[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.489812] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.528524] random: sshd: uninitialized urandom read (32 bytes read) [ 14.893799] random: sshd: uninitialized urandom read (32 bytes read) [ 15.372100] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 31.727391] urandom_read: 1 callbacks suppressed [ 31.727394] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.817802] BUG: unable to handle kernel paging request at ffffeafff8d90020 [ 31.825252] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.831577] PGD 0 [ 31.833532] [ 31.835161] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.839629] Dumping ftrace buffer: [ 31.843304] (ftrace buffer empty) [ 31.846987] Modules linked in: [ 31.850374] CPU: 1 PID: 3656 Comm: syz-executor529 Not tainted 4.9.121-g681e57b #77 [ 31.858188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.867526] task: ffff8801c5594800 task.stack: ffff8801c3f30000 [ 31.873560] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.882242] RSP: 0018:ffff8801c3f37948 EFLAGS: 00010246 [ 31.887665] RAX: dffffc0000000000 RBX: ffffeafff8d90000 RCX: 0000000000000000 [ 31.894952] RDX: 1ffffd5fff1b2004 RSI: ffffffff814f5278 RDI: ffffeafff8d90000 [ 31.902205] RBP: ffff8801c3f37970 R08: 0000000000033d80 R09: 0000000000000001 [ 31.909458] R10: ffff8801c5594800 R11: 0000000000000001 R12: ffff8801c3f37c08 [ 31.916708] R13: ffffeafff8d90020 R14: ffffeafff8d90000 R15: 0000000000000001 [ 31.923958] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.932200] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.938066] CR2: ffffeafff8d90020 CR3: 00000001c6c02000 CR4: 00000000001606f0 [ 31.945316] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.952617] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.959867] Stack: [ 31.961995] ffffeafff8d90020 ffff8801c3f37c08 ffff8801c7acb800 ffffeafff8d90000 [ 31.969981] ffff8801c95b4478 ffff8801c3f379c8 ffffffff8154c20f ffff8801c3f37c18 [ 31.978027] ffff8801c3f37c10 ffff8801c3f37c88 00003ffe364001e0 00000001c7acb000 [ 31.986042] Call Trace: [ 31.988618] [] zap_huge_pmd+0x16f/0x860 [ 31.994226] [] unmap_page_range+0x12ad/0x1730 [ 32.000354] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 32.006652] [] unmap_single_vma+0x101/0x260 [ 32.012709] [] unmap_vmas+0x102/0x1d0 [ 32.018137] [] exit_mmap+0x214/0x3f0 [ 32.023523] [] ? SyS_munmap+0xa0/0xa0 [ 32.029022] [] ? up_write+0x1a/0x60 [ 32.034293] [] mmput+0xf3/0x2d0 [ 32.039250] [] do_exit+0x906/0x27b0 [ 32.044511] [] ? release_task.part.19+0x1210/0x1210 [ 32.051158] [] ? up_write+0x1a/0x60 [ 32.056416] [] ? do_mprotect_pkey+0x71d/0x890 [ 32.062542] [] ? mprotect_fixup+0x930/0x930 [ 32.068496] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 32.076078] [] do_group_exit+0x111/0x340 [ 32.081774] [] ? do_group_exit+0x340/0x340 [ 32.087634] [] SyS_exit_group+0x1d/0x20 [ 32.093311] [] do_syscall_64+0x1a6/0x490 [ 32.099004] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.105902] 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 [ 32.133020] RIP [] page_remove_rmap+0x37/0x6d0 [ 32.139361] RSP [ 32.142962] CR2: ffffeafff8d90020 [ 32.146391] ---[ end trace 08b9457519dcbf9b ]--- [ 32.151207] Kernel panic - not syncing: Fatal exception [ 32.156998] Dumping ftrace buffer: [ 32.160521] (ftrace buffer empty) [ 32.164205] Kernel Offset: disabled [ 32.167806] Rebooting in 86400 seconds..