[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.935058] 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: [ 26.593165] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.121073] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.832753] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 28.023347] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 33.664281] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.752569] BUG: unable to handle kernel paging request at ffffeafffd438008 [ 33.759910] IP: [] page_remove_rmap+0x2e/0x260 [ 33.766160] PGD 0 [ 33.768399] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.773392] Dumping ftrace buffer: [ 33.776902] (ftrace buffer empty) [ 33.780583] Modules linked in: [ 33.783874] CPU: 1 PID: 3858 Comm: syz-executor926 Not tainted 4.4.149-gf76bdbd #82 [ 33.791642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.800970] task: ffff8801c674b000 task.stack: ffff8801d9298000 [ 33.807000] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.815675] RSP: 0018:ffff8801d929f9c0 EFLAGS: 00010246 [ 33.821093] RAX: dffffc0000000000 RBX: ffffeafffd438000 RCX: 0000000000000000 [ 33.828341] RDX: 1ffffd5fffa87001 RSI: ffffffff814bc8bf RDI: ffffeafffd438008 [ 33.835595] RBP: ffff8801d929f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.842839] R10: 0000000000000001 R11: ffff8801c674b000 R12: 0000000000000001 [ 33.850088] R13: 1ffff1003b253f3e R14: ffff8800b54ff800 R15: ffffeafffd438000 [ 33.857335] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.865533] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.871388] CR2: ffffeafffd438008 CR3: 00000000bb03e000 CR4: 00000000001606f0 [ 33.878632] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.885874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.893116] Stack: [ 33.895239] ffff8801d929fc50 0000000000000001 ffff8801d929fa78 ffffffff8150a443 [ 33.903252] 00003fff50e001e0 00003fff50e001e0 0000000041b58ab3 ffffffff841ef837 [ 33.911241] ffffffff8150a240 00000000000004f0 ffff8801ccf37420 ffff8801d929fa40 [ 33.919224] Call Trace: [ 33.921791] [] zap_huge_pmd+0x203/0x510 [ 33.927389] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.933942] [] unmap_single_vma+0xea3/0x1240 [ 33.939973] [] ? vm_normal_page+0x230/0x230 [ 33.945923] [] ? __put_single_page+0x60/0x60 [ 33.951959] [] unmap_vmas+0x81/0xd0 [ 33.957277] [] exit_mmap+0x1c9/0x3a0 [ 33.962635] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.969101] [] ? kmem_cache_free+0x2b4/0x340 [ 33.975135] [] mmput+0xf8/0x2d0 [ 33.980043] [] do_exit+0x8d8/0x26b0 [ 33.985305] [] ? file_map_prot_check+0x193/0x310 [ 33.991691] [] ? release_task.part.17+0x1200/0x1200 [ 33.998333] [] ? SyS_mprotect+0x41e/0x640 [ 34.004107] [] ? up_write+0x1a/0x60 [ 34.009358] [] ? SyS_mprotect+0x423/0x640 [ 34.015134] [] do_group_exit+0x111/0x330 [ 34.020824] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.027289] [] SyS_exit_group+0x1d/0x20 [ 34.032900] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.039449] 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 [ 34.066381] RIP [] page_remove_rmap+0x2e/0x260 [ 34.072707] RSP [ 34.076313] CR2: ffffeafffd438008 [ 34.079743] ---[ end trace 778f4e213ba7f1b0 ]--- [ 34.084471] Kernel panic - not syncing: Fatal exception [ 34.090138] Dumping ftrace buffer: [ 34.093655] (ftrace buffer empty) [ 34.097343] Kernel Offset: disabled [ 34.100943] Rebooting in 86400 seconds..