[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.559426] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.249988] random: sshd: uninitialized urandom read (32 bytes read) [ 20.674618] random: sshd: uninitialized urandom read (32 bytes read) [ 21.544771] random: sshd: uninitialized urandom read (32 bytes read) [ 72.542067] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 78.064246] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 78.190099] ------------[ cut here ]------------ [ 78.194890] WARNING: CPU: 0 PID: 3851 at lib/debugobjects.c:263 debug_print_object+0x181/0x210 [ 78.203619] ODEBUG: free active (active state 0) object type: work_struct hint: p9_read_work+0x0/0xac0 [ 78.213039] Kernel panic - not syncing: panic_on_warn set ... [ 78.213039] [ 78.220381] CPU: 0 PID: 3851 Comm: syz-executor720 Not tainted 4.9.111-g03c70fe #10 [ 78.228156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.238297] ffff8801d8e674f0 ffffffff81eb2729 ffffffff83c48980 00000000ffffffff [ 78.246299] 0000000000000000 0000000000000000 0000000000000107 ffff8801d8e675b0 [ 78.254291] ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836 [ 78.262303] Call Trace: [ 78.264876] [] dump_stack+0xc1/0x128 [ 78.270212] [] panic+0x1bf/0x3bc [ 78.275199] [] ? add_taint.cold.6+0x16/0x16 [ 78.281139] [] ? __warn.cold.9+0xa6/0x17f [ 78.286921] [] ? debug_print_object+0x181/0x210 [ 78.293217] [] __warn.cold.9+0xc1/0x17f [ 78.298815] [] ? __usermodehelper_disable+0x1b0/0x1b0 [ 78.305651] [] warn_slowpath_fmt+0xc2/0x100 [ 78.311598] [] ? __warn+0x50/0x50 [ 78.316686] [] debug_print_object+0x181/0x210 [ 78.322804] [] ? p9_write_work+0x910/0x910 [ 78.328666] [] debug_check_no_obj_freed+0x4fb/0x930 [ 78.335426] [] ? debug_object_activate+0x4e0/0x4e0 [ 78.341984] [] ? kfree+0xdb/0x310 [ 78.347066] [] ? p9_fd_close+0x298/0x330 [ 78.352748] [] ? p9_fd_close+0x298/0x330 [ 78.358541] [] kfree+0x18d/0x310 [ 78.363529] [] p9_fd_close+0x298/0x330 [ 78.369041] [] p9_client_create+0x825/0x10a0 [ 78.375074] [] ? p9_client_zc_rpc.constprop.11+0x1020/0x1020 [ 78.382501] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 78.389327] [] ? bdi_register+0xb4/0x570 [ 78.395014] [] ? bdi_init+0x7ae/0xab0 [ 78.400439] [] v9fs_session_init+0x333/0x13a0 [ 78.406559] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 78.413461] [] ? debug_check_no_obj_freed+0x2ec/0x930 [ 78.420275] [] ? v9fs_inode_init_once+0x30/0x30 [ 78.426582] [] ? debug_object_activate+0x4e0/0x4e0 [ 78.433143] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 78.439963] [] ? free_hot_cold_page+0x493/0x840 [ 78.446255] [] ? check_preemption_disabled+0x3b/0x170 [ 78.453088] [] ? kasan_unpoison_shadow+0x35/0x50 [ 78.459468] [] ? kasan_kmalloc+0xc7/0xe0 [ 78.465165] [] ? kmem_cache_alloc_trace+0xfd/0x2b0 [ 78.471716] [] v9fs_mount+0x7d/0x810 [ 78.477062] [] mount_fs+0x28c/0x370 [ 78.482312] [] vfs_kern_mount.part.29+0xd1/0x3d0 [ 78.488700] [] ? ns_capable_common+0x12a/0x150 [ 78.494909] [] do_mount+0x3c9/0x2740 [ 78.500244] [] ? copy_mount_string+0x40/0x40 [ 78.506286] [] ? kasan_unpoison_shadow+0x35/0x50 [ 78.512660] [] ? kasan_kmalloc+0xc7/0xe0 [ 78.518343] [] ? kmem_cache_alloc_trace+0xfd/0x2b0 [ 78.524898] [] ? copy_mount_options+0x5f/0x320 [ 78.531109] [] ? copy_mount_options+0x1e5/0x320 [ 78.537398] [] compat_SyS_mount+0x4fc/0xff0 [ 78.543342] [] ? do_fast_syscall_32+0xcf/0x870 [ 78.549546] [] ? compat_SyS_io_submit+0xf0/0xf0 [ 78.555836] [] do_fast_syscall_32+0x2f7/0x870 [ 78.561951] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 78.568587] [] entry_SYSENTER_compat+0x90/0xa2 [ 79.649600] Shutting down cpus with NMI [ 79.654013] Dumping ftrace buffer: [ 79.657740] (ftrace buffer empty) [ 79.661426] Kernel Offset: disabled [ 79.665165] Rebooting in 86400 seconds..