[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.817179] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.206572] random: sshd: uninitialized urandom read (32 bytes read) [ 14.474319] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.039852] random: sshd: uninitialized urandom read (32 bytes read) [ 15.208737] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 20.726122] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.809239] BUG: unable to handle kernel paging request at ffffeafff9108020 [ 20.816606] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.822859] PGD 0 [ 20.824832] [ 20.826453] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.830936] Dumping ftrace buffer: [ 20.834451] (ftrace buffer empty) [ 20.838134] Modules linked in: [ 20.841443] CPU: 1 PID: 3795 Comm: syz-executor943 Not tainted 4.9.121-g681e57b #25 [ 20.849208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.858541] task: ffff8801b79c1800 task.stack: ffff8801b7ed0000 [ 20.864569] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.873274] RSP: 0018:ffff8801b7ed7948 EFLAGS: 00010246 [ 20.878699] RAX: dffffc0000000000 RBX: ffffeafff9108000 RCX: 0000000000000000 [ 20.885941] RDX: 1ffffd5fff221004 RSI: ffffffff814f5278 RDI: ffffeafff9108000 [ 20.893189] RBP: ffff8801b7ed7970 R08: 00000000000345c0 R09: 0000000000000001 [ 20.900444] R10: ffff8801b79c1800 R11: 0000000000000001 R12: ffff8801b7ed7c08 [ 20.907691] R13: ffffeafff9108020 R14: ffffeafff9108000 R15: 0000000000000001 [ 20.914945] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.923145] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.929000] CR2: ffffeafff9108020 CR3: 00000001cabfc000 CR4: 00000000001606f0 [ 20.936268] Stack: [ 20.938393] ffffeafff9108020 ffff8801b7ed7c08 ffff8801b81f8800 ffffeafff9108000 [ 20.946381] ffff8801bf881210 ffff8801b7ed79c8 ffffffff8154c20f ffff8801b7ed7c18 [ 20.954355] ffff8801b7ed7c10 ffff8801b7ed7c88 00003ffe442001e0 00000001b81f8000 [ 20.962336] Call Trace: [ 20.964901] [] zap_huge_pmd+0x16f/0x860 [ 20.970511] [] unmap_page_range+0x12ad/0x1730 [ 20.976662] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 20.982960] [] unmap_single_vma+0x101/0x260 [ 20.988908] [] unmap_vmas+0x102/0x1d0 [ 20.994333] [] exit_mmap+0x214/0x3f0 [ 20.999670] [] ? SyS_munmap+0xa0/0xa0 [ 21.005097] [] ? up_write+0x1a/0x60 [ 21.010348] [] mmput+0xf3/0x2d0 [ 21.015251] [] do_exit+0x906/0x27b0 [ 21.020511] [] ? release_task.part.19+0x1210/0x1210 [ 21.027168] [] ? up_write+0x1a/0x60 [ 21.032419] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.038536] [] ? mprotect_fixup+0x930/0x930 [ 21.044480] [] do_group_exit+0x111/0x340 [ 21.050170] [] ? do_group_exit+0x340/0x340 [ 21.056026] [] SyS_exit_group+0x1d/0x20 [ 21.061624] [] do_syscall_64+0x1a6/0x490 [ 21.067313] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.074211] 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 [ 21.101024] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.107371] RSP [ 21.110970] CR2: ffffeafff9108020 [ 21.114398] ---[ end trace 50fe44118da3a788 ]--- [ 21.119139] Kernel panic - not syncing: Fatal exception [ 21.124777] Dumping ftrace buffer: [ 21.128316] (ftrace buffer empty) [ 21.132000] Kernel Offset: disabled [ 21.135600] Rebooting in 86400 seconds..