[moderation] [dri?] KASAN: slab-use-after-free Read in drm_sysfs_hotplug_event
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syzbot
Jul 10, 2025, 4:19:34 AM7/10/25
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 05df91921da6 Merge tag 'v6.16-rc4-smb3-client-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16da228c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=45bd916a213c79bb
dashboard link: https://syzkaller.appspot.com/bug?extid=b1dddaee4da2b2981074
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [air...@gmail.com air...@redhat.com dri-...@lists.freedesktop.org linux-...@vger.kernel.org maarten....@linux.intel.com mri...@kernel.org se...@poorly.run sim...@ffwll.ch tzimm...@suse.de]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f00096b2a781/disk-05df9192.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be1a9e143275/vmlinux-05df9192.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fb237bb1ea32/bzImage-05df9192.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b1ddda...@syzkaller.appspotmail.com
udl 1-1:0.0: [drm] *ERROR* Read EDID byte 0 failed err ffffffb9
==================================================================
BUG: KASAN: slab-use-after-free in get_kobj_path_length lib/kobject.c:119 [inline]
BUG: KASAN: slab-use-after-free in kobject_get_path+0x250/0x2a0 lib/kobject.c:158
Read of size 8 at addr ffff8880250e8f98 by task kworker/1:1/43
CPU: 1 UID: 0 PID: 43 Comm: kworker/1:1 Not tainted 6.16.0-rc4-syzkaller-00319-g05df91921da6 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events output_poll_execute
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
get_kobj_path_length lib/kobject.c:119 [inline]
kobject_get_path+0x250/0x2a0 lib/kobject.c:158
kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545
drm_sysfs_hotplug_event+0x108/0x160 drivers/gpu/drm/drm_sysfs.c:448
drm_kms_helper_hotplug_event drivers/gpu/drm/drm_probe_helper.c:734 [inline]
output_poll_execute+0x694/0x880 drivers/gpu/drm/drm_probe_helper.c:847
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5984:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
class_dir_create_and_add drivers/base/core.c:3226 [inline]
get_device_parent+0x2b1/0x4e0 drivers/base/core.c:3286
device_add+0x1ad/0x1a70 drivers/base/core.c:3616
drm_minor_register+0x159/0x360 drivers/gpu/drm/drm_drv.c:195
drm_dev_register+0x1f1/0x910 drivers/gpu/drm/drm_drv.c:1069
udl_usb_probe+0xa6/0x1a0 drivers/gpu/drm/udl/udl_drv.c:99
usb_probe_interface+0x303/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2694
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x2eb7/0x4fa0 drivers/usb/core/hub.c:5948
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 5984:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1e7/0x5a0 lib/kobject.c:737
cleanup_glue_dir drivers/base/core.c:3418 [inline]
cleanup_glue_dir+0x1c1/0x250 drivers/base/core.c:3358
device_del+0x659/0x9f0 drivers/base/core.c:3902
drm_minor_unregister+0x178/0x2a0 drivers/gpu/drm/drm_drv.c:226
drm_dev_unregister+0x139/0x1c0 drivers/gpu/drm/drm_drv.c:1151
drm_dev_unplug+0x52/0xc0 drivers/gpu/drm/drm_drv.c:497
udl_usb_disconnect+0x3a/0x50 drivers/gpu/drm/udl/udl_drv.c:115
usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x125/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
device_del+0x396/0x9f0 drivers/base/core.c:3881
usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
usb_disconnect+0x2e1/0x9c0 drivers/usb/core/hub.c:2344
hub_port_connect drivers/usb/core/hub.c:5406 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x1c57/0x4fa0 drivers/usb/core/hub.c:5948
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff8880250e8f80
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
freed 96-byte region [ffff8880250e8f80, ffff8880250e8fe0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x250e8
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000200020 00000000f5000000 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6081, tgid 6067 (syz.2.36), ts 81771904479, free_ts 81190887948
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354
kmalloc_noprof include/linux/slab.h:905 [inline]
dst_cow_metrics_generic+0x4c/0x1e0 net/core/dst.c:193
dst_metrics_write_ptr include/net/dst.h:133 [inline]
dst_metric_set include/net/dst.h:194 [inline]
icmp6_dst_alloc+0x418/0x4f0 net/ipv6/route.c:3337
ndisc_send_skb+0x1372/0x1e40 net/ipv6/ndisc.c:493
ndisc_send_rs+0x129/0x670 net/ipv6/ndisc.c:723
addrconf_rs_timer+0x40d/0x840 net/ipv6/addrconf.c:4041
call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
page last free pid 0 tgid 0 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
pagetable_free include/linux/mm.h:2879 [inline]
pagetable_dtor_free include/linux/mm.h:2977 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff8880250e8e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8880250e8f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8880250e8f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff8880250e9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8880250e9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: 05df91921da6 Merge tag 'v6.16-rc4-smb3-client-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16da228c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=45bd916a213c79bb
