[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.518453] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.660813] random: sshd: uninitialized urandom read (32 bytes read) [ 19.996066] random: sshd: uninitialized urandom read (32 bytes read) [ 20.549694] random: sshd: uninitialized urandom read (32 bytes read) [ 20.699272] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts. [ 26.306882] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.388496] BUG: unable to handle kernel paging request at ffffeafff9028020 [ 26.395835] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.402080] PGD 0 [ 26.404024] [ 26.405644] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.410113] Dumping ftrace buffer: [ 26.413622] (ftrace buffer empty) [ 26.417306] Modules linked in: [ 26.420591] CPU: 1 PID: 3798 Comm: syz-executor867 Not tainted 4.9.122-g54068d6 #26 [ 26.428354] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.437683] task: ffff8801b8a49800 task.stack: ffff8801b6b40000 [ 26.443713] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.452392] RSP: 0018:ffff8801b6b47948 EFLAGS: 00010246 [ 26.457815] RAX: dffffc0000000000 RBX: ffffeafff9028000 RCX: 0000000000000000 [ 26.465067] RDX: 1ffffd5fff205004 RSI: ffffffff814f5918 RDI: ffffeafff9028000 [ 26.472311] RBP: ffff8801b6b47970 R08: 0000000000033b80 R09: 0000000000000001 [ 26.479556] R10: ffff8801b8a49800 R11: 0000000000000001 R12: ffff8801b6b47c08 [ 26.486802] R13: ffffeafff9028020 R14: ffffeafff9028000 R15: 0000000000000001 [ 26.494047] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.502244] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.508100] CR2: ffffeafff9028020 CR3: 00000001b6eb8000 CR4: 00000000001606f0 [ 26.515350] Stack: [ 26.517479] ffffeafff9028020 ffff8801b6b47c08 ffff8801b88f7800 ffffeafff9028000 [ 26.525473] ffff8801b6a97108 ffff8801b6b479c8 ffffffff8154cb8f ffff8801b6b47c18 [ 26.533471] ffff8801b6b47c10 ffff8801b6b47c88 00003ffe40a001e0 00000001b88f7000 [ 26.541467] Call Trace: [ 26.544071] [] zap_huge_pmd+0x16f/0x860 [ 26.549684] [] unmap_page_range+0x12ad/0x1730 [ 26.555807] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.562107] [] unmap_single_vma+0x101/0x260 [ 26.568054] [] unmap_vmas+0x102/0x1d0 [ 26.573476] [] exit_mmap+0x214/0x3f0 [ 26.578812] [] ? SyS_munmap+0xa0/0xa0 [ 26.584237] [] ? up_write+0x1a/0x60 [ 26.589563] [] mmput+0xf3/0x2d0 [ 26.594478] [] do_exit+0x906/0x27b0 [ 26.599733] [] ? release_task.part.19+0x1210/0x1210 [ 26.606429] [] ? up_write+0x1a/0x60 [ 26.611692] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.617819] [] ? mprotect_fixup+0x930/0x930 [ 26.623764] [] do_group_exit+0x111/0x340 [ 26.629454] [] ? do_group_exit+0x340/0x340 [ 26.635312] [] SyS_exit_group+0x1d/0x20 [ 26.640911] [] do_syscall_64+0x1a6/0x490 [ 26.646608] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.653508] 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 [ 26.680597] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.686927] RSP [ 26.690523] CR2: ffffeafff9028020 [ 26.693948] ---[ end trace cf87d23557f4a987 ]--- [ 26.698673] Kernel panic - not syncing: Fatal exception [ 26.704352] Dumping ftrace buffer: [ 26.707872] (ftrace buffer empty) [ 26.711554] Kernel Offset: disabled [ 26.715152] Rebooting in 86400 seconds..