[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.451090] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.684063] random: sshd: uninitialized urandom read (32 bytes read) [ 21.932248] random: sshd: uninitialized urandom read (32 bytes read) [ 22.451582] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 28.200470] urandom_read: 1 callbacks suppressed [ 28.200473] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.286874] BUG: unable to handle kernel paging request at ffffeafff91b8020 [ 28.294280] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.300529] PGD 0 [ 28.302472] [ 28.304093] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.308602] Dumping ftrace buffer: [ 28.312133] (ftrace buffer empty) [ 28.315839] Modules linked in: [ 28.319137] CPU: 1 PID: 3804 Comm: syz-executor742 Not tainted 4.9.122-g54068d6 #78 [ 28.326973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.336309] task: ffff8801b7c24800 task.stack: ffff8801c5a40000 [ 28.342335] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.351008] RSP: 0018:ffff8801c5a47948 EFLAGS: 00010246 [ 28.356430] RAX: dffffc0000000000 RBX: ffffeafff91b8000 RCX: 0000000000000000 [ 28.363672] RDX: 1ffffd5fff237004 RSI: ffffffff814f5918 RDI: ffffeafff91b8000 [ 28.370915] RBP: ffff8801c5a47970 R08: 0000000000033da0 R09: 0000000000000001 [ 28.378161] R10: ffff8801b7c24800 R11: 0000000000000001 R12: ffff8801c5a47c08 [ 28.385408] R13: ffffeafff91b8020 R14: ffffeafff91b8000 R15: 0000000000000001 [ 28.392659] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.400859] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.406715] CR2: ffffeafff91b8020 CR3: 00000001c4b3b000 CR4: 00000000001606f0 [ 28.413958] Stack: [ 28.416084] ffffeafff91b8020 ffff8801c5a47c08 ffff8801c9c7a800 ffffeafff91b8000 [ 28.424069] ffff8801c6a611b8 ffff8801c5a479c8 ffffffff8154cb8f ffff8801c5a47c18 [ 28.432058] ffff8801c5a47c10 ffff8801c5a47c88 00003ffe46e001e0 00000001c9c7a000 [ 28.440044] Call Trace: [ 28.442608] [] zap_huge_pmd+0x16f/0x860 [ 28.448207] [] unmap_page_range+0x12ad/0x1730 [ 28.454325] [] ? vm_normal_page_pmd+0x310/0x310 [ 28.460616] [] unmap_single_vma+0x101/0x260 [ 28.466564] [] unmap_vmas+0x102/0x1d0 [ 28.471988] [] exit_mmap+0x214/0x3f0 [ 28.477327] [] ? SyS_munmap+0xa0/0xa0 [ 28.482769] [] ? up_write+0x1a/0x60 [ 28.488019] [] mmput+0xf3/0x2d0 [ 28.492932] [] do_exit+0x906/0x27b0 [ 28.498233] [] ? release_task.part.19+0x1210/0x1210 [ 28.504899] [] ? up_write+0x1a/0x60 [ 28.510152] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.516271] [] ? mprotect_fixup+0x930/0x930 [ 28.522216] [] do_group_exit+0x111/0x340 [ 28.527903] [] ? do_group_exit+0x340/0x340 [ 28.533762] [] SyS_exit_group+0x1d/0x20 [ 28.539364] [] do_syscall_64+0x1a6/0x490 [ 28.545050] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.551982] 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 [ 28.578974] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.585314] RSP [ 28.588910] CR2: ffffeafff91b8020 [ 28.592337] ---[ end trace db9fae95264a6bb8 ]--- [ 28.597063] Kernel panic - not syncing: Fatal exception [ 28.602777] Dumping ftrace buffer: [ 28.606297] (ftrace buffer empty) [ 28.609982] Kernel Offset: disabled [ 28.613580] Rebooting in 86400 seconds..