[....] 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[ 12.070830] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.056600] random: sshd: uninitialized urandom read (32 bytes read) [ 16.365130] random: sshd: uninitialized urandom read (32 bytes read) [ 16.870636] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 22.470398] urandom_read: 1 callbacks suppressed [ 22.470401] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.556236] BUG: unable to handle kernel paging request at ffffeafff8ff8020 [ 22.563887] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.570133] PGD 0 [ 22.572194] [ 22.573820] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.578287] Dumping ftrace buffer: [ 22.581799] (ftrace buffer empty) [ 22.585482] Modules linked in: [ 22.588770] CPU: 1 PID: 3799 Comm: syz-executor384 Not tainted 4.9.122-g54068d6 #78 [ 22.596532] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.605926] task: ffff8801b84ac800 task.stack: ffff8801d9550000 [ 22.611961] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.620638] RSP: 0018:ffff8801d9557948 EFLAGS: 00010246 [ 22.626065] RAX: dffffc0000000000 RBX: ffffeafff8ff8000 RCX: 0000000000000000 [ 22.633482] RDX: 1ffffd5fff1ff004 RSI: ffffffff814f5918 RDI: ffffeafff8ff8000 [ 22.640733] RBP: ffff8801d9557970 R08: 0000000000033f40 R09: 0000000000000001 [ 22.648150] R10: ffff8801b84ac800 R11: 0000000000000001 R12: ffff8801d9557c08 [ 22.655549] R13: ffffeafff8ff8020 R14: ffffeafff8ff8000 R15: 0000000000000001 [ 22.662803] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.671006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.676866] CR2: ffffeafff8ff8020 CR3: 00000001d959b000 CR4: 00000000001606f0 [ 22.684477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.691725] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.698969] Stack: [ 22.701093] ffffeafff8ff8020 ffff8801d9557c08 ffff8801d9840800 ffffeafff8ff8000 [ 22.709086] ffff8801c38162c0 ffff8801d95579c8 ffffffff8154cb8f ffff8801d9557c18 [ 22.717078] ffff8801d9557c10 ffff8801d9557c88 00003ffe3fe001e0 00000001d9840000 [ 22.725061] Call Trace: [ 22.727630] [] zap_huge_pmd+0x16f/0x860 [ 22.733238] [] unmap_page_range+0x12ad/0x1730 [ 22.739358] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.745658] [] unmap_single_vma+0x101/0x260 [ 22.751603] [] unmap_vmas+0x102/0x1d0 [ 22.757025] [] exit_mmap+0x214/0x3f0 [ 22.762360] [] ? SyS_munmap+0xa0/0xa0 [ 22.767786] [] ? up_write+0x1a/0x60 [ 22.773038] [] mmput+0xf3/0x2d0 [ 22.777946] [] do_exit+0x906/0x27b0 [ 22.783198] [] ? release_task.part.19+0x1210/0x1210 [ 22.789900] [] ? up_write+0x1a/0x60 [ 22.795158] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.801276] [] ? mprotect_fixup+0x930/0x930 [ 22.807228] [] do_group_exit+0x111/0x340 [ 22.812912] [] ? do_group_exit+0x340/0x340 [ 22.818772] [] SyS_exit_group+0x1d/0x20 [ 22.824368] [] do_syscall_64+0x1a6/0x490 [ 22.830054] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.836948] 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 [ 22.863683] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.870015] RSP [ 22.873611] CR2: ffffeafff8ff8020 [ 22.877037] ---[ end trace f43e68053fc1907e ]--- [ 22.881764] Kernel panic - not syncing: Fatal exception [ 22.887472] Dumping ftrace buffer: [ 22.890988] (ftrace buffer empty) [ 22.894668] Kernel Offset: disabled [ 22.898271] Rebooting in 86400 seconds..