[....] 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[ 15.408440] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.954259] random: sshd: uninitialized urandom read (32 bytes read) [ 22.296786] random: sshd: uninitialized urandom read (32 bytes read) [ 22.778236] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 28.506046] urandom_read: 1 callbacks suppressed [ 28.506050] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.599270] BUG: unable to handle kernel paging request at ffffeafff8e58020 [ 28.606662] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.613146] PGD 0 [ 28.615138] [ 28.616804] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.621283] Dumping ftrace buffer: [ 28.624807] (ftrace buffer empty) [ 28.628513] Modules linked in: [ 28.631950] CPU: 0 PID: 3749 Comm: syz-executor005 Not tainted 4.9.122-g54068d6 #78 [ 28.639727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.649144] task: ffff8801bdc79800 task.stack: ffff8801bce58000 [ 28.655216] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.663918] RSP: 0018:ffff8801bce5f948 EFLAGS: 00010246 [ 28.669351] RAX: dffffc0000000000 RBX: ffffeafff8e58000 RCX: 0000000000000000 [ 28.676608] RDX: 1ffffd5fff1cb004 RSI: ffffffff814f5918 RDI: ffffeafff8e58000 [ 28.683997] RBP: ffff8801bce5f970 R08: 0000000000033fc0 R09: 0000000000000001 [ 28.691336] R10: ffff8801bdc79800 R11: 0000000000000001 R12: ffff8801bce5fc08 [ 28.698599] R13: ffffeafff8e58020 R14: ffffeafff8e58000 R15: 0000000000000001 [ 28.705858] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.714156] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.720044] CR2: ffffeafff8e58020 CR3: 00000001c435f000 CR4: 00000000001606f0 [ 28.727305] Stack: [ 28.729438] ffffeafff8e58020 ffff8801bce5fc08 ffff8801c434d800 ffffeafff8e58000 [ 28.737512] ffff8801be395318 ffff8801bce5f9c8 ffffffff8154cb8f ffff8801bce5fc18 [ 28.745571] ffff8801bce5fc10 ffff8801bce5fc88 00003ffe396001e0 00000001c434d000 [ 28.753612] Call Trace: [ 28.756208] [] zap_huge_pmd+0x16f/0x860 [ 28.761818] [] unmap_page_range+0x12ad/0x1730 [ 28.767948] [] ? vm_normal_page_pmd+0x310/0x310 [ 28.774370] [] unmap_single_vma+0x101/0x260 [ 28.780339] [] unmap_vmas+0x102/0x1d0 [ 28.785897] [] exit_mmap+0x214/0x3f0 [ 28.791261] [] ? SyS_munmap+0xa0/0xa0 [ 28.796898] [] ? up_write+0x1a/0x60 [ 28.802260] [] mmput+0xf3/0x2d0 [ 28.807204] [] do_exit+0x906/0x27b0 [ 28.812470] [] ? release_task.part.19+0x1210/0x1210 [ 28.819128] [] ? up_write+0x1a/0x60 [ 28.824392] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.830711] [] ? mprotect_fixup+0x930/0x930 [ 28.836673] [] do_group_exit+0x111/0x340 [ 28.842629] [] ? do_group_exit+0x340/0x340 [ 28.848664] [] SyS_exit_group+0x1d/0x20 [ 28.854405] [] do_syscall_64+0x1a6/0x490 [ 28.860111] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.867137] 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 [ 28.895904] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.902271] RSP [ 28.905986] CR2: ffffeafff8e58020 [ 28.909433] ---[ end trace 2602a1852c3d1a93 ]--- [ 28.914202] Kernel panic - not syncing: Fatal exception [ 28.920485] Dumping ftrace buffer: [ 28.924024] (ftrace buffer empty) [ 28.927850] Kernel Offset: disabled [ 28.931618] Rebooting in 86400 seconds..