[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.588428] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.331968] random: sshd: uninitialized urandom read (32 bytes read) [ 20.752277] random: sshd: uninitialized urandom read (32 bytes read) [ 21.248405] random: sshd: uninitialized urandom read (32 bytes read) [ 33.706339] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 39.229457] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.322364] BUG: unable to handle kernel paging request at ffffeafff9280020 [ 39.329813] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.336076] PGD 0 [ 39.338022] [ 39.339645] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.344115] Dumping ftrace buffer: [ 39.347631] (ftrace buffer empty) [ 39.351315] Modules linked in: [ 39.354601] CPU: 1 PID: 3803 Comm: syz-executor746 Not tainted 4.9.121-g681e57b #77 [ 39.362369] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.371710] task: ffff8801d9600000 task.stack: ffff8801d9098000 [ 39.377745] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 39.386426] RSP: 0018:ffff8801d909f948 EFLAGS: 00010246 [ 39.391847] RAX: dffffc0000000000 RBX: ffffeafff9280000 RCX: ffffea0006d78000 [ 39.399136] RDX: 1ffffd5fff250004 RSI: ffffffff814f5278 RDI: ffffeafff9280000 [ 39.406460] RBP: ffff8801d909f970 R08: 0000000000034280 R09: 0000000000000001 [ 39.413711] R10: ffff8801d9600000 R11: 0000000000000001 R12: ffff8801d909fc08 [ 39.420961] R13: ffffeafff9280020 R14: ffffeafff9280000 R15: 0000000000000001 [ 39.428209] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.436489] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.442351] CR2: ffffeafff9280020 CR3: 00000001c2eb6000 CR4: 00000000001606f0 [ 39.449595] Stack: [ 39.451722] ffffeafff9280020 ffff8801d909fc08 ffff8801c6f33810 ffffeafff9280000 [ 39.459725] ffff8801b72741b8 ffff8801d909f9c8 ffffffff8154c20f ffff8801d909fc18 [ 39.467777] ffff8801d909fc10 ffff8801d909fc88 00003ffe4a0001a0 00000001c6f33000 [ 39.475815] Call Trace: [ 39.478393] [] zap_huge_pmd+0x16f/0x860 [ 39.484002] [] unmap_page_range+0x12ad/0x1730 [ 39.490133] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 39.496434] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 39.503347] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 39.510210] [] unmap_single_vma+0x101/0x260 [ 39.516177] [] unmap_vmas+0x102/0x1d0 [ 39.521610] [] exit_mmap+0x214/0x3f0 [ 39.526950] [] ? SyS_munmap+0xa0/0xa0 [ 39.532378] [] ? up_write+0x1a/0x60 [ 39.537630] [] mmput+0xf3/0x2d0 [ 39.542537] [] do_exit+0x906/0x27b0 [ 39.547795] [] ? release_task.part.19+0x1210/0x1210 [ 39.554443] [] ? up_write+0x1a/0x60 [ 39.559698] [] ? do_mprotect_pkey+0x71d/0x890 [ 39.565821] [] ? mprotect_fixup+0x930/0x930 [ 39.571774] [] do_group_exit+0x111/0x340 [ 39.577460] [] ? do_group_exit+0x340/0x340 [ 39.583323] [] SyS_exit_group+0x1d/0x20 [ 39.588926] [] do_syscall_64+0x1a6/0x490 [ 39.594617] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.601518] 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 [ 39.628486] RIP [] page_remove_rmap+0x37/0x6d0 [ 39.634822] RSP [ 39.638418] CR2: ffffeafff9280020 [ 39.641886] ---[ end trace 62698100f166e447 ]--- [ 39.646617] Kernel panic - not syncing: Fatal exception [ 39.652275] Dumping ftrace buffer: [ 39.655797] (ftrace buffer empty) [ 39.659479] Kernel Offset: disabled [ 39.663084] Rebooting in 86400 seconds..