[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.696332] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.220710] random: sshd: uninitialized urandom read (32 bytes read) [ 14.520507] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.013206] random: sshd: uninitialized urandom read (32 bytes read) [ 29.648126] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 35.167578] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.249281] BUG: unable to handle kernel paging request at ffffeafff8e08020 [ 35.256648] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.262898] PGD 0 [ 35.264948] [ 35.266578] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.271056] Dumping ftrace buffer: [ 35.274570] (ftrace buffer empty) [ 35.278708] Modules linked in: [ 35.282021] CPU: 1 PID: 3668 Comm: syz-executor769 Not tainted 4.9.120-gf85543b #24 [ 35.289790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.299121] task: ffff8801c4c00000 task.stack: ffff8801c4d80000 [ 35.305158] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.314068] RSP: 0018:ffff8801c4d87948 EFLAGS: 00010246 [ 35.319497] RAX: dffffc0000000000 RBX: ffffeafff8e08000 RCX: 0000000000000000 [ 35.326742] RDX: 1ffffd5fff1c1004 RSI: ffffffff814f5128 RDI: ffffeafff8e08000 [ 35.334090] RBP: ffff8801c4d87970 R08: 0000000000034260 R09: 0000000000000001 [ 35.341342] R10: ffff8801c4c00000 R11: 0000000000000001 R12: ffff8801c4d87c08 [ 35.348587] R13: ffffeafff8e08020 R14: ffffeafff8e08000 R15: 0000000000000001 [ 35.355848] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.364047] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.369915] CR2: ffffeafff8e08020 CR3: 00000001c78dd000 CR4: 00000000001606f0 [ 35.377232] Stack: [ 35.379359] ffffeafff8e08020 ffff8801c4d87c08 ffff8801c84e1800 ffffeafff8e08000 [ 35.387373] ffff8801c7865318 ffff8801c4d879c8 ffffffff8154bfcf ffff8801c4d87c18 [ 35.395374] ffff8801c4d87c10 ffff8801c4d87c88 00003ffe382001e0 00000001c84e1000 [ 35.403445] Call Trace: [ 35.406021] [] zap_huge_pmd+0x16f/0x860 [ 35.411629] [] unmap_page_range+0x12ad/0x1730 [ 35.417750] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 35.424051] [] unmap_single_vma+0x101/0x260 [ 35.430004] [] unmap_vmas+0x102/0x1d0 [ 35.435457] [] exit_mmap+0x214/0x3f0 [ 35.440806] [] ? SyS_munmap+0xa0/0xa0 [ 35.446236] [] ? up_write+0x1a/0x60 [ 35.451493] [] mmput+0xf3/0x2d0 [ 35.456474] [] do_exit+0x906/0x27b0 [ 35.461732] [] ? release_task.part.19+0x1210/0x1210 [ 35.468372] [] ? up_write+0x1a/0x60 [ 35.473622] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.479748] [] ? mprotect_fixup+0x930/0x930 [ 35.485702] [] ? SyS_pwrite64+0xe8/0x170 [ 35.491492] [] do_group_exit+0x111/0x340 [ 35.497247] [] ? do_group_exit+0x340/0x340 [ 35.503121] [] SyS_exit_group+0x1d/0x20 [ 35.508726] [] do_syscall_64+0x1a6/0x490 [ 35.514425] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.521324] 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 [ 35.548649] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.554977] RSP [ 35.558577] CR2: ffffeafff8e08020 [ 35.562023] ---[ end trace c95002ab3bfac008 ]--- [ 35.566757] Kernel panic - not syncing: Fatal exception [ 35.572419] Dumping ftrace buffer: [ 35.575940] (ftrace buffer empty) [ 35.579623] Kernel Offset: disabled [ 35.583229] Rebooting in 86400 seconds..