[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.935358] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.603750] random: sshd: uninitialized urandom read (32 bytes read) [ 17.829231] random: sshd: uninitialized urandom read (32 bytes read) [ 18.349604] random: sshd: uninitialized urandom read (32 bytes read) [ 35.404879] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 40.950447] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.044290] BUG: unable to handle kernel paging request at ffffeafff9058020 [ 41.051666] IP: [] page_remove_rmap+0x37/0x6d0 [ 41.057912] PGD 0 [ 41.059903] [ 41.061539] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.066010] Dumping ftrace buffer: [ 41.069571] (ftrace buffer empty) [ 41.073267] Modules linked in: [ 41.076604] CPU: 0 PID: 3805 Comm: syz-executor987 Not tainted 4.9.122-g54068d6 #26 [ 41.084387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.093730] task: ffff8801b81d8000 task.stack: ffff8801d9250000 [ 41.099761] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 41.108444] RSP: 0018:ffff8801d9257948 EFLAGS: 00010246 [ 41.113867] RAX: dffffc0000000000 RBX: ffffeafff9058000 RCX: 0000000000000000 [ 41.121115] RDX: 1ffffd5fff20b004 RSI: ffffffff814f5918 RDI: ffffeafff9058000 [ 41.128361] RBP: ffff8801d9257970 R08: 0000000000033e60 R09: 0000000000000001 [ 41.135761] R10: ffff8801b81d8000 R11: 0000000000000001 R12: ffff8801d9257c08 [ 41.143016] R13: ffffeafff9058020 R14: ffffeafff9058000 R15: 0000000000000001 [ 41.150421] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.158636] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.164497] CR2: ffffeafff9058020 CR3: 00000001c4db8000 CR4: 00000000001606f0 [ 41.171823] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.179080] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.186499] Stack: [ 41.188683] ffffeafff9058020 ffff8801d9257c08 ffff8801b7f59800 ffffeafff9058000 [ 41.196758] ffff8801c8056630 ffff8801d92579c8 ffffffff8154cb8f ffff8801d9257c18 [ 41.204954] ffff8801d9257c10 ffff8801d9257c88 00003ffe416001e0 00000001b7f59000 [ 41.213095] Call Trace: [ 41.215667] [] zap_huge_pmd+0x16f/0x860 [ 41.221275] [] unmap_page_range+0x12ad/0x1730 [ 41.227404] [] ? vm_normal_page_pmd+0x310/0x310 [ 41.233780] [] unmap_single_vma+0x101/0x260 [ 41.239736] [] unmap_vmas+0x102/0x1d0 [ 41.245163] [] exit_mmap+0x214/0x3f0 [ 41.250501] [] ? SyS_munmap+0xa0/0xa0 [ 41.255929] [] ? up_write+0x1a/0x60 [ 41.261379] [] mmput+0xf3/0x2d0 [ 41.266296] [] do_exit+0x906/0x27b0 [ 41.271662] [] ? release_task.part.19+0x1210/0x1210 [ 41.278375] [] ? up_write+0x1a/0x60 [ 41.283641] [] ? do_mprotect_pkey+0x71d/0x890 [ 41.289822] [] ? mprotect_fixup+0x930/0x930 [ 41.295780] [] do_group_exit+0x111/0x340 [ 41.301470] [] ? do_group_exit+0x340/0x340 [ 41.307331] [] SyS_exit_group+0x1d/0x20 [ 41.312938] [] do_syscall_64+0x1a6/0x490 [ 41.318637] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 41.325618] 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 [ 41.352478] RIP [] page_remove_rmap+0x37/0x6d0 [ 41.358816] RSP [ 41.362417] CR2: ffffeafff9058020 [ 41.365845] ---[ end trace b41482070ce633ac ]--- [ 41.370572] Kernel panic - not syncing: Fatal exception [ 41.376367] Dumping ftrace buffer: [ 41.379903] (ftrace buffer empty) [ 41.383593] Kernel Offset: disabled [ 41.387208] Rebooting in 86400 seconds..