[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.231542] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.273904] random: sshd: uninitialized urandom read (32 bytes read) [ 21.499129] random: sshd: uninitialized urandom read (32 bytes read) [ 22.026827] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 27.950896] urandom_read: 1 callbacks suppressed [ 27.950899] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.074029] BUG: unable to handle kernel paging request at ffffeafff8f88020 [ 28.081494] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.087748] PGD 0 [ 28.089740] [ 28.091371] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.095845] Dumping ftrace buffer: [ 28.099427] (ftrace buffer empty) [ 28.103119] Modules linked in: [ 28.106407] CPU: 1 PID: 3804 Comm: syz-executor777 Not tainted 4.9.122-g54068d6 #26 [ 28.114219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.123562] task: ffff8801b6d2b000 task.stack: ffff8801b7480000 [ 28.129642] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.138324] RSP: 0018:ffff8801b7487948 EFLAGS: 00010246 [ 28.143747] RAX: dffffc0000000000 RBX: ffffeafff8f88000 RCX: 0000000000000000 [ 28.150991] RDX: 1ffffd5fff1f1004 RSI: ffffffff814f5918 RDI: ffffeafff8f88000 [ 28.158329] RBP: ffff8801b7487970 R08: 00000000000346a0 R09: 0000000000000001 [ 28.165578] R10: ffff8801b6d2b000 R11: 0000000000000001 R12: ffff8801b7487c08 [ 28.172822] R13: ffffeafff8f88020 R14: ffffeafff8f88000 R15: 0000000000000001 [ 28.180073] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.188275] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.194216] CR2: ffffeafff8f88020 CR3: 00000001c5f0f000 CR4: 00000000001606f0 [ 28.201543] Stack: [ 28.203675] ffffeafff8f88020 ffff8801b7487c08 ffff8801cb2dc800 ffffeafff8f88000 [ 28.211789] ffff8801b7930c08 ffff8801b74879c8 ffffffff8154cb8f ffff8801b7487c18 [ 28.219860] ffff8801b7487c10 ffff8801b7487c88 00003ffe3e2001e0 00000001cb2dc000 [ 28.227864] Call Trace: [ 28.230432] [] zap_huge_pmd+0x16f/0x860 [ 28.236039] [] unmap_page_range+0x12ad/0x1730 [ 28.242166] [] ? vm_normal_page_pmd+0x310/0x310 [ 28.248463] [] unmap_single_vma+0x101/0x260 [ 28.254410] [] unmap_vmas+0x102/0x1d0 [ 28.259833] [] exit_mmap+0x214/0x3f0 [ 28.265172] [] ? SyS_munmap+0xa0/0xa0 [ 28.270597] [] ? up_write+0x1a/0x60 [ 28.275850] [] mmput+0xf3/0x2d0 [ 28.280756] [] do_exit+0x906/0x27b0 [ 28.286009] [] ? release_task.part.19+0x1210/0x1210 [ 28.292653] [] ? retint_kernel+0x2d/0x2d [ 28.298343] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.305163] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.311721] [] ? check_preemption_disabled+0x3b/0x170 [ 28.318539] [] ? retint_kernel+0x2d/0x2d [ 28.324230] [] do_group_exit+0x111/0x340 [ 28.329920] [] ? do_group_exit+0x340/0x340 [ 28.335783] [] SyS_exit_group+0x1d/0x20 [ 28.341383] [] do_syscall_64+0x1a6/0x490 [ 28.347069] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.354066] 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 [ 28.380868] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.387299] RSP [ 28.390900] CR2: ffffeafff8f88020 [ 28.394331] ---[ end trace f0ce942d2c502ef0 ]--- [ 28.399060] Kernel panic - not syncing: Fatal exception [ 28.404706] Dumping ftrace buffer: [ 28.408228] (ftrace buffer empty) [ 28.411917] Kernel Offset: disabled [ 28.415520] Rebooting in 86400 seconds..