* [syzbot] [mm?] KASAN: invalid-free in rcu_free_sheaf
@ 2026-06-12 20:43 syzbot
2026-10-17 11:54 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2026-06-12 20:43 UTC (permalink / raw)
To: linux-kernel, linux-mm, netdev, peterz, syzkaller-bugs, tglx
Hello,
syzbot found the following issue on:
HEAD commit: 0ce346bf2f68 Merge branch 'net-shaper-follow-ups-to-recent..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15a50986580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2c40e3284434c6f1
dashboard link: https://syzkaller.appspot.com/bug?extid=60332fd095f8bb2946ad
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/fcb2184c91a0/disk-0ce346bf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/44a7baa2dfdd/vmlinux-0ce346bf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8ef85b3aefe3/bzImage-0ce346bf.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60332fd095f8bb2946ad@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: double-free in rcu_free_sheaf+0x31/0x200 mm/slub.c:5850
Free of addr ffff888026c2d380 by task ksoftirqd/0/15
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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_invalid_free+0xea/0x110 mm/kasan/report.c:557
check_slab_allocation mm/kasan/common.c:-1 [inline]
__kasan_slab_pre_free+0x104/0x120 mm/kasan/common.c:261
kasan_slab_pre_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:2634 [inline]
__rcu_free_sheaf_prepare+0x10a/0x2a0 mm/slub.c:2940
rcu_free_sheaf+0x31/0x200 mm/slub.c:5850
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x389/0x470 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 5613:
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]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5420
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
hwsim_update_pib+0x88/0x450 drivers/net/ieee802154/mac802154_hwsim.c:101
hwsim_set_promiscuous_mode+0x196/0x2e0 drivers/net/ieee802154/mac802154_hwsim.c:323
drv_set_promiscuous_mode+0x159/0x2e0 net/mac802154/driver-ops.h:127
drv_start net/mac802154/driver-ops.h:195 [inline]
mac802154_slave_open net/mac802154/iface.c:196 [inline]
mac802154_wpan_open+0x19b3/0x2a70 net/mac802154/iface.c:295
__dev_open+0x44d/0x830 net/core/dev.c:1702
__dev_change_flags+0x2fa/0x7e0 net/core/dev.c:9752
netif_change_flags+0x88/0x1a0 net/core/dev.c:9815
do_setlink+0xfa5/0x45a0 net/core/rtnetlink.c:3207
rtnl_changelink net/core/rtnetlink.c:3841 [inline]
__rtnl_newlink net/core/rtnetlink.c:4014 [inline]
rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4151
rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:7068
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2556
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
__sys_sendto+0x672/0x710 net/socket.c:2265
__do_sys_sendto net/socket.c:2272 [inline]
__se_sys_sendto net/socket.c:2268 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2268
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
Freed by task 15:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 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:2689 [inline]
__rcu_free_sheaf_prepare+0x12d/0x2a0 mm/slub.c:2940
rcu_free_sheaf+0x31/0x200 mm/slub.c:5850
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x389/0x470 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 ffff888026c2d380
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
64-byte region [ffff888026c2d380, ffff888026c2d3c0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888026c2d780 pfn:0x26c2d
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88813fe1a8c0 ffffea0000d74490 ffffea0001fcda50
raw: ffff888026c2d780 0000000800200010 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 137, tgid 137 (kworker/u8:5), ts 5542876120, free_ts 5542851482
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853
prep_new_page mm/page_alloc.c:1861 [inline]
get_page_from_freelist+0x2593/0x2610 mm/page_alloc.c:3941
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221
alloc_slab_page mm/slub.c:3278 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3467
new_slab mm/slub.c:3525 [inline]
refill_objects+0x339/0x3d0 mm/slub.c:7272
refill_sheaf mm/slub.c:2816 [inline]
__pcs_replace_empty_main+0x321/0x720 mm/slub.c:4652
alloc_from_pcs mm/slub.c:4750 [inline]
slab_alloc_node mm/slub.c:4884 [inline]
