[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.045995] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.149750] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.527163] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 29.311034] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) [ 29.483908] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 35.014384] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) executing program [ 35.099419] BUG: unable to handle kernel paging request at ffffeafff8c40008 [ 35.106936] IP: [] page_remove_rmap+0x2e/0x260 [ 35.113190] PGD 0 [ 35.115434] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.120438] Dumping ftrace buffer: [ 35.123954] (ftrace buffer empty) [ 35.127639] Modules linked in: [ 35.130929] CPU: 0 PID: 3826 Comm: syz-executor826 Not tainted 4.4.150-g5541782 #83 [ 35.138763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.148105] task: ffff8801d92fe000 task.stack: ffff8801d91d0000 [ 35.154141] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.162822] RSP: 0018:ffff8801d91d79c0 EFLAGS: 00010246 [ 35.168246] RAX: dffffc0000000000 RBX: ffffeafff8c40000 RCX: 0000000000000000 [ 35.175499] RDX: 1ffffd5fff188001 RSI: ffffffff814bceaf RDI: ffffeafff8c40008 [ 35.182752] RBP: ffff8801d91d79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 35.190005] R10: 0000000000000001 R11: ffff8801d92fe000 R12: 0000000000000001 [ 35.197261] R13: 1ffff1003b23af3e R14: ffff8801cc638800 R15: ffffeafff8c40000 [ 35.204549] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.212761] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.218620] CR2: ffffeafff8c40008 CR3: 00000001cb025000 CR4: 00000000001606f0 [ 35.225914] Stack: [ 35.228048] ffff8801d91d7c50 0000000000000001 ffff8801d91d7a78 ffffffff8150ad13 [ 35.236035] 00003ffe310001e0 00003ffe310001e0 0000000041b58ab3 ffffffff841ef837 [ 35.244033] ffffffff8150ab10 00000000000004f0 ffff8801cf1ccf20 ffff8801d91d7a40 [ 35.252030] Call Trace: [ 35.254600] [] zap_huge_pmd+0x203/0x510 [ 35.260208] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.266767] [] unmap_single_vma+0xea3/0x1240 [ 35.272810] [] ? vm_normal_page+0x280/0x280 [ 35.278781] [] ? __put_single_page+0x60/0x60 [ 35.284832] [] unmap_vmas+0x81/0xd0 [ 35.290088] [] exit_mmap+0x1c9/0x3a0 [ 35.295437] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.301916] [] ? kmem_cache_free+0x2b4/0x340 [ 35.307959] [] mmput+0xf8/0x2d0 [ 35.312871] [] do_exit+0x8d8/0x26b0 [ 35.318133] [] ? file_map_prot_check+0x193/0x310 [ 35.324587] [] ? release_task.part.17+0x1200/0x1200 [ 35.331335] [] ? SyS_mprotect+0x41e/0x640 [ 35.337116] [] ? up_write+0x1a/0x60 [ 35.342377] [] ? SyS_mprotect+0x423/0x640 [ 35.348160] [] do_group_exit+0x111/0x330 [ 35.353952] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.360426] [] SyS_exit_group+0x1d/0x20 [ 35.366035] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.372589] 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 [ 35.399575] RIP [] page_remove_rmap+0x2e/0x260 [ 35.405913] RSP [ 35.409588] CR2: ffffeafff8c40008 [ 35.413035] ---[ end trace a648872dabe749fa ]--- [ 35.417827] Kernel panic - not syncing: Fatal exception [ 35.423438] Dumping ftrace buffer: [ 35.426957] (ftrace buffer empty) [ 35.430648] Kernel Offset: disabled [ 35.434253] Rebooting in 86400 seconds..