[....] 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[ 12.860279] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.282342] random: sshd: uninitialized urandom read (32 bytes read) [ 28.516429] random: sshd: uninitialized urandom read (32 bytes read) [ 29.009009] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. [ 34.618295] urandom_read: 1 callbacks suppressed [ 34.618298] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.704326] BUG: unable to handle kernel paging request at ffffeafff8db0020 [ 34.711797] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.718246] PGD 0 [ 34.720203] [ 34.721978] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.726465] Dumping ftrace buffer: [ 34.729989] (ftrace buffer empty) [ 34.733846] Modules linked in: [ 34.737156] CPU: 1 PID: 3807 Comm: syz-executor365 Not tainted 4.9.122-g54068d6 #78 [ 34.744948] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.754564] task: ffff8801b855c800 task.stack: ffff8801d94a0000 [ 34.760610] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.769601] RSP: 0018:ffff8801d94a7948 EFLAGS: 00010246 [ 34.775147] RAX: dffffc0000000000 RBX: ffffeafff8db0000 RCX: 0000000000000000 [ 34.782401] RDX: 1ffffd5fff1b6004 RSI: ffffffff814f5918 RDI: ffffeafff8db0000 [ 34.789859] RBP: ffff8801d94a7970 R08: 00000000000345e0 R09: 0000000000000001 [ 34.797258] R10: ffff8801b855c800 R11: 0000000000000001 R12: ffff8801d94a7c08 [ 34.804518] R13: ffffeafff8db0020 R14: ffffeafff8db0000 R15: 0000000000000001 [ 34.811772] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.819980] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.825950] CR2: ffffeafff8db0020 CR3: 00000001c8f2b000 CR4: 00000000001606f0 [ 34.833215] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.840468] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.847722] Stack: [ 34.849857] ffffeafff8db0020 ffff8801d94a7c08 ffff8801cb06d800 ffffeafff8db0000 [ 34.857892] ffff8801c7ccbb00 ffff8801d94a79c8 ffffffff8154cb8f ffff8801d94a7c18 [ 34.865943] ffff8801d94a7c10 ffff8801d94a7c88 00003ffe36c001e0 00000001cb06d000 [ 34.873979] Call Trace: [ 34.876556] [] zap_huge_pmd+0x16f/0x860 [ 34.882162] [] unmap_page_range+0x12ad/0x1730 [ 34.888290] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.894605] [] unmap_single_vma+0x101/0x260 [ 34.900559] [] unmap_vmas+0x102/0x1d0 [ 34.906440] [] exit_mmap+0x214/0x3f0 [ 34.911979] [] ? SyS_munmap+0xa0/0xa0 [ 34.917522] [] ? up_write+0x1a/0x60 [ 34.922789] [] mmput+0xf3/0x2d0 [ 34.927705] [] do_exit+0x906/0x27b0 [ 34.932967] [] ? release_task.part.19+0x1210/0x1210 [ 34.939748] [] ? up_write+0x1a/0x60 [ 34.945013] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.951148] [] ? mprotect_fixup+0x930/0x930 [ 34.957104] [] do_group_exit+0x111/0x340 [ 34.962887] [] ? do_group_exit+0x340/0x340 [ 34.968761] [] SyS_exit_group+0x1d/0x20 [ 34.974376] [] do_syscall_64+0x1a6/0x490 [ 34.980150] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.987062] 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 [ 35.015456] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.021966] RSP [ 35.025576] CR2: ffffeafff8db0020 [ 35.029019] ---[ end trace 262c365a61667a50 ]--- [ 35.033761] Kernel panic - not syncing: Fatal exception [ 35.039720] Dumping ftrace buffer: [ 35.043257] (ftrace buffer empty) [ 35.047039] Kernel Offset: disabled [ 35.050773] Rebooting in 86400 seconds..