[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.480975] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.185706] random: sshd: uninitialized urandom read (32 bytes read) [ 14.514646] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.018954] random: sshd: uninitialized urandom read (32 bytes read) [ 15.157629] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 20.772326] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.847136] BUG: unable to handle kernel paging request at ffffeafff91b0020 [ 20.854480] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.860721] PGD 0 [ 20.862668] [ 20.864289] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.868765] Dumping ftrace buffer: [ 20.872275] (ftrace buffer empty) [ 20.875956] Modules linked in: [ 20.879240] CPU: 1 PID: 3797 Comm: syz-executor886 Not tainted 4.9.121-g681e57b #25 [ 20.887019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.896351] task: ffff8801b6aa3000 task.stack: ffff8801b6f80000 [ 20.902393] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.911066] RSP: 0018:ffff8801b6f87948 EFLAGS: 00010246 [ 20.916485] RAX: dffffc0000000000 RBX: ffffeafff91b0000 RCX: 0000000000000000 [ 20.923728] RDX: 1ffffd5fff236004 RSI: ffffffff814f5278 RDI: ffffeafff91b0000 [ 20.930971] RBP: ffff8801b6f87970 R08: 0000000000034200 R09: 0000000000000001 [ 20.938214] R10: ffff8801b6aa3000 R11: 0000000000000001 R12: ffff8801b6f87c08 [ 20.945459] R13: ffffeafff91b0020 R14: ffffeafff91b0000 R15: 0000000000000001 [ 20.952703] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 20.960903] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.966754] CR2: ffffeafff91b0020 CR3: 00000001c5c0f000 CR4: 00000000001606f0 [ 20.973999] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.981243] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.988486] Stack: [ 20.990609] ffffeafff91b0020 ffff8801b6f87c08 ffff8801c5dbb800 ffffeafff91b0000 [ 20.998599] ffff8801b6dfc790 ffff8801b6f879c8 ffffffff8154c20f ffff8801b6f87c18 [ 21.006590] ffff8801b6f87c10 ffff8801b6f87c88 00003ffe46c001e0 00000001c5dbb000 [ 21.014600] Call Trace: [ 21.017181] [] zap_huge_pmd+0x16f/0x860 [ 21.022782] [] unmap_page_range+0x12ad/0x1730 [ 21.028900] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 21.035192] [] unmap_single_vma+0x101/0x260 [ 21.041136] [] unmap_vmas+0x102/0x1d0 [ 21.046559] [] exit_mmap+0x214/0x3f0 [ 21.051897] [] ? SyS_munmap+0xa0/0xa0 [ 21.057327] [] ? up_write+0x1a/0x60 [ 21.062581] [] mmput+0xf3/0x2d0 [ 21.067486] [] do_exit+0x906/0x27b0 [ 21.072734] [] ? release_task.part.19+0x1210/0x1210 [ 21.079373] [] ? up_write+0x1a/0x60 [ 21.084623] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.090741] [] ? mprotect_fixup+0x930/0x930 [ 21.096686] [] do_group_exit+0x111/0x340 [ 21.102369] [] ? do_group_exit+0x340/0x340 [ 21.108229] [] SyS_exit_group+0x1d/0x20 [ 21.113829] [] do_syscall_64+0x1a6/0x490 [ 21.119517] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.126410] 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 [ 21.153276] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.159627] RSP [ 21.163226] CR2: ffffeafff91b0020 [ 21.166651] ---[ end trace 7edbed1445cf58f3 ]--- [ 21.171375] Kernel panic - not syncing: Fatal exception [ 21.177068] Dumping ftrace buffer: [ 21.180582] (ftrace buffer empty) [ 21.184266] Kernel Offset: disabled [ 21.187868] Rebooting in 86400 seconds..