[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.085093] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.537365] random: sshd: uninitialized urandom read (32 bytes read) [ 25.007595] random: sshd: uninitialized urandom read (32 bytes read) [ 25.583952] random: sshd: uninitialized urandom read (32 bytes read) [ 28.502747] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 34.131118] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.215769] BUG: unable to handle kernel paging request at ffffeafff8f88020 [ 34.223130] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.229412] PGD 0 [ 34.231459] [ 34.233227] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.237699] Dumping ftrace buffer: [ 34.241257] (ftrace buffer empty) [ 34.244953] Modules linked in: [ 34.248244] CPU: 1 PID: 3797 Comm: syz-executor284 Not tainted 4.9.122-g54068d6 #78 [ 34.256066] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.265517] task: ffff8801ba0be000 task.stack: ffff8801c53e0000 [ 34.271550] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.280234] RSP: 0018:ffff8801c53e7948 EFLAGS: 00010246 [ 34.285662] RAX: dffffc0000000000 RBX: ffffeafff8f88000 RCX: 0000000000000000 [ 34.292913] RDX: 1ffffd5fff1f1004 RSI: ffffffff814f5918 RDI: ffffeafff8f88000 [ 34.300163] RBP: ffff8801c53e7970 R08: 0000000000033e80 R09: 0000000000000001 [ 34.307407] R10: ffff8801ba0be000 R11: 0000000000000001 R12: ffff8801c53e7c08 [ 34.314651] R13: ffffeafff8f88020 R14: ffffeafff8f88000 R15: 0000000000000001 [ 34.321898] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.330173] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.336042] CR2: ffffeafff8f88020 CR3: 00000001c4326000 CR4: 00000000001606f0 [ 34.343293] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.350537] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.357778] Stack: [ 34.359902] ffffeafff8f88020 ffff8801c53e7c08 ffff8801ca474800 ffffeafff8f88000 [ 34.367926] ffff8801bba35630 ffff8801c53e79c8 ffffffff8154cb8f ffff8801c53e7c18 [ 34.375938] ffff8801c53e7c10 ffff8801c53e7c88 00003ffe3e2001e0 00000001ca474000 [ 34.384047] Call Trace: [ 34.386619] [] zap_huge_pmd+0x16f/0x860 [ 34.392226] [] unmap_page_range+0x12ad/0x1730 [ 34.398351] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.404649] [] unmap_single_vma+0x101/0x260 [ 34.410610] [] unmap_vmas+0x102/0x1d0 [ 34.416061] [] exit_mmap+0x214/0x3f0 [ 34.421406] [] ? SyS_munmap+0xa0/0xa0 [ 34.426839] [] ? up_write+0x1a/0x60 [ 34.432097] [] mmput+0xf3/0x2d0 [ 34.437018] [] do_exit+0x906/0x27b0 [ 34.442275] [] ? release_task.part.19+0x1210/0x1210 [ 34.448930] [] ? up_write+0x1a/0x60 [ 34.454255] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.460380] [] ? mprotect_fixup+0x930/0x930 [ 34.466332] [] do_group_exit+0x111/0x340 [ 34.472019] [] ? do_group_exit+0x340/0x340 [ 34.477884] [] SyS_exit_group+0x1d/0x20 [ 34.483601] [] do_syscall_64+0x1a6/0x490 [ 34.489336] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.496242] Code: 55 41 54 53 48 89 fb e8 58 b4 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 23 b4 e6 [ 34.523543] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.529892] RSP [ 34.533618] CR2: ffffeafff8f88020 [ 34.537060] ---[ end trace 889d32faa890f314 ]--- [ 34.541789] Kernel panic - not syncing: Fatal exception [ 34.547494] Dumping ftrace buffer: [ 34.551016] (ftrace buffer empty) [ 34.554707] Kernel Offset: disabled [ 34.558306] Rebooting in 86400 seconds..