[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.289393] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.232928] random: sshd: uninitialized urandom read (32 bytes read) [ 15.563022] random: sshd: uninitialized urandom read (32 bytes read) [ 16.123721] random: sshd: uninitialized urandom read (32 bytes read) [ 16.266977] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 21.781995] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.870585] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 21.877950] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.884228] PGD 0 [ 21.886175] [ 21.887800] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.892271] Dumping ftrace buffer: [ 21.895784] (ftrace buffer empty) [ 21.899488] Modules linked in: [ 21.902785] CPU: 0 PID: 3793 Comm: syz-executor191 Not tainted 4.9.122-g54068d6 #26 [ 21.910554] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.919940] task: ffff8801b7d23000 task.stack: ffff8801b6ae0000 [ 21.925980] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.934682] RSP: 0018:ffff8801b6ae7948 EFLAGS: 00010246 [ 21.940105] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: 0000000000000000 [ 21.947372] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5918 RDI: ffffeafff9158000 [ 21.954653] RBP: ffff8801b6ae7970 R08: 0000000000033a00 R09: 0000000000000001 [ 21.961902] R10: ffff8801b7d23000 R11: 0000000000000001 R12: ffff8801b6ae7c08 [ 21.969152] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 21.976403] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.984609] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.990470] CR2: ffffeafff9158020 CR3: 00000001c3cf0000 CR4: 00000000001606f0 [ 21.997735] Stack: [ 21.999864] ffffeafff9158020 ffff8801b6ae7c08 ffff8801cd4ce800 ffffeafff9158000 [ 22.007881] ffff8801b5b24630 ffff8801b6ae79c8 ffffffff8154cb8f ffff8801b6ae7c18 [ 22.015895] ffff8801b6ae7c10 ffff8801b6ae7c88 00003ffe456001e0 00000001cd4ce000 [ 22.023886] Call Trace: [ 22.026469] [] zap_huge_pmd+0x16f/0x860 [ 22.032080] [] unmap_page_range+0x12ad/0x1730 [ 22.038220] [] ? vm_normal_page_pmd+0x310/0x310 [ 22.044536] [] unmap_single_vma+0x101/0x260 [ 22.050506] [] unmap_vmas+0x102/0x1d0 [ 22.055937] [] exit_mmap+0x214/0x3f0 [ 22.061287] [] ? SyS_munmap+0xa0/0xa0 [ 22.066747] [] ? up_write+0x1a/0x60 [ 22.072027] [] mmput+0xf3/0x2d0 [ 22.076955] [] do_exit+0x906/0x27b0 [ 22.082214] [] ? release_task.part.19+0x1210/0x1210 [ 22.088914] [] ? up_write+0x1a/0x60 [ 22.094178] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.100303] [] ? mprotect_fixup+0x930/0x930 [ 22.106260] [] do_group_exit+0x111/0x340 [ 22.111953] [] ? do_group_exit+0x340/0x340 [ 22.117816] [] SyS_exit_group+0x1d/0x20 [ 22.123424] [] do_syscall_64+0x1a6/0x490 [ 22.129164] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.136084] 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 [ 22.163755] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.170181] RSP [ 22.173784] CR2: ffffeafff9158020 [ 22.177354] ---[ end trace ab9bfa01ace2b40d ]--- [ 22.182095] Kernel panic - not syncing: Fatal exception [ 22.187689] Dumping ftrace buffer: [ 22.191206] (ftrace buffer empty) [ 22.194898] Kernel Offset: disabled [ 22.198506] Rebooting in 86400 seconds..