[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.598321] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.492552] random: sshd: uninitialized urandom read (32 bytes read) [ 22.721685] random: sshd: uninitialized urandom read (32 bytes read) [ 23.160932] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 28.789190] urandom_read: 1 callbacks suppressed [ 28.789194] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.887753] BUG: unable to handle kernel paging request at ffffeafff8f08020 [ 28.895620] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.901901] PGD 0 [ 28.903861] [ 28.905497] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.910143] Dumping ftrace buffer: [ 28.913673] (ftrace buffer empty) [ 28.917487] Modules linked in: [ 28.926861] CPU: 1 PID: 3733 Comm: syz-executor133 Not tainted 4.9.122-g54068d6 #78 [ 28.934651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.944169] task: ffff8801c060c800 task.stack: ffff8801bdc68000 [ 28.950214] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.958932] RSP: 0018:ffff8801bdc6f948 EFLAGS: 00010246 [ 28.964368] RAX: dffffc0000000000 RBX: ffffeafff8f08000 RCX: 0000000000000000 [ 28.971628] RDX: 1ffffd5fff1e1004 RSI: ffffffff814f5918 RDI: ffffeafff8f08000 [ 28.979148] RBP: ffff8801bdc6f970 R08: 0000000000034280 R09: 0000000000000001 [ 28.986703] R10: ffff8801c060c800 R11: 0000000000000001 R12: ffff8801bdc6fc08 [ 28.994095] R13: ffffeafff8f08020 R14: ffffeafff8f08000 R15: 0000000000000001 [ 29.001363] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.009652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.015730] CR2: ffffeafff8f08020 CR3: 00000001bedff000 CR4: 00000000001606f0 [ 29.022988] Stack: [ 29.025205] ffffeafff8f08020 ffff8801bdc6fc08 ffff8801c1d76800 ffffeafff8f08000 [ 29.033370] ffff8801c7bb8c60 ffff8801bdc6f9c8 ffffffff8154cb8f ffff8801bdc6fc18 [ 29.041569] ffff8801bdc6fc10 ffff8801bdc6fc88 00003ffe3c2001e0 00000001c1d76000 [ 29.049750] Call Trace: [ 29.052331] [] zap_huge_pmd+0x16f/0x860 [ 29.057947] [] unmap_page_range+0x12ad/0x1730 [ 29.064082] [] ? vm_normal_page_pmd+0x310/0x310 [ 29.070390] [] unmap_single_vma+0x101/0x260 [ 29.076353] [] unmap_vmas+0x102/0x1d0 [ 29.081795] [] exit_mmap+0x214/0x3f0 [ 29.087444] [] ? SyS_munmap+0xa0/0xa0 [ 29.092893] [] ? up_write+0x1a/0x60 [ 29.098245] [] mmput+0xf3/0x2d0 [ 29.103434] [] do_exit+0x906/0x27b0 [ 29.108707] [] ? release_task.part.19+0x1210/0x1210 [ 29.115363] [] ? up_write+0x1a/0x60 [ 29.120905] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.127043] [] ? mprotect_fixup+0x930/0x930 [ 29.133322] [] do_group_exit+0x111/0x340 [ 29.139024] [] ? do_group_exit+0x340/0x340 [ 29.145022] [] SyS_exit_group+0x1d/0x20 [ 29.150637] [] do_syscall_64+0x1a6/0x490 [ 29.156484] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.163550] 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 [ 29.191911] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.198275] RSP [ 29.201894] CR2: ffffeafff8f08020 [ 29.205341] ---[ end trace 1151c63d6be58f0f ]--- [ 29.210083] Kernel panic - not syncing: Fatal exception [ 29.215938] Dumping ftrace buffer: [ 29.219477] (ftrace buffer empty) [ 29.223292] Kernel Offset: disabled [ 29.226998] Rebooting in 86400 seconds..