dashboard link: https://syzkaller.appspot.com/bug?extid=b1dddaee4da2b2981074
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [air...@gmail.com air...@redhat.com dri-...@lists.freedesktop.org linux-...@vger.kernel.org maarten....@linux.intel.com mri...@kernel.org se...@poorly.run sim...@ffwll.ch tzimm...@suse.de]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f00096b2a781/disk-05df9192.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be1a9e143275/vmlinux-05df9192.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fb237bb1ea32/bzImage-05df9192.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b1ddda...@syzkaller.appspotmail.com
udl 1-1:0.0: [drm] *ERROR* Read EDID byte 0 failed err ffffffb9
==================================================================
BUG: KASAN: slab-use-after-free in get_kobj_path_length lib/kobject.c:119 [inline]
BUG: KASAN: slab-use-after-free in kobject_get_path+0x250/0x2a0 lib/kobject.c:158
Read of size 8 at addr ffff8880250e8f98 by task kworker/1:1/43
CPU: 1 UID: 0 PID: 43 Comm: kworker/1:1 Not tainted 6.16.0-rc4-syzkaller-00319-g05df91921da6 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events output_poll_execute
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
get_kobj_path_length lib/kobject.c:119 [inline]
kobject_get_path+0x250/0x2a0 lib/kobject.c:158
kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545
drm_sysfs_hotplug_event+0x108/0x160 drivers/gpu/drm/drm_sysfs.c:448
drm_kms_helper_hotplug_event drivers/gpu/drm/drm_probe_helper.c:734 [inline]
output_poll_execute+0x694/0x880 drivers/gpu/drm/drm_probe_helper.c:847
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5984:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
class_dir_create_and_add drivers/base/core.c:3226 [inline]
get_device_parent+0x2b1/0x4e0 drivers/base/core.c:3286
device_add+0x1ad/0x1a70 drivers/base/core.c:3616
drm_minor_register+0x159/0x360 drivers/gpu/drm/drm_drv.c:195
drm_dev_register+0x1f1/0x910 drivers/gpu/drm/drm_drv.c:1069
udl_usb_probe+0xa6/0x1a0 drivers/gpu/drm/udl/udl_drv.c:99
usb_probe_interface+0x303/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2694
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x2eb7/0x4fa0 drivers/usb/core/hub.c:5948
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 5984:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1e7/0x5a0 lib/kobject.c:737
cleanup_glue_dir drivers/base/core.c:3418 [inline]
cleanup_glue_dir+0x1c1/0x250 drivers/base/core.c:3358
device_del+0x659/0x9f0 drivers/base/core.c:3902
drm_minor_unregister+0x178/0x2a0 drivers/gpu/drm/drm_drv.c:226
drm_dev_unregister+0x139/0x1c0 drivers/gpu/drm/drm_drv.c:1151
drm_dev_unplug+0x52/0xc0 drivers/gpu/drm/drm_drv.c:497
udl_usb_disconnect+0x3a/0x50 drivers/gpu/drm/udl/udl_drv.c:115
usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x125/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
device_del+0x396/0x9f0 drivers/base/core.c:3881
usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
usb_disconnect+0x2e1/0x9c0 drivers/usb/core/hub.c:2344
hub_port_connect drivers/usb/core/hub.c:5406 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x1c57/0x4fa0 drivers/usb/core/hub.c:5948
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff8880250e8f80
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
freed 96-byte region [ffff8880250e8f80, ffff8880250e8fe0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x250e8
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000200020 00000000f5000000 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6081, tgid 6067 (syz.2.36), ts 81771904479, free_ts 81190887948
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354
kmalloc_noprof include/linux/slab.h:905 [inline]
dst_cow_metrics_generic+0x4c/0x1e0 net/core/dst.c:193
dst_metrics_write_ptr include/net/dst.h:133 [inline]
dst_metric_set include/net/dst.h:194 [inline]
icmp6_dst_alloc+0x418/0x4f0 net/ipv6/route.c:3337
ndisc_send_skb+0x1372/0x1e40 net/ipv6/ndisc.c:493
ndisc_send_rs+0x129/0x670 net/ipv6/ndisc.c:723
addrconf_rs_timer+0x40d/0x840 net/ipv6/addrconf.c:4041
call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
page last free pid 0 tgid 0 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
pagetable_free include/linux/mm.h:2879 [inline]
pagetable_dtor_free include/linux/mm.h:2977 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff8880250e8e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8880250e8f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8880250e8f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff8880250e9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8880250e9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
This report is generated by a bot. It may contain errors.
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syzbot
Oct 4, 2025, 4:10:18 AM10/4/25
to syzkaller-upst...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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