* [moderation/CI] Re: zram: fix early release of global cdict/ddict in per-CPU error path
@ 2026-07-29 10:58 syzbot ci
2026-07-29 12:11 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-07-29 10:58 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v2] zram: fix early release of global cdict/ddict in per-CPU error path
https://lore.kernel.org/all/20260728092935.31139-1-haoqinhuang7@gmail.com
* [PATCH v2 1/5] zram: fix early release of global cdict/ddict in per-CPU error path
* [PATCH v2 2/5] zram: make dict update in comp_params_store() atomic
* [PATCH v2 3/5] zstd: move ZSTD_MAX_CLEVEL to zstd_lib.h
* [PATCH v2 4/5] zram: add per-backend caps and validate parameters early
* [PATCH v2 5/5] zram: reset per-priority params when changing algorithm before init
and found the following issue:
KASAN: slab-use-after-free Read in event_handler
Full report is available here:
https://ci.syzbot.org/series/e2672818-2e9a-4685-8cee-6e5202cb0372
***
KASAN: slab-use-after-free Read in event_handler
tree: axboe
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux.git
base: 923b1b5a3a5cc642172d8cf8c6097ad1169b6217
arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
config: https://ci.syzbot.org/builds/444dc77b-c272-46a7-ac65-9b594a954b56/config
syz repro: https://ci.syzbot.org/findings/6c520622-cfcc-490d-88c4-b7f28288e76c/syz_repro
vhci_hcd vhci_hcd.0: release socket
vhci_hcd vhci_hcd.0: disconnect device
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
Read of size 1 at addr ffff88816d3a8478 by task kworker/u8:5/5796
CPU: 1 UID: 0 PID: 5796 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: usbip_event event_handler
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
unset_event drivers/usb/usbip/usbip_event.c:35 [inline]
event_handler+0x2b0/0x4b0 drivers/usb/usbip/usbip_event.c:80
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 1:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5362 [inline]
__kmalloc_noprof+0x375/0x720 mm/slub.c:5387
_kmalloc_noprof include/linux/slab.h:973 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
__usb_create_hcd+0x67/0x900 drivers/usb/core/hcd.c:2566
vhci_hcd_probe+0x104/0x3e0 drivers/usb/usbip/vhci_hcd.c:1378
platform_probe+0xf9/0x190 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
__device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c4/0x450 drivers/base/dd.c:1098
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
device_add+0x7d7/0xb80 drivers/base/core.c:3772
platform_device_add+0x4bd/0x860 drivers/base/platform.c:762
platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902
vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557
do_one_initcall+0x250/0x870 init/main.c:1347
do_initcall_level+0x10a/0x1a0 init/main.c:1409
do_initcalls+0x59/0xa0 init/main.c:1425
kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
kernel_init+0x1d/0x1d0 init/main.c:1548
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 5870:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2705 [inline]
slab_free mm/slub.c:6405 [inline]
kfree+0x1c5/0x640 mm/slub.c:6720
vhci_hcd_remove+0xe4/0x110 drivers/usb/usbip/vhci_hcd.c:1434
device_remove drivers/base/dd.c:616 [inline]
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244
kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
insert_work+0x3d/0x330 kernel/workqueue.c:2226
__queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401
queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline]
unlink1+0x344/0x3e0 drivers/usb/core/hcd.c:1580
usb_hcd_unlink_urb+0xe6/0x1e0 drivers/usb/core/hcd.c:1617
usb_kill_urb+0x10b/0x2f0 drivers/usb/core/urb.c:716
hub_quiesce+0x211/0x330 drivers/usb/core/hub.c:1412
hub_suspend+0x904/0xad0 drivers/usb/core/hub.c:4008
usb_suspend_interface drivers/usb/core/driver.c:1323 [inline]
usb_suspend_both+0x285/0x1040 drivers/usb/core/driver.c:1446
usb_runtime_suspend+0x58/0x110 drivers/usb/core/driver.c:2000
__rpm_callback+0x2c7/0x950 drivers/base/power/runtime.c:406
rpm_callback drivers/base/power/runtime.c:460 [inline]
rpm_suspend+0x8a0/0x17b0 drivers/base/power/runtime.c:698
__pm_runtime_suspend+0x12f/0x1a0 drivers/base/power/runtime.c:1167
pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline]
usb_new_device+0xadf/0x1620 drivers/usb/core/hub.c:2727
register_root_hub+0x250/0x5c0 drivers/usb/core/hcd.c:990
usb_add_hcd+0xac7/0xf80 drivers/usb/core/hcd.c:2987
vhci_hcd_probe+0x141/0x3e0 drivers/usb/usbip/vhci_hcd.c:1388
platform_probe+0xf9/0x190 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x254/0xae0 drivers/base/dd.c:706
__driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
__device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c4/0x450 drivers/base/dd.c:1098
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
device_add+0x7d7/0xb80 drivers/base/core.c:3772
platform_device_add+0x4bd/0x860 drivers/base/platform.c:762
platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902
vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557
do_one_initcall+0x250/0x870 init/main.c:1347
do_initcall_level+0x10a/0x1a0 init/main.c:1409
