==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_write include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
BUG: KASAN: slab-use-after-free in cpumask_clear_cpu include/linux/cpumask.h:628 [inline]
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x23d/0x6c0 arch/x86/mm/tlb.c:1132
Write of size 8 at addr ffff88807d1c1f80 by task syz-executor/27604
CPU: 0 UID: 0 PID: 27604 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250630-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
instrument_atomic_write include/linux/instrumented.h:82 [inline]
clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
cpumask_clear_cpu include/linux/cpumask.h:628 [inline]
flush_tlb_func+0x23d/0x6c0 arch/x86/mm/tlb.c:1132
csd_do_func kernel/smp.c:134 [inline]
__flush_smp_call_function_queue+0x370/0xaa0 kernel/smp.c:540
__sysvec_call_function_single+0xa8/0x3d0 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x9e/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:console_flush_all+0x7f7/0xc40 kernel/printk/printk.c:3227
Code: 48 21 c3 0f 85 e9 01 00 00 e8 65 2d 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 56 2d 1f 00 eb 06 e8 4f 2d 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 3a 41 83 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc9000bc766c0 EFLAGS: 00000293
RAX: 1ffffffff1d78deb RBX: ffffffff8ebc6f58 RCX: ffff888073eada00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000bc76810 R08: ffffffff8fc29737 R09: 1ffffffff1f852e6
R10: dffffc0000000000 R11: fffffbfff1f852e7 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8ebc6f00
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
netdev_info+0x10a/0x160 net/core/dev.c:12605
bond_enslave+0x2d8a/0x3a20 drivers/net/bonding/bond_main.c:2408
do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2946
do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3148
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
__sys_sendto+0x3bd/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d5b1907bc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffc077cd000 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9d5bee4620 RCX: 00007f9d5b1907bc
RDX: 0000000000000028 RSI: 00007f9d5bee4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc077cd054 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f9d5bee4670 R15: 0000000000000000
Allocated by task 24947:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236
dup_mm kernel/fork.c:1466 [inline]
copy_mm+0xdb/0x4b0 kernel/fork.c:1528
copy_process+0x1706/0x3c00 kernel/fork.c:2168
kernel_clone+0x21e/0x870 kernel/fork.c:2598
__do_sys_clone kernel/fork.c:2741 [inline]
__se_sys_clone kernel/fork.c:2725 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2725
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 28115:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2417 [inline]
slab_free mm/slub.c:4680 [inline]
kmem_cache_free+0x18f/0x400 mm/slub.c:4782
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x648/0x2300 kernel/exit.c:947
do_group_exit+0x21c/0x2d0 kernel/exit.c:1100
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88807d1c1580
which belongs to the cache mm_struct of size 2584
The buggy address is located 2560 bytes inside of
freed 2584-byte region [ffff88807d1c1580, ffff88807d1c1f98)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807d1c5600 pfn:0x7d1c0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888059bf3201
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a84bb40 0000000000000000 dead000000000001
raw: ffff88807d1c5600 00000000800b0009 00000000f5000000 ffff888059bf3201
head: 00fff00000000040 ffff88801a84bb40 0000000000000000 dead000000000001
head: ffff88807d1c5600 00000000800b0009 00000000f5000000 ffff888059bf3201
head: 00fff00000000003 ffffea0001f47001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 10774, tgid 10774 (syz-executor), ts 411314468518, free_ts 411254105797
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1848
prep_new_page mm/page_alloc.c:1856 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3855
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5145
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2655
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4236
dup_mm kernel/fork.c:1466 [inline]
copy_mm+0xdb/0x4b0 kernel/fork.c:1528
copy_process+0x1706/0x3c00 kernel/fork.c:2168
kernel_clone+0x21e/0x870 kernel/fork.c:2598
__do_sys_clone kernel/fork.c:2741 [inline]
__se_sys_clone kernel/fork.c:2725 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2725
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 50 tgid 50 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1392 [inline]
__free_frozen_pages+0xb80/0xd80 mm/page_alloc.c:2892
discard_slab mm/slub.c:2753 [inline]
__put_partials+0x156/0x1a0 mm/slub.c:3218
put_cpu_partial+0x17c/0x250 mm/slub.c:3293
__slab_free+0x2d5/0x3c0 mm/slub.c:4550
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236
skb_clone+0x212/0x3a0 net/core/skbuff.c:2050
hci_event_packet+0x3f4/0x1200 net/bluetooth/hci_event.c:7520
hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4068
process_one_work kernel/workqueue.c:3239 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88807d1c1e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807d1c1f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807d1c1f80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88807d1c2000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88807d1c2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 21 c3 and %rax,%rbx
3: 0f 85 e9 01 00 00 jne 0x1f2
9: e8 65 2d 1f 00 call 0x1f2d73
e: 48 8b 5c 24 20 mov 0x20(%rsp),%rbx
13: 4d 85 f6 test %r14,%r14
16: 75 07 jne 0x1f
18: e8 56 2d 1f 00 call 0x1f2d73
1d: eb 06 jmp 0x25
1f: e8 4f 2d 1f 00 call 0x1f2d73
24: fb sti
25: 48 8b 44 24 28 mov 0x28(%rsp),%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 3a 41 83 00 call 0x834173
39: 48 8b 1b mov (%rbx),%rbx
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 44 rex.R
3f: 24 .byte 0x24