[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.614282] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.541718] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.882788] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.696588] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 24.918248] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 30.671865] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 30.760430] BUG: unable to handle kernel paging request at ffffeafff8be0008 [ 30.767849] IP: [] page_remove_rmap+0x2e/0x260 [ 30.774199] PGD 0 [ 30.776540] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.781612] Dumping ftrace buffer: [ 30.785193] (ftrace buffer empty) [ 30.788893] Modules linked in: [ 30.792219] CPU: 0 PID: 3817 Comm: syz-executor225 Not tainted 4.4.148-gf057ff9 #81 [ 30.800000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.809345] task: ffff8801d9018000 task.stack: ffff8801d9758000 [ 30.815401] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.824111] RSP: 0018:ffff8801d975f9c0 EFLAGS: 00010246 [ 30.829544] RAX: dffffc0000000000 RBX: ffffeafff8be0000 RCX: 0000000000000000 [ 30.836803] RDX: 1ffffd5fff17c001 RSI: ffffffff814bc75f RDI: ffffeafff8be0008 [ 30.844064] RBP: ffff8801d975f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.851320] R10: 0000000000000001 R11: ffff8801d9018000 R12: 0000000000000001 [ 30.858579] R13: 1ffff1003b2ebf3e R14: ffff8801d0f14800 R15: ffffeafff8be0000 [ 30.865881] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.874238] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.880110] CR2: ffffeafff8be0008 CR3: 00000001ca13e000 CR4: 00000000001606f0 [ 30.887370] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.894633] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.901887] Stack: [ 30.904024] ffff8801d975fc50 0000000000000001 ffff8801d975fa78 ffffffff8150a1f3 [ 30.912092] 00003ffe2f8001e0 00003ffe2f8001e0 0000000041b58ab3 ffffffff841ef82f [ 30.920287] ffffffff81509ff0 00000000000004f0 ffff8801c8b10c60 ffff8801d975fa40 [ 30.928346] Call Trace: [ 30.930931] [] zap_huge_pmd+0x203/0x510 [ 30.936546] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.943125] [] unmap_single_vma+0xea3/0x1240 [ 30.949212] [] ? vm_normal_page+0x230/0x230 [ 30.955170] [] ? __put_single_page+0x60/0x60 [ 30.961269] [] unmap_vmas+0x81/0xd0 [ 30.966581] [] exit_mmap+0x1c9/0x3a0 [ 30.971935] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.978417] [] ? up_write+0x1a/0x60 [ 30.983682] [] mmput+0xf8/0x2d0 [ 30.988597] [] do_exit+0x8d8/0x26b0 [ 30.993923] [] ? file_map_prot_check+0x193/0x310 [ 31.000364] [] ? release_task.part.17+0x1200/0x1200 [ 31.007021] [] ? SyS_mprotect+0x41e/0x640 [ 31.012852] [] ? up_write+0x1a/0x60 [ 31.018120] [] ? SyS_mprotect+0x423/0x640 [ 31.023910] [] do_group_exit+0x111/0x330 [ 31.029756] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.036263] [] SyS_exit_group+0x1d/0x20 [ 31.041881] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.048444] 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 [ 31.076397] RIP [] page_remove_rmap+0x2e/0x260 [ 31.082810] RSP [ 31.086419] CR2: ffffeafff8be0008 [ 31.089916] ---[ end trace f56483cb553d8ec8 ]--- [ 31.094659] Kernel panic - not syncing: Fatal exception [ 31.100705] Dumping ftrace buffer: [ 31.104240] (ftrace buffer empty) [ 31.107938] Kernel Offset: disabled [ 31.111551] Rebooting in 86400 seconds..