[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.275619] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.483977] random: sshd: uninitialized urandom read (32 bytes read) [ 16.806970] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.669415] random: sshd: uninitialized urandom read (32 bytes read) [ 17.812997] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 23.592202] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.676654] BUG: unable to handle kernel paging request at ffffeafff8dd0020 [ 23.684173] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.690602] PGD 0 [ 23.692562] [ 23.694198] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.698684] Dumping ftrace buffer: [ 23.702208] (ftrace buffer empty) [ 23.705905] Modules linked in: [ 23.709270] CPU: 0 PID: 3791 Comm: syz-executor944 Not tainted 4.9.120-gf85543b #76 [ 23.717047] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.726390] task: ffff8801b8273000 task.stack: ffff8801b5a88000 [ 23.732431] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.741150] RSP: 0018:ffff8801b5a8f948 EFLAGS: 00010246 [ 23.746768] RAX: dffffc0000000000 RBX: ffffeafff8dd0000 RCX: 0000000000000000 [ 23.754034] RDX: 1ffffd5fff1ba004 RSI: ffffffff814f5128 RDI: ffffeafff8dd0000 [ 23.761291] RBP: ffff8801b5a8f970 R08: 00000000000342e0 R09: 0000000000000001 [ 23.768548] R10: ffff8801b8273000 R11: 0000000000000001 R12: ffff8801b5a8fc08 [ 23.775804] R13: ffffeafff8dd0020 R14: ffffeafff8dd0000 R15: 0000000000000001 [ 23.783062] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.791323] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.797195] CR2: ffffeafff8dd0020 CR3: 00000001c52dd000 CR4: 00000000001606f0 [ 23.804464] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.811735] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.818991] Stack: [ 23.821138] ffffeafff8dd0020 ffff8801b5a8fc08 ffff8801c52de800 ffffeafff8dd0000 [ 23.829186] ffff8801b5f2fc08 ffff8801b5a8f9c8 ffffffff8154bfcf ffff8801b5a8fc18 [ 23.837263] ffff8801b5a8fc10 ffff8801b5a8fc88 00003ffe374001e0 00000001c52de000 [ 23.845314] Call Trace: [ 23.847892] [] zap_huge_pmd+0x16f/0x860 [ 23.853504] [] unmap_page_range+0x12ad/0x1730 [ 23.859638] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 23.865945] [] unmap_single_vma+0x101/0x260 [ 23.871955] [] unmap_vmas+0x102/0x1d0 [ 23.877391] [] exit_mmap+0x214/0x3f0 [ 23.882739] [] ? SyS_munmap+0xa0/0xa0 [ 23.888183] [] ? up_write+0x1a/0x60 [ 23.893447] [] mmput+0xf3/0x2d0 [ 23.898366] [] do_exit+0x906/0x27b0 [ 23.903629] [] ? release_task.part.19+0x1210/0x1210 [ 23.910281] [] ? up_write+0x1a/0x60 [ 23.915544] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.921674] [] ? mprotect_fixup+0x930/0x930 [ 23.927693] [] do_group_exit+0x111/0x340 [ 23.933392] [] ? do_group_exit+0x340/0x340 [ 23.939444] [] SyS_exit_group+0x1d/0x20 [ 23.945128] [] do_syscall_64+0x1a6/0x490 [ 23.950826] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.957733] 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 [ 23.985772] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.992140] RSP [ 23.995871] CR2: ffffeafff8dd0020 [ 23.999363] ---[ end trace 06eae680403105b0 ]--- [ 24.004124] Kernel panic - not syncing: Fatal exception [ 24.010129] Dumping ftrace buffer: [ 24.013715] (ftrace buffer empty) [ 24.017411] Kernel Offset: disabled [ 24.021023] Rebooting in 86400 seconds..