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: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bf/0x39f kernel/panic.c:179 [] __warn.cold.9+0xc1/0x17f kernel/panic.c:542 [] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [] untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019 [] unmap_single_vma+0x141/0x170 mm/memory.c:1315 [] zap_page_range_single+0x1c7/0x280 mm/memory.c:1416 [] unmap_mapping_range_vma mm/memory.c:2446 [inline] [] unmap_mapping_range_tree mm/memory.c:2467 [inline] [] unmap_mapping_range+0x233/0x2d0 mm/memory.c:2514 [] truncate_pagecache+0x54/0x90 mm/truncate.c:705 [] truncate_setsize+0x4c/0x70 mm/truncate.c:731 [] simple_setattr+0xca/0xf0 fs/libfs.c:408 [] notify_change2+0xc37/0xe00 fs/attr.c:315 [] do_truncate2+0x13d/0x1f0 fs/open.c:63 [] handle_truncate fs/namei.c:2990 [inline] [] do_last fs/namei.c:3419 [inline] [] path_openat+0xb86/0x2790 fs/namei.c:3534 [] do_filp_open+0x197/0x270 fs/namei.c:3568 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 [] C_SYSC_openat fs/compat.c:1090 [inline] [] compat_SyS_openat+0x2d/0x40 fs/compat.c:1088 [] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] [] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Kernel Offset: disabled Rebooting in 86400 seconds..