[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.766161] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.027627] random: sshd: uninitialized urandom read (32 bytes read) [ 19.358305] random: sshd: uninitialized urandom read (32 bytes read) [ 19.871949] random: sshd: uninitialized urandom read (32 bytes read) [ 39.476015] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 45.023818] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 45.110033] BUG: unable to handle kernel paging request at ffffeafff8e18020 [ 45.117513] IP: [] page_remove_rmap+0x37/0x6d0 [ 45.123778] PGD 0 [ 45.125728] [ 45.127354] Oops: 0000 [#1] PREEMPT SMP KASAN [ 45.131828] Dumping ftrace buffer: [ 45.135347] (ftrace buffer empty) [ 45.139041] Modules linked in: [ 45.142339] CPU: 0 PID: 3718 Comm: syz-executor946 Not tainted 4.9.122-g54068d6 #78 [ 45.150110] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.159443] task: ffff8801c1144800 task.stack: ffff8801c06e8000 [ 45.165478] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 45.174164] RSP: 0018:ffff8801c06ef948 EFLAGS: 00010246 [ 45.179597] RAX: dffffc0000000000 RBX: ffffeafff8e18000 RCX: 0000000000000000 [ 45.186848] RDX: 1ffffd5fff1c3004 RSI: ffffffff814f5918 RDI: ffffeafff8e18000 [ 45.194106] RBP: ffff8801c06ef970 R08: 00000000000350a0 R09: 0000000000000001 [ 45.201366] R10: ffff8801c1144800 R11: 0000000000000001 R12: ffff8801c06efc08 [ 45.208622] R13: ffffeafff8e18020 R14: ffffeafff8e18000 R15: 0000000000000001 [ 45.215873] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 45.224078] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.229935] CR2: ffffeafff8e18020 CR3: 00000001c5cab000 CR4: 00000000001606f0 [ 45.237238] Stack: [ 45.239371] ffffeafff8e18020 ffff8801c06efc08 ffff8801c5ecb800 ffffeafff8e18000 [ 45.247374] ffff8801c51a6f78 ffff8801c06ef9c8 ffffffff8154cb8f ffff8801c06efc18 [ 45.255455] ffff8801c06efc10 ffff8801c06efc88 00003ffe386001e0 00000001c5ecb000 [ 45.263513] Call Trace: [ 45.266160] [] zap_huge_pmd+0x16f/0x860 [ 45.271831] [] unmap_page_range+0x12ad/0x1730 [ 45.277960] [] ? vm_normal_page_pmd+0x310/0x310 [ 45.284258] [] unmap_single_vma+0x101/0x260 [ 45.290205] [] unmap_vmas+0x102/0x1d0 [ 45.295634] [] exit_mmap+0x214/0x3f0 [ 45.300974] [] ? SyS_munmap+0xa0/0xa0 [ 45.306402] [] ? up_write+0x1a/0x60 [ 45.311654] [] mmput+0xf3/0x2d0 [ 45.316565] [] do_exit+0x906/0x27b0 [ 45.321820] [] ? release_task.part.19+0x1210/0x1210 [ 45.328561] [] ? up_write+0x1a/0x60 [ 45.333815] [] ? do_mprotect_pkey+0x71d/0x890 [ 45.339935] [] ? mprotect_fixup+0x930/0x930 [ 45.345886] [] do_group_exit+0x111/0x340 [ 45.351586] [] ? do_group_exit+0x340/0x340 [ 45.357459] [] SyS_exit_group+0x1d/0x20 [ 45.363065] [] do_syscall_64+0x1a6/0x490 [ 45.368759] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 45.375661] 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 [ 45.402955] RIP [] page_remove_rmap+0x37/0x6d0 [ 45.409291] RSP [ 45.412891] CR2: ffffeafff8e18020 [ 45.416322] ---[ end trace 36867653f70dd60d ]--- [ 45.421053] Kernel panic - not syncing: Fatal exception [ 45.426719] Dumping ftrace buffer: [ 45.430241] (ftrace buffer empty) [ 45.433934] Kernel Offset: disabled [ 45.437541] Rebooting in 86400 seconds..