[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.860431] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.134111] random: sshd: uninitialized urandom read (32 bytes read) [ 18.421568] random: sshd: uninitialized urandom read (32 bytes read) [ 18.945378] random: sshd: uninitialized urandom read (32 bytes read) [ 19.153211] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. [ 24.835456] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.915974] BUG: unable to handle kernel paging request at ffffeafff9140020 [ 24.923334] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.929599] PGD 0 [ 24.931588] [ 24.933225] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.937695] Dumping ftrace buffer: [ 24.941258] (ftrace buffer empty) [ 24.944957] Modules linked in: [ 24.948249] CPU: 1 PID: 3790 Comm: syz-executor740 Not tainted 4.9.120-gf85543b #24 [ 24.956022] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.965355] task: ffff8801b8658000 task.stack: ffff8801b6760000 [ 24.971390] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.980124] RSP: 0018:ffff8801b6767948 EFLAGS: 00010246 [ 24.985549] RAX: dffffc0000000000 RBX: ffffeafff9140000 RCX: 0000000000000000 [ 24.992800] RDX: 1ffffd5fff228004 RSI: ffffffff814f5128 RDI: ffffeafff9140000 [ 25.000068] RBP: ffff8801b6767970 R08: 0000000000033bc0 R09: 0000000000000001 [ 25.007318] R10: ffff8801b8658000 R11: 0000000000000001 R12: ffff8801b6767c08 [ 25.014569] R13: ffffeafff9140020 R14: ffffeafff9140000 R15: 0000000000000001 [ 25.021861] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.030069] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.035926] CR2: ffffeafff9140020 CR3: 00000001b84b3000 CR4: 00000000001606f0 [ 25.043175] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.050425] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.057675] Stack: [ 25.059806] ffffeafff9140020 ffff8801b6767c08 ffff8801ba476800 ffffeafff9140000 [ 25.067927] ffff8801b6adc898 ffff8801b67679c8 ffffffff8154bfcf ffff8801b6767c18 [ 25.075938] ffff8801b6767c10 ffff8801b6767c88 00003ffe450001e0 00000001ba476000 [ 25.083939] Call Trace: [ 25.086572] [] zap_huge_pmd+0x16f/0x860 [ 25.092270] [] unmap_page_range+0x12ad/0x1730 [ 25.098514] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.105028] [] unmap_single_vma+0x101/0x260 [ 25.110988] [] unmap_vmas+0x102/0x1d0 [ 25.116421] [] exit_mmap+0x214/0x3f0 [ 25.121763] [] ? SyS_munmap+0xa0/0xa0 [ 25.127190] [] ? up_write+0x1a/0x60 [ 25.132450] [] mmput+0xf3/0x2d0 [ 25.137459] [] do_exit+0x906/0x27b0 [ 25.142787] [] ? release_task.part.19+0x1210/0x1210 [ 25.149436] [] ? up_write+0x1a/0x60 [ 25.154696] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.160872] [] ? mprotect_fixup+0x930/0x930 [ 25.166830] [] do_group_exit+0x111/0x340 [ 25.172621] [] ? do_group_exit+0x340/0x340 [ 25.178488] [] SyS_exit_group+0x1d/0x20 [ 25.184192] [] do_syscall_64+0x1a6/0x490 [ 25.189922] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.196940] 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 [ 25.224078] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.230418] RSP [ 25.234021] CR2: ffffeafff9140020 [ 25.237454] ---[ end trace 91faa35bea60e21a ]--- [ 25.242195] Kernel panic - not syncing: Fatal exception [ 25.247883] Dumping ftrace buffer: [ 25.251400] (ftrace buffer empty) [ 25.255109] Kernel Offset: disabled [ 25.258722] Rebooting in 86400 seconds..