[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.815285] 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: [ 28.085408] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.481052] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.158656] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 29.340539] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 34.929780] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 35.016290] BUG: unable to handle kernel paging request at ffffeafff8d60008 [ 35.023696] IP: [] page_remove_rmap+0x2e/0x260 [ 35.029950] PGD 0 [ 35.032193] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.037161] Dumping ftrace buffer: [ 35.040680] (ftrace buffer empty) [ 35.044370] Modules linked in: [ 35.047656] CPU: 1 PID: 3843 Comm: syz-executor019 Not tainted 4.4.148-gf057ff9 #81 [ 35.055421] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.064767] task: ffff8801c6e2c800 task.stack: ffff8801c8fc0000 [ 35.070804] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.079568] RSP: 0018:ffff8801c8fc79c0 EFLAGS: 00010246 [ 35.085106] RAX: dffffc0000000000 RBX: ffffeafff8d60000 RCX: 0000000000000000 [ 35.092353] RDX: 1ffffd5fff1ac001 RSI: ffffffff814bc75f RDI: ffffeafff8d60008 [ 35.099603] RBP: ffff8801c8fc79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.106928] R10: 0000000000000001 R11: ffff8801c6e2c800 R12: 0000000000000001 [ 35.114179] R13: 1ffff100391f8f3e R14: ffff8801cd59f800 R15: ffffeafff8d60000 [ 35.121535] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.129823] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.135687] CR2: ffffeafff8d60008 CR3: 00000001cc763000 CR4: 00000000001606f0 [ 35.142932] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.150175] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.157416] Stack: [ 35.159538] ffff8801c8fc7c50 0000000000000001 ffff8801c8fc7a78 ffffffff8150a1f3 [ 35.167522] 00003ffe358001e0 00003ffe358001e0 0000000041b58ab3 ffffffff841ef82f [ 35.175507] ffffffff81509ff0 00000000000004f0 ffff8801ca3a59a0 ffff8801c8fc7a40 [ 35.183488] Call Trace: [ 35.186112] [] zap_huge_pmd+0x203/0x510 [ 35.191717] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.198274] [] unmap_single_vma+0xea3/0x1240 [ 35.204307] [] ? vm_normal_page+0x230/0x230 [ 35.210259] [] ? __put_single_page+0x60/0x60 [ 35.216295] [] unmap_vmas+0x81/0xd0 [ 35.221546] [] exit_mmap+0x1c9/0x3a0 [ 35.226886] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.233353] [] ? up_write+0x1a/0x60 [ 35.238606] [] mmput+0xf8/0x2d0 [ 35.243507] [] do_exit+0x8d8/0x26b0 [ 35.248763] [] ? file_map_prot_check+0x193/0x310 [ 35.255143] [] ? release_task.part.17+0x1200/0x1200 [ 35.261782] [] ? SyS_mprotect+0x41e/0x640 [ 35.267557] [] ? up_write+0x1a/0x60 [ 35.272808] [] ? SyS_mprotect+0x423/0x640 [ 35.278580] [] do_group_exit+0x111/0x330 [ 35.284271] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.290742] [] SyS_exit_group+0x1d/0x20 [ 35.296346] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.302946] 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 [ 35.329823] RIP [] page_remove_rmap+0x2e/0x260 [ 35.336161] RSP [ 35.339757] CR2: ffffeafff8d60008 [ 35.343230] ---[ end trace e112dc16fd7a7686 ]--- [ 35.348141] Kernel panic - not syncing: Fatal exception [ 35.353930] Dumping ftrace buffer: [ 35.357453] (ftrace buffer empty) [ 35.361143] Kernel Offset: disabled [ 35.364747] Rebooting in 86400 seconds..