linux-kernel - RE: [syzbot] WARNING in __kfence

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Message-ID: <PH0PR11MB5880BDCCB36A273368245C87DAF79@PH0PR11MB5880.namprd11.prod.outlook.com>
Date:   Fri, 22 Apr 2022 06:06:43 +0000
From:   "Zhang, Qiang1" <qiang1.zhang@...el.com>
To:     syzbot <syzbot+ffe71f1ff7f8061bcc98@...kaller.appspotmail.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "elver@...gle.com" <elver@...gle.com>,
        "glider@...gle.com" <glider@...gle.com>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>
Subject: RE: [syzbot] WARNING in __kfence_free

Cc: Muchun


Hello,

syzbot found the following issue on:

HEAD commit:    559089e0a93d vmalloc: replace VM_NO_HUGE_VMAP with VM_ALLO..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10853220f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2e1f9b9947966f42
dashboard link: https://syzkaller.appspot.com/bug?extid=ffe71f1ff7f8061bcc98
compiler:       aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

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: syzbot+ffe71f1ff7f8061bcc98@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 2216 at mm/kfence/core.c:1022 __kfence_free+0x84/0xc0 mm/kfence/core.c:1022 Modules linked in:
CPU: 0 PID: 2216 Comm: syz-executor.0 Not tainted 5.18.0-rc3-syzkaller-00007-g559089e0a93d #0 Hardware name: linux,dummy-virt (DT)
pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __kfence_free+0x84/0xc0 mm/kfence/core.c:1022 lr : kfence_free include/linux/kfence.h:186 [inline] lr : __slab_free+0x2e4/0x4d4 mm/slub.c:3315 sp : ffff80000a9fb980
x29: ffff80000a9fb980 x28: ffff80000a280040 x27: f2ff000002c01c00
x26: ffff00007b694040 x25: ffff00007b694000 x24: 0000000000000001
x23: ffff00007b694000 x22: ffff00007b694000 x21: f2ff000002c01c00
x20: ffff80000821accc x19: fffffc0001eda500 x18: 0000000000000002
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000001 x13: 000000000005eb7f x12: f7ff000007a08024
x11: f7ff000007a08000 x10: 0000000000000000 x9 : 0000000000000014
x8 : 0000000000000001 x7 : 0000000000094000 x6 : ffff80000a280000
x5 : ffff80000821accc x4 : ffff80000a50e078 x3 : ffff80000a280348
x2 : f0ff00001e325c00 x1 : ffff80000a522b40 x0 : ffff00007b694000 Call trace:
 __kfence_free+0x84/0xc0 mm/kfence/core.c:1022  kfence_free include/linux/kfence.h:186 [inline]
 __slab_free+0x2e4/0x4d4 mm/slub.c:3315
 do_slab_free mm/slub.c:3498 [inline]
 slab_free mm/slub.c:3511 [inline]
 kfree+0x320/0x37c mm/slub.c:4552
 kvfree+0x3c/0x50 mm/util.c:615
 xt_free_table_info+0x78/0x90 net/netfilter/x_tables.c:1212
 __do_replace+0x240/0x330 net/ipv6/netfilter/ip6_tables.c:1104
 do_replace net/ipv6/netfilter/ip6_tables.c:1157 [inline]
 do_ip6t_set_ctl+0x374/0x4e0 net/ipv6/netfilter/ip6_tables.c:1639
 nf_setsockopt+0x68/0x94 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0xa8/0x220 net/ipv6/ipv6_sockglue.c:1026
 tcp_setsockopt+0x38/0xdb4 net/ipv4/tcp.c:3696
 sock_common_setsockopt+0x1c/0x30 net/core/sock.c:3505
 __sys_setsockopt+0xa0/0x1c0 net/socket.c:2180  __do_sys_setsockopt net/socket.c:2191 [inline]  __se_sys_setsockopt net/socket.c:2188 [inline]
 __arm64_sys_setsockopt+0x2c/0x40 net/socket.c:2188  __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52  el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x6c/0x84 arch/arm64/kernel/syscall.c:181
 el0_svc+0x44/0xb0 arch/arm64/kernel/entry-common.c:616
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:634
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581 ---[ end trace 0000000000000000 ]---


---
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