8880aec2b540 [ 1001.941715] FS: 00000000021f2880(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 [ 1001.941717] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.941720] CR2: 0000000001feb000 CR3: 0000000097d81000 CR4: 00000000001406f0 [ 1001.941723] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.941726] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.941728] Call Trace: [ 1001.941730] rcu_note_context_switch+0x3d/0x1600 [ 1001.941732] ? __lock_is_held+0xb6/0x140 [ 1001.941735] ? rmi_f34v7_parse_image_info+0x290/0x1130 [ 1001.941737] __schedule+0x1d2/0x1cd0 [ 1001.941739] ? retint_kernel+0x2d/0x2d [ 1001.941741] ? firmware_map_remove+0x196/0x196 [ 1001.941742] schedule+0x92/0x1c0 [ 1001.941744] paste_selection+0x293/0x3f2 [ 1001.941746] ? find_held_lock+0x35/0x130 [ 1001.941748] ? set_selection+0xe30/0xe30 [ 1001.941750] ? lock_downgrade+0x740/0x740 [ 1001.941752] ? wake_up_q+0xf0/0xf0 [ 1001.941754] tioclinux+0x10e/0x400 [ 1001.941756] vt_ioctl+0x180c/0x2170 [ 1001.941758] ? avc_has_extended_perms+0x8ec/0xe40 [ 1001.941761] ? complete_change_console+0x360/0x360 [ 1001.941763] ? avc_ss_reset+0x110/0x110 [ 1001.941765] ? do_raw_spin_unlock+0x16b/0x260 [ 1001.941767] ? tty_jobctrl_ioctl+0x44/0xc10 [ 1001.941769] ? _raw_spin_unlock+0x2d/0x50 [ 1001.941771] ? complete_change_console+0x360/0x360 [ 1001.941773] tty_ioctl+0x841/0x1320 [ 1001.941775] ? tty_vhangup+0x30/0x30 [ 1001.941777] ? __might_sleep+0x93/0xb0 [ 1001.941779] ? save_trace+0x290/0x290 [ 1001.941781] ? tty_vhangup+0x30/0x30 [ 1001.941783] do_vfs_ioctl+0x7ae/0x1060 [ 1001.941785] ? selinux_file_mprotect+0x5d0/0x5d0 [ 1001.941788] ? ioctl_preallocate+0x1c0/0x1c0 [ 1001.941790] ? lock_downgrade+0x740/0x740 [ 1001.941792] ? security_file_ioctl+0x7d/0xb0 [ 1001.941794] ? security_file_ioctl+0x89/0xb0 [ 1001.941796] SyS_ioctl+0x8f/0xc0 [ 1001.941798] ? do_vfs_ioctl+0x1060/0x1060 [ 1001.941800] do_syscall_64+0x1e8/0x640 [ 1001.941802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1001.941804] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1001.941806] RIP: 0033:0x441239 [ 1001.941808] RSP: 002b:00007fff0d09d828 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.941813] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441239 [ 1001.941816] RDX: 0000000020000080 RSI: 000000000000541c RDI: 0000000000000003 [ 1001.941819] RBP: 00000000000aee71 R08: 000000000000000d R09: 00000000004002c8 [ 1001.941822] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402060 [ 1001.941825] R13: 00000000004020f0 R14: 0000000000000000 R15: 0000000000000000 [ 1001.941826] Code: c1 ea 03 80 3c 02 00 75 07 48 8b 43 58 5b 5d c3 e8 d1 4f 39 00 eb f2 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 <48> 83 ec 08 e8 72 f4 fe ff 85 c0 74 09 80 3d 51 28 5f 07 00 74 [ 1001.942152] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.283054] CPU: 1 PID: 1045 Comm: khungtaskd Not tainted 4.14.158-syzkaller #0 [ 1002.290497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.299840] Call Trace: [ 1002.302425] dump_stack+0x142/0x197 [ 1002.306082] panic+0x1f9/0x42d [ 1002.309261] ? add_taint.cold+0x16/0x16 [ 1002.313228] ? irq_force_complete_move.cold+0x7d/0x7d [ 1002.318412] watchdog+0x5f8/0xb90 [ 1002.321866] kthread+0x319/0x430 [ 1002.325231] ? hungtask_pm_notify+0x50/0x50 [ 1002.329541] ? kthread_create_on_node+0xd0/0xd0 [ 1002.334202] ret_from_fork+0x24/0x30 [ 1002.339551] Kernel Offset: disabled [ 1002.343217] Rebooting in 86400 seconds..