[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.452511] 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: [ 26.664862] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.993233] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.702384] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 27.887587] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts. [ 33.571880] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.668562] BUG: unable to handle kernel paging request at ffffeafff8cc8008 [ 33.675941] IP: [] page_remove_rmap+0x2e/0x260 [ 33.682192] PGD 0 [ 33.684434] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.689383] Dumping ftrace buffer: [ 33.692906] (ftrace buffer empty) [ 33.696589] Modules linked in: [ 33.699875] CPU: 1 PID: 3849 Comm: syz-executor449 Not tainted 4.4.149-gf76bdbd #82 [ 33.707642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.716973] task: ffff8800ac081800 task.stack: ffff8801c6500000 [ 33.723022] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.731701] RSP: 0018:ffff8801c65079c0 EFLAGS: 00010246 [ 33.737123] RAX: dffffc0000000000 RBX: ffffeafff8cc8000 RCX: 0000000000000000 [ 33.744377] RDX: 1ffffd5fff199001 RSI: ffffffff814bc8bf RDI: ffffeafff8cc8008 [ 33.751622] RBP: ffff8801c65079d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.758866] R10: 0000000000000001 R11: ffff8800ac081800 R12: 0000000000000001 [ 33.766110] R13: 1ffff10038ca0f3e R14: ffff8801c9da9800 R15: ffffeafff8cc8000 [ 33.773358] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.781557] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.787412] CR2: ffffeafff8cc8008 CR3: 00000001d097a000 CR4: 00000000001606f0 [ 33.794666] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.801913] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.809155] Stack: [ 33.811295] ffff8801c6507c50 0000000000000001 ffff8801c6507a78 ffffffff8150a443 [ 33.819306] 00003ffe332001e0 00003ffe332001e0 0000000041b58ab3 ffffffff841ef837 [ 33.827314] ffffffff8150a240 00000000000004f0 ffff8800bb948dc0 ffff8801c6507a40 [ 33.835301] Call Trace: [ 33.837865] [] zap_huge_pmd+0x203/0x510 [ 33.843468] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.850023] [] unmap_single_vma+0xea3/0x1240 [ 33.856056] [] ? vm_normal_page+0x230/0x230 [ 33.862004] [] ? __put_single_page+0x60/0x60 [ 33.868037] [] unmap_vmas+0x81/0xd0 [ 33.873308] [] exit_mmap+0x1c9/0x3a0 [ 33.878648] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.885117] [] ? up_write+0x1a/0x60 [ 33.890371] [] mmput+0xf8/0x2d0 [ 33.895276] [] do_exit+0x8d8/0x26b0 [ 33.900548] [] ? file_map_prot_check+0x193/0x310 [ 33.906930] [] ? release_task.part.17+0x1200/0x1200 [ 33.913577] [] ? SyS_mprotect+0x41e/0x640 [ 33.919349] [] ? up_write+0x1a/0x60 [ 33.924601] [] ? SyS_mprotect+0x423/0x640 [ 33.930374] [] do_group_exit+0x111/0x330 [ 33.936060] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.942527] [] SyS_exit_group+0x1d/0x20 [ 33.948139] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.954705] 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 [ 33.981758] RIP [] page_remove_rmap+0x2e/0x260 [ 33.988087] RSP [ 33.991701] CR2: ffffeafff8cc8008 [ 33.995128] ---[ end trace 3f5e6c4a7542645b ]--- [ 33.999853] Kernel panic - not syncing: Fatal exception [ 34.005531] Dumping ftrace buffer: [ 34.009056] (ftrace buffer empty) [ 34.012741] Kernel Offset: disabled [ 34.016340] Rebooting in 86400 seconds..