[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.708565] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.257299] random: sshd: uninitialized urandom read (32 bytes read) [ 18.661636] random: sshd: uninitialized urandom read (32 bytes read) [ 19.228386] random: sshd: uninitialized urandom read (32 bytes read) [ 31.465659] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 36.934352] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.016991] BUG: unable to handle kernel paging request at ffffeafff9070020 [ 37.024488] IP: [] page_remove_rmap+0x37/0x6d0 [ 37.030732] PGD 0 [ 37.032678] [ 37.034295] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.038764] Dumping ftrace buffer: [ 37.042279] (ftrace buffer empty) [ 37.045962] Modules linked in: [ 37.049245] CPU: 0 PID: 3794 Comm: syz-executor231 Not tainted 4.9.120-gf85543b #76 [ 37.057011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.066349] task: ffff8801b9cac800 task.stack: ffff8801b9b30000 [ 37.072377] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 37.081053] RSP: 0018:ffff8801b9b37948 EFLAGS: 00010246 [ 37.086488] RAX: dffffc0000000000 RBX: ffffeafff9070000 RCX: 0000000000000000 [ 37.093732] RDX: 1ffffd5fff20e004 RSI: ffffffff814f5128 RDI: ffffeafff9070000 [ 37.100976] RBP: ffff8801b9b37970 R08: 0000000000033f60 R09: 0000000000000001 [ 37.108234] R10: ffff8801b9cac800 R11: 0000000000000001 R12: ffff8801b9b37c08 [ 37.115481] R13: ffffeafff9070020 R14: ffffeafff9070000 R15: 0000000000000001 [ 37.122727] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.130925] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.136780] CR2: ffffeafff9070020 CR3: 00000001c9595000 CR4: 00000000001606f0 [ 37.144024] Stack: [ 37.146149] ffffeafff9070020 ffff8801b9b37c08 ffff8801c96a7800 ffffeafff9070000 [ 37.154139] ffff8801bf1800b0 ffff8801b9b379c8 ffffffff8154bfcf ffff8801b9b37c18 [ 37.162132] ffff8801b9b37c10 ffff8801b9b37c88 00003ffe41c001e0 00000001c96a7000 [ 37.170120] Call Trace: [ 37.172683] [] zap_huge_pmd+0x16f/0x860 [ 37.178283] [] unmap_page_range+0x12ad/0x1730 [ 37.184401] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 37.190696] [] unmap_single_vma+0x101/0x260 [ 37.196702] [] unmap_vmas+0x102/0x1d0 [ 37.202135] [] exit_mmap+0x214/0x3f0 [ 37.207480] [] ? SyS_munmap+0xa0/0xa0 [ 37.212909] [] ? up_write+0x1a/0x60 [ 37.218161] [] mmput+0xf3/0x2d0 [ 37.223071] [] do_exit+0x906/0x27b0 [ 37.228321] [] ? release_task.part.19+0x1210/0x1210 [ 37.234966] [] ? up_write+0x1a/0x60 [ 37.240223] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.246344] [] ? mprotect_fixup+0x930/0x930 [ 37.252293] [] do_group_exit+0x111/0x340 [ 37.257991] [] ? do_group_exit+0x340/0x340 [ 37.263853] [] SyS_exit_group+0x1d/0x20 [ 37.269453] [] do_syscall_64+0x1a6/0x490 [ 37.275158] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.282181] 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 [ 37.309084] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.315412] RSP [ 37.319011] CR2: ffffeafff9070020 [ 37.322444] ---[ end trace dd65321cc9d51783 ]--- [ 37.327171] Kernel panic - not syncing: Fatal exception [ 37.332795] Dumping ftrace buffer: [ 37.336358] (ftrace buffer empty) [ 37.340093] Kernel Offset: disabled [ 37.343701] Rebooting in 86400 seconds..