[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.681952] 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: [ 26.861424] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.376530] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.023674] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 28.192068] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 33.770818] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 33.867143] BUG: unable to handle kernel paging request at ffffeafff8c20008 [ 33.874764] IP: [] page_remove_rmap+0x2e/0x260 [ 33.881184] PGD 0 [ 33.883427] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.888429] Dumping ftrace buffer: [ 33.891953] (ftrace buffer empty) [ 33.895639] Modules linked in: [ 33.898929] CPU: 1 PID: 3685 Comm: syz-executor520 Not tainted 4.4.149-gf76bdbd #82 [ 33.906693] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.916023] task: ffff8801cf259800 task.stack: ffff8801ceea8000 [ 33.922053] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.930748] RSP: 0018:ffff8801ceeaf9c0 EFLAGS: 00010246 [ 33.936167] RAX: dffffc0000000000 RBX: ffffeafff8c20000 RCX: 0000000000000000 [ 33.943410] RDX: 1ffffd5fff184001 RSI: ffffffff814bc8bf RDI: ffffeafff8c20008 [ 33.950661] RBP: ffff8801ceeaf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.958009] R10: 0000000000000001 R11: ffff8801cf259800 R12: 0000000000000001 [ 33.965366] R13: 1ffff10039dd5f3e R14: ffff8801cf871800 R15: ffffeafff8c20000 [ 33.972617] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.980817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.986813] CR2: ffffeafff8c20008 CR3: 00000001cfe1e000 CR4: 00000000001606f0 [ 33.994059] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.001302] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.008546] Stack: [ 34.010670] ffff8801ceeafc50 0000000000000001 ffff8801ceeafa78 ffffffff8150a443 [ 34.018686] 00003ffe308001e0 00003ffe308001e0 0000000041b58ab3 ffffffff841ef837 [ 34.026709] ffffffff8150a240 00000000000004f0 ffff8801cf289790 ffff8801ceeafa40 [ 34.034774] Call Trace: [ 34.037351] [] zap_huge_pmd+0x203/0x510 [ 34.042964] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.049524] [] unmap_single_vma+0xea3/0x1240 [ 34.055556] [] ? vm_normal_page+0x230/0x230 [ 34.061611] [] ? __put_single_page+0x60/0x60 [ 34.067644] [] unmap_vmas+0x81/0xd0 [ 34.072896] [] exit_mmap+0x1c9/0x3a0 [ 34.078233] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.084698] [] ? up_write+0x1a/0x60 [ 34.090175] [] mmput+0xf8/0x2d0 [ 34.095082] [] do_exit+0x8d8/0x26b0 [ 34.100521] [] ? file_map_prot_check+0x193/0x310 [ 34.106905] [] ? release_task.part.17+0x1200/0x1200 [ 34.113551] [] ? SyS_mprotect+0x41e/0x640 [ 34.119331] [] ? up_write+0x1a/0x60 [ 34.124580] [] ? SyS_mprotect+0x423/0x640 [ 34.130353] [] do_group_exit+0x111/0x330 [ 34.136037] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.142518] [] SyS_exit_group+0x1d/0x20 [ 34.148123] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.154671] 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 [ 34.181588] RIP [] page_remove_rmap+0x2e/0x260 [ 34.187920] RSP [ 34.191524] CR2: ffffeafff8c20008 [ 34.194956] ---[ end trace 37a48360a5f23c28 ]--- [ 34.199683] Kernel panic - not syncing: Fatal exception [ 34.205404] Dumping ftrace buffer: [ 34.208928] (ftrace buffer empty) [ 34.212612] Kernel Offset: disabled [ 34.216211] Rebooting in 86400 seconds..