Hello,
syzbot found the following issue on:
HEAD commit: 7a7fd0de Merge branch 'kmap-conversion-for-5.12' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=164a74dad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=779a2568b654c1c6
dashboard link: https://syzkaller.appspot.com/bug?extid=521772a90166b3fca21f
compiler: Debian clang version 11.0.1-2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: <redacted>
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in cipso_v4_doi_putdef+0x2d/0x190 net/ipv4/cipso_ipv4.c:586
Write of size 4 at addr ffff8880179ecb18 by task syz-executor.5/20110
CPU: 0 PID: 20110 Comm: syz-executor.5 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x125/0x19e lib/dump_stack.c:120
print_address_description+0x5f/0x3a0 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report+0x15e/0x210 mm/kasan/report.c:416
check_region_inline mm/kasan/generic.c:135 [inline]
kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:186
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline]
__refcount_sub_and_test include/linux/refcount.h:272 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
98 more lines
ffff8880179ecb00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff8880179ecb80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff8880179ecc00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
==================================================================
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