[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.312914] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.244871] random: sshd: uninitialized urandom read (32 bytes read) [ 16.611270] random: sshd: uninitialized urandom read (32 bytes read) [ 17.128335] random: sshd: uninitialized urandom read (32 bytes read) [ 17.275785] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 22.863916] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.948585] BUG: unable to handle kernel paging request at ffffeafff91b8020 [ 22.955977] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.962232] PGD 0 [ 22.964182] [ 22.965810] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.970283] Dumping ftrace buffer: [ 22.973799] (ftrace buffer empty) [ 22.977487] Modules linked in: [ 22.980776] CPU: 1 PID: 3801 Comm: syz-executor061 Not tainted 4.9.121-g681e57b #25 [ 22.988543] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.997874] task: ffff8801b7561800 task.stack: ffff8801b6220000 [ 23.003902] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.012576] RSP: 0018:ffff8801b6227948 EFLAGS: 00010246 [ 23.017999] RAX: dffffc0000000000 RBX: ffffeafff91b8000 RCX: 0000000000000000 [ 23.025246] RDX: 1ffffd5fff237004 RSI: ffffffff814f5278 RDI: ffffeafff91b8000 [ 23.032496] RBP: ffff8801b6227970 R08: 00000000000339e0 R09: 0000000000000001 [ 23.039742] R10: ffff8801b7561800 R11: 0000000000000001 R12: ffff8801b6227c08 [ 23.046985] R13: ffffeafff91b8020 R14: ffffeafff91b8000 R15: 0000000000000001 [ 23.054352] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 23.062559] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.068422] CR2: ffffeafff91b8020 CR3: 00000001c9bae000 CR4: 00000000001606f0 [ 23.075673] Stack: [ 23.077807] ffffeafff91b8020 ffff8801b6227c08 ffff8801b77d4800 ffffeafff91b8000 [ 23.085821] ffff8801b7e38898 ffff8801b62279c8 ffffffff8154c20f ffff8801b6227c18 [ 23.093825] ffff8801b6227c10 ffff8801b6227c88 00003ffe46e001e0 00000001b77d4000 [ 23.101824] Call Trace: [ 23.104392] [] zap_huge_pmd+0x16f/0x860 [ 23.110000] [] unmap_page_range+0x12ad/0x1730 [ 23.116127] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 23.122427] [] unmap_single_vma+0x101/0x260 [ 23.128377] [] unmap_vmas+0x102/0x1d0 [ 23.133802] [] exit_mmap+0x214/0x3f0 [ 23.139141] [] ? SyS_munmap+0xa0/0xa0 [ 23.144572] [] ? up_write+0x1a/0x60 [ 23.149831] [] mmput+0xf3/0x2d0 [ 23.154744] [] do_exit+0x906/0x27b0 [ 23.160011] [] ? release_task.part.19+0x1210/0x1210 [ 23.166709] [] ? up_write+0x1a/0x60 [ 23.171987] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.178115] [] ? mprotect_fixup+0x930/0x930 [ 23.184111] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 23.191632] [] do_group_exit+0x111/0x340 [ 23.197381] [] ? do_group_exit+0x340/0x340 [ 23.203248] [] SyS_exit_group+0x1d/0x20 [ 23.208851] [] do_syscall_64+0x1a6/0x490 [ 23.214539] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.221440] 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 [ 23.248525] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.254860] RSP [ 23.258463] CR2: ffffeafff91b8020 [ 23.261904] ---[ end trace f2b6af762f29b12f ]--- [ 23.266678] Kernel panic - not syncing: Fatal exception [ 23.272328] Dumping ftrace buffer: [ 23.275853] (ftrace buffer empty) [ 23.279539] Kernel Offset: disabled [ 23.283148] Rebooting in 86400 seconds..