[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.600172] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.442787] random: sshd: uninitialized urandom read (32 bytes read) [ 15.646198] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.162971] random: sshd: uninitialized urandom read (32 bytes read) [ 16.307436] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 21.928710] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.016202] BUG: unable to handle kernel paging request at ffffeafff91c8020 [ 22.023595] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.029852] PGD 0 [ 22.031810] [ 22.033431] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.037911] Dumping ftrace buffer: [ 22.041439] (ftrace buffer empty) [ 22.045140] Modules linked in: [ 22.048435] CPU: 1 PID: 3796 Comm: syz-executor407 Not tainted 4.9.121-g681e57b #25 [ 22.056201] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.065548] task: ffff8801b7f6e000 task.stack: ffff8801bbd88000 [ 22.071576] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.080254] RSP: 0018:ffff8801bbd8f948 EFLAGS: 00010246 [ 22.085709] RAX: dffffc0000000000 RBX: ffffeafff91c8000 RCX: 0000000000000000 [ 22.092955] RDX: 1ffffd5fff239004 RSI: ffffffff814f5278 RDI: ffffeafff91c8000 [ 22.100196] RBP: ffff8801bbd8f970 R08: 0000000000033360 R09: 0000000000000001 [ 22.107458] R10: ffff8801b7f6e000 R11: 0000000000000001 R12: ffff8801bbd8fc08 [ 22.114714] R13: ffffeafff91c8020 R14: ffffeafff91c8000 R15: 0000000000000001 [ 22.121961] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.130161] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.136014] CR2: ffffeafff91c8020 CR3: 00000001bf70e000 CR4: 00000000001606f0 [ 22.143259] Stack: [ 22.145405] ffffeafff91c8020 ffff8801bbd8fc08 ffff8801c30cc800 ffffeafff91c8000 [ 22.153410] ffff8801b651b6e0 ffff8801bbd8f9c8 ffffffff8154c20f ffff8801bbd8fc18 [ 22.161424] ffff8801bbd8fc10 ffff8801bbd8fc88 00003ffe472001e0 00000001c30cc000 [ 22.169421] Call Trace: [ 22.172031] [] zap_huge_pmd+0x16f/0x860 [ 22.177651] [] unmap_page_range+0x12ad/0x1730 [ 22.183772] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.190078] [] unmap_single_vma+0x101/0x260 [ 22.196022] [] unmap_vmas+0x102/0x1d0 [ 22.201449] [] exit_mmap+0x214/0x3f0 [ 22.206786] [] ? SyS_munmap+0xa0/0xa0 [ 22.212219] [] ? up_write+0x1a/0x60 [ 22.217476] [] mmput+0xf3/0x2d0 [ 22.222405] [] do_exit+0x906/0x27b0 [ 22.227670] [] ? release_task.part.19+0x1210/0x1210 [ 22.234309] [] ? up_write+0x1a/0x60 [ 22.239585] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.245706] [] ? mprotect_fixup+0x930/0x930 [ 22.251651] [] do_group_exit+0x111/0x340 [ 22.257336] [] ? do_group_exit+0x340/0x340 [ 22.263202] [] SyS_exit_group+0x1d/0x20 [ 22.268807] [] do_syscall_64+0x1a6/0x490 [ 22.274526] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.281422] 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 [ 22.308368] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.314698] RSP [ 22.318309] CR2: ffffeafff91c8020 [ 22.321741] ---[ end trace 2188703263c79c02 ]--- [ 22.326468] Kernel panic - not syncing: Fatal exception [ 22.332108] Dumping ftrace buffer: [ 22.335633] (ftrace buffer empty) [ 22.339320] Kernel Offset: disabled [ 22.342927] Rebooting in 86400 seconds..