[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.052510] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.825166] random: sshd: uninitialized urandom read (32 bytes read) [ 18.284672] random: sshd: uninitialized urandom read (32 bytes read) [ 18.759122] random: sshd: uninitialized urandom read (32 bytes read) [ 24.382756] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 29.901518] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.990387] BUG: unable to handle kernel paging request at ffffeafff8e28020 [ 29.997829] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.004086] PGD 0 [ 30.006037] [ 30.007662] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.012178] Dumping ftrace buffer: [ 30.015698] (ftrace buffer empty) [ 30.019383] Modules linked in: [ 30.022685] CPU: 1 PID: 3801 Comm: syz-executor042 Not tainted 4.9.121-g681e57b #25 [ 30.030538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.039977] task: ffff8801b77b4800 task.stack: ffff8801d9458000 [ 30.046057] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.054742] RSP: 0018:ffff8801d945f948 EFLAGS: 00010246 [ 30.060166] RAX: dffffc0000000000 RBX: ffffeafff8e28000 RCX: 0000000000000000 [ 30.067414] RDX: 1ffffd5fff1c5004 RSI: ffffffff814f5278 RDI: ffffeafff8e28000 [ 30.074663] RBP: ffff8801d945f970 R08: 0000000000033dc0 R09: 0000000000000001 [ 30.081909] R10: ffff8801b77b4800 R11: 0000000000000001 R12: ffff8801d945fc08 [ 30.089157] R13: ffffeafff8e28020 R14: ffffeafff8e28000 R15: 0000000000000001 [ 30.096410] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.104614] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.110472] CR2: ffffeafff8e28020 CR3: 00000001c0418000 CR4: 00000000001606f0 [ 30.117717] Stack: [ 30.119841] ffffeafff8e28020 ffff8801d945fc08 ffff8801c276d800 ffffeafff8e28000 [ 30.127829] ffff8801ca189160 ffff8801d945f9c8 ffffffff8154c20f ffff8801d945fc18 [ 30.135813] ffff8801d945fc10 ffff8801d945fc88 00003ffe38a001e0 00000001c276d000 [ 30.143814] Call Trace: [ 30.146450] [] zap_huge_pmd+0x16f/0x860 [ 30.152061] [] unmap_page_range+0x12ad/0x1730 [ 30.158187] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 30.164485] [] unmap_single_vma+0x101/0x260 [ 30.170436] [] unmap_vmas+0x102/0x1d0 [ 30.175865] [] exit_mmap+0x214/0x3f0 [ 30.181205] [] ? SyS_munmap+0xa0/0xa0 [ 30.186631] [] ? up_write+0x1a/0x60 [ 30.191887] [] mmput+0xf3/0x2d0 [ 30.196840] [] do_exit+0x906/0x27b0 [ 30.202174] [] ? release_task.part.19+0x1210/0x1210 [ 30.208824] [] ? up_write+0x1a/0x60 [ 30.214080] [] ? do_mprotect_pkey+0x71d/0x890 [ 30.220203] [] ? mprotect_fixup+0x930/0x930 [ 30.226153] [] do_group_exit+0x111/0x340 [ 30.231843] [] ? do_group_exit+0x340/0x340 [ 30.237706] [] SyS_exit_group+0x1d/0x20 [ 30.243305] [] do_syscall_64+0x1a6/0x490 [ 30.248992] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.255889] 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 [ 30.283011] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.289340] RSP [ 30.292939] CR2: ffffeafff8e28020 [ 30.296373] ---[ end trace 8115b4aac466e618 ]--- [ 30.301108] Kernel panic - not syncing: Fatal exception [ 30.306743] Dumping ftrace buffer: [ 30.310265] (ftrace buffer empty) [ 30.313948] Kernel Offset: disabled [ 30.317557] Rebooting in 86400 seconds..