KASAN: invalid-free in f_uac2_opts_p_srate_store

Status: upstream: reported C repro on 2026/08/01 22:27
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+0a9828a0e2c091a9ca50@syzkaller.appspotmail.com
First crash: 97d, last: 9h39m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/08/16 lts (merge base) 228da13e907e C [report] KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/16 upstream (ToT) 3eb40771c00a C [report] KASAN: invalid-free in f_uac2_opts_p_srate_store
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: invalid-free in f_uac2_opts_p_srate_store prio:normal usb 24 syz, C error done 156 70d 100d 0/29 upstream: reported C repro on 2026/07/30 00:09
android-6-12 KASAN: invalid-free in f_uac2_opts_p_srate_store origin:lts 24 syz, C 8 18d 101d 0/1 premoderation: reported C repro on 2026/07/28 00:18
linux-6.1 KASAN: invalid-free in f_uac2_opts_p_srate_store 24 syz, C 6 45d 85d 0/3 upstream: reported C repro on 2026/08/13 09:55
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/11/06 14:13 13m retest repro android14-6.1 report job log log
2026/11/06 14:13 7m retest repro android14-6.1 report job log log
2026/10/18 13:05 18m retest repro android14-6.1 report job log log
2026/10/18 13:05 16m retest repro android14-6.1 report job log log
2026/10/18 13:05 17m retest repro android14-6.1 report job log log
2026/10/18 13:05 22m retest repro android14-6.1 report job log log
2026/10/18 13:05 15m retest repro android14-6.1 report job log log

Sample crash report:
==================================================================
BUG: KASAN: invalid-free in slab_free mm/slub.c:3712 [inline]
BUG: KASAN: invalid-free in __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
Free of addr ffff88810d861601 by task syz-executor124/305

CPU: 1 PID: 305 Comm: syz-executor124 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report_invalid_free+0xd5/0xf0 mm/kasan/report.c:489
 ____kasan_slab_free+0x14f/0x180 mm/kasan/common.c:-1
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 f_uac2_opts_p_srate_store+0x220/0x2a0 drivers/usb/gadget/function/f_uac2.c:2078
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x323/0x410 fs/configfs/file.c:229
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x65a/0xb30 fs/read_write.c:861
 vfs_writev+0x339/0x5f0 fs/read_write.c:934
 do_pwritev fs/read_write.c:1031 [inline]
 __do_sys_pwritev fs/read_write.c:1078 [inline]
 __se_sys_pwritev fs/read_write.c:1073 [inline]
 __x64_sys_pwritev+0x19b/0x2b0 fs/read_write.c:1073
 x64_sys_call+0x695/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:297
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f80589e1cf9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe52d79b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: d7ceab0f2931992c RCX: 00007f80589e1cf9
RDX: 0000000000000001 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000006 R09: 00007ffe52d79c58
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffe52d79c48
R13: 0000000000000002 R14: 00007f8058a72ca0 R15: 0000000000000002
 </TASK>

Allocated by task 305:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958
 kstrdup+0x3b/0x80 mm/util.c:66
 f_uac2_opts_p_srate_store+0x11a/0x2a0 drivers/usb/gadget/function/f_uac2.c:2078
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x323/0x410 fs/configfs/file.c:229
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x65a/0xb30 fs/read_write.c:861
 vfs_writev+0x339/0x5f0 fs/read_write.c:934
 do_pwritev fs/read_write.c:1031 [inline]
 __do_sys_pwritev fs/read_write.c:1078 [inline]
 __se_sys_pwritev fs/read_write.c:1073 [inline]
 __x64_sys_pwritev+0x19b/0x2b0 fs/read_write.c:1073
 x64_sys_call+0x695/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:297
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88810d861600
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 1 bytes inside of
 16-byte region [ffff88810d861600, ffff88810d861610)

The buggy address belongs to the physical page:
page:ffffea0004361840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d861
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004361500 dead000000000002 ffff888100042480
raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2655920809, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kvasprintf+0xe8/0x1a0 lib/kasprintf.c:25
 kvasprintf_const+0xf2/0x240 lib/kasprintf.c:49
 kobject_set_name_vargs+0x61/0x110 lib/kobject.c:265
 dev_set_name+0xdf/0x130 drivers/base/core.c:3486
 scsi_alloc_target+0x205/0xbe0 drivers/scsi/scsi_scan.c:510
 __scsi_scan_target+0x168/0xc20 drivers/scsi/scsi_scan.c:1704
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810d861500: fb fb fc fc fa fb fc fc fb fb fc fc fa fb fc fc
 ffff88810d861580: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
>ffff88810d861600: 00 02 fc fc fa fb fc fc fa fb fc fc fb fb fc fc
                   ^
 ffff88810d861680: fa fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
 ffff88810d861700: fb fb fc fc fa fb fc fc fa fb fc fc fb fb fc fc
==================================================================

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/18 14:04 android14-6.1 48e3cd973485 432c0077 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/10/01 21:35 android14-6.1 6612ef9d0b09 f5cdae2f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/21 14:38 android14-6.1 92668decd5e0 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/20 23:26 android14-6.1 92668decd5e0 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/20 20:03 android14-6.1 92668decd5e0 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/01 23:18 android14-6.1 92668decd5e0 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/01 22:48 android14-6.1 92668decd5e0 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/01 22:16 android14-6.1 92668decd5e0 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/15 23:21 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/14 02:54 android14-6.1 92668decd5e0 b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
2026/08/01 21:40 android14-6.1 92668decd5e0 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: invalid-free in f_uac2_opts_p_srate_store
* Struck through repros no longer work on HEAD.