[....] 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[ 13.171834] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.487737] random: sshd: uninitialized urandom read (32 bytes read) [ 17.794571] random: sshd: uninitialized urandom read (32 bytes read) [ 18.301307] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 23.937298] urandom_read: 1 callbacks suppressed [ 23.937302] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.021802] BUG: unable to handle kernel paging request at ffffeafff8ec8020 [ 24.029152] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.035494] PGD 0 [ 24.037447] [ 24.039075] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.043545] Dumping ftrace buffer: [ 24.047057] (ftrace buffer empty) [ 24.050804] Modules linked in: [ 24.054103] CPU: 0 PID: 3798 Comm: syz-executor304 Not tainted 4.9.122-g54068d6 #26 [ 24.061872] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.071259] task: ffff8801b61a9800 task.stack: ffff8801d9b78000 [ 24.077305] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.085990] RSP: 0018:ffff8801d9b7f948 EFLAGS: 00010246 [ 24.091419] RAX: dffffc0000000000 RBX: ffffeafff8ec8000 RCX: 0000000000000000 [ 24.098673] RDX: 1ffffd5fff1d9004 RSI: ffffffff814f5918 RDI: ffffeafff8ec8000 [ 24.105921] RBP: ffff8801d9b7f970 R08: 0000000000033d40 R09: 0000000000000001 [ 24.113172] R10: ffff8801b61a9800 R11: 0000000000000001 R12: ffff8801d9b7fc08 [ 24.120419] R13: ffffeafff8ec8020 R14: ffffeafff8ec8000 R15: 0000000000000001 [ 24.127668] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.135876] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.141739] CR2: ffffeafff8ec8020 CR3: 00000001c5afe000 CR4: 00000000001606f0 [ 24.148997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.156251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.163498] Stack: [ 24.165717] ffffeafff8ec8020 ffff8801d9b7fc08 ffff8801c5bfe800 ffffeafff8ec8000 [ 24.173891] ffff8801c47b7d10 ffff8801d9b7f9c8 ffffffff8154cb8f ffff8801d9b7fc18 [ 24.181881] ffff8801d9b7fc10 ffff8801d9b7fc88 00003ffe3b2001e0 00000001c5bfe000 [ 24.189923] Call Trace: [ 24.192505] [] zap_huge_pmd+0x16f/0x860 [ 24.198114] [] unmap_page_range+0x12ad/0x1730 [ 24.204339] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.210639] [] unmap_single_vma+0x101/0x260 [ 24.216594] [] unmap_vmas+0x102/0x1d0 [ 24.222028] [] exit_mmap+0x214/0x3f0 [ 24.227372] [] ? SyS_munmap+0xa0/0xa0 [ 24.232809] [] ? up_write+0x1a/0x60 [ 24.238062] [] mmput+0xf3/0x2d0 [ 24.242988] [] do_exit+0x906/0x27b0 [ 24.248242] [] ? release_task.part.19+0x1210/0x1210 [ 24.254955] [] ? up_write+0x1a/0x60 [ 24.260279] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.266413] [] ? mprotect_fixup+0x930/0x930 [ 24.272372] [] do_group_exit+0x111/0x340 [ 24.278066] [] ? do_group_exit+0x340/0x340 [ 24.284030] [] SyS_exit_group+0x1d/0x20 [ 24.289634] [] do_syscall_64+0x1a6/0x490 [ 24.295324] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.302220] 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 [ 24.329018] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.335351] RSP [ 24.338951] CR2: ffffeafff8ec8020 [ 24.342382] ---[ end trace 80093675ac667e45 ]--- [ 24.347115] Kernel panic - not syncing: Fatal exception [ 24.352801] Dumping ftrace buffer: [ 24.356319] (ftrace buffer empty) [ 24.360000] Kernel Offset: disabled [ 24.363601] Rebooting in 86400 seconds..