[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.571704] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.071916] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.330110] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.017941] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 23.199968] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 28.697589] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 28.785615] BUG: unable to handle kernel paging request at ffffeafff8d68008 [ 28.793304] IP: [] page_remove_rmap+0x2e/0x260 [ 28.799888] PGD 0 [ 28.802161] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.807224] Dumping ftrace buffer: [ 28.810773] (ftrace buffer empty) [ 28.814520] Modules linked in: [ 28.817832] CPU: 0 PID: 3840 Comm: syz-executor222 Not tainted 4.4.148-gf057ff9 #81 [ 28.825688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.835035] task: ffff8800bb34c800 task.stack: ffff8801d4190000 [ 28.841137] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.850068] RSP: 0018:ffff8801d41979c0 EFLAGS: 00010246 [ 28.855598] RAX: dffffc0000000000 RBX: ffffeafff8d68000 RCX: 0000000000000000 [ 28.863018] RDX: 1ffffd5fff1ad001 RSI: ffffffff814bc75f RDI: ffffeafff8d68008 [ 28.870420] RBP: ffff8801d41979d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.877824] R10: 0000000000000001 R11: ffff8800bb34c800 R12: 0000000000000001 [ 28.885087] R13: 1ffff1003a832f3e R14: ffff8801cdf79800 R15: ffffeafff8d68000 [ 28.892410] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.900624] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.906517] CR2: ffffeafff8d68008 CR3: 00000001cecff000 CR4: 00000000001606f0 [ 28.913827] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.921138] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.928395] Stack: [ 28.930533] ffff8801d4197c50 0000000000000001 ffff8801d4197a78 ffffffff8150a1f3 [ 28.938591] 00003ffe35a001e0 00003ffe35a001e0 0000000041b58ab3 ffffffff841ef82f [ 28.946927] ffffffff81509ff0 00000000000004f0 ffff8801d1ccc7e8 ffff8801d4197a40 [ 28.955005] Call Trace: [ 28.957583] [] zap_huge_pmd+0x203/0x510 [ 28.963196] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.969762] [] unmap_single_vma+0xea3/0x1240 [ 28.975806] [] ? vm_normal_page+0x230/0x230 [ 28.981765] [] ? __put_single_page+0x60/0x60 [ 28.987865] [] unmap_vmas+0x81/0xd0 [ 28.993192] [] exit_mmap+0x1c9/0x3a0 [ 28.998552] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.005091] [] ? up_write+0x1a/0x60 [ 29.010415] [] mmput+0xf8/0x2d0 [ 29.015332] [] do_exit+0x8d8/0x26b0 [ 29.020599] [] ? file_map_prot_check+0x193/0x310 [ 29.026992] [] ? release_task.part.17+0x1200/0x1200 [ 29.033654] [] ? SyS_mprotect+0x41e/0x640 [ 29.039438] [] ? up_write+0x1a/0x60 [ 29.044722] [] ? SyS_mprotect+0x423/0x640 [ 29.050526] [] do_group_exit+0x111/0x330 [ 29.056281] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.062810] [] SyS_exit_group+0x1d/0x20 [ 29.068439] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.075001] 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 [ 29.102974] RIP [] page_remove_rmap+0x2e/0x260 [ 29.109381] RSP [ 29.112991] CR2: ffffeafff8d68008 [ 29.116430] ---[ end trace 3cc5f95603cf17fe ]--- [ 29.121176] Kernel panic - not syncing: Fatal exception [ 29.127167] Dumping ftrace buffer: [ 29.130707] (ftrace buffer empty) [ 29.134405] Kernel Offset: disabled [ 29.138019] Rebooting in 86400 seconds..