[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.010523] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.946899] random: sshd: uninitialized urandom read (32 bytes read) [ 20.157195] random: sshd: uninitialized urandom read (32 bytes read) [ 20.657207] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. [ 26.275072] urandom_read: 1 callbacks suppressed [ 26.275075] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.357300] BUG: unable to handle kernel paging request at ffffeafff9058020 [ 26.364747] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.371248] PGD 0 [ 26.373201] [ 26.374822] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.379335] Dumping ftrace buffer: [ 26.382853] (ftrace buffer empty) [ 26.386591] Modules linked in: [ 26.389886] CPU: 0 PID: 3774 Comm: syz-executor358 Not tainted 4.9.122-g54068d6 #78 [ 26.397651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.406984] task: ffff8801bc6ee000 task.stack: ffff8801baab0000 [ 26.413008] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.421689] RSP: 0018:ffff8801baab7948 EFLAGS: 00010246 [ 26.427112] RAX: dffffc0000000000 RBX: ffffeafff9058000 RCX: 0000000000000000 [ 26.434352] RDX: 1ffffd5fff20b004 RSI: ffffffff814f5918 RDI: ffffeafff9058000 [ 26.441598] RBP: ffff8801baab7970 R08: 00000000000341a0 R09: 0000000000000001 [ 26.448845] R10: ffff8801bc6ee000 R11: 0000000000000001 R12: ffff8801baab7c08 [ 26.456094] R13: ffffeafff9058020 R14: ffffeafff9058000 R15: 0000000000000001 [ 26.463335] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.471530] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.477383] CR2: ffffeafff9058020 CR3: 00000001cb6e1000 CR4: 00000000001606f0 [ 26.484624] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.491865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.499106] Stack: [ 26.501224] ffffeafff9058020 ffff8801baab7c08 ffff8801cb422800 ffffeafff9058000 [ 26.509209] ffff8801bceca5d8 ffff8801baab79c8 ffffffff8154cb8f ffff8801baab7c18 [ 26.517189] ffff8801baab7c10 ffff8801baab7c88 00003ffe416001e0 00000001cb422000 [ 26.525170] Call Trace: [ 26.527747] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 26.533343] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 26.539459] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 26.545750] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 26.551695] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 26.557120] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 26.562453] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 26.567877] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.573130] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 26.578081] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 26.583355] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 26.589997] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.595248] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 26.601539] [<ffffffff812ad410>] ? do_schedule_next_timer+0x500/0x500 [ 26.608182] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 26.614125] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 26.619810] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 26.625737] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 26.631341] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 26.637025] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.643919] 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 [ 26.670945] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.677272] RSP <ffff8801baab7948> [ 26.680867] CR2: ffffeafff9058020 [ 26.684296] ---[ end trace b4a7ec166dd9ef94 ]--- [ 26.689019] Kernel panic - not syncing: Fatal exception [ 26.694645] Dumping ftrace buffer: [ 26.698159] (ftrace buffer empty) [ 26.701839] Kernel Offset: disabled [ 26.705436] Rebooting in 86400 seconds..