[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.279110] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.643965] random: sshd: uninitialized urandom read (32 bytes read) [ 15.058905] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.546657] random: sshd: uninitialized urandom read (32 bytes read) [ 15.678854] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 23.052294] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.135494] BUG: unable to handle kernel paging request at ffffeafff9130020 [ 23.142954] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.149393] PGD 0 [ 23.151344] [ 23.152960] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.157430] Dumping ftrace buffer: [ 23.160948] (ftrace buffer empty) [ 23.164692] Modules linked in: [ 23.167977] CPU: 0 PID: 3800 Comm: syz-executor910 Not tainted 4.9.121-g681e57b #25 [ 23.175745] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.185139] task: ffff8801b6d1b000 task.stack: ffff8801bbc70000 [ 23.191173] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.199940] RSP: 0018:ffff8801bbc77948 EFLAGS: 00010246 [ 23.205367] RAX: dffffc0000000000 RBX: ffffeafff9130000 RCX: 0000000000000000 [ 23.212630] RDX: 1ffffd5fff226004 RSI: ffffffff814f5278 RDI: ffffeafff9130000 [ 23.219870] RBP: ffff8801bbc77970 R08: 00000000000346c0 R09: 0000000000000001 [ 23.227349] R10: ffff8801b6d1b000 R11: 0000000000000001 R12: ffff8801bbc77c08 [ 23.234617] R13: ffffeafff9130020 R14: ffffeafff9130000 R15: 0000000000000001 [ 23.241861] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.250058] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.256012] CR2: ffffeafff9130020 CR3: 00000001b6f16000 CR4: 00000000001606f0 [ 23.263256] Stack: [ 23.265391] ffffeafff9130020 ffff8801bbc77c08 ffff8801bf74e800 ffffeafff9130000 [ 23.273376] ffff8801c64cc5d8 ffff8801bbc779c8 ffffffff8154c20f ffff8801bbc77c18 [ 23.281393] ffff8801bbc77c10 ffff8801bbc77c88 00003ffe44c001e0 00000001bf74e000 [ 23.289405] Call Trace: [ 23.291976] [] zap_huge_pmd+0x16f/0x860 [ 23.297704] [] unmap_page_range+0x12ad/0x1730 [ 23.303834] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 23.310266] [] unmap_single_vma+0x101/0x260 [ 23.316281] [] unmap_vmas+0x102/0x1d0 [ 23.321722] [] exit_mmap+0x214/0x3f0 [ 23.327055] [] ? SyS_munmap+0xa0/0xa0 [ 23.332501] [] ? up_write+0x1a/0x60 [ 23.337752] [] mmput+0xf3/0x2d0 [ 23.342650] [] do_exit+0x906/0x27b0 [ 23.347894] [] ? release_task.part.19+0x1210/0x1210 [ 23.354541] [] ? up_write+0x1a/0x60 [ 23.359794] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.365910] [] ? mprotect_fixup+0x930/0x930 [ 23.371850] [] do_group_exit+0x111/0x340 [ 23.377532] [] ? do_group_exit+0x340/0x340 [ 23.383545] [] SyS_exit_group+0x1d/0x20 [ 23.389149] [] do_syscall_64+0x1a6/0x490 [ 23.394835] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.401727] 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 [ 23.428872] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.435308] RSP [ 23.438905] CR2: ffffeafff9130020 [ 23.442389] ---[ end trace afd27f59f478af86 ]--- [ 23.447293] Kernel panic - not syncing: Fatal exception [ 23.452897] Dumping ftrace buffer: [ 23.456460] (ftrace buffer empty) [ 23.460232] Kernel Offset: disabled [ 23.463838] Rebooting in 86400 seconds..