[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.226169] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.357025] random: sshd: uninitialized urandom read (32 bytes read) [ 19.784253] random: sshd: uninitialized urandom read (32 bytes read) [ 20.301727] random: sshd: uninitialized urandom read (32 bytes read) [ 21.980179] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. [ 27.628959] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.707261] BUG: unable to handle kernel paging request at ffffeafff9058020 [ 27.714650] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.720964] PGD 0 [ 27.722915] [ 27.724546] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.729032] Dumping ftrace buffer: [ 27.732545] (ftrace buffer empty) [ 27.736327] Modules linked in: [ 27.739624] CPU: 1 PID: 3769 Comm: syz-executor198 Not tainted 4.9.122-g54068d6 #26 [ 27.747646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.757099] task: ffff8801bcd0c800 task.stack: ffff8801bae08000 [ 27.763129] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.771910] RSP: 0018:ffff8801bae0f948 EFLAGS: 00010246 [ 27.777338] RAX: dffffc0000000000 RBX: ffffeafff9058000 RCX: 0000000000000000 [ 27.784582] RDX: 1ffffd5fff20b004 RSI: ffffffff814f5918 RDI: ffffeafff9058000 [ 27.791826] RBP: ffff8801bae0f970 R08: 0000000000033d60 R09: 0000000000000001 [ 27.799072] R10: ffff8801bcd0c800 R11: 0000000000000001 R12: ffff8801bae0fc08 [ 27.806323] R13: ffffeafff9058020 R14: ffffeafff9058000 R15: 0000000000000001 [ 27.813583] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.821823] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.827773] CR2: ffffeafff9058020 CR3: 00000001c1cc7000 CR4: 00000000001606f0 [ 27.835029] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.842278] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.849524] Stack: [ 27.851649] ffffeafff9058020 ffff8801bae0fc08 ffff8801c1d4a800 ffffeafff9058000 [ 27.859643] ffff8801c2cd4a50 ffff8801bae0f9c8 ffffffff8154cb8f ffff8801bae0fc18 [ 27.867651] ffff8801bae0fc10 ffff8801bae0fc88 00003ffe416001e0 00000001c1d4a000 [ 27.875633] Call Trace: [ 27.878204] [] zap_huge_pmd+0x16f/0x860 [ 27.883999] [] unmap_page_range+0x12ad/0x1730 [ 27.890122] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.896416] [] unmap_single_vma+0x101/0x260 [ 27.902470] [] unmap_vmas+0x102/0x1d0 [ 27.908015] [] exit_mmap+0x214/0x3f0 [ 27.913357] [] ? SyS_munmap+0xa0/0xa0 [ 27.918785] [] mmput+0xf3/0x2d0 [ 27.923689] [] do_exit+0x906/0x27b0 [ 27.928940] [] ? release_task.part.19+0x1210/0x1210 [ 27.935587] [] ? up_write+0x1a/0x60 [ 27.940846] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.946969] [] ? mprotect_fixup+0x930/0x930 [ 27.952961] [] do_group_exit+0x111/0x340 [ 27.958663] [] ? do_group_exit+0x340/0x340 [ 27.964528] [] SyS_exit_group+0x1d/0x20 [ 27.970131] [] do_syscall_64+0x1a6/0x490 [ 27.975826] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.982850] 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 [ 28.010165] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.016568] RSP [ 28.020182] CR2: ffffeafff9058020 [ 28.023616] ---[ end trace fef4314038091521 ]--- [ 28.028349] Kernel panic - not syncing: Fatal exception [ 28.034078] Dumping ftrace buffer: [ 28.037664] (ftrace buffer empty) [ 28.041460] Kernel Offset: disabled [ 28.045068] Rebooting in 86400 seconds..