audit: type=1400 audit(3709142708.681:160): avc: denied { ioctl } for pid=10769 comm="syz-executor.5" path="socket:[42860]" dev="sockfs" ino=42860 ioctlcmd=0x8907 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access use of bytesused == 0 is deprecated and will be removed in the future, general protection fault: 0000 [#1] PREEMPT SMP KASAN kobject: 'kvm' (ffff888219fa2dd0): kobject_uevent_env Modules linked in: kobject: 'loop2' (ffff8880a4a74960): fill_kobj_path: path = '/devices/virtual/block/loop2' CPU: 0 PID: 10769 Comm: syz-executor.5 Not tainted 4.14.131 #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880362fe6c0 task.stack: ffff88803ba90000 RIP: 0010:__read_once_size include/linux/compiler.h:186 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline] RIP: 0010:refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179 RSP: 0018:ffff88803ba97b98 EFLAGS: 00010202 kobject: 'kvm' (ffff888219fa2dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' RAX: dffffc0000000000 RBX: ffff88809c15d040 RCX: ffffffff8424d2c0 RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001 RBP: ffff88803ba97bc0 R08: 0000000093c1e6bb R09: ffff8880362fef88 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020 R13: 0000000000000001 R14: ffff88809c15d054 R15: 0000000000000000 FS: 0000000000cc5940(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31623000 CR3: 0000000094a1a000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: refcount_dec_and_test+0x1b/0x20 lib/refcount.c:212 vb2_vmalloc_put+0x18/0x70 drivers/media/v4l2-core/videobuf2-vmalloc.c:68 kobject: 'loop3' (ffff8880a4ae1260): kobject_uevent_env __vb2_buf_mem_free+0x103/0x1e0 drivers/media/v4l2-core/videobuf2-core.c:240 __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:409 [inline] __vb2_queue_free+0x634/0x7d0 drivers/media/v4l2-core/videobuf2-core.c:454 use the actual size instead. vb2_core_queue_release+0x64/0x80 drivers/media/v4l2-core/videobuf2-core.c:2043 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline] _vb2_fop_release+0x1cf/0x2a0 drivers/media/v4l2-core/videobuf2-v4l2.c:840 vb2_fop_release+0x75/0xc0 drivers/media/v4l2-core/videobuf2-v4l2.c:854 vivid_fop_release+0x180/0x3f0 drivers/media/platform/vivid/vivid-core.c:486 kobject: 'loop3' (ffff8880a4ae1260): fill_kobj_path: path = '/devices/virtual/block/loop3' v4l2_release+0xf9/0x190 drivers/media/v4l2-core/v4l2-dev.c:446 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 kobject: 'kvm' (ffff888219fa2dd0): kobject_uevent_env RIP: 0033:0x413201 RSP: 002b:00007ffd8ddf7990 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413201 RDX: 0000001b31420000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf kobject: 'loop1' (ffff8880a4a1af60): kobject_uevent_env R10: 00007ffd8ddf7a70 R11: 0000000000000293 R12: 0000000000762f60 kobject: 'loop1' (ffff8880a4a1af60): fill_kobj_path: path = '/devices/virtual/block/loop1' R13: 0000000000046999 R14: 00000000000469c6 R15: ffffffffffffffff Code: 55 48 89 e5 41 56 41 55 41 89 fd 41 54 49 89 f4 53 48 83 ec 08 e8 26 b4 85 fe 4c 89 e2 48 b8 kobject: 'kvm' (ffff888219fa2dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RIP: __read_once_size include/linux/compiler.h:186 [inline] RSP: ffff88803ba97b98 RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff88803ba97b98 RIP: refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179 RSP: ffff88803ba97b98 kobject: 'kvm' (ffff888219fa2dd0): kobject_uevent_env FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 kobject: 'loop0' (ffff8880a49a23e0): kobject_uevent_env CPU: 0 PID: 10801 Comm: syz-executor.0 Tainted: G D 4.14.131 #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x2d7/0x780 mm/slab.c:3550 kobject: 'loop0' (ffff8880a49a23e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kmem_cache_zalloc include/linux/slab.h:651 [inline] file_alloc_security security/selinux/hooks.c:368 [inline] selinux_file_alloc_security+0xb4/0x190 security/selinux/hooks.c:3475 kobject: 'kvm' (ffff888219fa2dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' security_file_alloc+0x6d/0xa0 security/security.c:874 get_empty_filp+0x130/0x3b0 fs/file_table.c:129 kobject: 'kvm' (ffff888219fa2dd0): kobject_uevent_env path_openat+0x8f/0x3f70 fs/namei.c:3542 kobject: 'kvm' (ffff888219fa2dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (ffff888219fa2dd0): kobject_uevent_env kobject: 'kvm' (ffff888219fa2dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' do_filp_open+0x18e/0x250 fs/namei.c:3600 kobject: 'loop1' (ffff8880a4a1af60): kobject_uevent_env kobject: 'loop1' (ffff8880a4a1af60): fill_kobj_path: path = '/devices/virtual/block/loop1' do_sys_open+0x2c5/0x430 fs/open.c:1065 SYSC_open fs/open.c:1083 [inline] SyS_open fs/open.c:1078 [inline] SYSC_creat fs/open.c:1123 [inline] SyS_creat+0x27/0x30 fs/open.c:1121 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 ---[ end trace 4c6f070c6f582bb7 ]--- entry_SYSCALL_64_after_hwframe+0x42/0xb7