[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.859344] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.479222] random: sshd: uninitialized urandom read (32 bytes read) [ 23.094682] random: sshd: uninitialized urandom read (32 bytes read) [ 23.543297] random: sshd: uninitialized urandom read (32 bytes read) [ 23.674087] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 29.222308] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.298960] BUG: unable to handle kernel paging request at ffffeafff9048020 [ 29.306368] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.312716] PGD 0 [ 29.314676] [ 29.316313] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.320793] Dumping ftrace buffer: [ 29.324313] (ftrace buffer empty) [ 29.328027] Modules linked in: [ 29.331340] CPU: 0 PID: 3786 Comm: syz-executor024 Not tainted 4.9.120-gf85543b #76 [ 29.339132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.348548] task: ffff8801bb204800 task.stack: ffff8801c8f80000 [ 29.354596] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.363372] RSP: 0018:ffff8801c8f87948 EFLAGS: 00010246 [ 29.369014] RAX: dffffc0000000000 RBX: ffffeafff9048000 RCX: 0000000000000000 [ 29.376396] RDX: 1ffffd5fff209004 RSI: ffffffff814f5128 RDI: ffffeafff9048000 [ 29.383653] RBP: ffff8801c8f87970 R08: 0000000000033980 R09: 0000000000000001 [ 29.391085] R10: ffff8801bb204800 R11: 0000000000000001 R12: ffff8801c8f87c08 [ 29.398476] R13: ffffeafff9048020 R14: ffffeafff9048000 R15: 0000000000000001 [ 29.406010] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.414577] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.420578] CR2: ffffeafff9048020 CR3: 00000001c7221000 CR4: 00000000001606f0 [ 29.427842] Stack: [ 29.430011] ffffeafff9048020 ffff8801c8f87c08 ffff8801ca7f7800 ffffeafff9048000 [ 29.438345] ffff8801b8623420 ffff8801c8f879c8 ffffffff8154bfcf ffff8801c8f87c18 [ 29.446524] ffff8801c8f87c10 ffff8801c8f87c88 00003ffe412001e0 00000001ca7f7000 [ 29.454846] Call Trace: [ 29.457484] [] zap_huge_pmd+0x16f/0x860 [ 29.463098] [] unmap_page_range+0x12ad/0x1730 [ 29.469382] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.475692] [] unmap_single_vma+0x101/0x260 [ 29.481949] [] unmap_vmas+0x102/0x1d0 [ 29.487789] [] exit_mmap+0x214/0x3f0 [ 29.493140] [] ? SyS_munmap+0xa0/0xa0 [ 29.498580] [] mmput+0xf3/0x2d0 [ 29.503498] [] do_exit+0x906/0x27b0 [ 29.508762] [] ? release_task.part.19+0x1210/0x1210 [ 29.515503] [] ? up_write+0x1a/0x60 [ 29.520805] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.526937] [] ? mprotect_fixup+0x930/0x930 [ 29.532896] [] do_group_exit+0x111/0x340 [ 29.538670] [] ? do_group_exit+0x340/0x340 [ 29.544786] [] SyS_exit_group+0x1d/0x20 [ 29.550622] [] do_syscall_64+0x1a6/0x490 [ 29.556371] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.563385] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 29.592332] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.598697] RSP [ 29.602443] CR2: ffffeafff9048020 [ 29.605885] ---[ end trace 078ff4fec75e099d ]--- [ 29.610883] Kernel panic - not syncing: Fatal exception [ 29.616874] Dumping ftrace buffer: [ 29.620409] (ftrace buffer empty) [ 29.624232] Kernel Offset: disabled [ 29.627921] Rebooting in 86400 seconds..