audit: type=1400 audit(1540668607.222:120792): avc:  denied  { dac_override } for  pid=2096 comm="syz-executor2" capability=1  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
------------[ cut here ]------------
WARNING: CPU: 1 PID: 29852 at arch/x86/mm/pat.c:1019 untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 29852 Comm: syz-executor5 Not tainted 4.9.135+ #15
 ffff8801ade87468 ffffffff81b36bf9 ffffffff82a38ba0 00000000ffffffff
 0000000000000000 0000000000000001 00000000000003fb ffff8801ade87528
 ffffffff813f6aa5 0000000041b58ab3 ffffffff82e2a6e3 ffffffff813f68e6
Call Trace:
 [<ffffffff81b36bf9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36bf9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f6aa5>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f6d74>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff810dbe2c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff810be922>] untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
 [<ffffffff8149a3f1>] unmap_single_vma+0x141/0x170 mm/memory.c:1315
 [<ffffffff8149a5e7>] zap_page_range_single+0x1c7/0x280 mm/memory.c:1416
 [<ffffffff8149a9b3>] unmap_mapping_range_vma mm/memory.c:2446 [inline]
 [<ffffffff8149a9b3>] unmap_mapping_range_tree mm/memory.c:2467 [inline]
 [<ffffffff8149a9b3>] unmap_mapping_range+0x233/0x2d0 mm/memory.c:2514
 [<ffffffff81441934>] truncate_pagecache+0x54/0x90 mm/truncate.c:705
 [<ffffffff814419bc>] truncate_setsize+0x4c/0x70 mm/truncate.c:731
 [<ffffffff815898ca>] simple_setattr+0xca/0xf0 fs/libfs.c:408
 [<ffffffff81568437>] notify_change2+0xc37/0xe00 fs/attr.c:315
 [<ffffffff8150337d>] do_truncate2+0x13d/0x1f0 fs/open.c:63
 [<ffffffff8153cb76>] handle_truncate fs/namei.c:2990 [inline]
 [<ffffffff8153cb76>] do_last fs/namei.c:3419 [inline]
 [<ffffffff8153cb76>] path_openat+0xb86/0x2790 fs/namei.c:3534
 [<ffffffff81541607>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8150616d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff816187fd>] C_SYSC_openat fs/compat.c:1090 [inline]
 [<ffffffff816187fd>] compat_SyS_openat+0x2d/0x40 fs/compat.c:1088
 [<ffffffff81006311>] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline]
 [<ffffffff81006311>] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390
 [<ffffffff8280c160>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Kernel Offset: disabled
Rebooting in 86400 seconds..