WARNING in __kfence

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
d3c12c93-8427-4b95-bc5e-35bc47e80f8d	assessment-security		💥	WARNING in __kfence_free (4)	2026/05/15 06:52	2026/05/15 06:52	2026/05/15 06:53	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: ... truncated to first 200 bytes; open job for full error
4c860957-fb19-4b29-9887-62ec549b27dc	repro		❓	WARNING in __kfence_free (4)	2026/03/07 06:01	2026/03/07 06:01	2026/03/07 06:08	31e9c887f7dc24e04b3ca70d0d54fc34141844b0

Title	Replies (including bot)	Last reply
[syzbot] [kasan?] [mm?] WARNING in __kfence_free (4)	0 (1)	2026/02/24 04:48

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[syzbot] [kasan?] [mm?] WARNING in __kfence_free (4)

0 (1)

2026/02/24 04:48

Kernel	Title	Rank 🛈	Repro	Count	Last	Reported	Patched	Status
upstream	WARNING in __kfence_free (2) kasan mm	-1		1	1265d	1261d	0/29	auto-obsoleted due to no activity on 2023/05/02 22:23
upstream	WARNING in __kfence_free kasan mm	-1		4	1438d	1522d	0/29	auto-obsoleted due to no activity on 2022/11/11 05:48
upstream	WARNING in __kfence_free (3) kasan mm	-1	syz	92	820d	977d	0/29	auto-obsoleted due to no activity on 2024/06/01 06:35

Rank 🛈

upstream

WARNING in __kfence_free (2) kasan mm

-1

1265d

1261d

0/29

auto-obsoleted due to no activity on 2023/05/02 22:23

upstream

WARNING in __kfence_free kasan mm

-1

1438d

1522d

0/29

auto-obsoleted due to no activity on 2022/11/11 05:48

upstream

WARNING in __kfence_free (3) kasan mm

-1

syz

820d

977d

0/29

auto-obsoleted due to no activity on 2024/06/01 06:35

soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality. ------------[ cut here ]------------ WARNING: mm/kfence/core.c:1224 at __kfence_free+0x60/0x100 mm/kfence/core.c:1244, CPU#1: syz-executor/3322 Modules linked in: CPU: 1 UID: 0 PID: 3322 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 81402009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __kfence_free+0x60/0x100 mm/kfence/core.c:1224 lr : kfence_free include/linux/kfence.h:187 [inline] lr : slab_free_hook mm/slub.c:2625 [inline] lr : slab_free mm/slub.c:6124 [inline] lr : kfree+0x3bc/0x3f4 mm/slub.c:6442 sp : ffff800089acbab0 x29: ffff800089acbab0 x28: fbf0000005fa0000 x27: 0000000000000000 x26: 0000000000084008 x25: ffff800082a81000 x24: 0000000000000000 x23: f6f0000003412e00 x22: ffff80008033b784 x21: ffffc1ffc1ffc000 x20: 5eaf80008033b784 x19: fff000007d89df78 x18: 0000000000000002 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 000000000006f7ec x12: 0000000000000001 x11: 0000000000000400 x10: 0000000000006400 x9 : 00000000000000b0 x8 : f3f000000622c45c x7 : 0000000000000024 x6 : 0000000000000024 x5 : 000000000000003c x4 : fff000007d87a000 x3 : ffff800082a81000 x2 : ffff800082a815e0 x1 : f4f0000005ff0c80 x0 : fff000007ff00000 Call trace: __kfence_free+0x60/0x100 mm/kfence/core.c:1244 (P) kfence_free include/linux/kfence.h:187 [inline] slab_free_hook mm/slub.c:2625 [inline] slab_free mm/slub.c:6124 [inline] kfree+0x3bc/0x3f4 mm/slub.c:6442 kvfree+0x3c/0x58 mm/slub.c:6760 xt_free_table_info+0x80/0x90 net/netfilter/x_tables.c:1213 __do_replace+0x250/0x310 net/ipv4/netfilter/ip_tables.c:1084 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline] do_ip6t_set_ctl+0x374/0x418 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x68/0xb0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x90/0xe4 net/ipv6/ipv6_sockglue.c:978 tcp_setsockopt+0x20/0x3c net/ipv4/tcp.c:4217 sock_common_setsockopt+0x1c/0x28 net/core/sock.c:3973 do_sock_setsockopt+0xa4/0x198 net/socket.c:2322 __sys_setsockopt+0x7c/0x100 net/socket.c:2347 __do_sys_setsockopt net/socket.c:2353 [inline] __se_sys_setsockopt net/socket.c:2350 [inline] __arm64_sys_setsockopt+0x28/0x40 net/socket.c:2350 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x104 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0x124 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 ---[ end trace 0000000000000000 ]---

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/20 04:43	upstream	8bf22c33e7a1	17d780d6	.config	console log	report			info	[disk image (non-bootable)] [vmlinux] [kernel image]	ci-qemu2-arm64-mte	WARNING in __kfence_free

Crashes (1):

Assets (help?)