[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.520860] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.900694] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.239425] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.853193] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) [ 23.040420] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 28.596291] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) executing program [ 28.683500] BUG: unable to handle kernel paging request at ffffeafffd3b8008 [ 28.690830] IP: [] page_remove_rmap+0x2e/0x260 [ 28.697077] PGD 0 [ 28.699332] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.704290] Dumping ftrace buffer: [ 28.707800] (ftrace buffer empty) [ 28.711483] Modules linked in: [ 28.714770] CPU: 1 PID: 3834 Comm: syz-executor717 Not tainted 4.4.148-gf057ff9 #81 [ 28.722533] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.731861] task: ffff8801d970b000 task.stack: ffff8801d97d8000 [ 28.737890] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.746580] RSP: 0018:ffff8801d97df9c0 EFLAGS: 00010246 [ 28.752019] RAX: dffffc0000000000 RBX: ffffeafffd3b8000 RCX: 0000000000000000 [ 28.759269] RDX: 1ffffd5fffa77001 RSI: ffffffff814bc75f RDI: ffffeafffd3b8008 [ 28.766541] RBP: ffff8801d97df9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.773785] R10: 0000000000000001 R11: ffff8801d970b000 R12: 0000000000000001 [ 28.781025] R13: 1ffff1003b2fbf3e R14: ffff8800b2ba5800 R15: ffffeafffd3b8000 [ 28.788267] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.796466] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.802352] CR2: ffffeafffd3b8008 CR3: 00000000adaa9000 CR4: 00000000001606f0 [ 28.809613] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.816872] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.824115] Stack: [ 28.826240] ffff8801d97dfc50 0000000000000001 ffff8801d97dfa78 ffffffff8150a1f3 [ 28.834260] 00003fff4ee001e0 00003fff4ee001e0 0000000041b58ab3 ffffffff841ef82f [ 28.842231] ffffffff81509ff0 00000000000004f0 ffff8801d0c24aa8 ffff8801d97dfa40 [ 28.850207] Call Trace: [ 28.852769] [] zap_huge_pmd+0x203/0x510 [ 28.858366] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.864918] [] unmap_single_vma+0xea3/0x1240 [ 28.870947] [] ? vm_normal_page+0x230/0x230 [ 28.876891] [] ? __put_single_page+0x60/0x60 [ 28.882923] [] unmap_vmas+0x81/0xd0 [ 28.888193] [] exit_mmap+0x1c9/0x3a0 [ 28.893534] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.899999] [] ? kmem_cache_free+0x2b4/0x340 [ 28.906031] [] mmput+0xf8/0x2d0 [ 28.910934] [] do_exit+0x8d8/0x26b0 [ 28.916186] [] ? file_map_prot_check+0x193/0x310 [ 28.922567] [] ? release_task.part.17+0x1200/0x1200 [ 28.929203] [] ? SyS_mprotect+0x41e/0x640 [ 28.934977] [] ? up_write+0x1a/0x60 [ 28.940228] [] ? SyS_mprotect+0x423/0x640 [ 28.946001] [] do_group_exit+0x111/0x330 [ 28.951683] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.958161] [] SyS_exit_group+0x1d/0x20 [ 28.963761] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.970309] 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 [ 28.997055] RIP [] page_remove_rmap+0x2e/0x260 [ 29.003392] RSP [ 29.006988] CR2: ffffeafffd3b8008 [ 29.010430] ---[ end trace 1dceb16c8c77fc2d ]--- [ 29.015157] Kernel panic - not syncing: Fatal exception [ 29.020825] Dumping ftrace buffer: [ 29.024361] (ftrace buffer empty) [ 29.028046] Kernel Offset: disabled [ 29.031642] Rebooting in 86400 seconds..