[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.735599] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.363394] random: sshd: uninitialized urandom read (32 bytes read) [ 30.817635] random: sshd: uninitialized urandom read (32 bytes read) [ 31.312071] random: sshd: uninitialized urandom read (32 bytes read) [ 31.445999] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 36.927518] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.004321] BUG: unable to handle kernel paging request at ffffeafff9110020 [ 37.011810] IP: [] page_remove_rmap+0x37/0x6d0 [ 37.018081] PGD 0 [ 37.020027] [ 37.021650] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.026125] Dumping ftrace buffer: [ 37.029641] (ftrace buffer empty) [ 37.033490] Modules linked in: [ 37.036796] CPU: 1 PID: 3806 Comm: syz-executor872 Not tainted 4.9.122-g54068d6 #26 [ 37.044666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.053998] task: ffff8801c2c20000 task.stack: ffff8801d9828000 [ 37.060030] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 37.068711] RSP: 0018:ffff8801d982f948 EFLAGS: 00010246 [ 37.074135] RAX: dffffc0000000000 RBX: ffffeafff9110000 RCX: 0000000000000000 [ 37.081387] RDX: 1ffffd5fff222004 RSI: ffffffff814f5918 RDI: ffffeafff9110000 [ 37.088679] RBP: ffff8801d982f970 R08: 0000000000033b60 R09: 0000000000000001 [ 37.095933] R10: ffff8801c2c20000 R11: 0000000000000001 R12: ffff8801d982fc08 [ 37.103178] R13: ffffeafff9110020 R14: ffffeafff9110000 R15: 0000000000000001 [ 37.110427] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.118639] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.124511] CR2: ffffeafff9110020 CR3: 00000001b7bba000 CR4: 00000000001606f0 [ 37.131762] Stack: [ 37.133888] ffffeafff9110020 ffff8801d982fc08 ffff8801b8567800 ffffeafff9110000 [ 37.141873] ffff8801b95c4aa8 ffff8801d982f9c8 ffffffff8154cb8f ffff8801d982fc18 [ 37.149998] ffff8801d982fc10 ffff8801d982fc88 00003ffe444001e0 00000001b8567000 [ 37.158022] Call Trace: [ 37.160591] [] zap_huge_pmd+0x16f/0x860 [ 37.166214] [] unmap_page_range+0x12ad/0x1730 [ 37.172332] [] ? vm_normal_page_pmd+0x310/0x310 [ 37.178702] [] unmap_single_vma+0x101/0x260 [ 37.184699] [] unmap_vmas+0x102/0x1d0 [ 37.190138] [] exit_mmap+0x214/0x3f0 [ 37.195522] [] ? SyS_munmap+0xa0/0xa0 [ 37.200955] [] ? up_write+0x1a/0x60 [ 37.206220] [] mmput+0xf3/0x2d0 [ 37.211348] [] do_exit+0x906/0x27b0 [ 37.216602] [] ? release_task.part.19+0x1210/0x1210 [ 37.223298] [] ? up_write+0x1a/0x60 [ 37.228558] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.234719] [] ? mprotect_fixup+0x930/0x930 [ 37.240670] [] do_group_exit+0x111/0x340 [ 37.246358] [] ? do_group_exit+0x340/0x340 [ 37.252221] [] SyS_exit_group+0x1d/0x20 [ 37.257839] [] do_syscall_64+0x1a6/0x490 [ 37.263634] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.270535] 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 [ 37.297862] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.304270] RSP [ 37.307876] CR2: ffffeafff9110020 [ 37.311310] ---[ end trace c5072af415292080 ]--- [ 37.316041] Kernel panic - not syncing: Fatal exception [ 37.321740] Dumping ftrace buffer: [ 37.325266] (ftrace buffer empty) [ 37.328954] Kernel Offset: disabled [ 37.332603] Rebooting in 86400 seconds..