KASAN: use-after-free Read in __lock

Date	Name	Commit	Repro	Result
2025/09/21	linux-6.1.y (ToT)	363a599da6d9	C	[report] KASAN: use-after-free Read in __lock_sock
2025/08/05	upstream (ToT)	6bcdbd62bd56	C	[report] KASAN: slab-use-after-free Read in __lock_sock
2025/09/21	upstream (ToT)	3b08f56fbbb9	C	Didn't crash

Date

Name

Commit

Repro

Result

2025/09/21

linux-6.1.y (ToT)

363a599da6d9

[report] KASAN: use-after-free Read in __lock_sock

2025/08/05

upstream (ToT)

6bcdbd62bd56

[report] KASAN: slab-use-after-free Read in __lock_sock

2025/09/21

upstream (ToT)

3b08f56fbbb9

Didn't crash

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	KASAN: use-after-free Read in __lock_sock	19				16	303d	369d	0/3	auto-obsoleted due to no activity on 2025/02/17 16:37
linux-4.19	KASAN: use-after-free Read in __lock_sock	19	syz		done	2	2173d	2173d	1/1	fixed on 2019/12/18 04:11
upstream	KASAN: use-after-free Read in __lock_sock sctp	19	syz	done	error	26	1702d	2518d	20/29	fixed on 2022/03/08 16:11
linux-4.19	KASAN: use-after-free Read in __lock_sock (2)	19				1	2076d	2076d	0/1	auto-closed as invalid on 2020/06/01 06:17
linux-4.14	KASAN: use-after-free Read in __lock_sock	19	syz		inconclusive	1	1947d	2067d	0/1	upstream: reported syz repro on 2020/02/11 04:34
linux-5.15	KASAN: use-after-free Read in __lock_sock (2)	19				1	185d	185d	0/3	auto-obsoleted due to no activity on 2025/07/15 20:45
linux-5.15	KASAN: use-after-free Read in __lock_sock (3) origin:upstream	19	C			7	4d00h	78d	0/3	upstream: reported C repro on 2025/07/23 10:25
upstream	KASAN: slab-use-after-free Read in __lock_sock bluetooth	19	C			1	686d	686d	0/29	auto-obsoleted due to no activity on 2024/03/01 14:18
linux-6.6	KASAN: slab-use-after-free Read in __lock_sock origin:upstream missing-backport	19	C		error	6	78d	83d	0/2	upstream: reported C repro on 2025/07/17 21:41
upstream	KASAN: slab-use-after-free Read in __lock_sock (2) bluetooth	19	C			5	465d	480d	0/29	auto-obsoleted due to no activity on 2024/10/08 16:07
upstream	BUG: sleeping function called from invalid context in lock_sock_nested (3) net	19	C	inconclusive	error	153	35d	513d	0/29	upstream: reported C repro on 2024/05/13 12:58

Created	Duration	User	Patch	Repo	Result
2025/09/12 06:26	3h02m	bisect fix		linux-6.1.y	OK (0) job log log

Created

Duration

User

Patch

Repo

Result

2025/09/12 06:26

3h02m

bisect fix

linux-6.1.y

OK (0) job log log

================================================================== BUG: KASAN: use-after-free in __lock_acquire+0xf7/0x7c50 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff8880691c00b0 by task kworker/u4:0/9 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.147-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: kkcmd kcm_tx_work Call Trace: <TASK> dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x200 mm/kasan/report.c:418 kasan_report+0x10b/0x140 mm/kasan/report.c:522 __lock_acquire+0xf7/0x7c50 kernel/locking/lockdep.c:4919 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] __lock_sock+0x152/0x2a0 net/core/sock.c:2916 lock_sock_nested+0x9b/0x100 net/core/sock.c:3493 lock_sock include/net/sock.h:1756 [inline] kcm_tx_work+0x2d/0x180 net/kcm/kcmsock.c:731 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Allocated by task 4641: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3422 sk_prot_alloc+0x57/0x210 net/core/sock.c:2044 sk_alloc+0x36/0x340 net/core/sock.c:2103 kcm_clone net/kcm/kcmsock.c:1640 [inline] kcm_ioctl+0x211/0xff0 net/kcm/kcmsock.c:1685 sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204 sock_ioctl+0x4ed/0x6e0 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 4642: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0xf7/0x290 mm/slub.c:3683 sk_prot_free net/core/sock.c:2084 [inline] __sk_destruct+0x48d/0x630 net/core/sock.c:2172 kcm_release+0x520/0x5b0 net/kcm/kcmsock.c:1860 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1400 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 queue_work_on+0x11d/0x1d0 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] kcm_unattach+0x861/0xe80 net/kcm/kcmsock.c:1549 kcm_unattach_ioctl net/kcm/kcmsock.c:1606 [inline] kcm_ioctl+0x78d/0xff0 net/kcm/kcmsock.c:1673 sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204 sock_ioctl+0x4ed/0x6e0 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 queue_work_on+0x11d/0x1d0 kernel/workqueue.c:1548 kcm_attach net/kcm/kcmsock.c:1429 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1457 [inline] kcm_ioctl+0xe4b/0xff0 net/kcm/kcmsock.c:1663 sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204 sock_ioctl+0x4ed/0x6e0 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880691c0000 which belongs to the cache KCM of size 1720 The buggy address is located 176 bytes inside of 1720-byte region [ffff8880691c0000, ffff8880691c06b8) The buggy address belongs to the physical page: page:ffffea0001a47000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x691c0 head:ffffea0001a47000 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888024240a01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88814cc27640 raw: 0000000000000000 0000000080110011 00000001ffffffff ffff888024240a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4641, tgid 4639 (syz.0.68), ts 135496927542, free_ts 85585135204 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3422 sk_prot_alloc+0x57/0x210 net/core/sock.c:2044 sk_alloc+0x36/0x340 net/core/sock.c:2103 kcm_clone net/kcm/kcmsock.c:1640 [inline] kcm_ioctl+0x211/0xff0 net/kcm/kcmsock.c:1685 sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204 sock_ioctl+0x4ed/0x6e0 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 kasan_depopulate_vmalloc_pte+0x67/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2662 [inline] apply_to_pmd_range mm/memory.c:2706 [inline] apply_to_pud_range mm/memory.c:2742 [inline] apply_to_p4d_range mm/memory.c:2778 [inline] __apply_to_page_range+0x962/0xc80 mm/memory.c:2814 kasan_release_vmalloc+0x93/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0xdb0/0x1900 mm/vmalloc.c:1782 drain_vmap_area_work+0x3c/0xd0 mm/vmalloc.c:1811 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880691bff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880691c0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880691c0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880691c0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880691c0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/08/03 04:50	linux-6.1.y	3594f306da12	7368264b	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: use-after-free Read in __lock_sock

Crashes (1):

Assets (help?)