[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.119480] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.951981] random: sshd: uninitialized urandom read (32 bytes read) [ 25.430502] random: sshd: uninitialized urandom read (32 bytes read) [ 25.833807] random: sshd: uninitialized urandom read (32 bytes read) [ 28.339114] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 33.873310] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.956460] BUG: unable to handle kernel paging request at ffffeafff91e8020 [ 33.963833] IP: [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 33.970078] PGD 0 [ 33.972028] [ 33.973656] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.978125] Dumping ftrace buffer: [ 33.981638] (ftrace buffer empty) [ 33.985320] Modules linked in: [ 33.988605] CPU: 1 PID: 3808 Comm: syz-executor095 Not tainted 4.9.121-g681e57b #25 [ 33.996372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.005720] task: ffff8801b6378000 task.stack: ffff8801b78a8000 [ 34.011752] RIP: 0010:[<ffffffff814f5297>] [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 34.020438] RSP: 0018:ffff8801b78af948 EFLAGS: 00010246 [ 34.025865] RAX: dffffc0000000000 RBX: ffffeafff91e8000 RCX: 0000000000000000 [ 34.033110] RDX: 1ffffd5fff23d004 RSI: ffffffff814f5278 RDI: ffffeafff91e8000 [ 34.040359] RBP: ffff8801b78af970 R08: 0000000000034120 R09: 0000000000000001 [ 34.047607] R10: ffff8801b6378000 R11: 0000000000000001 R12: ffff8801b78afc08 [ 34.054852] R13: ffffeafff91e8020 R14: ffffeafff91e8000 R15: 0000000000000001 [ 34.062102] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.070305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.076205] CR2: ffffeafff91e8020 CR3: 00000001c6b2a000 CR4: 00000000001606f0 [ 34.083467] Stack: [ 34.085594] ffffeafff91e8020 ffff8801b78afc08 ffff8801c5880800 ffffeafff91e8000 [ 34.093587] ffff8801c6bb73c8 ffff8801b78af9c8 ffffffff8154c20f ffff8801b78afc18 [ 34.101571] ffff8801b78afc10 ffff8801b78afc88 00003ffe47a001e0 00000001c5880000 [ 34.109563] Call Trace: [ 34.112139] [<ffffffff8154c20f>] zap_huge_pmd+0x16f/0x860 [ 34.117745] [<ffffffff814ca95d>] unmap_page_range+0x12ad/0x1730 [ 34.123869] [<ffffffff814c96b0>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 34.130166] [<ffffffff814caee1>] unmap_single_vma+0x101/0x260 [ 34.136174] [<ffffffff814cb822>] unmap_vmas+0x102/0x1d0 [ 34.141606] [<ffffffff814e4214>] exit_mmap+0x214/0x3f0 [ 34.146945] [<ffffffff814e4000>] ? SyS_munmap+0xa0/0xa0 [ 34.152378] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 34.157640] [<ffffffff8112d6f3>] mmput+0xf3/0x2d0 [ 34.162553] [<ffffffff81142c26>] do_exit+0x906/0x27b0 [ 34.167815] [<ffffffff81142320>] ? release_task.part.19+0x1210/0x1210 [ 34.174467] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 34.179778] [<ffffffff814ec78d>] ? do_mprotect_pkey+0x71d/0x890 [ 34.185905] [<ffffffff814ec070>] ? mprotect_fixup+0x930/0x930 [ 34.191855] [<ffffffff81148de1>] do_group_exit+0x111/0x340 [ 34.197542] [<ffffffff81149010>] ? do_group_exit+0x340/0x340 [ 34.203402] [<ffffffff8114902d>] SyS_exit_group+0x1d/0x20 [ 34.209006] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 34.214702] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.221641] 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 [ 34.248738] RIP [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 34.255074] RSP <ffff8801b78af948> [ 34.258675] CR2: ffffeafff91e8020 [ 34.262108] ---[ end trace 6f0198bd4597cfd1 ]--- [ 34.266834] Kernel panic - not syncing: Fatal exception [ 34.272492] Dumping ftrace buffer: [ 34.276533] (ftrace buffer empty) [ 34.280223] Kernel Offset: disabled [ 34.283824] Rebooting in 86400 seconds..