[....] 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[ 12.977342] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.897358] random: sshd: uninitialized urandom read (32 bytes read) [ 15.051596] random: sshd: uninitialized urandom read (32 bytes read) [ 15.563499] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 21.296384] urandom_read: 1 callbacks suppressed [ 21.296387] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.380172] BUG: unable to handle kernel paging request at ffffeafff90c8020 [ 21.387534] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.393789] PGD 0 [ 21.395744] [ 21.397364] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.401833] Dumping ftrace buffer: [ 21.405350] (ftrace buffer empty) [ 21.409046] Modules linked in: [ 21.412343] CPU: 0 PID: 3780 Comm: syz-executor912 Not tainted 4.9.122-g54068d6 #78 [ 21.420110] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.429441] task: ffff8801bb113000 task.stack: ffff8801b8fa8000 [ 21.435467] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.444156] RSP: 0018:ffff8801b8faf948 EFLAGS: 00010246 [ 21.449578] RAX: dffffc0000000000 RBX: ffffeafff90c8000 RCX: ffffea0006fe0000 [ 21.456821] RDX: 1ffffd5fff219004 RSI: ffffffff814f5918 RDI: ffffeafff90c8000 [ 21.464066] RBP: ffff8801b8faf970 R08: 0000000000033cc0 R09: 0000000000000001 [ 21.471315] R10: ffff8801bb113000 R11: 0000000000000001 R12: ffff8801b8fafc08 [ 21.478560] R13: ffffeafff90c8020 R14: ffffeafff90c8000 R15: 0000000000000001 [ 21.485807] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.494009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.499874] CR2: ffffeafff90c8020 CR3: 00000001c20c0000 CR4: 00000000001606f0 [ 21.507134] Stack: [ 21.509258] ffffeafff90c8020 ffff8801b8fafc08 ffff8801ba767800 ffffeafff90c8000 [ 21.517237] ffff8801c9afa9a0 ffff8801b8faf9c8 ffffffff8154cb8f ffff8801b8fafc18 [ 21.525252] ffff8801b8fafc10 ffff8801b8fafc88 00003ffe432001e0 00000001ba767000 [ 21.533264] Call Trace: [ 21.535830] [] zap_huge_pmd+0x16f/0x860 [ 21.541435] [] unmap_page_range+0x12ad/0x1730 [ 21.547556] [] ? vm_normal_page_pmd+0x310/0x310 [ 21.553872] [] unmap_single_vma+0x101/0x260 [ 21.559836] [] unmap_vmas+0x102/0x1d0 [ 21.565261] [] exit_mmap+0x214/0x3f0 [ 21.570600] [] ? SyS_munmap+0xa0/0xa0 [ 21.576032] [] ? up_write+0x1a/0x60 [ 21.581290] [] mmput+0xf3/0x2d0 [ 21.586193] [] do_exit+0x906/0x27b0 [ 21.591446] [] ? release_task.part.19+0x1210/0x1210 [ 21.598095] [] ? up_write+0x1a/0x60 [ 21.603354] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.609490] [] ? mprotect_fixup+0x930/0x930 [ 21.615439] [] do_group_exit+0x111/0x340 [ 21.621140] [] ? do_group_exit+0x340/0x340 [ 21.627032] [] SyS_exit_group+0x1d/0x20 [ 21.632656] [] do_syscall_64+0x1a6/0x490 [ 21.638348] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.645247] 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 [ 21.672334] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.678690] RSP [ 21.682286] CR2: ffffeafff90c8020 [ 21.685745] ---[ end trace 788903641f0c7139 ]--- [ 21.690504] Kernel panic - not syncing: Fatal exception [ 21.696271] Dumping ftrace buffer: [ 21.699801] (ftrace buffer empty) [ 21.703485] Kernel Offset: disabled [ 21.707102] Rebooting in 86400 seconds..