[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.350873] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.993647] random: sshd: uninitialized urandom read (32 bytes read) [ 16.175899] random: sshd: uninitialized urandom read (32 bytes read) [ 16.660251] random: sshd: uninitialized urandom read (32 bytes read) [ 31.177987] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 36.862361] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.958359] BUG: unable to handle kernel paging request at ffffeafff90d0020 [ 36.966489] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.973356] PGD 0 [ 36.975486] [ 36.977491] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.982334] Dumping ftrace buffer: [ 36.986108] (ftrace buffer empty) [ 36.989846] Modules linked in: [ 36.993689] CPU: 1 PID: 3809 Comm: syz-executor769 Not tainted 4.9.122-g54068d6 #78 [ 37.002322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.012623] task: ffff8801b7ff0000 task.stack: ffff8801d57c8000 [ 37.019446] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 37.028700] RSP: 0018:ffff8801d57cf948 EFLAGS: 00010246 [ 37.034562] RAX: dffffc0000000000 RBX: ffffeafff90d0000 RCX: 0000000000000000 [ 37.042916] RDX: 1ffffd5fff21a004 RSI: ffffffff814f5918 RDI: ffffeafff90d0000 [ 37.050430] RBP: ffff8801d57cf970 R08: 0000000000034400 R09: 0000000000000001 [ 37.058002] R10: ffff8801b7ff0000 R11: 0000000000000001 R12: ffff8801d57cfc08 [ 37.065593] R13: ffffeafff90d0020 R14: ffffeafff90d0000 R15: 0000000000000001 [ 37.072859] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.081099] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.087174] CR2: ffffeafff90d0020 CR3: 00000001c724d000 CR4: 00000000001606f0 [ 37.094547] Stack: [ 37.096871] ffffeafff90d0020 ffff8801d57cfc08 ffff8801c7313800 ffffeafff90d0000 [ 37.105077] ffff8801c80f1738 ffff8801d57cf9c8 ffffffff8154cb8f ffff8801d57cfc18 [ 37.113341] ffff8801d57cfc10 ffff8801d57cfc88 00003ffe434001e0 00000001c7313000 [ 37.121832] Call Trace: [ 37.124508] [] zap_huge_pmd+0x16f/0x860 [ 37.130375] [] unmap_page_range+0x12ad/0x1730 [ 37.136915] [] ? vm_normal_page_pmd+0x310/0x310 [ 37.143237] [] unmap_single_vma+0x101/0x260 [ 37.149206] [] unmap_vmas+0x102/0x1d0 [ 37.154856] [] exit_mmap+0x214/0x3f0 [ 37.160371] [] ? SyS_munmap+0xa0/0xa0 [ 37.166245] [] ? up_write+0x1a/0x60 [ 37.171515] [] mmput+0xf3/0x2d0 [ 37.176797] [] do_exit+0x906/0x27b0 [ 37.182068] [] ? release_task.part.19+0x1210/0x1210 [ 37.189145] [] ? up_write+0x1a/0x60 [ 37.194419] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.200728] [] ? mprotect_fixup+0x930/0x930 [ 37.206701] [] do_group_exit+0x111/0x340 [ 37.212414] [] ? do_group_exit+0x340/0x340 [ 37.218351] [] SyS_exit_group+0x1d/0x20 [ 37.223995] [] do_syscall_64+0x1a6/0x490 [ 37.229702] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.236928] 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 [ 37.266116] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.272918] RSP [ 37.276535] CR2: ffffeafff90d0020 [ 37.280219] ---[ end trace e96f7bdc0bb9b7a6 ]--- [ 37.284970] Kernel panic - not syncing: Fatal exception [ 37.291361] Dumping ftrace buffer: [ 37.294900] (ftrace buffer empty) [ 37.298757] Kernel Offset: disabled [ 37.302472] Rebooting in 86400 seconds..