[....] 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[ 13.139430] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.217554] random: sshd: uninitialized urandom read (32 bytes read) [ 28.591918] random: sshd: uninitialized urandom read (32 bytes read) [ 29.052468] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 35.290060] urandom_read: 1 callbacks suppressed [ 35.290064] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.376681] BUG: unable to handle kernel paging request at ffffeafff8e10020 [ 35.384077] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.390341] PGD 0 [ 35.392399] [ 35.394027] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.398500] Dumping ftrace buffer: [ 35.402111] (ftrace buffer empty) [ 35.405844] Modules linked in: [ 35.409189] CPU: 1 PID: 3649 Comm: syz-executor904 Not tainted 4.9.122-g54068d6 #78 [ 35.417025] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.426390] task: ffff8801c49f1800 task.stack: ffff8801c4e30000 [ 35.432518] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.442076] RSP: 0018:ffff8801c4e37948 EFLAGS: 00010246 [ 35.447514] RAX: dffffc0000000000 RBX: ffffeafff8e10000 RCX: 0000000000000000 [ 35.454763] RDX: 1ffffd5fff1c2004 RSI: ffffffff814f5918 RDI: ffffeafff8e10000 [ 35.462022] RBP: ffff8801c4e37970 R08: 0000000000034240 R09: 0000000000000001 [ 35.469283] R10: ffff8801c49f1800 R11: 0000000000000001 R12: ffff8801c4e37c08 [ 35.476529] R13: ffffeafff8e10020 R14: ffffeafff8e10000 R15: 0000000000000001 [ 35.483780] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.491986] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.497843] CR2: ffffeafff8e10020 CR3: 00000001c9593000 CR4: 00000000001606f0 [ 35.505174] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.512527] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.519775] Stack: [ 35.521905] ffffeafff8e10020 ffff8801c4e37c08 ffff8801cc4b8800 ffffeafff8e10000 [ 35.529896] ffff8801c485a790 ffff8801c4e379c8 ffffffff8154cb8f ffff8801c4e37c18 [ 35.537920] ffff8801c4e37c10 ffff8801c4e37c88 00003ffe384001e0 00000001cc4b8000 [ 35.545939] Call Trace: [ 35.548523] [] zap_huge_pmd+0x16f/0x860 [ 35.554127] [] unmap_page_range+0x12ad/0x1730 [ 35.560254] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.566551] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 35.573680] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 35.580499] [] unmap_single_vma+0x101/0x260 [ 35.586457] [] unmap_vmas+0x102/0x1d0 [ 35.591892] [] exit_mmap+0x214/0x3f0 [ 35.597347] [] ? SyS_munmap+0xa0/0xa0 [ 35.602869] [] ? up_write+0x1a/0x60 [ 35.608130] [] mmput+0xf3/0x2d0 [ 35.613038] [] do_exit+0x906/0x27b0 [ 35.618297] [] ? release_task.part.19+0x1210/0x1210 [ 35.625007] [] ? up_write+0x1a/0x60 [ 35.630265] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.636388] [] ? mprotect_fixup+0x930/0x930 [ 35.642444] [] do_group_exit+0x111/0x340 [ 35.648219] [] ? do_group_exit+0x340/0x340 [ 35.654088] [] SyS_exit_group+0x1d/0x20 [ 35.659704] [] do_syscall_64+0x1a6/0x490 [ 35.665538] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.672442] 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 [ 35.699521] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.705856] RSP [ 35.709455] CR2: ffffeafff8e10020 [ 35.712889] ---[ end trace 7d1b05a741fd97f8 ]--- [ 35.717621] Kernel panic - not syncing: Fatal exception [ 35.723281] Dumping ftrace buffer: [ 35.726795] (ftrace buffer empty) [ 35.730481] Kernel Offset: disabled [ 35.734083] Rebooting in 86400 seconds..