[....] 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[ 14.027342] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.148160] random: sshd: uninitialized urandom read (32 bytes read) [ 22.465803] random: sshd: uninitialized urandom read (32 bytes read) [ 22.938417] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 29.045961] urandom_read: 1 callbacks suppressed [ 29.045964] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.130006] BUG: unable to handle kernel paging request at ffffeafff9150020 [ 29.137642] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.143888] PGD 0 [ 29.145834] [ 29.147454] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.151931] Dumping ftrace buffer: [ 29.155445] (ftrace buffer empty) [ 29.159130] Modules linked in: [ 29.162478] CPU: 1 PID: 3796 Comm: syz-executor874 Not tainted 4.9.121-g681e57b #77 [ 29.170250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.179584] task: ffff8801b8d6c800 task.stack: ffff8801b6a98000 [ 29.185625] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.194302] RSP: 0018:ffff8801b6a9f948 EFLAGS: 00010246 [ 29.199724] RAX: dffffc0000000000 RBX: ffffeafff9150000 RCX: 0000000000000000 [ 29.206970] RDX: 1ffffd5fff22a004 RSI: ffffffff814f5278 RDI: ffffeafff9150000 [ 29.214214] RBP: ffff8801b6a9f970 R08: 0000000000033ea0 R09: 0000000000000001 [ 29.221458] R10: ffff8801b8d6c800 R11: 0000000000000001 R12: ffff8801b6a9fc08 [ 29.228701] R13: ffffeafff9150020 R14: ffffeafff9150000 R15: 0000000000000001 [ 29.235957] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.244247] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.250107] CR2: ffffeafff9150020 CR3: 00000001b6bc5000 CR4: 00000000001606f0 [ 29.257353] Stack: [ 29.259481] ffffeafff9150020 ffff8801b6a9fc08 ffff8801b8356800 ffffeafff9150000 [ 29.267472] ffff8801b8808160 ffff8801b6a9f9c8 ffffffff8154c20f ffff8801b6a9fc18 [ 29.275460] ffff8801b6a9fc10 ffff8801b6a9fc88 00003ffe454001e0 00000001b8356000 [ 29.283449] Call Trace: [ 29.286014] [] zap_huge_pmd+0x16f/0x860 [ 29.291615] [] unmap_page_range+0x12ad/0x1730 [ 29.297742] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.304038] [] unmap_single_vma+0x101/0x260 [ 29.309983] [] unmap_vmas+0x102/0x1d0 [ 29.315409] [] exit_mmap+0x214/0x3f0 [ 29.320747] [] ? SyS_munmap+0xa0/0xa0 [ 29.326178] [] ? up_write+0x1a/0x60 [ 29.331524] [] mmput+0xf3/0x2d0 [ 29.336428] [] do_exit+0x906/0x27b0 [ 29.341680] [] ? release_task.part.19+0x1210/0x1210 [ 29.348321] [] ? up_write+0x1a/0x60 [ 29.353575] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.359697] [] ? mprotect_fixup+0x930/0x930 [ 29.365646] [] do_group_exit+0x111/0x340 [ 29.371333] [] ? do_group_exit+0x340/0x340 [ 29.377195] [] SyS_exit_group+0x1d/0x20 [ 29.382798] [] do_syscall_64+0x1a6/0x490 [ 29.388485] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.395386] 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 [ 29.422546] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.428878] RSP [ 29.432477] CR2: ffffeafff9150020 [ 29.435950] ---[ end trace 25f8640dc831e3ed ]--- [ 29.440690] Kernel panic - not syncing: Fatal exception [ 29.446327] Dumping ftrace buffer: [ 29.449845] (ftrace buffer empty) [ 29.453527] Kernel Offset: disabled [ 29.457125] Rebooting in 86400 seconds..