[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.118482] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.420338] random: sshd: uninitialized urandom read (32 bytes read) [ 23.811788] random: sshd: uninitialized urandom read (32 bytes read) [ 24.310590] random: sshd: uninitialized urandom read (32 bytes read) [ 24.444344] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 29.966533] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.047947] BUG: unable to handle kernel paging request at ffffeafff8ff0020 [ 30.055304] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.061551] PGD 0 [ 30.063500] [ 30.065122] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.069600] Dumping ftrace buffer: [ 30.073119] (ftrace buffer empty) [ 30.076814] Modules linked in: [ 30.080110] CPU: 0 PID: 3758 Comm: syz-executor508 Not tainted 4.9.122-g54068d6 #26 [ 30.087879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.097215] task: ffff8801bd6c3000 task.stack: ffff8801bc258000 [ 30.103287] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.112029] RSP: 0018:ffff8801bc25f948 EFLAGS: 00010246 [ 30.117462] RAX: dffffc0000000000 RBX: ffffeafff8ff0000 RCX: 0000000000000000 [ 30.124777] RDX: 1ffffd5fff1fe004 RSI: ffffffff814f5918 RDI: ffffeafff8ff0000 [ 30.132030] RBP: ffff8801bc25f970 R08: 0000000000033920 R09: 0000000000000001 [ 30.139373] R10: ffff8801bd6c3000 R11: 0000000000000001 R12: ffff8801bc25fc08 [ 30.146621] R13: ffffeafff8ff0020 R14: ffffeafff8ff0000 R15: 0000000000000001 [ 30.153866] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.162068] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.167926] CR2: ffffeafff8ff0020 CR3: 00000001c1c82000 CR4: 00000000001606f0 [ 30.175242] Stack: [ 30.177382] ffffeafff8ff0020 ffff8801bc25fc08 ffff8801c9bf9800 ffffeafff8ff0000 [ 30.185383] ffff8801bd0975d8 ffff8801bc25f9c8 ffffffff8154cb8f ffff8801bc25fc18 [ 30.193384] ffff8801bc25fc10 ffff8801bc25fc88 00003ffe3fc001e0 00000001c9bf9000 [ 30.201454] Call Trace: [ 30.204023] [] zap_huge_pmd+0x16f/0x860 [ 30.209631] [] unmap_page_range+0x12ad/0x1730 [ 30.215755] [] ? vm_normal_page_pmd+0x310/0x310 [ 30.222171] [] unmap_single_vma+0x101/0x260 [ 30.228124] [] unmap_vmas+0x102/0x1d0 [ 30.233563] [] exit_mmap+0x214/0x3f0 [ 30.238909] [] ? SyS_munmap+0xa0/0xa0 [ 30.244345] [] ? up_write+0x1a/0x60 [ 30.249606] [] mmput+0xf3/0x2d0 [ 30.254515] [] do_exit+0x906/0x27b0 [ 30.259766] [] ? release_task.part.19+0x1210/0x1210 [ 30.266515] [] ? up_write+0x1a/0x60 [ 30.271773] [] ? do_mprotect_pkey+0x71d/0x890 [ 30.277893] [] ? mprotect_fixup+0x930/0x930 [ 30.283841] [] do_group_exit+0x111/0x340 [ 30.289528] [] ? do_group_exit+0x340/0x340 [ 30.295395] [] SyS_exit_group+0x1d/0x20 [ 30.300994] [] do_syscall_64+0x1a6/0x490 [ 30.306686] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.313584] 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 [ 30.340575] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.347007] RSP [ 30.350614] CR2: ffffeafff8ff0020 [ 30.354050] ---[ end trace 4ce291002c9422a8 ]--- [ 30.358777] Kernel panic - not syncing: Fatal exception [ 30.364681] Dumping ftrace buffer: [ 30.368197] (ftrace buffer empty) [ 30.371881] Kernel Offset: disabled [ 30.375481] Rebooting in 86400 seconds..