[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.578927] 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: [ 27.673583] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.963064] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.552075] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 28.735202] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. [ 34.259118] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) executing program [ 34.351972] BUG: unable to handle kernel paging request at ffffeafffd478008 [ 34.359346] IP: [] page_remove_rmap+0x2e/0x260 [ 34.365609] PGD 0 [ 34.367859] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.372832] Dumping ftrace buffer: [ 34.376347] (ftrace buffer empty) [ 34.380064] Modules linked in: [ 34.383358] CPU: 0 PID: 3797 Comm: syz-executor341 Not tainted 4.4.150-g5541782 #83 [ 34.391141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.400477] task: ffff8801ca5d4800 task.stack: ffff8800af318000 [ 34.406510] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.415206] RSP: 0018:ffff8800af31f9c0 EFLAGS: 00010246 [ 34.420643] RAX: dffffc0000000000 RBX: ffffeafffd478000 RCX: 0000000000000000 [ 34.427892] RDX: 1ffffd5fffa8f001 RSI: ffffffff814bceaf RDI: ffffeafffd478008 [ 34.435138] RBP: ffff8800af31f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.442391] R10: 0000000000000001 R11: ffff8801ca5d4800 R12: 0000000000000001 [ 34.449637] R13: 1ffff10015e63f3e R14: ffff8800b3d7d800 R15: ffffeafffd478000 [ 34.456885] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.465085] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.470941] CR2: ffffeafffd478008 CR3: 00000000b4bf8000 CR4: 00000000001606f0 [ 34.478204] Stack: [ 34.480336] ffff8800af31fc50 0000000000000001 ffff8800af31fa78 ffffffff8150ad13 [ 34.488338] 00003fff51e001e0 00003fff51e001e0 0000000041b58ab3 ffffffff841ef837 [ 34.496331] ffffffff8150ab10 00000000000004f0 ffff8800b5b900b0 ffff8800af31fa40 [ 34.504321] Call Trace: [ 34.506887] [] zap_huge_pmd+0x203/0x510 [ 34.512490] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.519043] [] unmap_single_vma+0xea3/0x1240 [ 34.525075] [] ? vm_normal_page+0x280/0x280 [ 34.531022] [] ? __put_single_page+0x60/0x60 [ 34.537072] [] unmap_vmas+0x81/0xd0 [ 34.542331] [] exit_mmap+0x1c9/0x3a0 [ 34.547672] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.554143] [] ? up_write+0x1a/0x60 [ 34.559397] [] mmput+0xf8/0x2d0 [ 34.564306] [] do_exit+0x8d8/0x26b0 [ 34.569566] [] ? file_map_prot_check+0x193/0x310 [ 34.575952] [] ? release_task.part.17+0x1200/0x1200 [ 34.582595] [] ? SyS_mprotect+0x41e/0x640 [ 34.588385] [] ? up_write+0x1a/0x60 [ 34.593640] [] ? SyS_mprotect+0x423/0x640 [ 34.599431] [] do_group_exit+0x111/0x330 [ 34.605126] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.611599] [] SyS_exit_group+0x1d/0x20 [ 34.617200] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.623763] 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 [ 34.650805] RIP [] page_remove_rmap+0x2e/0x260 [ 34.657155] RSP [ 34.660757] CR2: ffffeafffd478008 [ 34.664186] ---[ end trace cf0386dd5957dbae ]--- [ 34.668919] Kernel panic - not syncing: Fatal exception [ 34.674584] Dumping ftrace buffer: [ 34.678104] (ftrace buffer empty) [ 34.681789] Kernel Offset: disabled [ 34.685391] Rebooting in 86400 seconds..