__do_kmalloc_node mm/slub.c:5295 [inline]
__kmalloc_node_noprof+0x577/0x7c0 mm/slub.c:5302
kmalloc_node_noprof include/linux/slab.h:1081 [inline]
__vmalloc_area_node mm/vmalloc.c:3857 [inline]
__vmalloc_node_range_noprof+0x5ef/0x1750 mm/vmalloc.c:4064
__vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124
alloc_thread_stack_node kernel/fork.c:357 [inline]
dup_task_struct+0x298/0x840 kernel/fork.c:926
copy_process+0x89b/0x4440 kernel/fork.c:2090
kernel_clone+0x2d7/0x940 kernel/fork.c:2722
user_mode_thread+0x110/0x180 kernel/fork.c:2798
call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
page last free pid 137 tgid 137 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1397 [inline]
__free_frozen_pages+0xc1c/0xd30 mm/page_alloc.c:2938
__kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
__kasan_populate_vmalloc+0x1b2/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xd47/0x1480 mm/vmalloc.c:2123
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3226
__vmalloc_node_range_noprof+0x36a/0x1750 mm/vmalloc.c:4024
__vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124
alloc_thread_stack_node kernel/fork.c:357 [inline]
dup_task_struct+0x298/0x840 kernel/fork.c:926
copy_process+0x89b/0x4440 kernel/fork.c:2090
kernel_clone+0x2d7/0x940 kernel/fork.c:2722
user_mode_thread+0x110/0x180 kernel/fork.c:2798
call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
kthread+0x389/0x470 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
Memory state around the buggy address:
ffff888026c2d280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888026c2d300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888026c2d380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888026c2d400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888026c2d480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
---
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [mm?] KASAN: invalid-free in rcu_free_sheaf
2026-06-12 20:43 [syzbot] [mm?] KASAN: invalid-free in rcu_free_sheaf syzbot
@ 2026-10-17 11:54 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2026-10-17 11:54 UTC (permalink / raw)
To: alex.aring, alhouseenyousef, andrew, davem, devnexen, edumazet,
gregkh, kuba, linux-kernel, linux-mm, linux-wpan, malayarout91,
miquel.raynal, netdev, pabeni, patches, peterz, sashal,
stable-commits, stable, stefan, syzkaller-bugs, tglx
syzbot has found a reproducer for the following issue on:
HEAD commit: 00accbd9d502 calipso: update payload_len when removing the..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git
console output: https://syzkaller.appspot.com/x/log.txt?x=159a8121580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c4b098695335c89f
dashboard link: https://syzkaller.appspot.com/bug?extid=60332fd095f8bb2946ad
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1599960d580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60332fd095f8bb2946ad@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: double-free in rcu_free_sheaf+0x31/0x200 mm/slub.c:6061
Free of addr ffff88803149d500 by task swapper/0/0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
<IRQ>
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_invalid_free+0xea/0x110 mm/kasan/report.c:557
check_slab_allocation mm/kasan/common.c:-1 [inline]
__kasan_slab_pre_free+0x104/0x120 mm/kasan/common.c:272
kasan_slab_pre_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:2693 [inline]
__rcu_free_sheaf_prepare+0x10a/0x2a0 mm/slub.c:3009
rcu_free_sheaf+0x31/0x200 mm/slub.c:6061
rcu_do_batch kernel/rcu/tree.c:2650 [inline]
rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 0b 8b 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 c5 20 00 fb f4 <e9> 8c 08 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8fa07ca0 EFLAGS: 00000246
RAX: 00000000000a9303 RBX: ffffffff819bed20 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e469bdf RDI: ffffffff8c6ddb80
RBP: ffffffff8fa07d78 R08: ffff8880b8433a1b R09: 1ffff11017086743
R10: dffffc0000000000 R11: ffffed1017086744 R12: 0000000000000000
R13: 1ffffffff1f51e00 R14: 1ffffffff1f40f9c R15: dffffc0000000000
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x2e0/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
rest_init+0x378/0x3a0 init/main.c:732
start_kernel+0x392/0x3e0 init/main.c:1190
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157
</TASK>
Allocated by task 977:
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:409 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
