[....] 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[ 13.473067] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.708429] random: sshd: uninitialized urandom read (32 bytes read) [ 20.008562] random: sshd: uninitialized urandom read (32 bytes read) [ 20.530577] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 26.326012] urandom_read: 1 callbacks suppressed [ 26.326016] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.410723] BUG: unable to handle kernel paging request at ffffeafff91d8020 [ 26.418086] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.424427] PGD 0 [ 26.426379] [ 26.428002] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.432472] Dumping ftrace buffer: [ 26.435984] (ftrace buffer empty) [ 26.439669] Modules linked in: [ 26.442953] CPU: 0 PID: 3801 Comm: syz-executor730 Not tainted 4.9.122-g54068d6 #26 [ 26.450720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.460296] task: ffff8801b9341800 task.stack: ffff8801b7fc0000 [ 26.466332] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.475009] RSP: 0018:ffff8801b7fc7948 EFLAGS: 00010246 [ 26.480434] RAX: dffffc0000000000 RBX: ffffeafff91d8000 RCX: 0000000000000000 [ 26.487678] RDX: 1ffffd5fff23b004 RSI: ffffffff814f5918 RDI: ffffeafff91d8000 [ 26.494923] RBP: ffff8801b7fc7970 R08: 00000000000339c0 R09: 0000000000000001 [ 26.502166] R10: ffff8801b9341800 R11: 0000000000000001 R12: ffff8801b7fc7c08 [ 26.509410] R13: ffffeafff91d8020 R14: ffffeafff91d8000 R15: 0000000000000001 [ 26.516656] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.524925] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.530797] CR2: ffffeafff91d8020 CR3: 00000001b7350000 CR4: 00000000001606f0 [ 26.538042] Stack: [ 26.540181] ffffeafff91d8020 ffff8801b7fc7c08 ffff8801c969c800 ffffeafff91d8000 [ 26.548181] ffff8801b6ddd9f8 ffff8801b7fc79c8 ffffffff8154cb8f ffff8801b7fc7c18 [ 26.556176] ffff8801b7fc7c10 ffff8801b7fc7c88 00003ffe476001e0 00000001c969c000 [ 26.564187] Call Trace: [ 26.566755] [] zap_huge_pmd+0x16f/0x860 [ 26.572445] [] unmap_page_range+0x12ad/0x1730 [ 26.578575] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.584881] [] unmap_single_vma+0x101/0x260 [ 26.590838] [] unmap_vmas+0x102/0x1d0 [ 26.596263] [] exit_mmap+0x214/0x3f0 [ 26.601607] [] ? SyS_munmap+0xa0/0xa0 [ 26.607035] [] ? up_write+0x1a/0x60 [ 26.612366] [] mmput+0xf3/0x2d0 [ 26.617282] [] do_exit+0x906/0x27b0 [ 26.622546] [] ? release_task.part.19+0x1210/0x1210 [ 26.629209] [] ? up_write+0x1a/0x60 [ 26.634517] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.640669] [] ? mprotect_fixup+0x930/0x930 [ 26.646634] [] do_group_exit+0x111/0x340 [ 26.652365] [] ? do_group_exit+0x340/0x340 [ 26.658330] [] SyS_exit_group+0x1d/0x20 [ 26.663932] [] do_syscall_64+0x1a6/0x490 [ 26.669653] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.676553] 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 [ 26.703474] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.709813] RSP [ 26.713428] CR2: ffffeafff91d8020 [ 26.716868] ---[ end trace 2d342bb93198971b ]--- [ 26.721606] Kernel panic - not syncing: Fatal exception [ 26.727297] Dumping ftrace buffer: [ 26.730831] (ftrace buffer empty) [ 26.734516] Kernel Offset: disabled [ 26.738121] Rebooting in 86400 seconds..