==================================================================
BUG: KASAN: double-free in rcu_free_sheaf+0x31/0x200 mm/slub.c:6060
Free of addr ffff8880335a1c80 by task syz.0.189/6740
CPU: 1 UID: 0 PID: 6740 Comm: syz.0.189 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
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:2693 [inline]
__rcu_free_sheaf_prepare+0x10a/0x2a0 mm/slub.c:3009
rcu_free_sheaf+0x31/0x200 mm/slub.c:6060
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
RIP: 0010:kasan_disable_current+0xc/0x20 mm/kasan/common.c:91
Code: c3 cc cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 05 3c f7 5d 11 88 00 17 00 00 e9 89 70 b2 09 cc 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90005707778 EFLAGS: 00000282
RAX: ffff888022f65dc0 RBX: ffff888140411640 RCX: 0000000029d32a81
RDX: ffffea0000d500c0 RSI: ffffffff8c6dac60 RDI: ffff888029d32a80
RBP: ffffc90005707920 R08: ffff8880354036c3 R09: 1ffff11006a806d8
R10: dffffc0000000000 R11: ffffed1006a806d9 R12: ffff888029d32a80
R13: 0000000000000001 R14: ffffea0000d500c0 R15: ffffffff8221569f
memcg_slab_free_hook mm/slub.c:2547 [inline]
slab_free mm/slub.c:6505 [inline]
kmem_cache_free+0x378/0x650 mm/slub.c:6635
tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
exit_mmap+0x4ca/0x9f0 mm/mmap.c:1335
__mmput+0x118/0x420 kernel/fork.c:1193
exit_mm+0x221/0x2d0 kernel/exit.c:618
do_exit+0x6cd/0x2360 kernel/exit.c:1000
do_group_exit+0x22d/0x2f0 kernel/exit.c:1155
get_signal+0x121b/0x12c0 kernel/signal.c:3112
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3fafd9e159
Code: Unable to access opcode bytes at 0x7f3fafd9e12f.
RSP: 002b:00007f3fb0ce20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3fb0026098 RCX: 00007f3fafd9e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3fb0026098
RBP: 00007f3fb0026090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fb0026128 R14: 00007ffda610b830 R15: 00007ffda610b918
Allocated by task 50:
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+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 6740:
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:2748 [inline]
__rcu_free_sheaf_prepare+0x12d/0x2a0 mm/slub.c:3009
rcu_free_sheaf+0x31/0x200 mm/slub.c:6060
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 ffff8880335a1c80
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
64-byte region [ffff8880335a1c80, ffff8880335a1cc0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880335a1f80 pfn:0x335a1
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801b0418c0 ffffea0000c8d210 ffffea0001f3fe90
raw: ffff8880335a1f80 0000000000200014 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 37, tgid 37 (kworker/u8:2), ts 24686857740
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:7417
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:2133
kernel_clone+0x2d7/0x940 kernel/fork.c:2769
user_mode_thread+0x115/0x180 kernel/fork.c:2846
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:
ffff8880335a1b80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
ffff8880335a1c00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff8880335a1c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff8880335a1d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880335a1d80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c3 ret
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
d: 00
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: 90 nop
1c: 90 nop
1d: 90 nop
1e: f3 0f 1e fa endbr64
22: 65 48 8b 05 3c f7 5d mov %gs:0x115df73c(%rip),%rax # 0x115df766
29: 11
* 2a: ff 88 00 17 00 00 decl 0x1700(%rax) <-- trapping instruction
30: e9 89 70 b2 09 jmp 0x9b270be
35: cc int3
36: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
3d: 00
3e: 90 nop
3f: 90 nop