[....] 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[ 13.606752] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.274486] random: sshd: uninitialized urandom read (32 bytes read) [ 15.548397] random: sshd: uninitialized urandom read (32 bytes read) [ 16.118718] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.61' (ECDSA) to the list of known hosts. [ 21.735570] urandom_read: 1 callbacks suppressed [ 21.735573] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.818582] BUG: unable to handle kernel paging request at ffffeafff90c8020 [ 21.825918] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.832162] PGD 0 [ 21.834105] [ 21.835723] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.840220] Dumping ftrace buffer: [ 21.843743] (ftrace buffer empty) [ 21.847426] Modules linked in: [ 21.850744] CPU: 1 PID: 3797 Comm: syz-executor360 Not tainted 4.9.122-g54068d6 #78 [ 21.858507] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.867834] task: ffff8801b6fc9800 task.stack: ffff8801b5b98000 [ 21.873860] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.882526] RSP: 0018:ffff8801b5b9f948 EFLAGS: 00010246 [ 21.887944] RAX: dffffc0000000000 RBX: ffffeafff90c8000 RCX: 0000000000000000 [ 21.895186] RDX: 1ffffd5fff219004 RSI: ffffffff814f5918 RDI: ffffeafff90c8000 [ 21.902489] RBP: ffff8801b5b9f970 R08: 0000000000033f40 R09: 0000000000000001 [ 21.909735] R10: ffff8801b6fc9800 R11: 0000000000000001 R12: ffff8801b5b9fc08 [ 21.917012] R13: ffffeafff90c8020 R14: ffffeafff90c8000 R15: 0000000000000001 [ 21.924265] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 21.932461] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.938323] CR2: ffffeafff90c8020 CR3: 00000001cb1db000 CR4: 00000000001606f0 [ 21.945575] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.952829] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.960162] Stack: [ 21.962315] ffffeafff90c8020 ffff8801b5b9fc08 ffff8801c61d2800 ffffeafff90c8000 [ 21.970327] ffff8801cc52a5d8 ffff8801b5b9f9c8 ffffffff8154cb8f ffff8801b5b9fc18 [ 21.978434] ffff8801b5b9fc10 ffff8801b5b9fc88 00003ffe432001e0 00000001c61d2000 [ 21.986424] Call Trace: [ 21.988988] [] zap_huge_pmd+0x16f/0x860 [ 21.994586] [] unmap_page_range+0x12ad/0x1730 [ 22.000705] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.006995] [] unmap_single_vma+0x101/0x260 [ 22.012937] [] unmap_vmas+0x102/0x1d0 [ 22.018361] [] exit_mmap+0x214/0x3f0 [ 22.023727] [] ? SyS_munmap+0xa0/0xa0 [ 22.029151] [] ? up_write+0x1a/0x60 [ 22.034399] [] mmput+0xf3/0x2d0 [ 22.039315] [] do_exit+0x906/0x27b0 [ 22.044568] [] ? release_task.part.19+0x1210/0x1210 [ 22.051205] [] ? up_write+0x1a/0x60 [ 22.056454] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.062571] [] ? mprotect_fixup+0x930/0x930 [ 22.068515] [] do_group_exit+0x111/0x340 [ 22.074198] [] ? do_group_exit+0x340/0x340 [ 22.080054] [] SyS_exit_group+0x1d/0x20 [ 22.085664] [] do_syscall_64+0x1a6/0x490 [ 22.091347] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.098243] 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 [ 22.125253] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.131576] RSP [ 22.135170] CR2: ffffeafff90c8020 [ 22.138600] ---[ end trace 563fd6ba06c0dbeb ]--- [ 22.143334] Kernel panic - not syncing: Fatal exception [ 22.149030] Dumping ftrace buffer: [ 22.152546] (ftrace buffer empty) [ 22.156230] Kernel Offset: disabled [ 22.159826] Rebooting in 86400 seconds..