[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.072867] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.352695] random: sshd: uninitialized urandom read (32 bytes read) [ 27.775317] random: sshd: uninitialized urandom read (32 bytes read) [ 28.259026] random: sshd: uninitialized urandom read (32 bytes read) [ 28.397417] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 33.903394] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.979773] BUG: unable to handle kernel paging request at ffffeafff90b0020 [ 33.987134] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.993458] PGD 0 [ 33.995410] [ 33.997031] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.001496] Dumping ftrace buffer: [ 34.005006] (ftrace buffer empty) [ 34.008686] Modules linked in: [ 34.011973] CPU: 0 PID: 3788 Comm: syz-executor422 Not tainted 4.9.122-g54068d6 #26 [ 34.019779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.029112] task: ffff8801ba56b000 task.stack: ffff8801b86c8000 [ 34.035142] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.043813] RSP: 0018:ffff8801b86cf948 EFLAGS: 00010246 [ 34.049235] RAX: dffffc0000000000 RBX: ffffeafff90b0000 RCX: 0000000000000000 [ 34.056475] RDX: 1ffffd5fff216004 RSI: ffffffff814f5918 RDI: ffffeafff90b0000 [ 34.063716] RBP: ffff8801b86cf970 R08: 0000000000034040 R09: 0000000000000001 [ 34.071065] R10: ffff8801ba56b000 R11: 0000000000000001 R12: ffff8801b86cfc08 [ 34.078314] R13: ffffeafff90b0020 R14: ffffeafff90b0000 R15: 0000000000000001 [ 34.086024] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.094226] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.100081] CR2: ffffeafff90b0020 CR3: 00000001bec4d000 CR4: 00000000001606f0 [ 34.107331] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.114579] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.121820] Stack: [ 34.123947] ffffeafff90b0020 ffff8801b86cfc08 ffff8801bfdfe800 ffffeafff90b0000 [ 34.132005] ffff8801b89b0f78 ffff8801b86cf9c8 ffffffff8154cb8f ffff8801b86cfc18 [ 34.139992] ffff8801b86cfc10 ffff8801b86cfc88 00003ffe42c001e0 00000001bfdfe000 [ 34.147970] Call Trace: [ 34.150537] [] zap_huge_pmd+0x16f/0x860 [ 34.156134] [] unmap_page_range+0x12ad/0x1730 [ 34.162253] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.168573] [] unmap_single_vma+0x101/0x260 [ 34.174521] [] unmap_vmas+0x102/0x1d0 [ 34.179979] [] exit_mmap+0x214/0x3f0 [ 34.185322] [] ? SyS_munmap+0xa0/0xa0 [ 34.190764] [] ? up_write+0x1a/0x60 [ 34.196025] [] mmput+0xf3/0x2d0 [ 34.200953] [] do_exit+0x906/0x27b0 [ 34.206315] [] ? release_task.part.19+0x1210/0x1210 [ 34.212960] [] ? up_write+0x1a/0x60 [ 34.218323] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.224443] [] ? mprotect_fixup+0x930/0x930 [ 34.230493] [] do_group_exit+0x111/0x340 [ 34.236180] [] ? do_group_exit+0x340/0x340 [ 34.242052] [] SyS_exit_group+0x1d/0x20 [ 34.247666] [] do_syscall_64+0x1a6/0x490 [ 34.253460] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.260356] 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 [ 34.287257] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.293597] RSP [ 34.297191] CR2: ffffeafff90b0020 [ 34.300619] ---[ end trace 68274ee97ea072a2 ]--- [ 34.305341] Kernel panic - not syncing: Fatal exception [ 34.311073] Dumping ftrace buffer: [ 34.314592] (ftrace buffer empty) [ 34.318273] Kernel Offset: disabled [ 34.321869] Rebooting in 86400 seconds..