do_initcalls+0x59/0xa0 init/main.c:1425
kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
kernel_init+0x1d/0x1d0 init/main.c:1548
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
insert_work+0x3d/0x330 kernel/workqueue.c:2226
__queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401
queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
rh_call_control drivers/usb/core/hcd.c:706 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
usb_hcd_submit_urb+0xa3b/0x1b60 drivers/usb/core/hcd.c:1538
usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62
usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167
get_port_status drivers/usb/core/hub.c:607 [inline]
hub_ext_port_status+0x114/0x810 drivers/usb/core/hub.c:624
usb_hub_port_status drivers/usb/core/hub.c:674 [inline]
hub_activate+0x740/0x1b20 drivers/usb/core/hub.c:1185
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88816d3a8000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 1144 bytes inside of
freed 8192-byte region [ffff88816d3a8000, ffff88816d3aa000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16d3a8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000
head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 057ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 15263763575, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3294 [inline]
allocate_slab+0x79/0x5e0 mm/slub.c:3408
new_slab mm/slub.c:3454 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7338
refill_sheaf mm/slub.c:2832 [inline]
__pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703
alloc_from_pcs mm/slub.c:4801 [inline]
slab_alloc_node mm/slub.c:4933 [inline]
__kmalloc_cache_noprof+0x3a7/0x660 mm/slub.c:5511
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
dummy_hcd_init+0x3e2/0xd00 drivers/usb/gadget/udc/dummy_hcd.c:2836
do_one_initcall+0x250/0x870 init/main.c:1347
do_initcall_level+0x10a/0x1a0 init/main.c:1409
do_initcalls+0x59/0xa0 init/main.c:1425
kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
kernel_init+0x1d/0x1d0 init/main.c:1548
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing
Memory state around the buggy address:
ffff88816d3a8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88816d3a8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88816d3a8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88816d3a8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88816d3a8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).
The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.
The email will later be sent to:
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If the report looks fine to you, reply with:
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If the report is a false positive, reply with
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: zram: fix early release of global cdict/ddict in per-CPU error path
2026-07-29 10:58 [moderation/CI] Re: zram: fix early release of global cdict/ddict in per-CPU error path syzbot ci
@ 2026-07-29 12:11 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2026-07-29 12:11 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
No, not related.
#syz invalid
On Wed, Jul 29, 2026 at 12:58 PM syzbot ci
<syzbot+ci163dda578633ce51@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v2] zram: fix early release of global cdict/ddict in per-CPU error path
> https://lore.kernel.org/all/20260728092935.31139-1-haoqinhuang7@gmail.com
> * [PATCH v2 1/5] zram: fix early release of global cdict/ddict in per-CPU error path
> * [PATCH v2 2/5] zram: make dict update in comp_params_store() atomic
> * [PATCH v2 3/5] zstd: move ZSTD_MAX_CLEVEL to zstd_lib.h
> * [PATCH v2 4/5] zram: add per-backend caps and validate parameters early
> * [PATCH v2 5/5] zram: reset per-priority params when changing algorithm before init
>
> and found the following issue:
> KASAN: slab-use-after-free Read in event_handler
>
> Full report is available here:
> https://ci.syzbot.org/series/e2672818-2e9a-4685-8cee-6e5202cb0372
>
> ***
>
> KASAN: slab-use-after-free Read in event_handler
>
> tree: axboe
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux.git
> base: 923b1b5a3a5cc642172d8cf8c6097ad1169b6217
> arch: amd64
> compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
> config: https://ci.syzbot.org/builds/444dc77b-c272-46a7-ac65-9b594a954b56/config
> syz repro: https://ci.syzbot.org/findings/6c520622-cfcc-490d-88c4-b7f28288e76c/syz_repro
>
> vhci_hcd vhci_hcd.0: release socket
> vhci_hcd vhci_hcd.0: disconnect device
> ==================================================================
> BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
> BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
> Read of size 1 at addr ffff88816d3a8478 by task kworker/u8:5/5796
>
> CPU: 1 UID: 0 PID: 5796 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> Workqueue: usbip_event event_handler
> Call Trace:
> <TASK>
> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
> print_address_description+0x55/0x1e0 mm/kasan/report.c:378
