[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.088326] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.638283] random: sshd: uninitialized urandom read (32 bytes read) [ 23.932000] random: sshd: uninitialized urandom read (32 bytes read) [ 24.326354] random: sshd: uninitialized urandom read (32 bytes read) [ 51.151564] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 56.627191] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 56.713536] BUG: unable to handle kernel paging request at ffffeafff9138020 [ 56.720893] IP: [] page_remove_rmap+0x37/0x6d0 [ 56.727219] PGD 0 [ 56.729173] [ 56.730862] Oops: 0000 [#1] PREEMPT SMP KASAN [ 56.735337] Dumping ftrace buffer: [ 56.738851] (ftrace buffer empty) [ 56.742538] Modules linked in: [ 56.745835] CPU: 0 PID: 3822 Comm: syz-executor417 Not tainted 4.9.122-g54068d6 #78 [ 56.753628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.762967] task: ffff8801b7930000 task.stack: ffff8801d8c38000 [ 56.769007] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 56.777708] RSP: 0018:ffff8801d8c3f948 EFLAGS: 00010246 [ 56.783137] RAX: dffffc0000000000 RBX: ffffeafff9138000 RCX: 0000000000000000 [ 56.790441] RDX: 1ffffd5fff227004 RSI: ffffffff814f5918 RDI: ffffeafff9138000 [ 56.797791] RBP: ffff8801d8c3f970 R08: 0000000000034a20 R09: 0000000000000001 [ 56.805041] R10: ffff8801b7930000 R11: 0000000000000001 R12: ffff8801d8c3fc08 [ 56.812288] R13: ffffeafff9138020 R14: ffffeafff9138000 R15: 0000000000000001 [ 56.819537] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 56.827740] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.833694] CR2: ffffeafff9138020 CR3: 00000001ba4bf000 CR4: 00000000001606f0 [ 56.840942] Stack: [ 56.843068] ffffeafff9138020 ffff8801d8c3fc08 ffff8801ba437800 ffffeafff9138000 [ 56.851066] ffff8801cc542cb8 ffff8801d8c3f9c8 ffffffff8154cb8f ffff8801d8c3fc18 [ 56.859066] ffff8801d8c3fc10 ffff8801d8c3fc88 00003ffe44e001e0 00000001ba437000 [ 56.867076] Call Trace: [ 56.869655] [] zap_huge_pmd+0x16f/0x860 [ 56.875307] [] unmap_page_range+0x12ad/0x1730 [ 56.881484] [] ? vm_normal_page_pmd+0x310/0x310 [ 56.887887] [] unmap_single_vma+0x101/0x260 [ 56.893849] [] unmap_vmas+0x102/0x1d0 [ 56.899279] [] exit_mmap+0x214/0x3f0 [ 56.904618] [] ? SyS_munmap+0xa0/0xa0 [ 56.910051] [] ? up_write+0x1a/0x60 [ 56.915381] [] mmput+0xf3/0x2d0 [ 56.920294] [] do_exit+0x906/0x27b0 [ 56.925551] [] ? release_task.part.19+0x1210/0x1210 [ 56.932237] [] ? up_write+0x1a/0x60 [ 56.937500] [] ? do_mprotect_pkey+0x71d/0x890 [ 56.943625] [] ? mprotect_fixup+0x930/0x930 [ 56.949582] [] do_group_exit+0x111/0x340 [ 56.955349] [] ? do_group_exit+0x340/0x340 [ 56.961227] [] SyS_exit_group+0x1d/0x20 [ 56.966838] [] do_syscall_64+0x1a6/0x490 [ 56.972560] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 56.979465] 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 [ 57.006468] RIP [] page_remove_rmap+0x37/0x6d0 [ 57.012805] RSP [ 57.016406] CR2: ffffeafff9138020 [ 57.019839] ---[ end trace ec634c332a7ae33d ]--- [ 57.024569] Kernel panic - not syncing: Fatal exception [ 57.030193] Dumping ftrace buffer: [ 57.033716] (ftrace buffer empty) [ 57.037408] Kernel Offset: disabled [ 57.041015] Rebooting in 86400 seconds..