[v6.6] KASAN: slab-out-of-bounds Read in mcp2221_raw_event
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syzbot
Jun 3, 2026, 9:39:24 AM (3 days ago) Jun 3
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 924b4a879cbb Linux 6.6.142
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11185f2e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=90249d2d52c08134
dashboard link: https://syzkaller.appspot.com/bug?extid=4823889ef9f2f6f7ea07
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd13425862f1/disk-924b4a87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eaa5de9e440b/vmlinux-924b4a87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5a9aa3293c15/bzImage-924b4a87.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+482388...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
Read of size 1 at addr ffff888069ed3fff by task kworker/0:2/43
CPU: 0 PID: 43 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
<IRQ>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
hid_input_report+0x400/0x510 drivers/hid/hid-core.c:2103
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:call_rcu+0x6da/0x950 kernel/rcu/tree.c:2837
Code: f7 84 24 a0 00 00 00 00 02 00 00 43 c6 44 25 04 f8 75 4f f7 44 24 58 00 02 00 00 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc90000b467a0 EFLAGS: 00000206
RAX: 086dabbe11e7a300 RBX: ffff88805fd311a0 RCX: 086dabbe11e7a300
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc90000b468d0 R08: ffffffff911cd50f R09: 1ffffffff2239aa1
R10: dffffc0000000000 R11: fffffbfff2239aa2 R12: dffffc0000000000
R13: 1ffff92000168d04 R14: 1ffff110171c7a0d R15: 0000000000000015
kernfs_put+0x1d3/0x360 fs/kernfs/dir.c:578
kernfs_remove_by_name_ns+0xe4/0x150 fs/kernfs/dir.c:1696
kernfs_remove_by_name include/linux/kernfs.h:624 [inline]
sysfs_unmerge_group+0xd4/0x130 fs/sysfs/group.c:372
i2c_register_adapter+0x540/0xfb0 drivers/i2c/i2c-core-base.c:1564
devm_i2c_add_adapter+0x1b/0x80 drivers/i2c/i2c-core-base.c:1842
mcp2221_probe+0x300/0x760 drivers/hid/hid-mcp2221.c:1198
__hid_device_probe drivers/hid/hid-core.c:2652 [inline]
hid_device_probe+0x293/0x5b0 drivers/hid/hid-core.c:2689
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2835
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2265
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
The buggy address belongs to the physical page:
page:ffffea0001a7b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x69ed0
head:ffffea0001a7b400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO), pid 3480, tgid 3480 (kworker/u4:9), ts 146902404093, free_ts 146886065905
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1148
kmalloc_large+0x1b/0x110 mm/slab_common.c:1165
rate_control_alloc_sta net/mac80211/rate.h:43 [inline]
sta_prepare_rate_control net/mac80211/sta_info.c:477 [inline]
__sta_info_alloc+0x1011/0x2740 net/mac80211/sta_info.c:623
ieee80211_ibss_add_sta+0x5f9/0x8d0 net/mac80211/ibss.c:635
ieee80211_update_sta_info net/mac80211/ibss.c:1031 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1122 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline]
ieee80211_ibss_rx_queued_mgmt+0x14f4/0x2c80 net/mac80211/ibss.c:1642
ieee80211_iface_process_skb net/mac80211/iface.c:1655 [inline]
ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1709
cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_node+0x13a/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
ref_tracker_alloc+0x162/0x4c0 lib/ref_tracker.c:203
__netdev_tracker_alloc include/linux/netdevice.h:4110 [inline]
netdev_tracker_alloc include/linux/netdevice.h:4122 [inline]
netdev_get_by_index+0x79/0xa0 net/core/dev.c:911
fib6_nh_init+0x203/0x1ff0 net/ipv6/route.c:3584
ip6_route_info_create+0x94d/0x1240 net/ipv6/route.c:3854
ip6_route_add+0x28/0x160 net/ipv6/route.c:3898
addrconf_add_mroute net/ipv6/addrconf.c:2522 [inline]
addrconf_add_dev+0x29c/0x3b0 net/ipv6/addrconf.c:2540
addrconf_dev_config net/ipv6/addrconf.c:3469 [inline]
addrconf_init_auto_addrs+0x67e/0xb20 net/ipv6/addrconf.c:3557
Memory state around the buggy address:
ffff888069ed3e80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff888069ed3f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff888069ed3f80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff888069ed4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888069ed4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: f7 84 24 a0 00 00 00 testl $0x200,0xa0(%rsp)
7: 00 02 00 00
b: 43 c6 44 25 04 f8 movb $0xf8,0x4(%r13,%r12,1)
11: 75 4f jne 0x62
13: f7 44 24 58 00 02 00 testl $0x200,0x58(%rsp)
1a: 00
1b: 74 01 je 0x1e
1d: fb sti
1e: 48 c7 84 24 80 00 00 movq $0x45e0360e,0x80(%rsp)
25: 00 0e 36 e0 45
* 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction
31: 00 00
33: 43 c7 44 25 08 00 00 movl $0x0,0x8(%r13,%r12,1)
3a: 00 00
3c: 65 gs
3d: 48 rex.W
3e: 8b .byte 0x8b
3f: 04 .byte 0x4
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to undo deduplication, reply with:
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syzbot found the following issue on:
