[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.066469] 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: [ 25.466795] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.816786] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.374356] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) [ 26.561209] random: sshd: uninitialized urandom read (32 bytes read, 54 bits of entropy available) Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 32.138707] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) executing program [ 32.229695] BUG: unable to handle kernel paging request at ffffeafff8cf0008 [ 32.237250] IP: [] page_remove_rmap+0x2e/0x260 [ 32.243542] PGD 0 [ 32.245826] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.250965] Dumping ftrace buffer: [ 32.254495] (ftrace buffer empty) [ 32.258321] Modules linked in: [ 32.261643] CPU: 0 PID: 3846 Comm: syz-executor785 Not tainted 4.4.148-gf057ff9 #81 [ 32.269428] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.279099] task: ffff8801d948b000 task.stack: ffff8801ccc38000 [ 32.285364] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.294289] RSP: 0018:ffff8801ccc3f9c0 EFLAGS: 00010246 [ 32.299948] RAX: dffffc0000000000 RBX: ffffeafff8cf0000 RCX: 0000000000000000 [ 32.307526] RDX: 1ffffd5fff19e001 RSI: ffffffff814bc75f RDI: ffffeafff8cf0008 [ 32.314921] RBP: ffff8801ccc3f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.314925] R10: 0000000000000001 R11: ffff8801d948b000 R12: 0000000000000001 [ 32.314929] R13: 1ffff10039987f3e R14: ffff8801cbcef800 R15: ffffeafff8cf0000 [ 32.314935] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.314939] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.314943] CR2: ffffeafff8cf0008 CR3: 00000001ccdf3000 CR4: 00000000001606f0 [ 32.314951] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.314955] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.314956] Stack: [ 32.314966] ffff8801ccc3fc50 0000000000000001 ffff8801ccc3fa78 ffffffff8150a1f3 [ 32.314974] 00003ffe33c001e0 00003ffe33c001e0 0000000041b58ab3 ffffffff841ef82f [ 32.314982] ffffffff81509ff0 00000000000004f0 ffff8801cf2ff2c0 ffff8801ccc3fa40 [ 32.314984] Call Trace: [ 32.314997] [] zap_huge_pmd+0x203/0x510 [ 32.315010] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.315017] [] unmap_single_vma+0xea3/0x1240 [ 32.315023] [] ? vm_normal_page+0x230/0x230 [ 32.315061] [] ? __put_single_page+0x60/0x60 [ 32.315067] [] unmap_vmas+0x81/0xd0 [ 32.315075] [] exit_mmap+0x1c9/0x3a0 [ 32.315082] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.315091] [] ? up_write+0x1a/0x60 [ 32.315100] [] mmput+0xf8/0x2d0 [ 32.315106] [] do_exit+0x8d8/0x26b0 [ 32.315115] [] ? file_map_prot_check+0x193/0x310 [ 32.315122] [] ? release_task.part.17+0x1200/0x1200 [ 32.315130] [] ? SyS_mprotect+0x41e/0x640 [ 32.315137] [] ? up_write+0x1a/0x60 [ 32.315144] [] ? SyS_mprotect+0x423/0x640 [ 32.315150] [] do_group_exit+0x111/0x330 [ 32.315173] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.315180] [] SyS_exit_group+0x1d/0x20 [ 32.315190] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.315294] 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 [ 32.315304] RIP [] page_remove_rmap+0x2e/0x260 [ 32.315306] RSP [ 32.315309] CR2: ffffeafff8cf0008 [ 32.315316] ---[ end trace 730cdaee9eb11e3a ]--- [ 32.315320] Kernel panic - not syncing: Fatal exception [ 32.322902] Dumping ftrace buffer: [ 32.322906] (ftrace buffer empty) [ 32.322909] Kernel Offset: disabled [ 32.575640] Rebooting in 86400 seconds..