[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.576441] 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: [ 26.459733] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.019170] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.616270] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 27.791902] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 33.335837] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) executing program [ 33.428746] BUG: unable to handle kernel paging request at ffffeafff8c18008 [ 33.436108] IP: [] page_remove_rmap+0x2e/0x260 [ 33.442357] PGD 0 [ 33.444599] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.449556] Dumping ftrace buffer: [ 33.453069] (ftrace buffer empty) [ 33.456754] Modules linked in: [ 33.460040] CPU: 0 PID: 3812 Comm: syz-executor028 Not tainted 4.4.150-g5541782 #83 [ 33.467807] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.477156] task: ffff8801c988b000 task.stack: ffff8801d96b0000 [ 33.483186] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.491867] RSP: 0018:ffff8801d96b79c0 EFLAGS: 00010246 [ 33.497308] RAX: dffffc0000000000 RBX: ffffeafff8c18000 RCX: 0000000000000000 [ 33.504553] RDX: 1ffffd5fff183001 RSI: ffffffff814bceaf RDI: ffffeafff8c18008 [ 33.511798] RBP: ffff8801d96b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.519302] R10: 0000000000000001 R11: ffff8801c988b000 R12: 0000000000000001 [ 33.526547] R13: 1ffff1003b2d6f3e R14: ffff8801d1b70800 R15: ffffeafff8c18000 [ 33.533793] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.541991] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.547862] CR2: ffffeafff8c18008 CR3: 00000001c982d000 CR4: 00000000001606f0 [ 33.555107] Stack: [ 33.557227] ffff8801d96b7c50 0000000000000001 ffff8801d96b7a78 ffffffff8150ad13 [ 33.565293] 00003ffe306001e0 00003ffe306001e0 0000000041b58ab3 ffffffff841ef837 [ 33.573301] ffffffff8150ab10 00000000000004f0 ffff8801d348e058 ffff8801d96b7a40 [ 33.581293] Call Trace: [ 33.583857] [] zap_huge_pmd+0x203/0x510 [ 33.589466] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.596042] [] unmap_single_vma+0xea3/0x1240 [ 33.602073] [] ? vm_normal_page+0x280/0x280 [ 33.608024] [] ? __put_single_page+0x60/0x60 [ 33.614057] [] unmap_vmas+0x81/0xd0 [ 33.619308] [] exit_mmap+0x1c9/0x3a0 [ 33.624645] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.631129] [] ? up_write+0x1a/0x60 [ 33.636383] [] mmput+0xf8/0x2d0 [ 33.641283] [] do_exit+0x8d8/0x26b0 [ 33.646547] [] ? file_map_prot_check+0x193/0x310 [ 33.652925] [] ? release_task.part.17+0x1200/0x1200 [ 33.659567] [] ? SyS_mprotect+0x41e/0x640 [ 33.665339] [] ? up_write+0x1a/0x60 [ 33.670591] [] ? SyS_mprotect+0x423/0x640 [ 33.676366] [] do_group_exit+0x111/0x330 [ 33.682063] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.688540] [] SyS_exit_group+0x1d/0x20 [ 33.694157] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.700704] 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 [ 33.727449] RIP [] page_remove_rmap+0x2e/0x260 [ 33.733786] RSP [ 33.737386] CR2: ffffeafff8c18008 [ 33.740815] ---[ end trace 6e42370c43925459 ]--- [ 33.745547] Kernel panic - not syncing: Fatal exception [ 33.751211] Dumping ftrace buffer: [ 33.754731] (ftrace buffer empty) [ 33.758413] Kernel Offset: disabled [ 33.762015] Rebooting in 86400 seconds..