[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.255867] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.730862] random: sshd: uninitialized urandom read (32 bytes read) [ 22.155677] random: sshd: uninitialized urandom read (32 bytes read) [ 22.701121] random: sshd: uninitialized urandom read (32 bytes read) [ 22.836470] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 28.354895] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.432011] BUG: unable to handle kernel paging request at ffffeafff8e98020 [ 28.439722] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.445968] PGD 0 [ 28.447914] [ 28.449548] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.454082] Dumping ftrace buffer: [ 28.457608] (ftrace buffer empty) [ 28.461293] Modules linked in: [ 28.464599] CPU: 0 PID: 3799 Comm: syz-executor872 Not tainted 4.9.120-gf85543b #76 [ 28.472365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.481694] task: ffff8801b9f73000 task.stack: ffff8801be8a8000 [ 28.487761] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.496512] RSP: 0018:ffff8801be8af948 EFLAGS: 00010246 [ 28.501962] RAX: dffffc0000000000 RBX: ffffeafff8e98000 RCX: 0000000000000000 [ 28.509222] RDX: 1ffffd5fff1d3004 RSI: ffffffff814f5128 RDI: ffffeafff8e98000 [ 28.516635] RBP: ffff8801be8af970 R08: 0000000000033fe0 R09: 0000000000000001 [ 28.523886] R10: ffff8801b9f73000 R11: 0000000000000001 R12: ffff8801be8afc08 [ 28.531130] R13: ffffeafff8e98020 R14: ffffeafff8e98000 R15: 0000000000000001 [ 28.538380] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.546583] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.552439] CR2: ffffeafff8e98020 CR3: 00000001cb1eb000 CR4: 00000000001606f0 [ 28.559687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.566931] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.574172] Stack: [ 28.576297] ffffeafff8e98020 ffff8801be8afc08 ffff8801c83c5800 ffffeafff8e98000 [ 28.584285] ffff8801c8e4fd68 ffff8801be8af9c8 ffffffff8154bfcf ffff8801be8afc18 [ 28.592279] ffff8801be8afc10 ffff8801be8afc88 00003ffe3a6001e0 00000001c83c5000 [ 28.600293] Call Trace: [ 28.602860] [] zap_huge_pmd+0x16f/0x860 [ 28.608460] [] unmap_page_range+0x12ad/0x1730 [ 28.614692] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.620993] [] unmap_single_vma+0x101/0x260 [ 28.626936] [] unmap_vmas+0x102/0x1d0 [ 28.632358] [] exit_mmap+0x214/0x3f0 [ 28.637693] [] ? SyS_munmap+0xa0/0xa0 [ 28.643234] [] ? up_write+0x1a/0x60 [ 28.648604] [] mmput+0xf3/0x2d0 [ 28.653512] [] do_exit+0x906/0x27b0 [ 28.658767] [] ? release_task.part.19+0x1210/0x1210 [ 28.665413] [] ? up_write+0x1a/0x60 [ 28.670663] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.676931] [] ? mprotect_fixup+0x930/0x930 [ 28.682879] [] ? SyS_pwrite64+0xe8/0x170 [ 28.688566] [] do_group_exit+0x111/0x340 [ 28.694248] [] ? do_group_exit+0x340/0x340 [ 28.700105] [] SyS_exit_group+0x1d/0x20 [ 28.705701] [] do_syscall_64+0x1a6/0x490 [ 28.711385] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.718282] Code: 55 41 54 53 48 89 fb e8 c8 b6 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 93 b6 e6 [ 28.745521] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.751885] RSP [ 28.755485] CR2: ffffeafff8e98020 [ 28.758917] ---[ end trace 6fecfdf71c0c30ef ]--- [ 28.763647] Kernel panic - not syncing: Fatal exception [ 28.769322] Dumping ftrace buffer: [ 28.772838] (ftrace buffer empty) [ 28.776521] Kernel Offset: disabled [ 28.780154] Rebooting in 86400 seconds..