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BUG: KASAN: user-memory-access in atomic64_inc include/asm-generic/atomic-instrumented.h:1049 [inline]
BUG: KASAN: user-memory-access in atomic_long_inc include/asm-generic/atomic-long.h:160 [inline]
BUG: KASAN: user-memory-access in get_file include/linux/fs.h:986 [inline]
BUG: KASAN: user-memory-access in dup_fd+0x448/0xb80 fs/file.c:341
Write of size 8 at addr 0000004000000070 by task syz-executor.4/517

CPU: 1 PID: 517 Comm: syz-executor.4 Not tainted 5.6.0-rc7-syzkaller #0
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+0xef/0x16e lib/dump_stack.c:118
 __kasan_report.cold+0x75/0x77 mm/kasan/report.c:510
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x152/0x1c0 mm/kasan/generic.c:192
 atomic64_inc include/asm-generic/atomic-instrumented.h:1049 [inline]
 atomic_long_inc include/asm-generic/atomic-long.h:160 [inline]
 get_file include/linux/fs.h:986 [inline]
 dup_fd+0x448/0xb80 fs/file.c:341
 copy_files kernel/fork.c:1466 [inline]
 copy_process+0x1bd5/0x6640 kernel/fork.c:2069
 _do_fork+0x12d/0xfd0 kernel/fork.c:2430
 __do_sys_clone kernel/fork.c:2585 [inline]
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x182/0x210 kernel/fork.c:2566
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ae1a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007ffc793315b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc793315b0 RCX: 000000000045ae1a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc793315f0 R08: 0000000000000001 R09: 00000000013a2940
R10: 00000000013a2c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc79331640
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