[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.116969] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.162494] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.595739] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.332969] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 27.511425] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 33.062799] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 33.150869] BUG: unable to handle kernel paging request at ffffeafffd348008 [ 33.158234] IP: [] page_remove_rmap+0x2e/0x260 [ 33.164493] PGD 0 [ 33.166744] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.171699] Dumping ftrace buffer: [ 33.175213] (ftrace buffer empty) [ 33.178901] Modules linked in: [ 33.182197] CPU: 1 PID: 3848 Comm: syz-executor228 Not tainted 4.4.149-gf76bdbd #82 [ 33.189968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.199351] task: ffff8801d913e000 task.stack: ffff8800bac10000 [ 33.205403] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.214135] RSP: 0018:ffff8800bac179c0 EFLAGS: 00010246 [ 33.219673] RAX: dffffc0000000000 RBX: ffffeafffd348000 RCX: 0000000000000000 [ 33.226940] RDX: 1ffffd5fffa69001 RSI: ffffffff814bc8bf RDI: ffffeafffd348008 [ 33.234236] RBP: ffff8800bac179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.241491] R10: 0000000000000001 R11: ffff8801d913e000 R12: 0000000000000001 [ 33.248743] R13: 1ffff10017582f3e R14: ffff8800af7cd800 R15: ffffeafffd348000 [ 33.255998] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.264209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.270069] CR2: ffffeafffd348008 CR3: 00000000af7c8000 CR4: 00000000001606f0 [ 33.277320] Stack: [ 33.279446] ffff8800bac17c50 0000000000000001 ffff8800bac17a78 ffffffff8150a443 [ 33.287604] 00003fff4d2001e0 00003fff4d2001e0 0000000041b58ab3 ffffffff841ef837 [ 33.295729] ffffffff8150a240 00000000000004f0 ffff8800b2bcbcb8 ffff8800bac17a40 [ 33.303789] Call Trace: [ 33.306356] [] zap_huge_pmd+0x203/0x510 [ 33.312007] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.318575] [] unmap_single_vma+0xea3/0x1240 [ 33.324615] [] ? vm_normal_page+0x230/0x230 [ 33.330575] [] ? __put_single_page+0x60/0x60 [ 33.336616] [] unmap_vmas+0x81/0xd0 [ 33.341892] [] exit_mmap+0x1c9/0x3a0 [ 33.341896] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.341903] [] ? up_write+0x1a/0x60 [ 33.341910] [] mmput+0xf8/0x2d0 [ 33.341914] [] do_exit+0x8d8/0x26b0 [ 33.341922] [] ? file_map_prot_check+0x193/0x310 [ 33.341926] [] ? release_task.part.17+0x1200/0x1200 [ 33.341930] [] ? SyS_mprotect+0x41e/0x640 [ 33.341934] [] ? up_write+0x1a/0x60 [ 33.341938] [] ? SyS_mprotect+0x423/0x640 [ 33.341942] [] do_group_exit+0x111/0x330 [ 33.341948] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.341951] [] SyS_exit_group+0x1d/0x20 [ 33.341958] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.342019] 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 [ 33.342025] RIP [] page_remove_rmap+0x2e/0x260 [ 33.342026] RSP [ 33.342028] CR2: ffffeafffd348008 [ 33.342034] ---[ end trace 2ed5ce78de78bfc8 ]--- [ 33.342038] Kernel panic - not syncing: Fatal exception [ 33.342289] Dumping ftrace buffer: [ 33.342293] (ftrace buffer empty) [ 33.342295] Kernel Offset: disabled [ 33.477359] Rebooting in 86400 seconds..