[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.450474] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.717709] random: sshd: uninitialized urandom read (32 bytes read) [ 27.141323] random: sshd: uninitialized urandom read (32 bytes read) [ 27.637017] random: sshd: uninitialized urandom read (32 bytes read) [ 27.773692] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 33.292707] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.377749] BUG: unable to handle kernel paging request at ffffeafff9050020 [ 33.385159] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.391409] PGD 0 [ 33.393356] [ 33.394978] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.399447] Dumping ftrace buffer: [ 33.402964] (ftrace buffer empty) [ 33.406650] Modules linked in: [ 33.409940] CPU: 1 PID: 3775 Comm: syz-executor945 Not tainted 4.9.122-g54068d6 #26 [ 33.417709] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.427040] task: ffff8801bc2bb000 task.stack: ffff8801bab70000 [ 33.433069] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.441819] RSP: 0018:ffff8801bab77948 EFLAGS: 00010246 [ 33.447243] RAX: dffffc0000000000 RBX: ffffeafff9050000 RCX: 0000000000000000 [ 33.454494] RDX: 1ffffd5fff20a004 RSI: ffffffff814f5918 RDI: ffffeafff9050000 [ 33.461877] RBP: ffff8801bab77970 R08: 00000000000339e0 R09: 0000000000000001 [ 33.469125] R10: ffff8801bc2bb000 R11: 0000000000000001 R12: ffff8801bab77c08 [ 33.476480] R13: ffffeafff9050020 R14: ffffeafff9050000 R15: 0000000000000001 [ 33.483731] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.491932] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.497889] CR2: ffffeafff9050020 CR3: 00000001cb604000 CR4: 00000000001606f0 [ 33.505139] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.512409] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.519656] Stack: [ 33.522219] ffffeafff9050020 ffff8801bab77c08 ffff8801c75cd800 ffffeafff9050000 [ 33.530220] ffff8801bbf8b528 ffff8801bab779c8 ffffffff8154cb8f ffff8801bab77c18 [ 33.538285] ffff8801bab77c10 ffff8801bab77c88 00003ffe414001e0 00000001c75cd000 [ 33.546375] Call Trace: [ 33.548945] [] zap_huge_pmd+0x16f/0x860 [ 33.554551] [] unmap_page_range+0x12ad/0x1730 [ 33.560672] [] ? vm_normal_page_pmd+0x310/0x310 [ 33.566969] [] unmap_single_vma+0x101/0x260 [ 33.573044] [] unmap_vmas+0x102/0x1d0 [ 33.578475] [] exit_mmap+0x214/0x3f0 [ 33.583817] [] ? SyS_munmap+0xa0/0xa0 [ 33.589350] [] ? up_write+0x1a/0x60 [ 33.594604] [] mmput+0xf3/0x2d0 [ 33.599553] [] do_exit+0x906/0x27b0 [ 33.604816] [] ? release_task.part.19+0x1210/0x1210 [ 33.611503] [] ? up_write+0x1a/0x60 [ 33.616770] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.622896] [] ? mprotect_fixup+0x930/0x930 [ 33.628856] [] do_group_exit+0x111/0x340 [ 33.634551] [] ? do_group_exit+0x340/0x340 [ 33.640414] [] SyS_exit_group+0x1d/0x20 [ 33.646015] [] do_syscall_64+0x1a6/0x490 [ 33.651821] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.658720] 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 [ 33.685694] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.692077] RSP [ 33.695681] CR2: ffffeafff9050020 [ 33.699111] ---[ end trace 89d0b8e384a57658 ]--- [ 33.703843] Kernel panic - not syncing: Fatal exception [ 33.709570] Dumping ftrace buffer: [ 33.713096] (ftrace buffer empty) [ 33.716783] Kernel Offset: disabled [ 33.720392] Rebooting in 86400 seconds..