[....] 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[ 13.188090] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.086468] random: sshd: uninitialized urandom read (32 bytes read) [ 15.387659] random: sshd: uninitialized urandom read (32 bytes read) [ 15.925890] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 21.552344] urandom_read: 1 callbacks suppressed [ 21.552347] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.638830] BUG: unable to handle kernel paging request at ffffeafff90a0020 [ 21.646193] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.652441] PGD 0 [ 21.654388] [ 21.656010] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.660490] Dumping ftrace buffer: [ 21.664003] (ftrace buffer empty) [ 21.667689] Modules linked in: [ 21.671008] CPU: 0 PID: 3799 Comm: syz-executor752 Not tainted 4.9.121-g681e57b #25 [ 21.678771] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.688111] task: ffff8801b7350000 task.stack: ffff8801b5dd0000 [ 21.694152] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.702840] RSP: 0018:ffff8801b5dd7948 EFLAGS: 00010246 [ 21.708265] RAX: dffffc0000000000 RBX: ffffeafff90a0000 RCX: 0000000000000000 [ 21.715512] RDX: 1ffffd5fff214004 RSI: ffffffff814f5278 RDI: ffffeafff90a0000 [ 21.722761] RBP: ffff8801b5dd7970 R08: 0000000000033220 R09: 0000000000000001 [ 21.730033] R10: ffff8801b7350000 R11: 0000000000000001 R12: ffff8801b5dd7c08 [ 21.737367] R13: ffffeafff90a0020 R14: ffffeafff90a0000 R15: 0000000000000001 [ 21.744622] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.752828] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.758713] CR2: ffffeafff90a0020 CR3: 00000001b7553000 CR4: 00000000001606f0 [ 21.765962] Stack: [ 21.768087] ffffeafff90a0020 ffff8801b5dd7c08 ffff8801c7a3a800 ffffeafff90a0000 [ 21.776130] ffff8801beae8d68 ffff8801b5dd79c8 ffffffff8154c20f ffff8801b5dd7c18 [ 21.784153] ffff8801b5dd7c10 ffff8801b5dd7c88 00003ffe428001e0 00000001c7a3a000 [ 21.792187] Call Trace: [ 21.794793] [] zap_huge_pmd+0x16f/0x860 [ 21.800397] [] unmap_page_range+0x12ad/0x1730 [ 21.806533] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 21.812828] [] unmap_single_vma+0x101/0x260 [ 21.818784] [] unmap_vmas+0x102/0x1d0 [ 21.824210] [] exit_mmap+0x214/0x3f0 [ 21.829548] [] ? SyS_munmap+0xa0/0xa0 [ 21.834997] [] ? up_write+0x1a/0x60 [ 21.840255] [] mmput+0xf3/0x2d0 [ 21.845163] [] do_exit+0x906/0x27b0 [ 21.850420] [] ? release_task.part.19+0x1210/0x1210 [ 21.857064] [] ? up_write+0x1a/0x60 [ 21.862328] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.868449] [] ? mprotect_fixup+0x930/0x930 [ 21.874399] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 21.881908] [] do_group_exit+0x111/0x340 [ 21.887620] [] ? do_group_exit+0x340/0x340 [ 21.893479] [] SyS_exit_group+0x1d/0x20 [ 21.899080] [] do_syscall_64+0x1a6/0x490 [ 21.904766] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.911693] 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 [ 21.938755] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.945085] RSP [ 21.948684] CR2: ffffeafff90a0020 [ 21.952113] ---[ end trace e15c8d0d5006cab1 ]--- [ 21.956854] Kernel panic - not syncing: Fatal exception [ 21.962550] Dumping ftrace buffer: [ 21.966078] (ftrace buffer empty) [ 21.969761] Kernel Offset: disabled [ 21.973361] Rebooting in 86400 seconds..