[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.500307] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.755196] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.215913] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.911870] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 77.646512] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 83.198799] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) 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 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 [ 83.530615] BUG: unable to handle kernel paging request at ffffeafff8da0008 [ 83.538161] IP: [] page_remove_rmap+0x2e/0x260 [ 83.544454] PGD 0 [ 83.546723] Oops: 0000 [#1] PREEMPT SMP KASAN [ 83.551773] Dumping ftrace buffer: [ 83.555306] (ftrace buffer empty) [ 83.559038] Modules linked in: [ 83.562356] CPU: 0 PID: 4209 Comm: syz-executor635 Not tainted 4.4.148-gf057ff9 #81 [ 83.570150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 [ 83.579506] task: ffff8801d8b19800 task.stack: ffff8801d8aa8000 [ 83.585555] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 83.594270] RSP: 0018:ffff8801d8aaf720 EFLAGS: 00010246 [ 83.599712] RAX: dffffc0000000000 RBX: ffffeafff8da0000 RCX: 0000000000000000 [ 83.606976] RDX: 1ffffd5fff1b4001 RSI: ffffffff814bc75f RDI: ffffeafff8da0008 [ 83.614239] RBP: ffff8801d8aaf730 R08: ffffffff85333170 R09: 0000000000000000 [ 83.621510] R10: 0000000000000001 R11: ffff8801d8b19800 R12: 0000000000000001 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 [ 83.628773] R13: 1ffff1003b155eea R14: ffff8800b04a0800 R15: ffffeafff8da0000 [ 83.636038] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 83.644259] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 83.650147] CR2: ffffeafff8da0008 CR3: 00000000b1a94000 CR4: 00000000001606f0 [ 83.657417] Stack: [ 83.659560] ffff8801d8aaf9b0 0000000000000001 ffff8801d8aaf7d8 ffffffff8150a1f3 [ 83.667624] 00003ffe368001e0 00003ffe368001e0 0000000041b58ab3 ffffffff841ef82f 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 [ 83.675697] ffffffff81509ff0 00000000000004f0 ffff8801d98ed210 ffff8801d8aaf7a0 [ 83.683754] Call Trace: [ 83.686862] [] zap_huge_pmd+0x203/0x510 [ 83.692506] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 83.699090] [] unmap_single_vma+0xea3/0x1240 [ 83.705159] [] ? vm_normal_page+0x230/0x230 [ 83.711146] [] ? __put_single_page+0x60/0x60 [ 83.717376] [] unmap_vmas+0x81/0xd0 [ 83.722655] [] exit_mmap+0x1c9/0x3a0 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 [ 83.728024] [] ? SyS_remap_file_pages+0x870/0x870 [ 83.734521] [] ? up_write+0x1a/0x60 [ 83.739794] [] mmput+0xf8/0x2d0 [ 83.744724] [] do_exit+0x8d8/0x26b0 [ 83.750004] [] ? debug_check_no_locks_freed+0x210/0x210 [ 83.757022] [] ? release_task.part.17+0x1200/0x1200 [ 83.763689] [] ? save_stack+0xa9/0xd0 [ 83.769158] [] ? save_stack_trace+0x26/0x50 [ 83.775146] [] ? save_stack+0x43/0xd0 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 [ 83.780604] [] ? recalc_sigpending+0x76/0xa0 [ 83.786664] [] do_group_exit+0x111/0x330 [ 83.792376] [] get_signal+0x4ec/0x14b0 [ 83.797930] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 83.804858] [] do_signal+0x8b/0x1d30 [ 83.810233] [] ? setup_sigcontext+0x780/0x780 [ 83.816380] [] ? putname+0xdb/0x110 [ 83.821659] [] ? rcu_read_lock_sched_held+0x103/0x120 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 [ 83.828497] [] ? kmem_cache_free+0x2b4/0x340 [ 83.834563] [] ? SyS_futex+0x1f8/0x300 [ 83.840104] [] ? exit_to_usermode_loop+0xe4/0x160 [ 83.846617] [] exit_to_usermode_loop+0x11a/0x160 [ 83.853029] [] syscall_return_slowpath+0x1b5/0x1f0 [ 83.859675] [] int_ret_from_sys_call+0x25/0xa3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 83.865895] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 83.893981] RIP [] page_remove_rmap+0x2e/0x260 [ 83.900351] RSP [ 83.903973] CR2: ffffeafff8da0008 [ 83.907428] ---[ end trace b546ed49585ad200 ]--- [ 83.912184] Kernel panic - not syncing: Fatal exception [ 83.917891] Dumping ftrace buffer: [ 83.921573] (ftrace buffer empty) [ 83.925267] Kernel Offset: disabled [ 83.928870] Rebooting in 86400 seconds..