[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.088201] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.741696] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.180790] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.716250] random: sshd: uninitialized urandom read (32 bytes read, 48 bits of entropy available) [ 23.890092] random: sshd: uninitialized urandom read (32 bytes read, 50 bits of entropy available) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 29.563065] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) executing program [ 29.648166] BUG: unable to handle kernel paging request at ffffeafff8b90008 [ 29.655523] IP: [] page_remove_rmap+0x2e/0x260 [ 29.661795] PGD 0 [ 29.664048] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.668999] Dumping ftrace buffer: [ 29.672536] (ftrace buffer empty) [ 29.676226] Modules linked in: [ 29.679533] CPU: 1 PID: 3755 Comm: syz-executor199 Not tainted 4.4.149-gf76bdbd #82 [ 29.687317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.696662] task: ffff8801cbac8000 task.stack: ffff8800b0168000 [ 29.702696] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.711402] RSP: 0018:ffff8800b016f9c0 EFLAGS: 00010246 [ 29.716832] RAX: dffffc0000000000 RBX: ffffeafff8b90000 RCX: 0000000000000000 [ 29.724081] RDX: 1ffffd5fff172001 RSI: ffffffff814bc8bf RDI: ffffeafff8b90008 [ 29.731327] RBP: ffff8800b016f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.738574] R10: 0000000000000001 R11: ffff8801cbac8000 R12: 0000000000000001 [ 29.745841] R13: 1ffff1001602df3e R14: ffff8801d236e800 R15: ffffeafff8b90000 [ 29.753097] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.761306] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.767171] CR2: ffffeafff8b90008 CR3: 00000001cbaed000 CR4: 00000000001606f0 [ 29.774424] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.781671] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.788915] Stack: [ 29.791039] ffff8800b016fc50 0000000000000001 ffff8800b016fa78 ffffffff8150a443 [ 29.799047] 00003ffe2e4001e0 00003ffe2e4001e0 0000000041b58ab3 ffffffff841ef837 [ 29.807078] ffffffff8150a240 00000000000004f0 ffff8801cc476160 ffff8800b016fa40 [ 29.815091] Call Trace: [ 29.817660] [] zap_huge_pmd+0x203/0x510 [ 29.823280] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.829838] [] unmap_single_vma+0xea3/0x1240 [ 29.835881] [] ? vm_normal_page+0x230/0x230 [ 29.841871] [] ? __put_single_page+0x60/0x60 [ 29.847920] [] unmap_vmas+0x81/0xd0 [ 29.853176] [] exit_mmap+0x1c9/0x3a0 [ 29.858529] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.865005] [] ? up_write+0x1a/0x60 [ 29.870270] [] mmput+0xf8/0x2d0 [ 29.875188] [] do_exit+0x8d8/0x26b0 [ 29.880460] [] ? file_map_prot_check+0x193/0x310 [ 29.886938] [] ? release_task.part.17+0x1200/0x1200 [ 29.893581] [] ? SyS_mprotect+0x41e/0x640 [ 29.899353] [] ? up_write+0x1a/0x60 [ 29.904606] [] ? SyS_mprotect+0x423/0x640 [ 29.910381] [] do_group_exit+0x111/0x330 [ 29.916086] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.922575] [] SyS_exit_group+0x1d/0x20 [ 29.928181] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.934728] 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 [ 29.961853] RIP [] page_remove_rmap+0x2e/0x260 [ 29.968207] RSP [ 29.971804] CR2: ffffeafff8b90008 [ 29.975243] ---[ end trace 41945c07ffaa2722 ]--- [ 29.979975] Kernel panic - not syncing: Fatal exception [ 29.985819] Dumping ftrace buffer: [ 29.989362] (ftrace buffer empty) [ 29.993283] Kernel Offset: disabled [ 29.996905] Rebooting in 86400 seconds..