[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.434868] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.428698] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.738305] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 29.293874] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 43.027370] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 48.590145] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 48.680051] BUG: unable to handle kernel paging request at ffffeafff8ce0008 [ 48.687397] IP: [] page_remove_rmap+0x2e/0x260 [ 48.693648] PGD 0 [ 48.695896] Oops: 0000 [#1] PREEMPT SMP KASAN [ 48.700934] Dumping ftrace buffer: [ 48.704453] (ftrace buffer empty) [ 48.708192] Modules linked in: [ 48.711487] CPU: 1 PID: 3815 Comm: syz-executor419 Not tainted 4.4.148-gf057ff9 #81 [ 48.719252] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.728579] task: ffff8800ae9ac800 task.stack: ffff8801d91a0000 [ 48.734605] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 48.743281] RSP: 0018:ffff8801d91a79c0 EFLAGS: 00010246 [ 48.748701] RAX: dffffc0000000000 RBX: ffffeafff8ce0000 RCX: 0000000000000000 [ 48.755944] RDX: 1ffffd5fff19c001 RSI: ffffffff814bc75f RDI: ffffeafff8ce0008 [ 48.763194] RBP: ffff8801d91a79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 48.770484] R10: 0000000000000001 R11: ffff8800ae9ac800 R12: 0000000000000001 [ 48.777738] R13: 1ffff1003b234f3e R14: ffff8801cf4e7800 R15: ffffeafff8ce0000 [ 48.784982] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 48.793181] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.799032] CR2: ffffeafff8ce0008 CR3: 00000001c9fa4000 CR4: 00000000001606f0 [ 48.806275] Stack: [ 48.808393] ffff8801d91a7c50 0000000000000001 ffff8801d91a7a78 ffffffff8150a1f3 [ 48.816392] 00003ffe338001e0 00003ffe338001e0 0000000041b58ab3 ffffffff841ef82f [ 48.824421] ffffffff81509ff0 00000000000004f0 ffff8801ce7d8898 ffff8801d91a7a40 [ 48.832485] Call Trace: [ 48.835053] [] zap_huge_pmd+0x203/0x510 [ 48.840653] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 48.847209] [] unmap_single_vma+0xea3/0x1240 [ 48.853246] [] ? vm_normal_page+0x230/0x230 [ 48.859199] [] ? __put_single_page+0x60/0x60 [ 48.865230] [] unmap_vmas+0x81/0xd0 [ 48.870492] [] exit_mmap+0x1c9/0x3a0 [ 48.875827] [] ? SyS_remap_file_pages+0x870/0x870 [ 48.882295] [] ? up_write+0x1a/0x60 [ 48.887592] [] mmput+0xf8/0x2d0 [ 48.892516] [] do_exit+0x8d8/0x26b0 [ 48.897767] [] ? file_map_prot_check+0x193/0x310 [ 48.904187] [] ? release_task.part.17+0x1200/0x1200 [ 48.910841] [] ? SyS_mprotect+0x41e/0x640 [ 48.916641] [] ? up_write+0x1a/0x60 [ 48.921932] [] ? SyS_mprotect+0x423/0x640 [ 48.927719] [] do_group_exit+0x111/0x330 [ 48.933405] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 48.939871] [] SyS_exit_group+0x1d/0x20 [ 48.945474] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 48.952024] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 48.978939] RIP [] page_remove_rmap+0x2e/0x260 [ 48.985264] RSP [ 48.988863] CR2: ffffeafff8ce0008 [ 48.992291] ---[ end trace 726b6623e05404d4 ]--- [ 48.997017] Kernel panic - not syncing: Fatal exception [ 49.002675] Dumping ftrace buffer: [ 49.006194] (ftrace buffer empty) [ 49.009875] Kernel Offset: disabled [ 49.013473] Rebooting in 86400 seconds..