[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.401896] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.974003] random: sshd: uninitialized urandom read (32 bytes read) [ 21.376860] random: sshd: uninitialized urandom read (32 bytes read) [ 21.879350] random: sshd: uninitialized urandom read (32 bytes read) [ 22.028345] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 27.641441] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.721668] BUG: unable to handle kernel paging request at ffffeafff9180020 [ 27.729221] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.735506] PGD 0 [ 27.737481] [ 27.739145] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.743641] Dumping ftrace buffer: [ 27.747170] (ftrace buffer empty) [ 27.750997] Modules linked in: [ 27.754312] CPU: 1 PID: 3798 Comm: syz-executor198 Not tainted 4.9.122-g54068d6 #26 [ 27.762097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.771607] task: ffff8801b7b69800 task.stack: ffff8801b6218000 [ 27.777653] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.786471] RSP: 0018:ffff8801b621f948 EFLAGS: 00010246 [ 27.792223] RAX: dffffc0000000000 RBX: ffffeafff9180000 RCX: 0000000000000000 [ 27.799708] RDX: 1ffffd5fff230004 RSI: ffffffff814f5918 RDI: ffffeafff9180000 [ 27.807101] RBP: ffff8801b621f970 R08: 00000000000340c0 R09: 0000000000000001 [ 27.814387] R10: ffff8801b7b69800 R11: 0000000000000001 R12: ffff8801b621fc08 [ 27.821650] R13: ffffeafff9180020 R14: ffffeafff9180000 R15: 0000000000000001 [ 27.829092] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.837335] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.843210] CR2: ffffeafff9180020 CR3: 00000001b7ade000 CR4: 00000000001606f0 [ 27.850476] Stack: [ 27.852616] ffffeafff9180020 ffff8801b621fc08 ffff8801b8a92800 ffffeafff9180000 [ 27.860710] ffff8801b6200c08 ffff8801b621f9c8 ffffffff8154cb8f ffff8801b621fc18 [ 27.868940] ffff8801b621fc10 ffff8801b621fc88 00003ffe460001e0 00000001b8a92000 [ 27.877512] Call Trace: [ 27.880100] [] zap_huge_pmd+0x16f/0x860 [ 27.885736] [] unmap_page_range+0x12ad/0x1730 [ 27.891871] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.898299] [] unmap_single_vma+0x101/0x260 [ 27.904662] [] unmap_vmas+0x102/0x1d0 [ 27.910106] [] exit_mmap+0x214/0x3f0 [ 27.915586] [] ? SyS_munmap+0xa0/0xa0 [ 27.921034] [] ? up_write+0x1a/0x60 [ 27.926302] [] mmput+0xf3/0x2d0 [ 27.931224] [] do_exit+0x906/0x27b0 [ 27.936491] [] ? release_task.part.19+0x1210/0x1210 [ 27.943161] [] ? up_write+0x1a/0x60 [ 27.948565] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.954919] [] ? mprotect_fixup+0x930/0x930 [ 27.960900] [] do_group_exit+0x111/0x340 [ 27.966600] [] ? do_group_exit+0x340/0x340 [ 27.972474] [] SyS_exit_group+0x1d/0x20 [ 27.978290] [] do_syscall_64+0x1a6/0x490 [ 27.984087] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.991016] Code: 55 41 54 53 48 89 fb e8 58 b4 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 23 b4 e6 [ 28.019027] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.025438] RSP [ 28.029047] CR2: ffffeafff9180020 [ 28.032615] ---[ end trace fe66447c71276ee7 ]--- [ 28.037482] Kernel panic - not syncing: Fatal exception [ 28.043332] Dumping ftrace buffer: [ 28.046870] (ftrace buffer empty) [ 28.050569] Kernel Offset: disabled [ 28.054186] Rebooting in 86400 seconds..