[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.746102] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.615127] random: sshd: uninitialized urandom read (32 bytes read) [ 14.901339] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.486874] random: sshd: uninitialized urandom read (32 bytes read) [ 15.621250] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 21.104405] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.187089] BUG: unable to handle kernel paging request at ffffeafff8ea0020 [ 21.194444] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.200690] PGD 0 [ 21.202653] [ 21.204272] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.208739] Dumping ftrace buffer: [ 21.212249] (ftrace buffer empty) [ 21.215931] Modules linked in: [ 21.219210] CPU: 0 PID: 3793 Comm: syz-executor612 Not tainted 4.9.121-g681e57b #25 [ 21.227125] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.236456] task: ffff8801b6ea4800 task.stack: ffff8801b8a08000 [ 21.242484] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.251169] RSP: 0018:ffff8801b8a0f948 EFLAGS: 00010246 [ 21.256587] RAX: dffffc0000000000 RBX: ffffeafff8ea0000 RCX: 0000000000000000 [ 21.263837] RDX: 1ffffd5fff1d4004 RSI: ffffffff814f5278 RDI: ffffeafff8ea0000 [ 21.271077] RBP: ffff8801b8a0f970 R08: 0000000000033820 R09: 0000000000000001 [ 21.278317] R10: ffff8801b6ea4800 R11: 0000000000000001 R12: ffff8801b8a0fc08 [ 21.285559] R13: ffffeafff8ea0020 R14: ffffeafff8ea0000 R15: 0000000000000001 [ 21.292802] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.300999] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.306853] CR2: ffffeafff8ea0020 CR3: 00000001b9ee8000 CR4: 00000000001606f0 [ 21.314123] Stack: [ 21.316248] ffffeafff8ea0020 ffff8801b8a0fc08 ffff8801b76a4800 ffffeafff8ea0000 [ 21.324241] ffff8801b6d3e9a0 ffff8801b8a0f9c8 ffffffff8154c20f ffff8801b8a0fc18 [ 21.332209] ffff8801b8a0fc10 ffff8801b8a0fc88 00003ffe3a8001e0 00000001b76a4000 [ 21.340190] Call Trace: [ 21.342748] [] zap_huge_pmd+0x16f/0x860 [ 21.348347] [] unmap_page_range+0x12ad/0x1730 [ 21.354467] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 21.360775] [] unmap_single_vma+0x101/0x260 [ 21.366728] [] unmap_vmas+0x102/0x1d0 [ 21.372151] [] exit_mmap+0x214/0x3f0 [ 21.377505] [] ? SyS_munmap+0xa0/0xa0 [ 21.382930] [] ? up_write+0x1a/0x60 [ 21.388182] [] mmput+0xf3/0x2d0 [ 21.393086] [] do_exit+0x906/0x27b0 [ 21.398337] [] ? release_task.part.19+0x1210/0x1210 [ 21.404975] [] ? up_write+0x1a/0x60 [ 21.410222] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.416340] [] ? mprotect_fixup+0x930/0x930 [ 21.422286] [] do_group_exit+0x111/0x340 [ 21.427968] [] ? do_group_exit+0x340/0x340 [ 21.433837] [] SyS_exit_group+0x1d/0x20 [ 21.439435] [] do_syscall_64+0x1a6/0x490 [ 21.445122] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.452047] 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 [ 21.478995] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.485328] RSP [ 21.488923] CR2: ffffeafff8ea0020 [ 21.492366] ---[ end trace 259457b18e394abe ]--- [ 21.497095] Kernel panic - not syncing: Fatal exception [ 21.502816] Dumping ftrace buffer: [ 21.506338] (ftrace buffer empty) [ 21.510022] Kernel Offset: disabled [ 21.513625] Rebooting in 86400 seconds..