[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.194779] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.409175] random: sshd: uninitialized urandom read (32 bytes read) [ 23.085833] random: sshd: uninitialized urandom read (32 bytes read) [ 23.679841] random: sshd: uninitialized urandom read (32 bytes read) [ 23.824926] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 29.324749] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.421263] BUG: unable to handle kernel paging request at ffffeafff9138020 [ 29.428635] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.434952] PGD 0 [ 29.436898] [ 29.438521] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.442988] Dumping ftrace buffer: [ 29.446511] (ftrace buffer empty) [ 29.450194] Modules linked in: [ 29.453496] CPU: 1 PID: 3808 Comm: syz-executor650 Not tainted 4.9.120-gf85543b #76 [ 29.461266] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.470731] task: ffff8801b8143000 task.stack: ffff8801bb428000 [ 29.477031] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.485711] RSP: 0018:ffff8801bb42f948 EFLAGS: 00010246 [ 29.491188] RAX: dffffc0000000000 RBX: ffffeafff9138000 RCX: ffffea0006ec0000 [ 29.498440] RDX: 1ffffd5fff227004 RSI: ffffffff814f5128 RDI: ffffeafff9138000 [ 29.505684] RBP: ffff8801bb42f970 R08: ffff8801b81438e8 R09: 0000000000000001 [ 29.512927] R10: ffff8801b8143000 R11: 0000000000000001 R12: ffff8801bb42fc08 [ 29.520172] R13: ffffeafff9138020 R14: ffffeafff9138000 R15: 0000000000000001 [ 29.527422] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.535624] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.541479] CR2: ffffeafff9138020 CR3: 000000000461e000 CR4: 00000000001606f0 [ 29.548727] Stack: [ 29.550853] ffffeafff9138020 ffff8801bb42fc08 ffff8801c78f1838 ffffeafff9138000 [ 29.558988] ffff8801c9b6be70 ffff8801bb42f9c8 ffffffff8154bfcf ffff8801bb42fc18 [ 29.566973] ffff8801bb42fc10 ffff8801bb42fc88 00003ffe44e001a0 00000001c78f1000 [ 29.574959] Call Trace: [ 29.577527] [] zap_huge_pmd+0x16f/0x860 [ 29.583129] [] unmap_page_range+0x12ad/0x1730 [ 29.589277] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.595581] [] unmap_single_vma+0x101/0x260 [ 29.601536] [] unmap_vmas+0x102/0x1d0 [ 29.606965] [] exit_mmap+0x214/0x3f0 [ 29.612305] [] ? SyS_munmap+0xa0/0xa0 [ 29.617795] [] ? up_write+0x1a/0x60 [ 29.623053] [] mmput+0xf3/0x2d0 [ 29.627962] [] do_exit+0x906/0x27b0 [ 29.633215] [] ? release_task.part.19+0x1210/0x1210 [ 29.639862] [] ? up_write+0x1a/0x60 [ 29.645127] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.651290] [] ? mprotect_fixup+0x930/0x930 [ 29.657252] [] do_group_exit+0x111/0x340 [ 29.662938] [] ? do_group_exit+0x340/0x340 [ 29.668798] [] SyS_exit_group+0x1d/0x20 [ 29.674401] [] do_syscall_64+0x1a6/0x490 [ 29.680095] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.686993] 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 [ 29.713989] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.720329] RSP [ 29.723931] CR2: ffffeafff9138020 [ 29.727359] ---[ end trace 8064d59123651fa1 ]--- [ 29.732085] Kernel panic - not syncing: Fatal exception [ 29.737747] Dumping ftrace buffer: [ 29.741265] (ftrace buffer empty) [ 29.744947] Kernel Offset: disabled [ 29.748547] Rebooting in 86400 seconds..