[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.521285] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.275024] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.656668] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 29.466966] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 30.057190] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 35.505113] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 35.598912] BUG: unable to handle kernel paging request at ffffeafffd400008 [ 35.606276] IP: [] page_remove_rmap+0x2e/0x260 [ 35.612551] PGD 0 [ 35.614799] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.619797] Dumping ftrace buffer: [ 35.623323] (ftrace buffer empty) [ 35.627058] Modules linked in: [ 35.630346] CPU: 1 PID: 3841 Comm: syz-executor563 Not tainted 4.4.148-gf057ff9 #81 [ 35.638117] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.647444] task: ffff8801d91e9800 task.stack: ffff8800bb0b8000 [ 35.653491] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.662165] RSP: 0018:ffff8800bb0bf9c0 EFLAGS: 00010246 [ 35.667586] RAX: dffffc0000000000 RBX: ffffeafffd400000 RCX: 0000000000000000 [ 35.674833] RDX: 1ffffd5fffa80001 RSI: ffffffff814bc75f RDI: ffffeafffd400008 [ 35.682102] RBP: ffff8800bb0bf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.689348] R10: 0000000000000001 R11: ffff8801d91e9800 R12: 0000000000000001 [ 35.696592] R13: 1ffff10017617f3e R14: ffff8800b422f800 R15: ffffeafffd400000 [ 35.703845] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.712070] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.717926] CR2: ffffeafffd400008 CR3: 00000000b532f000 CR4: 00000000001606f0 [ 35.725171] Stack: [ 35.727312] ffff8800bb0bfc50 0000000000000001 ffff8800bb0bfa78 ffffffff8150a1f3 [ 35.735299] 00003fff500001e0 00003fff500001e0 0000000041b58ab3 ffffffff841ef82f [ 35.743293] ffffffff81509ff0 00000000000004f0 ffff8800b20f12c0 ffff8800bb0bfa40 [ 35.751288] Call Trace: [ 35.753861] [] zap_huge_pmd+0x203/0x510 [ 35.759479] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.766042] [] unmap_single_vma+0xea3/0x1240 [ 35.772075] [] ? vm_normal_page+0x230/0x230 [ 35.778022] [] ? __put_single_page+0x60/0x60 [ 35.784053] [] unmap_vmas+0x81/0xd0 [ 35.789315] [] exit_mmap+0x1c9/0x3a0 [ 35.794653] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.801121] [] ? up_write+0x1a/0x60 [ 35.806380] [] mmput+0xf8/0x2d0 [ 35.811284] [] do_exit+0x8d8/0x26b0 [ 35.816540] [] ? file_map_prot_check+0x193/0x310 [ 35.822919] [] ? release_task.part.17+0x1200/0x1200 [ 35.829558] [] ? SyS_mprotect+0x41e/0x640 [ 35.835331] [] ? up_write+0x1a/0x60 [ 35.840583] [] ? SyS_mprotect+0x423/0x640 [ 35.846356] [] do_group_exit+0x111/0x330 [ 35.852059] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.858524] [] SyS_exit_group+0x1d/0x20 [ 35.864122] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.870682] 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 [ 35.897711] RIP [] page_remove_rmap+0x2e/0x260 [ 35.904037] RSP [ 35.907633] CR2: ffffeafffd400008 [ 35.911059] ---[ end trace 4c208a103ba66e69 ]--- [ 35.915788] Kernel panic - not syncing: Fatal exception [ 35.921550] Dumping ftrace buffer: [ 35.925068] (ftrace buffer empty) [ 35.928752] Kernel Offset: disabled [ 35.932354] Rebooting in 86400 seconds..