[....] 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[ 15.460853] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.318217] random: sshd: uninitialized urandom read (32 bytes read) [ 17.515375] random: sshd: uninitialized urandom read (32 bytes read) [ 18.026798] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 23.798486] urandom_read: 1 callbacks suppressed [ 23.798489] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.881793] BUG: unable to handle kernel paging request at ffffeafff8d30020 [ 23.889165] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.895410] PGD 0 [ 23.897354] [ 23.898976] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.903446] Dumping ftrace buffer: [ 23.906955] (ftrace buffer empty) [ 23.910637] Modules linked in: [ 23.913918] CPU: 1 PID: 3781 Comm: syz-executor679 Not tainted 4.9.122-g54068d6 #78 [ 23.921685] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.931034] task: ffff8801b99db000 task.stack: ffff8801bc4e0000 [ 23.937065] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.945743] RSP: 0018:ffff8801bc4e7948 EFLAGS: 00010246 [ 23.951166] RAX: dffffc0000000000 RBX: ffffeafff8d30000 RCX: 0000000000000000 [ 23.958421] RDX: 1ffffd5fff1a6004 RSI: ffffffff814f5918 RDI: ffffeafff8d30000 [ 23.965685] RBP: ffff8801bc4e7970 R08: 0000000000034260 R09: 0000000000000001 [ 23.972932] R10: ffff8801b99db000 R11: 0000000000000001 R12: ffff8801bc4e7c08 [ 23.980188] R13: ffffeafff8d30020 R14: ffffeafff8d30000 R15: 0000000000000001 [ 23.987434] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 23.995633] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.001489] CR2: ffffeafff8d30020 CR3: 00000001b8f77000 CR4: 00000000001606f0 [ 24.008734] Stack: [ 24.010885] ffffeafff8d30020 ffff8801bc4e7c08 ffff8801bb376800 ffffeafff8d30000 [ 24.018891] ffff8801b84cf580 ffff8801bc4e79c8 ffffffff8154cb8f ffff8801bc4e7c18 [ 24.026888] ffff8801bc4e7c10 ffff8801bc4e7c88 00003ffe34c001e0 00000001bb376000 [ 24.034886] Call Trace: [ 24.037467] [] zap_huge_pmd+0x16f/0x860 [ 24.043068] [] unmap_page_range+0x12ad/0x1730 [ 24.049198] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.055497] [] unmap_single_vma+0x101/0x260 [ 24.061446] [] unmap_vmas+0x102/0x1d0 [ 24.066869] [] exit_mmap+0x214/0x3f0 [ 24.072206] [] ? SyS_munmap+0xa0/0xa0 [ 24.077633] [] ? up_write+0x1a/0x60 [ 24.082887] [] mmput+0xf3/0x2d0 [ 24.087789] [] do_exit+0x906/0x27b0 [ 24.093064] [] ? release_task.part.19+0x1210/0x1210 [ 24.099711] [] ? up_write+0x1a/0x60 [ 24.104986] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.111152] [] ? mprotect_fixup+0x930/0x930 [ 24.117104] [] do_group_exit+0x111/0x340 [ 24.122790] [] ? do_group_exit+0x340/0x340 [ 24.128650] [] SyS_exit_group+0x1d/0x20 [ 24.134369] [] do_syscall_64+0x1a6/0x490 [ 24.140070] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.146987] 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 [ 24.173926] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.180287] RSP [ 24.183902] CR2: ffffeafff8d30020 [ 24.187330] ---[ end trace 5ea8170c9b4c91ea ]--- [ 24.192056] Kernel panic - not syncing: Fatal exception [ 24.197737] Dumping ftrace buffer: [ 24.201263] (ftrace buffer empty) [ 24.204949] Kernel Offset: disabled [ 24.208551] Rebooting in 86400 seconds..