[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.988586] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.581537] random: sshd: uninitialized urandom read (32 bytes read) [ 16.825619] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.324118] random: sshd: uninitialized urandom read (32 bytes read) [ 27.719339] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 33.381733] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.468974] BUG: unable to handle kernel paging request at ffffeafff8e68020 [ 33.476466] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.482724] PGD 0 [ 33.484666] [ 33.486285] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.490756] Dumping ftrace buffer: [ 33.494264] (ftrace buffer empty) [ 33.498041] Modules linked in: [ 33.501351] CPU: 0 PID: 3745 Comm: syz-executor049 Not tainted 4.9.120-gf85543b #24 [ 33.509114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.518557] task: ffff8801bec58000 task.stack: ffff8801bd518000 [ 33.524598] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.533337] RSP: 0018:ffff8801bd51f948 EFLAGS: 00010246 [ 33.538759] RAX: dffffc0000000000 RBX: ffffeafff8e68000 RCX: 0000000000000000 [ 33.546000] RDX: 1ffffd5fff1cd004 RSI: ffffffff814f5128 RDI: ffffeafff8e68000 [ 33.553298] RBP: ffff8801bd51f970 R08: 0000000000034260 R09: 0000000000000001 [ 33.560683] R10: ffff8801bec58000 R11: 0000000000000001 R12: ffff8801bd51fc08 [ 33.567934] R13: ffffeafff8e68020 R14: ffffeafff8e68000 R15: 0000000000000001 [ 33.575183] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.583403] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.589272] CR2: ffffeafff8e68020 CR3: 00000001c405c000 CR4: 00000000001606f0 [ 33.596530] Stack: [ 33.598660] ffffeafff8e68020 ffff8801bd51fc08 ffff8801c5182800 ffffeafff8e68000 [ 33.606661] ffff8801be9fa8f0 ffff8801bd51f9c8 ffffffff8154bfcf ffff8801bd51fc18 [ 33.614658] ffff8801bd51fc10 ffff8801bd51fc88 00003ffe39a001e0 00000001c5182000 [ 33.622752] Call Trace: [ 33.625318] [] zap_huge_pmd+0x16f/0x860 [ 33.630925] [] unmap_page_range+0x12ad/0x1730 [ 33.637059] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.643480] [] unmap_single_vma+0x101/0x260 [ 33.649541] [] unmap_vmas+0x102/0x1d0 [ 33.654971] [] exit_mmap+0x214/0x3f0 [ 33.660310] [] ? SyS_munmap+0xa0/0xa0 [ 33.665740] [] ? up_write+0x1a/0x60 [ 33.670996] [] mmput+0xf3/0x2d0 [ 33.675902] [] do_exit+0x906/0x27b0 [ 33.681159] [] ? release_task.part.19+0x1210/0x1210 [ 33.687807] [] ? up_write+0x1a/0x60 [ 33.693187] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.699373] [] ? mprotect_fixup+0x930/0x930 [ 33.705326] [] do_group_exit+0x111/0x340 [ 33.711018] [] ? do_group_exit+0x340/0x340 [ 33.716876] [] SyS_exit_group+0x1d/0x20 [ 33.722477] [] do_syscall_64+0x1a6/0x490 [ 33.728166] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.735061] 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 [ 33.762276] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.768613] RSP [ 33.772242] CR2: ffffeafff8e68020 [ 33.775677] ---[ end trace 93ecaa5c51640839 ]--- [ 33.780403] Kernel panic - not syncing: Fatal exception [ 33.786001] Dumping ftrace buffer: [ 33.789515] (ftrace buffer empty) [ 33.793197] Kernel Offset: disabled [ 33.796821] Rebooting in 86400 seconds..