[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.497260] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.743581] random: sshd: uninitialized urandom read (32 bytes read) [ 21.111118] random: sshd: uninitialized urandom read (32 bytes read) [ 21.616821] random: sshd: uninitialized urandom read (32 bytes read) [ 28.138382] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 33.755844] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.836009] BUG: unable to handle kernel paging request at ffffeafff9118020 [ 33.843483] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.849742] PGD 0 [ 33.851690] [ 33.853317] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.857795] Dumping ftrace buffer: [ 33.861311] (ftrace buffer empty) [ 33.864999] Modules linked in: [ 33.868291] CPU: 1 PID: 3799 Comm: syz-executor140 Not tainted 4.9.122-g54068d6 #78 [ 33.876061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.885401] task: ffff8801b8d8c800 task.stack: ffff8801da378000 [ 33.891433] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.900116] RSP: 0018:ffff8801da37f948 EFLAGS: 00010246 [ 33.905539] RAX: dffffc0000000000 RBX: ffffeafff9118000 RCX: 0000000000000000 [ 33.912787] RDX: 1ffffd5fff223004 RSI: ffffffff814f5918 RDI: ffffeafff9118000 [ 33.920040] RBP: ffff8801da37f970 R08: 0000000000034300 R09: 0000000000000001 [ 33.927291] R10: ffff8801b8d8c800 R11: 0000000000000001 R12: ffff8801da37fc08 [ 33.934551] R13: ffffeafff9118020 R14: ffffeafff9118000 R15: 0000000000000001 [ 33.941927] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.950240] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.956110] CR2: ffffeafff9118020 CR3: 00000001c8c6a000 CR4: 00000000001606f0 [ 33.963367] Stack: [ 33.965499] ffffeafff9118020 ffff8801da37fc08 ffff8801ca802800 ffffeafff9118000 [ 33.973598] ffff8801c8e940b0 ffff8801da37f9c8 ffffffff8154cb8f ffff8801da37fc18 [ 33.981667] ffff8801da37fc10 ffff8801da37fc88 00003ffe446001e0 00000001ca802000 [ 33.989778] Call Trace: [ 33.992344] [] zap_huge_pmd+0x16f/0x860 [ 33.997949] [] unmap_page_range+0x12ad/0x1730 [ 34.004095] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.010400] [] unmap_single_vma+0x101/0x260 [ 34.016361] [] unmap_vmas+0x102/0x1d0 [ 34.021886] [] exit_mmap+0x214/0x3f0 [ 34.027231] [] ? SyS_munmap+0xa0/0xa0 [ 34.032664] [] ? up_write+0x1a/0x60 [ 34.037933] [] mmput+0xf3/0x2d0 [ 34.042841] [] do_exit+0x906/0x27b0 [ 34.048102] [] ? release_task.part.19+0x1210/0x1210 [ 34.054855] [] ? up_write+0x1a/0x60 [ 34.060122] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.066258] [] ? mprotect_fixup+0x930/0x930 [ 34.072321] [] do_group_exit+0x111/0x340 [ 34.078016] [] ? do_group_exit+0x340/0x340 [ 34.083898] [] SyS_exit_group+0x1d/0x20 [ 34.089529] [] do_syscall_64+0x1a6/0x490 [ 34.095230] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.102208] 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 [ 34.129267] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.135677] RSP [ 34.139284] CR2: ffffeafff9118020 [ 34.142715] ---[ end trace 88d0384f7d8a7329 ]--- [ 34.147447] Kernel panic - not syncing: Fatal exception [ 34.153133] Dumping ftrace buffer: [ 34.156667] (ftrace buffer empty) [ 34.160412] Kernel Offset: disabled [ 34.164141] Rebooting in 86400 seconds..