[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.005055] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.556691] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.892064] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.661995] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 26.839199] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 32.492828] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 32.580281] BUG: unable to handle kernel paging request at ffffeafff8ca0008 [ 32.587645] IP: [] page_remove_rmap+0x2e/0x260 [ 32.593900] PGD 0 [ 32.596149] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.601089] Dumping ftrace buffer: [ 32.604686] (ftrace buffer empty) [ 32.608376] Modules linked in: [ 32.611663] CPU: 0 PID: 3839 Comm: syz-executor846 Not tainted 4.4.149-gf76bdbd #82 [ 32.619443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.628772] task: ffff8801c842c800 task.stack: ffff8801d9368000 [ 32.634802] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.643478] RSP: 0018:ffff8801d936f9c0 EFLAGS: 00010246 [ 32.648897] RAX: dffffc0000000000 RBX: ffffeafff8ca0000 RCX: 0000000000000000 [ 32.656153] RDX: 1ffffd5fff194001 RSI: ffffffff814bc8bf RDI: ffffeafff8ca0008 [ 32.663411] RBP: ffff8801d936f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.670661] R10: 0000000000000001 R11: ffff8801c842c800 R12: 0000000000000001 [ 32.677911] R13: 1ffff1003b26df3e R14: ffff8801ca85b800 R15: ffffeafff8ca0000 [ 32.685163] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.693363] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.699216] CR2: ffffeafff8ca0008 CR3: 00000001ceb6b000 CR4: 00000000001606f0 [ 32.706461] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.713706] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.720946] Stack: [ 32.723066] ffff8801d936fc50 0000000000000001 ffff8801d936fa78 ffffffff8150a443 [ 32.731047] 00003ffe328001e0 00003ffe328001e0 0000000041b58ab3 ffffffff841ef837 [ 32.739037] ffffffff8150a240 00000000000004f0 ffff8801cbab8840 ffff8801d936fa40 [ 32.747027] Call Trace: [ 32.749594] [] zap_huge_pmd+0x203/0x510 [ 32.755198] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.761806] [] unmap_single_vma+0xea3/0x1240 [ 32.767846] [] ? vm_normal_page+0x230/0x230 [ 32.773798] [] ? __put_single_page+0x60/0x60 [ 32.779832] [] unmap_vmas+0x81/0xd0 [ 32.785082] [] exit_mmap+0x1c9/0x3a0 [ 32.790422] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.797204] [] ? up_write+0x1a/0x60 [ 32.802458] [] mmput+0xf8/0x2d0 [ 32.807366] [] do_exit+0x8d8/0x26b0 [ 32.812618] [] ? file_map_prot_check+0x193/0x310 [ 32.819000] [] ? release_task.part.17+0x1200/0x1200 [ 32.825639] [] ? SyS_mprotect+0x41e/0x640 [ 32.831417] [] ? up_write+0x1a/0x60 [ 32.836715] [] ? SyS_mprotect+0x423/0x640 [ 32.842491] [] do_group_exit+0x111/0x330 [ 32.848178] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.854649] [] SyS_exit_group+0x1d/0x20 [ 32.860255] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.866803] 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 [ 32.893660] RIP [] page_remove_rmap+0x2e/0x260 [ 32.899994] RSP [ 32.903593] CR2: ffffeafff8ca0008 [ 32.907020] ---[ end trace 83e39b21e213dd4b ]--- [ 32.911746] Kernel panic - not syncing: Fatal exception [ 32.917469] Dumping ftrace buffer: [ 32.920991] (ftrace buffer empty) [ 32.924676] Kernel Offset: disabled [ 32.928281] Rebooting in 86400 seconds..