[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.378678] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.018053] random: sshd: uninitialized urandom read (32 bytes read) [ 19.326423] random: sshd: uninitialized urandom read (32 bytes read) [ 19.778289] random: sshd: uninitialized urandom read (32 bytes read) [ 37.464065] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 43.062541] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.181294] BUG: unable to handle kernel paging request at ffffeafff9188020 [ 43.188810] IP: [] page_remove_rmap+0x37/0x6d0 [ 43.195068] PGD 0 [ 43.197014] [ 43.198637] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.203107] Dumping ftrace buffer: [ 43.206625] (ftrace buffer empty) [ 43.210324] Modules linked in: [ 43.213616] CPU: 0 PID: 3809 Comm: syz-executor183 Not tainted 4.9.122-g54068d6 #78 [ 43.221382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.230719] task: ffff8801c3d99800 task.stack: ffff8801d9138000 [ 43.236746] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 43.245421] RSP: 0018:ffff8801d913f948 EFLAGS: 00010246 [ 43.250846] RAX: dffffc0000000000 RBX: ffffeafff9188000 RCX: 0000000000000000 [ 43.258091] RDX: 1ffffd5fff231004 RSI: ffffffff814f5918 RDI: ffffeafff9188000 [ 43.265335] RBP: ffff8801d913f970 R08: 0000000000034bc0 R09: 0000000000000001 [ 43.272581] R10: ffff8801c3d99800 R11: 0000000000000001 R12: ffff8801d913fc08 [ 43.279830] R13: ffffeafff9188020 R14: ffffeafff9188000 R15: 0000000000000001 [ 43.287077] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 43.295290] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.301162] CR2: ffffeafff9188020 CR3: 00000001d5246000 CR4: 00000000001606f0 [ 43.308408] Stack: [ 43.310533] ffffeafff9188020 ffff8801d913fc08 ffff8801b669d800 ffffeafff9188000 [ 43.318533] ffff8801b603d0b0 ffff8801d913f9c8 ffffffff8154cb8f ffff8801d913fc18 [ 43.326588] ffff8801d913fc10 ffff8801d913fc88 00003ffe462001e0 00000001b669d000 [ 43.334632] Call Trace: [ 43.337198] [] zap_huge_pmd+0x16f/0x860 [ 43.342801] [] unmap_page_range+0x12ad/0x1730 [ 43.348932] [] ? vm_normal_page_pmd+0x310/0x310 [ 43.355230] [] unmap_single_vma+0x101/0x260 [ 43.361191] [] unmap_vmas+0x102/0x1d0 [ 43.366616] [] exit_mmap+0x214/0x3f0 [ 43.371955] [] ? SyS_munmap+0xa0/0xa0 [ 43.377409] [] ? up_write+0x1a/0x60 [ 43.382666] [] mmput+0xf3/0x2d0 [ 43.387578] [] do_exit+0x906/0x27b0 [ 43.392842] [] ? release_task.part.19+0x1210/0x1210 [ 43.399484] [] ? up_write+0x1a/0x60 [ 43.404736] [] ? do_mprotect_pkey+0x71d/0x890 [ 43.410857] [] ? mprotect_fixup+0x930/0x930 [ 43.416808] [] do_group_exit+0x111/0x340 [ 43.422508] [] ? do_group_exit+0x340/0x340 [ 43.428383] [] SyS_exit_group+0x1d/0x20 [ 43.433984] [] do_syscall_64+0x1a6/0x490 [ 43.439674] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.446569] 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 [ 43.474449] RIP [] page_remove_rmap+0x37/0x6d0 [ 43.480792] RSP [ 43.484393] CR2: ffffeafff9188020 [ 43.487830] ---[ end trace 4c9ee53221e03c62 ]--- [ 43.492559] Kernel panic - not syncing: Fatal exception [ 43.498240] Dumping ftrace buffer: [ 43.501762] (ftrace buffer empty) [ 43.505445] Kernel Offset: disabled [ 43.509045] Rebooting in 86400 seconds..