[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.544699] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.438456] random: sshd: uninitialized urandom read (32 bytes read) [ 28.861072] random: sshd: uninitialized urandom read (32 bytes read) [ 29.371019] random: sshd: uninitialized urandom read (32 bytes read) [ 29.520432] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 35.029221] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.118376] BUG: unable to handle kernel paging request at ffffeafff8f10020 [ 35.125777] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.132105] PGD 0 [ 35.134057] [ 35.135677] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.140144] Dumping ftrace buffer: [ 35.143655] (ftrace buffer empty) [ 35.147338] Modules linked in: [ 35.150620] CPU: 0 PID: 3802 Comm: syz-executor397 Not tainted 4.9.122-g54068d6 #26 [ 35.158383] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.167713] task: ffff8801b8a99800 task.stack: ffff8801d9b90000 [ 35.173744] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.182427] RSP: 0018:ffff8801d9b97948 EFLAGS: 00010246 [ 35.187846] RAX: dffffc0000000000 RBX: ffffeafff8f10000 RCX: 0000000000000000 [ 35.195101] RDX: 1ffffd5fff1e2004 RSI: ffffffff814f5918 RDI: ffffeafff8f10000 [ 35.202347] RBP: ffff8801d9b97970 R08: 0000000000034080 R09: 0000000000000001 [ 35.209592] R10: ffff8801b8a99800 R11: 0000000000000001 R12: ffff8801d9b97c08 [ 35.216839] R13: ffffeafff8f10020 R14: ffffeafff8f10000 R15: 0000000000000001 [ 35.224136] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.232387] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.238249] CR2: ffffeafff8f10020 CR3: 00000001c3c64000 CR4: 00000000001606f0 [ 35.245493] Stack: [ 35.247620] ffffeafff8f10020 ffff8801d9b97c08 ffff8801c3e45800 ffffeafff8f10000 [ 35.255601] ffff8801c3d16738 ffff8801d9b979c8 ffffffff8154cb8f ffff8801d9b97c18 [ 35.263586] ffff8801d9b97c10 ffff8801d9b97c88 00003ffe3c4001e0 00000001c3e45000 [ 35.271572] Call Trace: [ 35.274136] [] zap_huge_pmd+0x16f/0x860 [ 35.279737] [] unmap_page_range+0x12ad/0x1730 [ 35.285859] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.292155] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 35.299061] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 35.305877] [] unmap_single_vma+0x101/0x260 [ 35.311822] [] unmap_vmas+0x102/0x1d0 [ 35.317245] [] exit_mmap+0x214/0x3f0 [ 35.322587] [] ? SyS_munmap+0xa0/0xa0 [ 35.328015] [] ? up_write+0x1a/0x60 [ 35.333269] [] mmput+0xf3/0x2d0 [ 35.338177] [] do_exit+0x906/0x27b0 [ 35.343430] [] ? release_task.part.19+0x1210/0x1210 [ 35.350072] [] ? up_write+0x1a/0x60 [ 35.355325] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.361874] [] ? mprotect_fixup+0x930/0x930 [ 35.367825] [] do_group_exit+0x111/0x340 [ 35.373512] [] ? do_group_exit+0x340/0x340 [ 35.379371] [] SyS_exit_group+0x1d/0x20 [ 35.384980] [] do_syscall_64+0x1a6/0x490 [ 35.390667] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.397564] 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 [ 35.424415] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.430754] RSP [ 35.434353] CR2: ffffeafff8f10020 [ 35.437785] ---[ end trace 828c94a607163657 ]--- [ 35.442521] Kernel panic - not syncing: Fatal exception [ 35.448125] Dumping ftrace buffer: [ 35.451641] (ftrace buffer empty) [ 35.455373] Kernel Offset: disabled [ 35.458984] Rebooting in 86400 seconds..