[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.544159] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.774858] random: sshd: uninitialized urandom read (32 bytes read) [ 19.260855] random: sshd: uninitialized urandom read (32 bytes read) [ 19.788870] random: sshd: uninitialized urandom read (32 bytes read) [ 19.929092] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 25.740164] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.822510] BUG: unable to handle kernel paging request at ffffeafff8f98020 [ 25.830236] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.836504] PGD 0 [ 25.838449] [ 25.840070] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.844544] Dumping ftrace buffer: [ 25.848073] (ftrace buffer empty) [ 25.851756] Modules linked in: [ 25.855041] CPU: 1 PID: 3786 Comm: syz-executor443 Not tainted 4.9.120-gf85543b #24 [ 25.862814] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.872144] task: ffff8801b9b08000 task.stack: ffff8801c6f60000 [ 25.878169] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.886841] RSP: 0018:ffff8801c6f67948 EFLAGS: 00010246 [ 25.892286] RAX: dffffc0000000000 RBX: ffffeafff8f98000 RCX: ffffea0007060000 [ 25.899543] RDX: 1ffffd5fff1f3004 RSI: ffffffff814f5128 RDI: ffffeafff8f98000 [ 25.906792] RBP: ffff8801c6f67970 R08: 0000000000034200 R09: 0000000000000001 [ 25.914108] R10: ffff8801b9b08000 R11: 0000000000000001 R12: ffff8801c6f67c08 [ 25.921357] R13: ffffeafff8f98020 R14: ffffeafff8f98000 R15: 0000000000000001 [ 25.928604] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.936803] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.942659] CR2: ffffeafff8f98020 CR3: 00000001c1c05000 CR4: 00000000001606f0 [ 25.949902] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.957150] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.964409] Stack: [ 25.966534] ffffeafff8f98020 ffff8801c6f67c08 ffff8801be648808 ffffeafff8f98000 [ 25.974514] ffff8801be640058 ffff8801c6f679c8 ffffffff8154bfcf ffff8801c6f67c18 [ 25.982553] ffff8801c6f67c10 ffff8801c6f67c88 00003ffe3e6001a0 00000001be648000 [ 25.990532] Call Trace: [ 25.993095] [] zap_huge_pmd+0x16f/0x860 [ 25.998695] [] unmap_page_range+0x12ad/0x1730 [ 26.004924] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.011214] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 26.018112] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.025070] [] unmap_single_vma+0x101/0x260 [ 26.031059] [] unmap_vmas+0x102/0x1d0 [ 26.036491] [] exit_mmap+0x214/0x3f0 [ 26.041833] [] ? SyS_munmap+0xa0/0xa0 [ 26.047272] [] ? up_write+0x1a/0x60 [ 26.052536] [] mmput+0xf3/0x2d0 [ 26.057438] [] do_exit+0x906/0x27b0 [ 26.062687] [] ? release_task.part.19+0x1210/0x1210 [ 26.069343] [] ? up_write+0x1a/0x60 [ 26.074597] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.080781] [] ? mprotect_fixup+0x930/0x930 [ 26.086732] [] do_group_exit+0x111/0x340 [ 26.092418] [] ? do_group_exit+0x340/0x340 [ 26.098276] [] SyS_exit_group+0x1d/0x20 [ 26.103873] [] do_syscall_64+0x1a6/0x490 [ 26.109570] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.116464] 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 [ 26.143467] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.149796] RSP [ 26.153394] CR2: ffffeafff8f98020 [ 26.156821] ---[ end trace 957f1bbccc4d739a ]--- [ 26.161545] Kernel panic - not syncing: Fatal exception [ 26.167213] Dumping ftrace buffer: [ 26.170729] (ftrace buffer empty) [ 26.174416] Kernel Offset: disabled [ 26.178022] Rebooting in 86400 seconds..