[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.446675] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 54.444184] random: sshd: uninitialized urandom read (32 bytes read) [ 55.016184] random: sshd: uninitialized urandom read (32 bytes read) [ 55.393950] random: sshd: uninitialized urandom read (32 bytes read) [ 60.705749] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 66.316676] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 66.401266] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 66.408689] IP: [] page_remove_rmap+0x37/0x6d0 [ 66.414945] PGD 0 [ 66.416889] [ 66.418559] Oops: 0000 [#1] PREEMPT SMP KASAN [ 66.423034] Dumping ftrace buffer: [ 66.426560] (ftrace buffer empty) [ 66.430253] Modules linked in: [ 66.433552] CPU: 1 PID: 3831 Comm: syz-executor961 Not tainted 4.9.120-gf85543b #76 [ 66.441365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.450905] task: ffff8801b7649800 task.stack: ffff8801d91a0000 [ 66.456936] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 66.465669] RSP: 0018:ffff8801d91a7948 EFLAGS: 00010246 [ 66.471095] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 66.478391] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5128 RDI: ffffeafff9178000 [ 66.485641] RBP: ffff8801d91a7970 R08: 0000000000034ee0 R09: 0000000000000001 [ 66.492886] R10: ffff8801b7649800 R11: 0000000000000001 R12: ffff8801d91a7c08 [ 66.500239] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 66.507505] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 66.515701] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.521568] CR2: ffffeafff9178020 CR3: 00000001b98a2000 CR4: 00000000001606f0 [ 66.528821] Stack: [ 66.530941] ffffeafff9178020 ffff8801d91a7c08 ffff8801bbfbc800 ffffeafff9178000 [ 66.539000] ffff8801bd2e7790 ffff8801d91a79c8 ffffffff8154bfcf ffff8801d91a7c18 [ 66.547065] ffff8801d91a7c10 ffff8801d91a7c88 00003ffe45e001e0 00000001bbfbc000 [ 66.555130] Call Trace: [ 66.557701] [] zap_huge_pmd+0x16f/0x860 [ 66.563302] [] unmap_page_range+0x12ad/0x1730 [ 66.569428] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 66.575723] [] unmap_single_vma+0x101/0x260 [ 66.581688] [] unmap_vmas+0x102/0x1d0 [ 66.587162] [] exit_mmap+0x214/0x3f0 [ 66.592507] [] ? SyS_munmap+0xa0/0xa0 [ 66.597937] [] mmput+0xf3/0x2d0 [ 66.602914] [] do_exit+0x906/0x27b0 [ 66.608171] [] ? release_task.part.19+0x1210/0x1210 [ 66.614815] [] ? up_write+0x1a/0x60 [ 66.620071] [] ? do_mprotect_pkey+0x71d/0x890 [ 66.626196] [] ? mprotect_fixup+0x930/0x930 [ 66.632142] [] ? SyS_pwrite64+0xe8/0x170 [ 66.637835] [] do_group_exit+0x111/0x340 [ 66.643591] [] ? do_group_exit+0x340/0x340 [ 66.649565] [] SyS_exit_group+0x1d/0x20 [ 66.655164] [] do_syscall_64+0x1a6/0x490 [ 66.660852] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 66.667749] 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 [ 66.694961] RIP [] page_remove_rmap+0x37/0x6d0 [ 66.701296] RSP [ 66.704897] CR2: ffffeafff9178020 [ 66.708403] ---[ end trace 0cc562c73875be3a ]--- [ 66.713137] Kernel panic - not syncing: Fatal exception [ 66.718804] Dumping ftrace buffer: [ 66.722331] (ftrace buffer empty) [ 66.726017] Kernel Offset: disabled [ 66.729617] Rebooting in 86400 seconds..