[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.399136] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.496826] random: sshd: uninitialized urandom read (32 bytes read) [ 18.826312] random: sshd: uninitialized urandom read (32 bytes read) [ 19.383680] random: sshd: uninitialized urandom read (32 bytes read) [ 35.920801] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 41.592133] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.696071] BUG: unable to handle kernel paging request at ffffeafff9128020 [ 41.703432] IP: [] page_remove_rmap+0x37/0x6d0 [ 41.709681] PGD 0 [ 41.711626] [ 41.713250] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.717717] Dumping ftrace buffer: [ 41.721299] (ftrace buffer empty) [ 41.724991] Modules linked in: [ 41.728292] CPU: 0 PID: 3804 Comm: syz-executor442 Not tainted 4.9.122-g54068d6 #78 [ 41.736060] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.745509] task: ffff8801b76c1800 task.stack: ffff8801d9828000 [ 41.751546] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 41.760233] RSP: 0018:ffff8801d982f948 EFLAGS: 00010246 [ 41.765670] RAX: dffffc0000000000 RBX: ffffeafff9128000 RCX: 0000000000000000 [ 41.772918] RDX: 1ffffd5fff225004 RSI: ffffffff814f5918 RDI: ffffeafff9128000 [ 41.780167] RBP: ffff8801d982f970 R08: 0000000000034380 R09: 0000000000000001 [ 41.787519] R10: ffff8801b76c1800 R11: 0000000000000001 R12: ffff8801d982fc08 [ 41.794770] R13: ffffeafff9128020 R14: ffffeafff9128000 R15: 0000000000000001 [ 41.802140] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.810345] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.816207] CR2: ffffeafff9128020 CR3: 00000001c7a60000 CR4: 00000000001606f0 [ 41.823464] Stack: [ 41.825596] ffffeafff9128020 ffff8801d982fc08 ffff8801c7b6b800 ffffeafff9128000 [ 41.833603] ffff8801c78d8580 ffff8801d982f9c8 ffffffff8154cb8f ffff8801d982fc18 [ 41.841598] ffff8801d982fc10 ffff8801d982fc88 00003ffe44a001e0 00000001c7b6b000 [ 41.849588] Call Trace: [ 41.852157] [] zap_huge_pmd+0x16f/0x860 [ 41.857806] [] unmap_page_range+0x12ad/0x1730 [ 41.863939] [] ? vm_normal_page_pmd+0x310/0x310 [ 41.870233] [] unmap_single_vma+0x101/0x260 [ 41.876185] [] unmap_vmas+0x102/0x1d0 [ 41.881617] [] exit_mmap+0x214/0x3f0 [ 41.886962] [] ? SyS_munmap+0xa0/0xa0 [ 41.892397] [] ? up_write+0x1a/0x60 [ 41.897674] [] mmput+0xf3/0x2d0 [ 41.902621] [] do_exit+0x906/0x27b0 [ 41.907895] [] ? release_task.part.19+0x1210/0x1210 [ 41.914540] [] ? up_write+0x1a/0x60 [ 41.919794] [] ? do_mprotect_pkey+0x71d/0x890 [ 41.925919] [] ? mprotect_fixup+0x930/0x930 [ 41.931870] [] do_group_exit+0x111/0x340 [ 41.937558] [] ? do_group_exit+0x340/0x340 [ 41.943429] [] SyS_exit_group+0x1d/0x20 [ 41.949029] [] do_syscall_64+0x1a6/0x490 [ 41.954722] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 41.961634] 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 [ 41.988990] RIP [] page_remove_rmap+0x37/0x6d0 [ 41.995335] RSP [ 41.998934] CR2: ffffeafff9128020 [ 42.002367] ---[ end trace 0b88458c8fa2ad44 ]--- [ 42.007107] Kernel panic - not syncing: Fatal exception [ 42.012719] Dumping ftrace buffer: [ 42.016278] (ftrace buffer empty) [ 42.019971] Kernel Offset: disabled [ 42.023584] Rebooting in 86400 seconds..