> print_report+0x58/0x70 mm/kasan/report.c:482
> kasan_report+0x117/0x150 mm/kasan/report.c:595
> __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
> kasan_check_byte include/linux/kasan.h:402 [inline]
> lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
> _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
> unset_event drivers/usb/usbip/usbip_event.c:35 [inline]
> event_handler+0x2b0/0x4b0 drivers/usb/usbip/usbip_event.c:80
> process_one_work kernel/workqueue.c:3322 [inline]
> process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
> worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
> kthread+0x388/0x470 kernel/kthread.c:436
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
>
> Allocated by task 1:
> kasan_save_stack mm/kasan/common.c:57 [inline]
> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
> poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
> __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
> kasan_kmalloc include/linux/kasan.h:263 [inline]
> __do_kmalloc_node mm/slub.c:5362 [inline]
> __kmalloc_noprof+0x375/0x720 mm/slub.c:5387
> _kmalloc_noprof include/linux/slab.h:973 [inline]
> _kzalloc_noprof include/linux/slab.h:1290 [inline]
> __usb_create_hcd+0x67/0x900 drivers/usb/core/hcd.c:2566
> vhci_hcd_probe+0x104/0x3e0 drivers/usb/usbip/vhci_hcd.c:1378
> platform_probe+0xf9/0x190 drivers/base/platform.c:1439
> call_driver_probe drivers/base/dd.c:-1 [inline]
> really_probe+0x254/0xae0 drivers/base/dd.c:706
> __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
> driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
> __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
> bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
> __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
> device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
> bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
> device_add+0x7d7/0xb80 drivers/base/core.c:3772
> platform_device_add+0x4bd/0x860 drivers/base/platform.c:762
> platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902
> vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557
> do_one_initcall+0x250/0x870 init/main.c:1347
> do_initcall_level+0x10a/0x1a0 init/main.c:1409
> do_initcalls+0x59/0xa0 init/main.c:1425
> kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
> kernel_init+0x1d/0x1d0 init/main.c:1548
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>
> Freed by task 5870:
> kasan_save_stack mm/kasan/common.c:57 [inline]
> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
> poison_slab_object mm/kasan/common.c:253 [inline]
> __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
> kasan_slab_free include/linux/kasan.h:235 [inline]
> slab_free_hook mm/slub.c:2705 [inline]
> slab_free mm/slub.c:6405 [inline]
> kfree+0x1c5/0x640 mm/slub.c:6720
> vhci_hcd_remove+0xe4/0x110 drivers/usb/usbip/vhci_hcd.c:1434
> device_remove drivers/base/dd.c:616 [inline]
> __device_release_driver drivers/base/dd.c:1349 [inline]
> device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
> unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244
> kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
> new_sync_write fs/read_write.c:595 [inline]
> vfs_write+0x612/0xba0 fs/read_write.c:687
> ksys_write+0x150/0x270 fs/read_write.c:739
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Last potentially related work creation:
> kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
> kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
> insert_work+0x3d/0x330 kernel/workqueue.c:2226
> __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401
> queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
> usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline]
> unlink1+0x344/0x3e0 drivers/usb/core/hcd.c:1580
> usb_hcd_unlink_urb+0xe6/0x1e0 drivers/usb/core/hcd.c:1617
> usb_kill_urb+0x10b/0x2f0 drivers/usb/core/urb.c:716
> hub_quiesce+0x211/0x330 drivers/usb/core/hub.c:1412
> hub_suspend+0x904/0xad0 drivers/usb/core/hub.c:4008
> usb_suspend_interface drivers/usb/core/driver.c:1323 [inline]
> usb_suspend_both+0x285/0x1040 drivers/usb/core/driver.c:1446
> usb_runtime_suspend+0x58/0x110 drivers/usb/core/driver.c:2000
> __rpm_callback+0x2c7/0x950 drivers/base/power/runtime.c:406
> rpm_callback drivers/base/power/runtime.c:460 [inline]
> rpm_suspend+0x8a0/0x17b0 drivers/base/power/runtime.c:698
> __pm_runtime_suspend+0x12f/0x1a0 drivers/base/power/runtime.c:1167
> pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline]
> usb_new_device+0xadf/0x1620 drivers/usb/core/hub.c:2727
> register_root_hub+0x250/0x5c0 drivers/usb/core/hcd.c:990
> usb_add_hcd+0xac7/0xf80 drivers/usb/core/hcd.c:2987
> vhci_hcd_probe+0x141/0x3e0 drivers/usb/usbip/vhci_hcd.c:1388
> platform_probe+0xf9/0x190 drivers/base/platform.c:1439
> call_driver_probe drivers/base/dd.c:-1 [inline]
> really_probe+0x254/0xae0 drivers/base/dd.c:706
> __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
> driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
> __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
> bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
> __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
> device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
> bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
> device_add+0x7d7/0xb80 drivers/base/core.c:3772
> platform_device_add+0x4bd/0x860 drivers/base/platform.c:762
> platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902
> vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557
> do_one_initcall+0x250/0x870 init/main.c:1347
> do_initcall_level+0x10a/0x1a0 init/main.c:1409
> do_initcalls+0x59/0xa0 init/main.c:1425
> kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
> kernel_init+0x1d/0x1d0 init/main.c:1548
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>
> Second to last potentially related work creation:
> kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
> kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
> insert_work+0x3d/0x330 kernel/workqueue.c:2226
> __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401
> queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452
> rh_call_control drivers/usb/core/hcd.c:706 [inline]
> rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
> usb_hcd_submit_urb+0xa3b/0x1b60 drivers/usb/core/hcd.c:1538
> usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62
> usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
> usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167
> get_port_status drivers/usb/core/hub.c:607 [inline]
> hub_ext_port_status+0x114/0x810 drivers/usb/core/hub.c:624
> usb_hub_port_status drivers/usb/core/hub.c:674 [inline]
> hub_activate+0x740/0x1b20 drivers/usb/core/hub.c:1185
> process_one_work kernel/workqueue.c:3322 [inline]
> process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
> worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
> kthread+0x388/0x470 kernel/kthread.c:436
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>
> The buggy address belongs to the object at ffff88816d3a8000
> which belongs to the cache kmalloc-8k of size 8192
> The buggy address is located 1144 bytes inside of
> freed 8192-byte region [ffff88816d3a8000, ffff88816d3aa000)
>
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16d3a8
> head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
> page_type: f5(slab)
> raw: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000
> raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
> head: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000
> head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
> head: 057ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
> head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 15263763575, free_ts 0
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
> prep_new_page mm/page_alloc.c:1867 [inline]
> get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
> __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
> alloc_slab_page mm/slub.c:3294 [inline]
> allocate_slab+0x79/0x5e0 mm/slub.c:3408
> new_slab mm/slub.c:3454 [inline]
> refill_objects+0x2d5/0x350 mm/slub.c:7338
> refill_sheaf mm/slub.c:2832 [inline]
> __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703
> alloc_from_pcs mm/slub.c:4801 [inline]
> slab_alloc_node mm/slub.c:4933 [inline]
> __kmalloc_cache_noprof+0x3a7/0x660 mm/slub.c:5511
> _kmalloc_noprof include/linux/slab.h:969 [inline]
> _kzalloc_noprof include/linux/slab.h:1290 [inline]
> dummy_hcd_init+0x3e2/0xd00 drivers/usb/gadget/udc/dummy_hcd.c:2836
> do_one_initcall+0x250/0x870 init/main.c:1347
> do_initcall_level+0x10a/0x1a0 init/main.c:1409
> do_initcalls+0x59/0xa0 init/main.c:1425
> kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
> kernel_init+0x1d/0x1d0 init/main.c:1548
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> page_owner free stack trace missing
>
> Memory state around the buggy address:
> ffff88816d3a8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88816d3a8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff88816d3a8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88816d3a8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88816d3a8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> To test a patch for this bug, please reply with `#syz test`
> (should be on a separate line).
>
> The patch should be attached to the email.
> Note: arguments like custom git repos and branches are not supported.
>
> The email will later be sent to:
> [akpm@linux-foundation.org axboe@kernel.dk dsterba@suse.com haoqinhuang7@gmail.com haoqinhuang@tencent.com linux-block@vger.kernel.org linux-kernel@vger.kernel.org minchan@kernel.org senozhatsky@chromium.org terrelln@fb.com zigiwang@tencent.com]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
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>
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2026-07-29 10:58 [moderation/CI] Re: zram: fix early release of global cdict/ddict in per-CPU error path syzbot ci
2026-07-29 12:11 ` Aleksandr Nogikh
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