[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.853609] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.321746] random: sshd: uninitialized urandom read (32 bytes read) [ 18.677170] random: sshd: uninitialized urandom read (32 bytes read) [ 19.152465] random: sshd: uninitialized urandom read (32 bytes read) [ 29.470777] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 34.910344] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.993630] BUG: unable to handle kernel paging request at ffffeafff9000020 [ 35.001715] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.008336] PGD 0 [ 35.010426] [ 35.012076] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.016863] Dumping ftrace buffer: [ 35.020431] (ftrace buffer empty) [ 35.024463] Modules linked in: [ 35.027785] CPU: 0 PID: 3774 Comm: syz-executor031 Not tainted 4.9.120-gf85543b #76 [ 35.036840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.046326] task: ffff8801bd3f8000 task.stack: ffff8801bada8000 [ 35.052450] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.061349] RSP: 0018:ffff8801badaf948 EFLAGS: 00010246 [ 35.066790] RAX: dffffc0000000000 RBX: ffffeafff9000000 RCX: 0000000000000000 [ 35.074167] RDX: 1ffffd5fff200004 RSI: ffffffff814f5128 RDI: ffffeafff9000000 [ 35.081575] RBP: ffff8801badaf970 R08: 0000000000034540 R09: 0000000000000001 [ 35.089055] R10: ffff8801bd3f8000 R11: 0000000000000001 R12: ffff8801badafc08 [ 35.096448] R13: ffffeafff9000020 R14: ffffeafff9000000 R15: 0000000000000001 [ 35.116192] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.124410] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.130362] CR2: ffffeafff9000020 CR3: 00000001cb271000 CR4: 00000000001606f0 [ 35.137618] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.144970] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.152239] Stack: [ 35.154380] ffffeafff9000020 ffff8801badafc08 ffff8801cb268800 ffffeafff9000000 [ 35.162410] ffff8801c4fa0268 ffff8801badaf9c8 ffffffff8154bfcf ffff8801badafc18 [ 35.170468] ffff8801badafc10 ffff8801badafc88 00003ffe400001e0 00000001cb268000 [ 35.178603] Call Trace: [ 35.181290] [] zap_huge_pmd+0x16f/0x860 [ 35.186917] [] unmap_page_range+0x12ad/0x1730 [ 35.193059] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 35.199486] [] unmap_single_vma+0x101/0x260 [ 35.205628] [] unmap_vmas+0x102/0x1d0 [ 35.211143] [] exit_mmap+0x214/0x3f0 [ 35.216507] [] ? SyS_munmap+0xa0/0xa0 [ 35.222178] [] ? up_write+0x1a/0x60 [ 35.227463] [] mmput+0xf3/0x2d0 [ 35.233068] [] do_exit+0x906/0x27b0 [ 35.238451] [] ? release_task.part.19+0x1210/0x1210 [ 35.245108] [] ? up_write+0x1a/0x60 [ 35.250369] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.257169] [] ? mprotect_fixup+0x930/0x930 [ 35.263207] [] do_group_exit+0x111/0x340 [ 35.268913] [] ? do_group_exit+0x340/0x340 [ 35.274789] [] SyS_exit_group+0x1d/0x20 [ 35.280508] [] do_syscall_64+0x1a6/0x490 [ 35.286222] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.293600] 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 [ 35.322575] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.329155] RSP [ 35.332776] CR2: ffffeafff9000020 [ 35.336229] ---[ end trace a3fda7eea4c05784 ]--- [ 35.340975] Kernel panic - not syncing: Fatal exception [ 35.347189] Dumping ftrace buffer: [ 35.351133] (ftrace buffer empty) [ 35.354831] Kernel Offset: disabled [ 35.358445] Rebooting in 86400 seconds..