[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.485201] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.599070] random: sshd: uninitialized urandom read (32 bytes read) [ 17.851385] random: sshd: uninitialized urandom read (32 bytes read) [ 18.361211] random: sshd: uninitialized urandom read (32 bytes read) [ 37.812055] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. [ 43.280697] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 43.365028] BUG: unable to handle kernel paging request at ffffeafff9038020 [ 43.372683] IP: [] page_remove_rmap+0x37/0x6d0 [ 43.378953] PGD 0 [ 43.380901] [ 43.382521] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.386997] Dumping ftrace buffer: [ 43.390513] (ftrace buffer empty) [ 43.394199] Modules linked in: [ 43.397486] CPU: 1 PID: 3777 Comm: syz-executor733 Not tainted 4.9.121-g681e57b #77 [ 43.405371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.414813] task: ffff8801bd35c800 task.stack: ffff8801c9ba0000 [ 43.420846] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 43.429528] RSP: 0018:ffff8801c9ba7948 EFLAGS: 00010246 [ 43.434951] RAX: dffffc0000000000 RBX: ffffeafff9038000 RCX: 0000000000000000 [ 43.442200] RDX: 1ffffd5fff207004 RSI: ffffffff814f5278 RDI: ffffeafff9038000 [ 43.449446] RBP: ffff8801c9ba7970 R08: 0000000000034740 R09: 0000000000000001 [ 43.456696] R10: ffff8801bd35c800 R11: 0000000000000001 R12: ffff8801c9ba7c08 [ 43.463948] R13: ffffeafff9038020 R14: ffffeafff9038000 R15: 0000000000000001 [ 43.471211] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 43.479412] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.485267] CR2: ffffeafff9038020 CR3: 00000001c9991000 CR4: 00000000001606f0 [ 43.492526] Stack: [ 43.494675] ffffeafff9038020 ffff8801c9ba7c08 ffff8801ca8c8800 ffffeafff9038000 [ 43.502677] ffff8801bbb2f000 ffff8801c9ba79c8 ffffffff8154c20f ffff8801c9ba7c18 [ 43.510684] ffff8801c9ba7c10 ffff8801c9ba7c88 00003ffe40e001e0 00000001ca8c8000 [ 43.518730] Call Trace: [ 43.521306] [] zap_huge_pmd+0x16f/0x860 [ 43.526910] [] unmap_page_range+0x12ad/0x1730 [ 43.533035] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 43.539923] [] unmap_single_vma+0x101/0x260 [ 43.545870] [] unmap_vmas+0x102/0x1d0 [ 43.551345] [] exit_mmap+0x214/0x3f0 [ 43.556689] [] ? SyS_munmap+0xa0/0xa0 [ 43.562115] [] ? up_write+0x1a/0x60 [ 43.567442] [] mmput+0xf3/0x2d0 [ 43.572367] [] do_exit+0x906/0x27b0 [ 43.577619] [] ? release_task.part.19+0x1210/0x1210 [ 43.584265] [] ? up_write+0x1a/0x60 [ 43.589521] [] ? do_mprotect_pkey+0x71d/0x890 [ 43.595645] [] ? mprotect_fixup+0x930/0x930 [ 43.601597] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 43.609110] [] do_group_exit+0x111/0x340 [ 43.614906] [] ? do_group_exit+0x340/0x340 [ 43.620773] [] SyS_exit_group+0x1d/0x20 [ 43.626378] [] do_syscall_64+0x1a6/0x490 [ 43.632072] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.638970] 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 [ 43.665942] RIP [] page_remove_rmap+0x37/0x6d0 [ 43.672275] RSP [ 43.675870] CR2: ffffeafff9038020 [ 43.679314] ---[ end trace 00e9e12419b4ba37 ]--- [ 43.684041] Kernel panic - not syncing: Fatal exception [ 43.689919] Dumping ftrace buffer: [ 43.693438] (ftrace buffer empty) [ 43.697124] Kernel Offset: disabled [ 43.700729] Rebooting in 86400 seconds..