[....] 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[ 13.418703] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.137505] random: sshd: uninitialized urandom read (32 bytes read) [ 28.614145] random: sshd: uninitialized urandom read (32 bytes read) [ 29.017023] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 34.722903] urandom_read: 1 callbacks suppressed [ 34.722907] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.819089] BUG: unable to handle kernel paging request at ffffeafff9020020 [ 34.826441] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.832688] PGD 0 [ 34.834635] [ 34.836254] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.840724] Dumping ftrace buffer: [ 34.844239] (ftrace buffer empty) [ 34.847922] Modules linked in: [ 34.851205] CPU: 1 PID: 3810 Comm: syz-executor141 Not tainted 4.9.122-g54068d6 #26 [ 34.858968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.868400] task: ffff8801b7aa8000 task.stack: ffff8801b83f0000 [ 34.874432] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.883112] RSP: 0018:ffff8801b83f7948 EFLAGS: 00010246 [ 34.888531] RAX: dffffc0000000000 RBX: ffffeafff9020000 RCX: 0000000000000000 [ 34.895777] RDX: 1ffffd5fff204004 RSI: ffffffff814f5918 RDI: ffffeafff9020000 [ 34.903022] RBP: ffff8801b83f7970 R08: 0000000000033c20 R09: 0000000000000001 [ 34.910307] R10: ffff8801b7aa8000 R11: 0000000000000001 R12: ffff8801b83f7c08 [ 34.917557] R13: ffffeafff9020020 R14: ffffeafff9020000 R15: 0000000000000001 [ 34.924804] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.933004] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.938856] CR2: ffffeafff9020020 CR3: 00000001c9424000 CR4: 00000000001606f0 [ 34.946099] Stack: [ 34.948238] ffffeafff9020020 ffff8801b83f7c08 ffff8801cc64a800 ffffeafff9020000 [ 34.956273] ffff8801b765ae70 ffff8801b83f79c8 ffffffff8154cb8f ffff8801b83f7c18 [ 34.964332] ffff8801b83f7c10 ffff8801b83f7c88 00003ffe408001e0 00000001cc64a000 [ 34.972354] Call Trace: [ 34.974996] [] zap_huge_pmd+0x16f/0x860 [ 34.980602] [] unmap_page_range+0x12ad/0x1730 [ 34.986723] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.993026] [] unmap_single_vma+0x101/0x260 [ 34.998974] [] unmap_vmas+0x102/0x1d0 [ 35.004401] [] exit_mmap+0x214/0x3f0 [ 35.009736] [] ? SyS_munmap+0xa0/0xa0 [ 35.015209] [] ? up_write+0x1a/0x60 [ 35.020486] [] mmput+0xf3/0x2d0 [ 35.025390] [] do_exit+0x906/0x27b0 [ 35.030642] [] ? release_task.part.19+0x1210/0x1210 [ 35.037281] [] ? up_write+0x1a/0x60 [ 35.042532] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.048651] [] ? mprotect_fixup+0x930/0x930 [ 35.054706] [] do_group_exit+0x111/0x340 [ 35.060427] [] ? do_group_exit+0x340/0x340 [ 35.066300] [] SyS_exit_group+0x1d/0x20 [ 35.071899] [] do_syscall_64+0x1a6/0x490 [ 35.077588] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.084485] 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 [ 35.111442] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.117784] RSP [ 35.121379] CR2: ffffeafff9020020 [ 35.124808] ---[ end trace 47fb4bc1fdbf99e7 ]--- [ 35.129547] Kernel panic - not syncing: Fatal exception [ 35.135181] Dumping ftrace buffer: [ 35.138701] (ftrace buffer empty) [ 35.142385] Kernel Offset: disabled [ 35.146063] Rebooting in 86400 seconds..