[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.688546] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.086690] random: sshd: uninitialized urandom read (32 bytes read) [ 19.630782] random: sshd: uninitialized urandom read (32 bytes read) [ 20.138944] random: sshd: uninitialized urandom read (32 bytes read) [ 30.523908] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 36.064691] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.149309] BUG: unable to handle kernel paging request at ffffeafff9100020 [ 36.156677] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.162932] PGD 0 [ 36.164876] [ 36.166512] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.170979] Dumping ftrace buffer: [ 36.174495] (ftrace buffer empty) [ 36.178177] Modules linked in: [ 36.181460] CPU: 1 PID: 3808 Comm: syz-executor492 Not tainted 4.9.120-gf85543b #76 [ 36.189224] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.198554] task: ffff8801b7cf1800 task.stack: ffff8801b6918000 [ 36.204581] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.213255] RSP: 0018:ffff8801b691f948 EFLAGS: 00010246 [ 36.218671] RAX: dffffc0000000000 RBX: ffffeafff9100000 RCX: 0000000000000000 [ 36.225912] RDX: 1ffffd5fff220004 RSI: ffffffff814f5128 RDI: ffffeafff9100000 [ 36.233153] RBP: ffff8801b691f970 R08: 0000000000034140 R09: 0000000000000001 [ 36.240395] R10: ffff8801b7cf1800 R11: 0000000000000001 R12: ffff8801b691fc08 [ 36.247636] R13: ffffeafff9100020 R14: ffffeafff9100000 R15: 0000000000000001 [ 36.254882] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.263080] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.268933] CR2: ffffeafff9100020 CR3: 00000001c5cd3000 CR4: 00000000001606f0 [ 36.276177] Stack: [ 36.278301] ffffeafff9100020 ffff8801b691fc08 ffff8801c5c3f800 ffffeafff9100000 [ 36.286422] ffff8801b7c399a0 ffff8801b691f9c8 ffffffff8154bfcf ffff8801b691fc18 [ 36.294421] ffff8801b691fc10 ffff8801b691fc88 00003ffe440001e0 00000001c5c3f000 [ 36.302794] Call Trace: [ 36.305365] [] zap_huge_pmd+0x16f/0x860 [ 36.310991] [] unmap_page_range+0x12ad/0x1730 [ 36.317125] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 36.323521] [] unmap_single_vma+0x101/0x260 [ 36.329467] [] unmap_vmas+0x102/0x1d0 [ 36.334888] [] exit_mmap+0x214/0x3f0 [ 36.340224] [] ? SyS_munmap+0xa0/0xa0 [ 36.345651] [] ? up_write+0x1a/0x60 [ 36.350900] [] mmput+0xf3/0x2d0 [ 36.355805] [] do_exit+0x906/0x27b0 [ 36.361053] [] ? release_task.part.19+0x1210/0x1210 [ 36.367705] [] ? up_write+0x1a/0x60 [ 36.372958] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.379081] [] ? mprotect_fixup+0x930/0x930 [ 36.385039] [] do_group_exit+0x111/0x340 [ 36.390729] [] ? do_group_exit+0x340/0x340 [ 36.396591] [] SyS_exit_group+0x1d/0x20 [ 36.402187] [] do_syscall_64+0x1a6/0x490 [ 36.407874] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.414768] 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 [ 36.441556] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.447888] RSP [ 36.451483] CR2: ffffeafff9100020 [ 36.454908] ---[ end trace f08aa136f1176535 ]--- [ 36.459636] Kernel panic - not syncing: Fatal exception [ 36.465282] Dumping ftrace buffer: [ 36.468799] (ftrace buffer empty) [ 36.472505] Kernel Offset: disabled [ 36.476110] Rebooting in 86400 seconds..