[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.534856] 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: [ 25.122221] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.512269] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.242853] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 26.425770] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. [ 31.945899] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 32.037834] BUG: unable to handle kernel paging request at ffffeafff8d88008 [ 32.045224] IP: [] page_remove_rmap+0x2e/0x260 [ 32.051510] PGD 0 [ 32.053752] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.058738] Dumping ftrace buffer: [ 32.062272] (ftrace buffer empty) [ 32.065961] Modules linked in: [ 32.069249] CPU: 1 PID: 3848 Comm: syz-executor269 Not tainted 4.4.150-g5541782 #83 [ 32.077015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.086346] task: ffff8801c77be000 task.stack: ffff8801d8da0000 [ 32.092380] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.101081] RSP: 0018:ffff8801d8da79c0 EFLAGS: 00010246 [ 32.106521] RAX: dffffc0000000000 RBX: ffffeafff8d88000 RCX: 0000000000000000 [ 32.113781] RDX: 1ffffd5fff1b1001 RSI: ffffffff814bceaf RDI: ffffeafff8d88008 [ 32.121031] RBP: ffff8801d8da79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.128298] R10: 0000000000000001 R11: ffff8801c77be000 R12: 0000000000000001 [ 32.135545] R13: 1ffff1003b1b4f3e R14: ffff8801ca5ea800 R15: ffffeafff8d88000 [ 32.142807] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.151028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.156905] CR2: ffffeafff8d88008 CR3: 00000001ca6b5000 CR4: 00000000001606f0 [ 32.164165] Stack: [ 32.166292] ffff8801d8da7c50 0000000000000001 ffff8801d8da7a78 ffffffff8150ad13 [ 32.174321] 00003ffe362001e0 00003ffe362001e0 0000000041b58ab3 ffffffff841ef837 [ 32.182374] ffffffff8150ab10 00000000000004f0 ffff8800bb831210 ffff8801d8da7a40 [ 32.190439] Call Trace: [ 32.193031] [] zap_huge_pmd+0x203/0x510 [ 32.198647] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.205222] [] unmap_single_vma+0xea3/0x1240 [ 32.211265] [] ? vm_normal_page+0x280/0x280 [ 32.217229] [] ? __put_single_page+0x60/0x60 [ 32.223272] [] unmap_vmas+0x81/0xd0 [ 32.228547] [] exit_mmap+0x1c9/0x3a0 [ 32.233923] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.240398] [] ? up_write+0x1a/0x60 [ 32.245658] [] mmput+0xf8/0x2d0 [ 32.250567] [] do_exit+0x8d8/0x26b0 [ 32.255832] [] ? file_map_prot_check+0x193/0x310 [ 32.262222] [] ? release_task.part.17+0x1200/0x1200 [ 32.268867] [] ? SyS_mprotect+0x41e/0x640 [ 32.274660] [] ? up_write+0x1a/0x60 [ 32.279918] [] ? SyS_mprotect+0x423/0x640 [ 32.285694] [] do_group_exit+0x111/0x330 [ 32.291381] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.297874] [] SyS_exit_group+0x1d/0x20 [ 32.303510] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.310059] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 32.337631] RIP [] page_remove_rmap+0x2e/0x260 [ 32.343971] RSP [ 32.347571] CR2: ffffeafff8d88008 [ 32.351026] ---[ end trace ae8163fe3dd1acdc ]--- [ 32.355790] Kernel panic - not syncing: Fatal exception [ 32.361471] Dumping ftrace buffer: [ 32.364995] (ftrace buffer empty) [ 32.368681] Kernel Offset: disabled [ 32.372280] Rebooting in 86400 seconds..