[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.961422] 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: [ 21.335725] random: sshd: uninitialized urandom read (32 bytes read) [ 21.747403] random: sshd: uninitialized urandom read (32 bytes read) [ 22.278813] random: sshd: uninitialized urandom read (32 bytes read) [ 25.876166] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 31.667117] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.752058] BUG: unable to handle kernel paging request at ffffeafff9180020 [ 31.759419] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.765659] PGD 0 [ 31.767601] [ 31.769217] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.773682] Dumping ftrace buffer: [ 31.777194] (ftrace buffer empty) [ 31.780877] Modules linked in: [ 31.784165] CPU: 0 PID: 3805 Comm: syz-executor626 Not tainted 4.9.120-gf85543b #76 [ 31.791930] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.801288] task: ffff8801b722c800 task.stack: ffff8801b5f08000 [ 31.807313] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.815989] RSP: 0018:ffff8801b5f0f948 EFLAGS: 00010246 [ 31.821491] RAX: dffffc0000000000 RBX: ffffeafff9180000 RCX: 0000000000000000 [ 31.828943] RDX: 1ffffd5fff230004 RSI: ffffffff814f5128 RDI: ffffeafff9180000 [ 31.836196] RBP: ffff8801b5f0f970 R08: 0000000000034340 R09: 0000000000000001 [ 31.843454] R10: ffff8801b722c800 R11: 0000000000000001 R12: ffff8801b5f0fc08 [ 31.850807] R13: ffffeafff9180020 R14: ffffeafff9180000 R15: 0000000000000001 [ 31.858065] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.866271] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.872125] CR2: ffffeafff9180020 CR3: 00000001b8dd2000 CR4: 00000000001606f0 [ 31.879429] Stack: [ 31.881566] ffffeafff9180020 ffff8801b5f0fc08 ffff8801c45d9800 ffffeafff9180000 [ 31.889589] ffff8801c4496420 ffff8801b5f0f9c8 ffffffff8154bfcf ffff8801b5f0fc18 [ 31.897594] ffff8801b5f0fc10 ffff8801b5f0fc88 00003ffe460001e0 00000001c45d9000 [ 31.905685] Call Trace: [ 31.908254] [] zap_huge_pmd+0x16f/0x860 [ 31.913856] [] unmap_page_range+0x12ad/0x1730 [ 31.919977] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 31.926270] [] unmap_single_vma+0x101/0x260 [ 31.932215] [] unmap_vmas+0x102/0x1d0 [ 31.937660] [] exit_mmap+0x214/0x3f0 [ 31.943045] [] ? SyS_munmap+0xa0/0xa0 [ 31.948482] [] ? up_write+0x1a/0x60 [ 31.953738] [] mmput+0xf3/0x2d0 [ 31.958646] [] do_exit+0x906/0x27b0 [ 31.963967] [] ? release_task.part.19+0x1210/0x1210 [ 31.970614] [] ? up_write+0x1a/0x60 [ 31.975865] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.981985] [] ? mprotect_fixup+0x930/0x930 [ 31.987930] [] ? SyS_pwrite64+0xe8/0x170 [ 31.993779] [] do_group_exit+0x111/0x340 [ 31.999486] [] ? do_group_exit+0x340/0x340 [ 32.005356] [] SyS_exit_group+0x1d/0x20 [ 32.010979] [] do_syscall_64+0x1a6/0x490 [ 32.016724] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.023672] 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 [ 32.051107] RIP [] page_remove_rmap+0x37/0x6d0 [ 32.057499] RSP [ 32.061103] CR2: ffffeafff9180020 [ 32.064530] ---[ end trace 55a611dafb9dcc10 ]--- [ 32.069256] Kernel panic - not syncing: Fatal exception [ 32.074908] Dumping ftrace buffer: [ 32.078445] (ftrace buffer empty) [ 32.082137] Kernel Offset: disabled [ 32.085742] Rebooting in 86400 seconds..