hwsim_update_pib+0x7e/0x400 drivers/net/ieee802154/mac802154_hwsim.c:103
hwsim_set_promiscuous_mode+0x196/0x2e0 drivers/net/ieee802154/mac802154_hwsim.c:326
drv_set_promiscuous_mode+0x159/0x2e0 net/mac802154/driver-ops.h:127
drv_start+0x4ea/0x1010 net/mac802154/driver-ops.h:167
mac802154_scan_worker+0x8e6/0xe60 net/mac802154/scan.c:248
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 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
Freed by task 0:
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:264 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
__rcu_free_sheaf_prepare+0x12d/0x2a0 mm/slub.c:3009
rcu_free_sheaf+0x31/0x200 mm/slub.c:6061
rcu_do_batch kernel/rcu/tree.c:2650 [inline]
rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
The buggy address belongs to the object at ffff88803149d500
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
64-byte region [ffff88803149d500, ffff88803149d540)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3149d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801c0418c0 dead000000000100 dead000000000122
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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 977, tgid 977 (kworker/u8:7), ts 26471963378
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab+0x7d/0x620 mm/slub.c:3462
new_slab mm/slub.c:3513 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7418
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_node_noprof+0x54d/0x720 mm/slub.c:5426
_kmalloc_node_noprof include/linux/slab.h:1200 [inline]
__vmalloc_area_node mm/vmalloc.c:3893 [inline]
__vmalloc_node_range_noprof+0x5b4/0x1540 mm/vmalloc.c:4104
__vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4165
alloc_thread_stack_node kernel/fork.c:359 [inline]
dup_task_struct+0x2c6/0xa00 kernel/fork.c:930
copy_process+0x7e0/0x4400 kernel/fork.c:2134
kernel_clone+0x2d7/0x940 kernel/fork.c:2771
user_mode_thread+0x115/0x180 kernel/fork.c:2848
call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:169
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
page_owner free stack trace missing
Memory state around the buggy address:
ffff88803149d400: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
ffff88803149d480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88803149d500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88803149d580: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88803149d600: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 0b 8b 02 c3 cc cc or -0x33333cfe(%rbx),%ecx
6: cc int3
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: f3 0f 1e fa endbr64
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d 33 c5 20 00 verw 0x20c533(%rip) # 0x20c55b
28: fb sti
29: f4 hlt
* 2a: e9 8c 08 03 00 jmp 0x308bb <-- trapping instruction
2f: cc int3
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: cc int3
38: cc int3
39: cc int3
3a: cc int3
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
---
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [mm?] KASAN: invalid-free in rcu_free_sheaf
[not found] <CAE2+fR82T2Uy4t5eN-Y_AusnFt2a7E5P5dpyKpJT_0x8dniztg@mail.gmail.com>
@ 2026-07-06 13:36 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2026-07-06 13:36 UTC (permalink / raw)
To: malayarout91; +Cc: malayarout91, linux-kernel, syzkaller-bugs
> Hi,
>
> Please test the following patch.
>
> #syz test
This crash does not have a reproducer. I cannot test it.
>
> diff --git a/drivers/net/ieee802154/mac802154_hwsim.c
> b/drivers/net/ieee802154/mac802154_hwsim.c
> index 6daa0f198b9f..99d52a2323ac 100644
> --- a/drivers/net/ieee802154/mac802154_hwsim.c
> +++ b/drivers/net/ieee802154/mac802154_hwsim.c
> @@ -113,7 +113,8 @@ static int hwsim_update_pib(struct ieee802154_hw
> *hw, u8 page, u8 channel,
> pib->filt_level = filt_level;
>
> rcu_assign_pointer(phy->pib, pib);
> - kfree_rcu(pib_old, rcu);
> + if (pib_old)
> + kfree_rcu(pib_old, rcu);
> return 0;
> }
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-10-17 11:54 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2026-06-12 20:43 [syzbot] [mm?] KASAN: invalid-free in rcu_free_sheaf syzbot
2026-10-17 11:54 ` syzbot
[not found] <CAE2+fR82T2Uy4t5eN-Y_AusnFt2a7E5P5dpyKpJT_0x8dniztg@mail.gmail.com>
2026-07-06 13:36 ` syzbot
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