[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.712535] 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: [ 26.824444] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.120217] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.839116] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 28.023578] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 33.451045] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 33.546599] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 33.553965] IP: [] page_remove_rmap+0x2e/0x260 [ 33.560225] PGD 0 [ 33.562464] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.567411] Dumping ftrace buffer: [ 33.570922] (ftrace buffer empty) [ 33.574620] Modules linked in: [ 33.577905] CPU: 0 PID: 3738 Comm: syz-executor017 Not tainted 4.4.148-gf057ff9 #81 [ 33.585669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.595009] task: ffff8800b1186000 task.stack: ffff8800b0fd0000 [ 33.601056] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.609733] RSP: 0018:ffff8800b0fd79c0 EFLAGS: 00010246 [ 33.615154] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: ffffea0002bf0000 [ 33.622399] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc75f RDI: ffffeafffd408008 [ 33.629645] RBP: ffff8800b0fd79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.636889] R10: 0000000000000001 R11: ffff8800b1186000 R12: 0000000000000001 [ 33.644148] R13: 1ffff100161faf3e R14: ffff8800b5bf7810 R15: ffffeafffd408000 [ 33.651393] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.659595] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.665448] CR2: ffffeafffd408008 CR3: 00000000b379f000 CR4: 00000000001606f0 [ 33.672694] Stack: [ 33.674813] ffff8800b0fd7c50 0000000000000001 ffff8800b0fd7a78 ffffffff8150a1f3 [ 33.682795] 00003fff502001a0 00003fff502001a0 0000000041b58ab3 ffffffff841ef82f [ 33.690796] ffffffff81509ff0 00000000000004f0 ffff8800b8cf8268 ffff8800b0fd7a40 [ 33.698775] Call Trace: [ 33.701339] [] zap_huge_pmd+0x203/0x510 [ 33.706936] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.713493] [] unmap_single_vma+0xea3/0x1240 [ 33.719522] [] ? vm_normal_page+0x230/0x230 [ 33.725467] [] ? __put_single_page+0x60/0x60 [ 33.731514] [] unmap_vmas+0x81/0xd0 [ 33.736770] [] exit_mmap+0x1c9/0x3a0 [ 33.742109] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.748588] [] ? up_write+0x1a/0x60 [ 33.753851] [] mmput+0xf8/0x2d0 [ 33.758753] [] do_exit+0x8d8/0x26b0 [ 33.764007] [] ? file_map_prot_check+0x193/0x310 [ 33.770389] [] ? release_task.part.17+0x1200/0x1200 [ 33.777026] [] ? SyS_mprotect+0x41e/0x640 [ 33.782800] [] ? up_write+0x1a/0x60 [ 33.788052] [] ? SyS_mprotect+0x423/0x640 [ 33.793828] [] do_group_exit+0x111/0x330 [ 33.799513] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.805980] [] SyS_exit_group+0x1d/0x20 [ 33.811587] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.818137] 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 [ 33.844951] RIP [] page_remove_rmap+0x2e/0x260 [ 33.851295] RSP [ 33.854909] CR2: ffffeafffd408008 [ 33.858335] ---[ end trace a3cc99a6bce93eae ]--- [ 33.863063] Kernel panic - not syncing: Fatal exception [ 33.868777] Dumping ftrace buffer: [ 33.872297] (ftrace buffer empty) [ 33.875982] Kernel Offset: disabled [ 33.879583] Rebooting in 86400 seconds..