[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.680005] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.001067] random: sshd: uninitialized urandom read (32 bytes read) [ 17.173309] random: sshd: uninitialized urandom read (32 bytes read) [ 17.661262] random: sshd: uninitialized urandom read (32 bytes read) [ 31.150124] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 36.765194] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.856452] BUG: unable to handle kernel paging request at ffffeafff90e0020 [ 36.863986] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.870255] PGD 0 [ 36.872327] [ 36.873991] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.878474] Dumping ftrace buffer: [ 36.882000] (ftrace buffer empty) [ 36.885787] Modules linked in: [ 36.889102] CPU: 0 PID: 3796 Comm: syz-executor996 Not tainted 4.9.120-gf85543b #76 [ 36.897057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.906399] task: ffff8801b8aa6000 task.stack: ffff8801d9700000 [ 36.912451] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.921150] RSP: 0018:ffff8801d9707948 EFLAGS: 00010246 [ 36.926584] RAX: dffffc0000000000 RBX: ffffeafff90e0000 RCX: 0000000000000000 [ 36.933839] RDX: 1ffffd5fff21c004 RSI: ffffffff814f5128 RDI: ffffeafff90e0000 [ 36.941229] RBP: ffff8801d9707970 R08: 0000000000034a20 R09: 0000000000000001 [ 36.948631] R10: ffff8801b8aa6000 R11: 0000000000000001 R12: ffff8801d9707c08 [ 36.955888] R13: ffffeafff90e0020 R14: ffffeafff90e0000 R15: 0000000000000001 [ 36.963145] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.971357] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.977226] CR2: ffffeafff90e0020 CR3: 00000001c2003000 CR4: 00000000001606f0 [ 36.984484] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.991742] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.998997] Stack: [ 37.001134] ffffeafff90e0020 ffff8801d9707c08 ffff8801c200f800 ffffeafff90e0000 [ 37.009183] ffff8801babc8948 ffff8801d97079c8 ffffffff8154bfcf ffff8801d9707c18 [ 37.017360] ffff8801d9707c10 ffff8801d9707c88 00003ffe438001e0 00000001c200f000 [ 37.025411] Call Trace: [ 37.028011] [] zap_huge_pmd+0x16f/0x860 [ 37.033627] [] unmap_page_range+0x12ad/0x1730 [ 37.039760] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 37.046155] [] unmap_single_vma+0x101/0x260 [ 37.052120] [] unmap_vmas+0x102/0x1d0 [ 37.057557] [] exit_mmap+0x214/0x3f0 [ 37.062906] [] ? SyS_munmap+0xa0/0xa0 [ 37.068343] [] ? up_write+0x1a/0x60 [ 37.073607] [] mmput+0xf3/0x2d0 [ 37.078525] [] do_exit+0x906/0x27b0 [ 37.083788] [] ? release_task.part.19+0x1210/0x1210 [ 37.090445] [] ? up_write+0x1a/0x60 [ 37.095707] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.101836] [] ? mprotect_fixup+0x930/0x930 [ 37.107792] [] do_group_exit+0x111/0x340 [ 37.113488] [] ? do_group_exit+0x340/0x340 [ 37.119357] [] SyS_exit_group+0x1d/0x20 [ 37.124992] [] do_syscall_64+0x1a6/0x490 [ 37.130691] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.137597] 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 [ 37.165505] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.172142] RSP [ 37.175939] CR2: ffffeafff90e0020 [ 37.179419] ---[ end trace cd15b7ae61a87d61 ]--- [ 37.184161] Kernel panic - not syncing: Fatal exception [ 37.189896] Dumping ftrace buffer: [ 37.193422] (ftrace buffer empty) [ 37.197122] Kernel Offset: disabled [ 37.200734] Rebooting in 86400 seconds..