[....] 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[ 13.485307] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.093985] random: sshd: uninitialized urandom read (32 bytes read) [ 27.339432] random: sshd: uninitialized urandom read (32 bytes read) [ 27.862424] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 33.642070] urandom_read: 1 callbacks suppressed [ 33.642074] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.751778] BUG: unable to handle kernel paging request at ffffeafff8d80020 [ 33.759238] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.765505] PGD 0 [ 33.767451] [ 33.769075] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.773675] Dumping ftrace buffer: [ 33.777190] (ftrace buffer empty) [ 33.780873] Modules linked in: [ 33.784161] CPU: 0 PID: 3810 Comm: syz-executor169 Not tainted 4.9.121-g681e57b #25 [ 33.791931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.801266] task: ffff8801b979e000 task.stack: ffff8801b5c30000 [ 33.807298] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.815974] RSP: 0018:ffff8801b5c37948 EFLAGS: 00010246 [ 33.821393] RAX: dffffc0000000000 RBX: ffffeafff8d80000 RCX: 0000000000000000 [ 33.828639] RDX: 1ffffd5fff1b0004 RSI: ffffffff814f5278 RDI: ffffeafff8d80000 [ 33.835881] RBP: ffff8801b5c37970 R08: 0000000000033b00 R09: 0000000000000001 [ 33.843125] R10: ffff8801b979e000 R11: 0000000000000001 R12: ffff8801b5c37c08 [ 33.850476] R13: ffffeafff8d80020 R14: ffffeafff8d80000 R15: 0000000000000001 [ 33.857739] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.865943] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.871797] CR2: ffffeafff8d80020 CR3: 00000001be71f000 CR4: 00000000001606f0 [ 33.879088] Stack: [ 33.881219] ffffeafff8d80020 ffff8801b5c37c08 ffff8801b76fd800 ffffeafff8d80000 [ 33.889208] ffff8801b9708f20 ffff8801b5c379c8 ffffffff8154c20f ffff8801b5c37c18 [ 33.897347] ffff8801b5c37c10 ffff8801b5c37c88 00003ffe360001e0 00000001b76fd000 [ 33.905331] Call Trace: [ 33.907896] [] zap_huge_pmd+0x16f/0x860 [ 33.913496] [] unmap_page_range+0x12ad/0x1730 [ 33.919621] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.925919] [] unmap_single_vma+0x101/0x260 [ 33.931867] [] unmap_vmas+0x102/0x1d0 [ 33.937292] [] exit_mmap+0x214/0x3f0 [ 33.942628] [] ? SyS_munmap+0xa0/0xa0 [ 33.948054] [] ? up_write+0x1a/0x60 [ 33.953307] [] mmput+0xf3/0x2d0 [ 33.958217] [] do_exit+0x906/0x27b0 [ 33.963475] [] ? release_task.part.19+0x1210/0x1210 [ 33.970121] [] ? up_write+0x1a/0x60 [ 33.975373] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.981492] [] ? mprotect_fixup+0x930/0x930 [ 33.987448] [] do_group_exit+0x111/0x340 [ 33.993137] [] ? do_group_exit+0x340/0x340 [ 33.999001] [] SyS_exit_group+0x1d/0x20 [ 34.004605] [] do_syscall_64+0x1a6/0x490 [ 34.010290] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.017184] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 34.044066] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.050396] RSP [ 34.053991] CR2: ffffeafff8d80020 [ 34.057419] ---[ end trace 58f52868580befbc ]--- [ 34.062147] Kernel panic - not syncing: Fatal exception [ 34.067824] Dumping ftrace buffer: [ 34.071346] (ftrace buffer empty) [ 34.075029] Kernel Offset: disabled [ 34.078629] Rebooting in 86400 seconds..