HEAD commit: 924b4a879cbb Linux 6.6.142
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11185f2e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=90249d2d52c08134
dashboard link: https://syzkaller.appspot.com/bug?extid=4823889ef9f2f6f7ea07
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd13425862f1/disk-924b4a87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eaa5de9e440b/vmlinux-924b4a87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5a9aa3293c15/bzImage-924b4a87.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+482388...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
Read of size 1 at addr ffff888069ed3fff by task kworker/0:2/43
CPU: 0 PID: 43 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
<IRQ>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
hid_input_report+0x400/0x510 drivers/hid/hid-core.c:2103
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:call_rcu+0x6da/0x950 kernel/rcu/tree.c:2837
Code: f7 84 24 a0 00 00 00 00 02 00 00 43 c6 44 25 04 f8 75 4f f7 44 24 58 00 02 00 00 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc90000b467a0 EFLAGS: 00000206
RAX: 086dabbe11e7a300 RBX: ffff88805fd311a0 RCX: 086dabbe11e7a300
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc90000b468d0 R08: ffffffff911cd50f R09: 1ffffffff2239aa1
R10: dffffc0000000000 R11: fffffbfff2239aa2 R12: dffffc0000000000
R13: 1ffff92000168d04 R14: 1ffff110171c7a0d R15: 0000000000000015
kernfs_put+0x1d3/0x360 fs/kernfs/dir.c:578
kernfs_remove_by_name_ns+0xe4/0x150 fs/kernfs/dir.c:1696
kernfs_remove_by_name include/linux/kernfs.h:624 [inline]
sysfs_unmerge_group+0xd4/0x130 fs/sysfs/group.c:372
i2c_register_adapter+0x540/0xfb0 drivers/i2c/i2c-core-base.c:1564
devm_i2c_add_adapter+0x1b/0x80 drivers/i2c/i2c-core-base.c:1842
mcp2221_probe+0x300/0x760 drivers/hid/hid-mcp2221.c:1198
__hid_device_probe drivers/hid/hid-core.c:2652 [inline]
hid_device_probe+0x293/0x5b0 drivers/hid/hid-core.c:2689
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2835
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2265
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
The buggy address belongs to the physical page:
page:ffffea0001a7b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x69ed0
head:ffffea0001a7b400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO), pid 3480, tgid 3480 (kworker/u4:9), ts 146902404093, free_ts 146886065905
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1148
kmalloc_large+0x1b/0x110 mm/slab_common.c:1165
rate_control_alloc_sta net/mac80211/rate.h:43 [inline]
sta_prepare_rate_control net/mac80211/sta_info.c:477 [inline]
__sta_info_alloc+0x1011/0x2740 net/mac80211/sta_info.c:623
ieee80211_ibss_add_sta+0x5f9/0x8d0 net/mac80211/ibss.c:635
ieee80211_update_sta_info net/mac80211/ibss.c:1031 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1122 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline]
ieee80211_ibss_rx_queued_mgmt+0x14f4/0x2c80 net/mac80211/ibss.c:1642
ieee80211_iface_process_skb net/mac80211/iface.c:1655 [inline]
ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1709
cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_node+0x13a/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
ref_tracker_alloc+0x162/0x4c0 lib/ref_tracker.c:203
__netdev_tracker_alloc include/linux/netdevice.h:4110 [inline]
netdev_tracker_alloc include/linux/netdevice.h:4122 [inline]
netdev_get_by_index+0x79/0xa0 net/core/dev.c:911
fib6_nh_init+0x203/0x1ff0 net/ipv6/route.c:3584
ip6_route_info_create+0x94d/0x1240 net/ipv6/route.c:3854
ip6_route_add+0x28/0x160 net/ipv6/route.c:3898
addrconf_add_mroute net/ipv6/addrconf.c:2522 [inline]
addrconf_add_dev+0x29c/0x3b0 net/ipv6/addrconf.c:2540
addrconf_dev_config net/ipv6/addrconf.c:3469 [inline]
addrconf_init_auto_addrs+0x67e/0xb20 net/ipv6/addrconf.c:3557
Memory state around the buggy address:
ffff888069ed3e80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff888069ed3f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff888069ed3f80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff888069ed4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888069ed4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: f7 84 24 a0 00 00 00 testl $0x200,0xa0(%rsp)
7: 00 02 00 00
b: 43 c6 44 25 04 f8 movb $0xf8,0x4(%r13,%r12,1)
11: 75 4f jne 0x62
13: f7 44 24 58 00 02 00 testl $0x200,0x58(%rsp)
1a: 00
1b: 74 01 je 0x1e
1d: fb sti
1e: 48 c7 84 24 80 00 00 movq $0x45e0360e,0x80(%rsp)
25: 00 0e 36 e0 45
* 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction
31: 00 00
33: 43 c7 44 25 08 00 00 movl $0x0,0x8(%r13,%r12,1)
3a: 00 00
3c: 65 gs
3d: 48 rex.W
3e: 8b .byte 0x8b
3f: 04 .byte 0x4
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot
Jun 4, 2026, 10:58:24 PM (2 days ago) Jun 4
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 924b4a879cbb Linux 6.6.142
