[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.302078] 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: [ 24.091588] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.579698] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.271685] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 43.515344] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 49.162642] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 49.247771] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 49.255106] IP: [] page_remove_rmap+0x2e/0x260 [ 49.261406] PGD 0 [ 49.263634] Oops: 0000 [#1] PREEMPT SMP KASAN [ 49.268577] Dumping ftrace buffer: [ 49.272115] (ftrace buffer empty) [ 49.275807] Modules linked in: [ 49.279095] CPU: 1 PID: 3804 Comm: syz-executor539 Not tainted 4.4.150-g5541782 #83 [ 49.286875] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.296194] task: ffff8800afab4800 task.stack: ffff8801d9028000 [ 49.302220] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 49.310885] RSP: 0018:ffff8801d902f9c0 EFLAGS: 00010246 [ 49.316303] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 49.323548] RDX: 1ffffd5fff19b001 RSI: ffffffff814bceaf RDI: ffffeafff8cd8008 [ 49.330794] RBP: ffff8801d902f9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 49.338036] R10: 0000000000000001 R11: ffff8800afab4800 R12: 0000000000000001 [ 49.345274] R13: 1ffff1003b205f3e R14: ffff8801d1d53800 R15: ffffeafff8cd8000 [ 49.352516] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 49.360711] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.366564] CR2: ffffeafff8cd8008 CR3: 00000001d04c7000 CR4: 00000000001606f0 [ 49.373807] Stack: [ 49.375927] ffff8801d902fc50 0000000000000001 ffff8801d902fa78 ffffffff8150ad13 [ 49.383947] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 49.391968] ffffffff8150ab10 00000000000004f0 ffff8801d0681cb8 ffff8801d902fa40 [ 49.399974] Call Trace: [ 49.402536] [] zap_huge_pmd+0x203/0x510 [ 49.408134] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 49.414689] [] unmap_single_vma+0xea3/0x1240 [ 49.420731] [] ? vm_normal_page+0x280/0x280 [ 49.426679] [] ? __put_single_page+0x60/0x60 [ 49.432708] [] unmap_vmas+0x81/0xd0 [ 49.437954] [] exit_mmap+0x1c9/0x3a0 [ 49.443347] [] ? SyS_remap_file_pages+0x870/0x870 [ 49.449820] [] ? up_write+0x1a/0x60 [ 49.455084] [] mmput+0xf8/0x2d0 [ 49.460015] [] do_exit+0x8d8/0x26b0 [ 49.465267] [] ? file_map_prot_check+0x193/0x310 [ 49.471638] [] ? release_task.part.17+0x1200/0x1200 [ 49.478393] [] ? SyS_mprotect+0x41e/0x640 [ 49.484171] [] ? up_write+0x1a/0x60 [ 49.489432] [] ? SyS_mprotect+0x423/0x640 [ 49.495216] [] do_group_exit+0x111/0x330 [ 49.500901] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 49.507364] [] SyS_exit_group+0x1d/0x20 [ 49.512962] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 49.519506] 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 [ 49.546260] RIP [] page_remove_rmap+0x2e/0x260 [ 49.552591] RSP [ 49.556187] CR2: ffffeafff8cd8008 [ 49.559613] ---[ end trace 5d095c270151137c ]--- [ 49.564340] Kernel panic - not syncing: Fatal exception [ 49.569934] Dumping ftrace buffer: [ 49.573454] (ftrace buffer empty) [ 49.577138] Kernel Offset: disabled [ 49.580737] Rebooting in 86400 seconds..