[....] 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[ 14.870379] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.943452] random: sshd: uninitialized urandom read (32 bytes read) [ 18.299188] random: sshd: uninitialized urandom read (32 bytes read) [ 18.811938] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 24.606245] urandom_read: 1 callbacks suppressed [ 24.606247] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.693253] BUG: unable to handle kernel paging request at ffffeafff91a0020 [ 24.700719] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.707029] PGD 0 [ 24.708981] [ 24.710613] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.715078] Dumping ftrace buffer: [ 24.718599] (ftrace buffer empty) [ 24.722278] Modules linked in: [ 24.725568] CPU: 0 PID: 3798 Comm: syz-executor086 Not tainted 4.9.121-g681e57b #25 [ 24.733327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.742653] task: ffff8801b7161800 task.stack: ffff8801b5ff8000 [ 24.748678] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.757492] RSP: 0018:ffff8801b5fff948 EFLAGS: 00010246 [ 24.762907] RAX: dffffc0000000000 RBX: ffffeafff91a0000 RCX: 0000000000000000 [ 24.770157] RDX: 1ffffd5fff234004 RSI: ffffffff814f5278 RDI: ffffeafff91a0000 [ 24.777512] RBP: ffff8801b5fff970 R08: 0000000000033680 R09: 0000000000000001 [ 24.784782] R10: ffff8801b7161800 R11: 0000000000000001 R12: ffff8801b5fffc08 [ 24.792039] R13: ffffeafff91a0020 R14: ffffeafff91a0000 R15: 0000000000000001 [ 24.799323] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.807532] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.813384] CR2: ffffeafff91a0020 CR3: 00000001c121a000 CR4: 00000000001606f0 [ 24.820755] Stack: [ 24.822882] ffffeafff91a0020 ffff8801b5fffc08 ffff8801c38e3800 ffffeafff91a0000 [ 24.830896] ffff8801c39ec580 ffff8801b5fff9c8 ffffffff8154c20f ffff8801b5fffc18 [ 24.838968] ffff8801b5fffc10 ffff8801b5fffc88 00003ffe468001e0 00000001c38e3000 [ 24.847095] Call Trace: [ 24.849681] [] zap_huge_pmd+0x16f/0x860 [ 24.855291] [] unmap_page_range+0x12ad/0x1730 [ 24.861548] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.867998] [] unmap_single_vma+0x101/0x260 [ 24.873946] [] unmap_vmas+0x102/0x1d0 [ 24.879374] [] exit_mmap+0x214/0x3f0 [ 24.884711] [] ? SyS_munmap+0xa0/0xa0 [ 24.890144] [] ? up_write+0x1a/0x60 [ 24.895399] [] mmput+0xf3/0x2d0 [ 24.900299] [] do_exit+0x906/0x27b0 [ 24.905551] [] ? release_task.part.19+0x1210/0x1210 [ 24.912311] [] ? up_write+0x1a/0x60 [ 24.917661] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.923912] [] ? mprotect_fixup+0x930/0x930 [ 24.929980] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 24.937489] [] do_group_exit+0x111/0x340 [ 24.943274] [] ? do_group_exit+0x340/0x340 [ 24.949329] [] SyS_exit_group+0x1d/0x20 [ 24.955069] [] do_syscall_64+0x1a6/0x490 [ 24.960853] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.967767] 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 [ 24.967825] RIP [ 24.967830] [] page_remove_rmap+0x37/0x6d0 RSP [ 24.967833] CR2: ffffeafff91a0020 [ 24.967840] ---[ end trace ece7c0f86da25fe5 ]--- [ 24.967843] Kernel panic - not syncing: Fatal exception [ 24.983726] Dumping ftrace buffer: [ 24.983729] (ftrace buffer empty) [ 24.983731] Kernel Offset: disabled [ 25.021880] Rebooting in 86400 seconds..