[....] 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[ 12.830651] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.273957] random: sshd: uninitialized urandom read (32 bytes read) [ 14.473406] random: sshd: uninitialized urandom read (32 bytes read) [ 14.986118] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 20.617219] urandom_read: 1 callbacks suppressed [ 20.617222] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.704321] BUG: unable to handle kernel paging request at ffffeafff8da8020 [ 20.711712] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.717970] PGD 0 [ 20.719914] [ 20.721540] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.726011] Dumping ftrace buffer: [ 20.729534] (ftrace buffer empty) [ 20.733218] Modules linked in: [ 20.736516] CPU: 0 PID: 3774 Comm: syz-executor425 Not tainted 4.9.122-g54068d6 #78 [ 20.744298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.753630] task: ffff8801baa09800 task.stack: ffff8801b9d08000 [ 20.759661] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.768342] RSP: 0018:ffff8801b9d0f948 EFLAGS: 00010246 [ 20.773764] RAX: dffffc0000000000 RBX: ffffeafff8da8000 RCX: ffffea0007220000 [ 20.781008] RDX: 1ffffd5fff1b5004 RSI: ffffffff814f5918 RDI: ffffeafff8da8000 [ 20.788254] RBP: ffff8801b9d0f970 R08: 0000000000033f20 R09: 0000000000000001 [ 20.795499] R10: ffff8801baa09800 R11: 0000000000000001 R12: ffff8801b9d0fc08 [ 20.802742] R13: ffffeafff8da8020 R14: ffffeafff8da8000 R15: 0000000000000001 [ 20.809991] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.818190] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.824046] CR2: ffffeafff8da8020 CR3: 00000001ccbb3000 CR4: 00000000001606f0 [ 20.831292] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.838538] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.845784] Stack: [ 20.847907] ffffeafff8da8020 ffff8801b9d0fc08 ffff8801c9dd9800 ffffeafff8da8000 [ 20.855905] ffff8801ba11a160 ffff8801b9d0f9c8 ffffffff8154cb8f ffff8801b9d0fc18 [ 20.863899] ffff8801b9d0fc10 ffff8801b9d0fc88 00003ffe36a001e0 00000001c9dd9000 [ 20.871888] Call Trace: [ 20.874456] [] zap_huge_pmd+0x16f/0x860 [ 20.880055] [] unmap_page_range+0x12ad/0x1730 [ 20.886179] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.892494] [] unmap_single_vma+0x101/0x260 [ 20.898457] [] unmap_vmas+0x102/0x1d0 [ 20.903883] [] exit_mmap+0x214/0x3f0 [ 20.909218] [] ? SyS_munmap+0xa0/0xa0 [ 20.914647] [] ? up_write+0x1a/0x60 [ 20.919901] [] mmput+0xf3/0x2d0 [ 20.924811] [] do_exit+0x906/0x27b0 [ 20.930061] [] ? release_task.part.19+0x1210/0x1210 [ 20.936724] [] ? up_write+0x1a/0x60 [ 20.941976] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.948095] [] ? mprotect_fixup+0x930/0x930 [ 20.954040] [] do_group_exit+0x111/0x340 [ 20.959727] [] ? do_group_exit+0x340/0x340 [ 20.965602] [] SyS_exit_group+0x1d/0x20 [ 20.971204] [] do_syscall_64+0x1a6/0x490 [ 20.976905] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.983807] 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 [ 21.010771] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.017099] RSP [ 21.020862] CR2: ffffeafff8da8020 [ 21.024294] ---[ end trace e23271414b191f61 ]--- [ 21.029019] Kernel panic - not syncing: Fatal exception [ 21.034720] Dumping ftrace buffer: [ 21.038237] (ftrace buffer empty) [ 21.041936] Kernel Offset: disabled [ 21.045539] Rebooting in 86400 seconds..