[....] 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[ 12.056069] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.244031] random: sshd: uninitialized urandom read (32 bytes read) [ 18.575450] random: sshd: uninitialized urandom read (32 bytes read) [ 19.071321] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. [ 24.842975] urandom_read: 1 callbacks suppressed [ 24.842979] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.926834] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 24.934258] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.940509] PGD 0 [ 24.942454] [ 24.944075] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.948545] Dumping ftrace buffer: [ 24.952057] (ftrace buffer empty) [ 24.955742] Modules linked in: [ 24.959029] CPU: 0 PID: 3787 Comm: syz-executor441 Not tainted 4.9.122-g54068d6 #78 [ 24.966795] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.976128] task: ffff8801b9c73000 task.stack: ffff8801b85a0000 [ 24.982163] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.990839] RSP: 0018:ffff8801b85a7948 EFLAGS: 00010246 [ 24.996273] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 25.003518] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 25.010761] RBP: ffff8801b85a7970 R08: 0000000000033a00 R09: 0000000000000001 [ 25.018019] R10: ffff8801b9c73000 R11: 0000000000000001 R12: ffff8801b85a7c08 [ 25.025262] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 25.032510] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.040711] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.046568] CR2: ffffeafff90e8020 CR3: 00000001c9fa9000 CR4: 00000000001606f0 [ 25.053814] Stack: [ 25.055937] ffffeafff90e8020 ffff8801b85a7c08 ffff8801c9f7a800 ffffeafff90e8000 [ 25.063922] ffff8801ba6c86e0 ffff8801b85a79c8 ffffffff8154cb8f ffff8801b85a7c18 [ 25.071923] ffff8801b85a7c10 ffff8801b85a7c88 00003ffe43a001e0 00000001c9f7a000 [ 25.080043] Call Trace: [ 25.082606] [] zap_huge_pmd+0x16f/0x860 [ 25.088210] [] unmap_page_range+0x12ad/0x1730 [ 25.094332] [] ? vm_normal_page_pmd+0x310/0x310 [ 25.100625] [] unmap_single_vma+0x101/0x260 [ 25.106573] [] unmap_vmas+0x102/0x1d0 [ 25.111999] [] exit_mmap+0x214/0x3f0 [ 25.117335] [] ? SyS_munmap+0xa0/0xa0 [ 25.122759] [] ? up_write+0x1a/0x60 [ 25.128074] [] mmput+0xf3/0x2d0 [ 25.132989] [] do_exit+0x906/0x27b0 [ 25.138240] [] ? release_task.part.19+0x1210/0x1210 [ 25.144882] [] ? up_write+0x1a/0x60 [ 25.150134] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.156256] [] ? mprotect_fixup+0x930/0x930 [ 25.162201] [] do_group_exit+0x111/0x340 [ 25.167915] [] ? do_group_exit+0x340/0x340 [ 25.173877] [] SyS_exit_group+0x1d/0x20 [ 25.179485] [] do_syscall_64+0x1a6/0x490 [ 25.185175] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.192072] 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 [ 25.219110] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.225450] RSP [ 25.229047] CR2: ffffeafff90e8020 [ 25.232474] ---[ end trace 8227cc200e9e8173 ]--- [ 25.237201] Kernel panic - not syncing: Fatal exception [ 25.242837] Dumping ftrace buffer: [ 25.246360] (ftrace buffer empty) [ 25.250044] Kernel Offset: disabled [ 25.253644] Rebooting in 86400 seconds..