[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.687084] 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: [ 25.970247] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.412009] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.096235] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 27.266197] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 32.782269] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 32.867432] BUG: unable to handle kernel paging request at ffffeafff8c70008 [ 32.874905] IP: [] page_remove_rmap+0x2e/0x260 [ 32.881154] PGD 0 [ 32.883447] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.888408] Dumping ftrace buffer: [ 32.891921] (ftrace buffer empty) [ 32.895608] Modules linked in: [ 32.898896] CPU: 0 PID: 3814 Comm: syz-executor814 Not tainted 4.4.150-g5541782 #83 [ 32.906663] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.916104] task: ffff8801d9109800 task.stack: ffff8801d3d10000 [ 32.922142] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.930833] RSP: 0018:ffff8801d3d179c0 EFLAGS: 00010246 [ 32.936271] RAX: dffffc0000000000 RBX: ffffeafff8c70000 RCX: 0000000000000000 [ 32.943518] RDX: 1ffffd5fff18e001 RSI: ffffffff814bceaf RDI: ffffeafff8c70008 [ 32.950777] RBP: ffff8801d3d179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.958029] R10: 0000000000000001 R11: ffff8801d9109800 R12: 0000000000000001 [ 32.965281] R13: 1ffff1003a7a2f3e R14: ffff8801cda33800 R15: ffffeafff8c70000 [ 32.972533] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.980742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.986720] CR2: ffffeafff8c70008 CR3: 00000001cda9c000 CR4: 00000000001606f0 [ 32.993970] Stack: [ 32.996099] ffff8801d3d17c50 0000000000000001 ffff8801d3d17a78 ffffffff8150ad13 [ 33.004086] 00003ffe31c001e0 00003ffe31c001e0 0000000041b58ab3 ffffffff841ef837 [ 33.012108] ffffffff8150ab10 00000000000004f0 ffff8801d964e4d0 ffff8801d3d17a40 [ 33.020100] Call Trace: [ 33.022669] [] zap_huge_pmd+0x203/0x510 [ 33.028274] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.034834] [] unmap_single_vma+0xea3/0x1240 [ 33.040886] [] ? vm_normal_page+0x280/0x280 [ 33.046840] [] ? __put_single_page+0x60/0x60 [ 33.052884] [] unmap_vmas+0x81/0xd0 [ 33.058145] [] exit_mmap+0x1c9/0x3a0 [ 33.063495] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.070034] [] ? up_write+0x1a/0x60 [ 33.075297] [] mmput+0xf8/0x2d0 [ 33.080285] [] do_exit+0x8d8/0x26b0 [ 33.085661] [] ? file_map_prot_check+0x193/0x310 [ 33.092051] [] ? release_task.part.17+0x1200/0x1200 [ 33.098698] [] ? SyS_mprotect+0x41e/0x640 [ 33.104475] [] ? up_write+0x1a/0x60 [ 33.109728] [] ? SyS_mprotect+0x423/0x640 [ 33.115508] [] do_group_exit+0x111/0x330 [ 33.121199] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.127672] [] SyS_exit_group+0x1d/0x20 [ 33.133284] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.139842] 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 [ 33.166919] RIP [] page_remove_rmap+0x2e/0x260 [ 33.173253] RSP [ 33.176858] CR2: ffffeafff8c70008 [ 33.180287] ---[ end trace 3782d10ddc0a2af8 ]--- [ 33.185022] Kernel panic - not syncing: Fatal exception [ 33.190698] Dumping ftrace buffer: [ 33.194304] (ftrace buffer empty) [ 33.198002] Kernel Offset: disabled [ 33.201606] Rebooting in 86400 seconds..