[....] 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[ 12.341390] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.723341] random: sshd: uninitialized urandom read (32 bytes read) [ 20.979901] random: sshd: uninitialized urandom read (32 bytes read) [ 21.491796] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 27.135327] urandom_read: 1 callbacks suppressed [ 27.135331] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.217284] BUG: unable to handle kernel paging request at ffffeafff9080020 [ 27.224671] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.231071] PGD 0 [ 27.233065] [ 27.234695] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.239225] Dumping ftrace buffer: [ 27.242746] (ftrace buffer empty) [ 27.246432] Modules linked in: [ 27.249719] CPU: 0 PID: 3787 Comm: syz-executor577 Not tainted 4.9.122-g54068d6 #78 [ 27.257487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.266823] task: ffff8801bb6ec800 task.stack: ffff8801d9500000 [ 27.272858] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.281535] RSP: 0018:ffff8801d9507948 EFLAGS: 00010246 [ 27.286961] RAX: dffffc0000000000 RBX: ffffeafff9080000 RCX: 0000000000000000 [ 27.294210] RDX: 1ffffd5fff210004 RSI: ffffffff814f5918 RDI: ffffeafff9080000 [ 27.301494] RBP: ffff8801d9507970 R08: 0000000000034440 R09: 0000000000000001 [ 27.308740] R10: ffff8801bb6ec800 R11: 0000000000000001 R12: ffff8801d9507c08 [ 27.315987] R13: ffffeafff9080020 R14: ffffeafff9080000 R15: 0000000000000001 [ 27.323236] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.331439] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.337299] CR2: ffffeafff9080020 CR3: 00000001bc10e000 CR4: 00000000001606f0 [ 27.344548] Stack: [ 27.346685] ffffeafff9080020 ffff8801d9507c08 ffff8801c713d800 ffffeafff9080000 [ 27.354777] ffff8801b9d3ab58 ffff8801d95079c8 ffffffff8154cb8f ffff8801d9507c18 [ 27.362777] ffff8801d9507c10 ffff8801d9507c88 00003ffe420001e0 00000001c713d000 [ 27.370792] Call Trace: [ 27.373356] [] zap_huge_pmd+0x16f/0x860 [ 27.378965] [] unmap_page_range+0x12ad/0x1730 [ 27.385133] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.391613] [] unmap_single_vma+0x101/0x260 [ 27.397741] [] unmap_vmas+0x102/0x1d0 [ 27.403172] [] exit_mmap+0x214/0x3f0 [ 27.408647] [] ? SyS_munmap+0xa0/0xa0 [ 27.414173] [] ? up_write+0x1a/0x60 [ 27.419430] [] mmput+0xf3/0x2d0 [ 27.424354] [] do_exit+0x906/0x27b0 [ 27.429618] [] ? release_task.part.19+0x1210/0x1210 [ 27.436261] [] ? up_write+0x1a/0x60 [ 27.441518] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.447684] [] ? mprotect_fixup+0x930/0x930 [ 27.453661] [] do_group_exit+0x111/0x340 [ 27.459428] [] ? do_group_exit+0x340/0x340 [ 27.465291] [] SyS_exit_group+0x1d/0x20 [ 27.470896] [] do_syscall_64+0x1a6/0x490 [ 27.476589] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.483527] 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 [ 27.510881] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.517212] RSP [ 27.520822] CR2: ffffeafff9080020 [ 27.524254] ---[ end trace 92cdcfec179ae2b8 ]--- [ 27.528985] Kernel panic - not syncing: Fatal exception [ 27.534649] Dumping ftrace buffer: [ 27.538174] (ftrace buffer empty) [ 27.541860] Kernel Offset: disabled [ 27.545464] Rebooting in 86400 seconds..