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17c7db7e580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139c2bec580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd13425862f1/disk-924b4a87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eaa5de9e440b/vmlinux-924b4a87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5a9aa3293c15/bzImage-924b4a87.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e0b2e08564d4/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=154ef3ec580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+482388...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
Read of size 1 at addr ffff88805f87ffff by task syz-executor/5891
CPU: 0 PID: 5891 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Code: d9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 48 89 df e8 7e 35 a4 00 e9 3c ff ff ff e8 64 24 4d 09 0f 1f 40 00 f3 0f 1e fa 55 <41> 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 54 f5 4b
RSP: 0018:ffffc9000468f298 EFLAGS: 00000293
RAX: ffffffff8132a5a2 RBX: ffffc9000468f360 RCX: ffff888022a78000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffc9000468f2a8
RBP: ffffc9000468f330 R08: ffff888022a78000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8a88631a
R13: 1ffff1100454f0ae R14: ffffffff8175c750 R15: ffffc9000468f2a8
arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
release_pages+0x1f7a/0x2200 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x630/0x1b20 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x245/0x9e0 mm/shmem.c:1264
evict+0x4ca/0x8d0 fs/inode.c:705
__dentry_kill+0x431/0x650 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
__fput+0x5e5/0x970 fs/file_table.c:392
task_work_run+0x1d4/0x260 kernel/task_work.c:245
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+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f083b19e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcccb63cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f083b2321ca RCX: 00007f083b19e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcccb63db0
RBP: 00007ffcccb63db0 R08: 00007ffcccb64db0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcccb64e40
R13: 00007f083b2321ca R14: 0000000000014ed6 R15: 00007ffcccb64e80
</TASK>
Allocated by task 77:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x293/0xb10 drivers/net/netdevsim/dev.c:851
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
skb_kfree_head net/core/skbuff.c:946 [inline]
skb_free_head net/core/skbuff.c:958 [inline]
skb_release_data+0x5dc/0x7b0 net/core/skbuff.c:988
skb_release_all net/core/skbuff.c:1054 [inline]
__kfree_skb net/core/skbuff.c:1068 [inline]
consume_skb+0xb2/0x110 net/core/skbuff.c:1284
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x77e/0xb10 drivers/net/netdevsim/dev.c:851
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 4095 bytes to the right of
allocated 4096-byte region [ffff88805f87e000, ffff88805f87f000)
The buggy address belongs to the physical page:
page:ffffea00017e1e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f878
head:ffffea00017e1e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c42140 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node_track_caller+0xa2/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x293/0xb10 drivers/net/netdevsim/dev.c:851
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
vma_lock_alloc kernel/fork.c:461 [inline]
vm_area_dup+0x61/0x270 kernel/fork.c:514
__split_vma+0x1b4/0xc60 mm/mmap.c:2373
do_vmi_align_munmap+0x3d0/0x16d0 mm/mmap.c:2514
do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660
__vm_munmap+0x1a2/0x3c0 mm/mmap.c:2961
__do_sys_munmap mm/mmap.c:2978 [inline]
__se_sys_munmap mm/mmap.c:2975 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:2975
Memory state around the buggy address:
ffff88805f87fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805f87ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805f87ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88805f880000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88805f880080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 80 e1 07 and $0x7,%cl
3: 80 c1 03 add $0x3,%cl
6: 38 c1 cmp %al,%cl
8: 0f 8c 49 ff ff ff jl 0xffffff57
e: 48 89 df mov %rbx,%rdi
11: e8 7e 35 a4 00 call 0xa43594
16: e9 3c ff ff ff jmp 0xffffff57
1b: e8 64 24 4d 09 call 0x94d2484
20: 0f 1f 40 00 nopl 0x0(%rax)
24: f3 0f 1e fa endbr64
28: 55 push %rbp
* 29: 41 57 push %r15 <-- trapping instruction
2b: 41 56 push %r14
2d: 53 push %rbx
2e: 48 89 fb mov %rdi,%rbx
31: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
38: fc ff df
3b: e8 .byte 0xe8
3c: 54 push %rsp
3d: f5 cmc
3e: 4b rex.WXB
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: 924b4a879cbb Linux 6.6.142
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=90249d2d52c08134
dashboard link: https://syzkaller.appspot.com/bug?extid=4823889ef9f2f6f7ea07
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1027db7e580000
dashboard link: https://syzkaller.appspot.com/bug?extid=4823889ef9f2f6f7ea07
