program syz-executor2 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 ================================================================== BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline] BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95 [inline] BUG: KASAN: use-after-free in _free_event+0x49a/0x15e0 kernel/events/core.c:4451 Write of size 4 at addr ffff880184e2a5e0 by task syz-executor0/9029 CPU: 0 PID: 9029 Comm: syz-executor0 Not tainted 4.19.0-rc2-next-20180904+ #55 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 netlink: 'syz-executor3': attribute type 21 has an invalid length. atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline] put_task_struct include/linux/sched/task.h:95 [inline] _free_event+0x49a/0x15e0 kernel/events/core.c:4451 netlink: 'syz-executor3': attribute type 1 has an invalid length. free_event+0xb4/0x180 kernel/events/core.c:4472 perf_event_release_kernel+0x7d5/0xfc0 kernel/events/core.c:4633 perf_release+0x37/0x50 kernel/events/core.c:4647 __fput+0x3c1/0xa80 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1ae4/0x26e0 kernel/exit.c:867 do_group_exit+0x177/0x440 kernel/exit.c:970 get_signal+0x851/0x18e0 kernel/signal.c:2513 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197 retint_user+0x8/0x18 RIP: 0033: (null) Code: Bad RIP value. RSP: 002b:00000000200000c8 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f58c33d86d4 RCX: 00000000004572a9 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00000000009300a0 R08: 00000000200000c0 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cbd68 R14: 00000000004c3645 R15: 0000000000000000 Allocated by task 9025: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc_node+0x144/0x720 mm/slab.c:3644 alloc_task_struct_node kernel/fork.c:158 [inline] dup_task_struct kernel/fork.c:803 [inline] copy_process+0x1dd0/0x7af0 kernel/fork.c:1708 _do_fork+0x1ca/0x1170 kernel/fork.c:2169 __do_sys_clone kernel/fork.c:2276 [inline] __se_sys_clone kernel/fork.c:2270 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2270 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9025: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x280 mm/slab.c:3756 free_task_struct kernel/fork.c:163 [inline] free_task+0x16e/0x1f0 kernel/fork.c:417 copy_process+0x1b21/0x7af0 kernel/fork.c:2101 _do_fork+0x1ca/0x1170 kernel/fork.c:2169 __do_sys_clone kernel/fork.c:2276 [inline] __se_sys_clone kernel/fork.c:2270 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2270 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff880184e2a5c0 which belongs to the cache task_struct(17:syz0) of size 6016 The buggy address is located 32 bytes inside of 6016-byte region [ffff880184e2a5c0, ffff880184e2bd40) The buggy address belongs to the page: page:ffffea0006138a80 count:1 mapcount:0 mapping:ffff8801c0ef6300 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea000614c708 ffff8801cf0ddb48 ffff8801c0ef6300 raw: 0000000000000000 ffff880184e2a5c0 0000000100000001 ffff880181644440 page dumped because: kasan: bad access detected page->mem_cgroup:ffff880181644440 Memory state around the buggy address: ffff880184e2a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880184e2a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff880184e2a580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff880184e2a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880184e2a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================