[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.299173] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.157610] random: sshd: uninitialized urandom read (32 bytes read) [ 19.515298] random: sshd: uninitialized urandom read (32 bytes read) [ 20.012646] random: sshd: uninitialized urandom read (32 bytes read) [ 51.672771] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 57.365476] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 57.446690] BUG: unable to handle kernel paging request at ffffeafff9088020 [ 57.454157] IP: [] page_remove_rmap+0x37/0x6d0 [ 57.460424] PGD 0 [ 57.462374] [ 57.463999] Oops: 0000 [#1] PREEMPT SMP KASAN [ 57.468560] Dumping ftrace buffer: [ 57.472081] (ftrace buffer empty) [ 57.475814] Modules linked in: [ 57.479110] CPU: 0 PID: 3816 Comm: syz-executor209 Not tainted 4.9.121-g681e57b #77 [ 57.486882] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.496344] task: ffff8801d8ceb000 task.stack: ffff8801da378000 [ 57.502424] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 57.511109] RSP: 0018:ffff8801da37f948 EFLAGS: 00010246 [ 57.516764] RAX: dffffc0000000000 RBX: ffffeafff9088000 RCX: 0000000000000000 [ 57.524085] RDX: 1ffffd5fff211004 RSI: ffffffff814f5278 RDI: ffffeafff9088000 [ 57.531373] RBP: ffff8801da37f970 R08: 0000000000035000 R09: 0000000000000001 [ 57.538638] R10: ffff8801d8ceb000 R11: 0000000000000001 R12: ffff8801da37fc08 [ 57.545883] R13: ffffeafff9088020 R14: ffffeafff9088000 R15: 0000000000000001 [ 57.553131] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 57.561333] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.567192] CR2: ffffeafff9088020 CR3: 00000001c06cc000 CR4: 00000000001606f0 [ 57.574438] Stack: [ 57.576565] ffffeafff9088020 ffff8801da37fc08 ffff8801c1986800 ffffeafff9088000 [ 57.584561] ffff8801b8a1e738 ffff8801da37f9c8 ffffffff8154c20f ffff8801da37fc18 [ 57.592578] ffff8801da37fc10 ffff8801da37fc88 00003ffe422001e0 00000001c1986000 [ 57.600569] Call Trace: [ 57.603139] [] zap_huge_pmd+0x16f/0x860 [ 57.608742] [] unmap_page_range+0x12ad/0x1730 [ 57.614879] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 57.621178] [] unmap_single_vma+0x101/0x260 [ 57.627132] [] unmap_vmas+0x102/0x1d0 [ 57.632558] [] exit_mmap+0x214/0x3f0 [ 57.637898] [] ? SyS_munmap+0xa0/0xa0 [ 57.643371] [] ? up_write+0x1a/0x60 [ 57.648632] [] mmput+0xf3/0x2d0 [ 57.653552] [] do_exit+0x906/0x27b0 [ 57.659156] [] ? release_task.part.19+0x1210/0x1210 [ 57.666056] [] ? up_write+0x1a/0x60 [ 57.671320] [] ? do_mprotect_pkey+0x71d/0x890 [ 57.677443] [] ? mprotect_fixup+0x930/0x930 [ 57.683393] [] do_group_exit+0x111/0x340 [ 57.689131] [] ? do_group_exit+0x340/0x340 [ 57.695182] [] SyS_exit_group+0x1d/0x20 [ 57.700999] [] do_syscall_64+0x1a6/0x490 [ 57.706703] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 57.713655] 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 [ 57.740634] RIP [] page_remove_rmap+0x37/0x6d0 [ 57.746962] RSP [ 57.750563] CR2: ffffeafff9088020 [ 57.754001] ---[ end trace b50576fec9b48dd2 ]--- [ 57.758847] Kernel panic - not syncing: Fatal exception [ 57.764513] Dumping ftrace buffer: [ 57.768043] (ftrace buffer empty) [ 57.771728] Kernel Offset: disabled [ 57.775334] Rebooting in 86400 seconds..