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139c2bec580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd13425862f1/disk-924b4a87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eaa5de9e440b/vmlinux-924b4a87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5a9aa3293c15/bzImage-924b4a87.xz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=154ef3ec580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+482388...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
CPU: 0 PID: 5891 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<IRQ>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
hid_input_report+0x400/0x510 drivers/hid/hid-core.c:2103
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_get_return_address+0x5/0xc0 arch/x86/kernel/unwind_orc.c:365
<IRQ>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
hid_input_report+0x400/0x510 drivers/hid/hid-core.c:2103
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
Code: d9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 48 89 df e8 7e 35 a4 00 e9 3c ff ff ff e8 64 24 4d 09 0f 1f 40 00 f3 0f 1e fa 55 <41> 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 54 f5 4b
RSP: 0018:ffffc9000468f298 EFLAGS: 00000293
RAX: ffffffff8132a5a2 RBX: ffffc9000468f360 RCX: ffff888022a78000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffc9000468f2a8
RBP: ffffc9000468f330 R08: ffff888022a78000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8a88631a
R13: 1ffff1100454f0ae R14: ffffffff8175c750 R15: ffffc9000468f2a8
arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2504
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
release_pages+0x1f7a/0x2200 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x630/0x1b20 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x245/0x9e0 mm/shmem.c:1264
evict+0x4ca/0x8d0 fs/inode.c:705
__dentry_kill+0x431/0x650 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
__fput+0x5e5/0x970 fs/file_table.c:392
task_work_run+0x1d4/0x260 kernel/task_work.c:245
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+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f083b19e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcccb63cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f083b2321ca RCX: 00007f083b19e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcccb63db0
RBP: 00007ffcccb63db0 R08: 00007ffcccb64db0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcccb64e40
R13: 00007f083b2321ca R14: 0000000000014ed6 R15: 00007ffcccb64e80
</TASK>
Allocated by task 77:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x293/0xb10 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Freed by task 77:
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
skb_kfree_head net/core/skbuff.c:946 [inline]
skb_free_head net/core/skbuff.c:958 [inline]
skb_release_data+0x5dc/0x7b0 net/core/skbuff.c:988
skb_release_all net/core/skbuff.c:1054 [inline]
__kfree_skb net/core/skbuff.c:1068 [inline]
consume_skb+0xb2/0x110 net/core/skbuff.c:1284
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x77e/0xb10 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805f87e000
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 4095 bytes to the right of
allocated 4096-byte region [ffff88805f87e000, ffff88805f87f000)
The buggy address belongs to the physical page:
head:ffffea00017e1e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c42140 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 77, tgid 77 (kworker/u4:5), ts 84487198921, free_ts 84431385920
page_owner tracks the page as allocated
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
alloc_slab_page+0x5d/0x160 mm/slub.c:1881
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node_track_caller+0xa2/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x293/0xb10 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
discard_slab mm/slub.c:2127 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
vma_lock_alloc kernel/fork.c:461 [inline]
vm_area_dup+0x61/0x270 kernel/fork.c:514
__split_vma+0x1b4/0xc60 mm/mmap.c:2373
do_vmi_align_munmap+0x3d0/0x16d0 mm/mmap.c:2514
do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660
__vm_munmap+0x1a2/0x3c0 mm/mmap.c:2961
__do_sys_munmap mm/mmap.c:2978 [inline]
__se_sys_munmap mm/mmap.c:2975 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:2975
Memory state around the buggy address:
ffff88805f87ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805f87ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88805f880000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88805f880080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 80 e1 07 and $0x7,%cl
3: 80 c1 03 add $0x3,%cl
6: 38 c1 cmp %al,%cl
8: 0f 8c 49 ff ff ff jl 0xffffff57
e: 48 89 df mov %rbx,%rdi
11: e8 7e 35 a4 00 call 0xa43594
16: e9 3c ff ff ff jmp 0xffffff57
1b: e8 64 24 4d 09 call 0x94d2484
20: 0f 1f 40 00 nopl 0x0(%rax)
24: f3 0f 1e fa endbr64
28: 55 push %rbp
* 29: 41 57 push %r15 <-- trapping instruction
2b: 41 56 push %r14
2d: 53 push %rbx
2e: 48 89 fb mov %rdi,%rbx
31: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
38: fc ff df
3b: e8 .byte 0xe8
3c: 54 push %rsp
3d: f5 cmc
3e: 4b rex.WXB
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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