syzbot

==================================================================
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 ffff88805937aa40 by task pool_workqueue_/3

CPU: 1 UID: 0 PID: 3 Comm: pool_workqueue_ Not tainted 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 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
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7019
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 cb bf 18 f6 e8 f6 f0 4f f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90000087aa0 EFLAGS: 00000286
RAX: 9ab10635056b5100 RBX: 0000000000000000 RCX: 9ab10635056b5100
RDX: 0000000000000000 RSI: ffffffff8da6993f RDI: 0000000000000001
RBP: ffffc90000087b40 R08: ffffffff8fc29e37 R09: 1ffffffff1f853c6
R10: dffffc0000000000 R11: fffffbfff1f853c7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000010f54
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:196
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lockdep_unregister_key+0x2c5/0x310 kernel/locking/lockdep.c:6619
Code: 65 48 8b 05 1d a3 25 11 48 3b 44 24 10 0f 84 26 fe ff ff e8 4d 8e d8 09 e8 78 8f d8 09 41 f7 c7 00 02 00 00 74 bd fb 40 84 ed <75> bc eb cd 90 0f 0b 90 e9 19 ff ff ff 90 0f 0b 90 e9 2a ff ff ff
RSP: 0018:ffffc90000087c00 EFLAGS: 00000202
RAX: 9ab10635056b5100 RBX: 0000000000000000 RCX: 9ab10635056b5100
RDX: ffffffff93876358 RSI: ffffffff8da7d37d RDI: ffffffff8be4b100
RBP: ffff88805669a901 R08: 0000000000000000 R09: ffffffff81aafe18
R10: dffffc0000000000 R11: fffffbfff1f853c7 R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: 0000000000000a02
 wq_unregister_lockdep kernel/workqueue.c:4819 [inline]
 pwq_release_workfn+0x6d5/0x870 kernel/workqueue.c:5115
 kthread_worker_fn+0x507/0xb60 kernel/kthread.c:1009
 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
 </TASK>

Allocated by task 20317:
 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 21696:
 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
 __do_sys_exit_group kernel/exit.c:1111 [inline]
 __se_sys_exit_group kernel/exit.c:1109 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1109
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 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

The buggy address belongs to the object at ffff88805937a040
 which belongs to the cache mm_struct of size 2584
The buggy address is located 2560 bytes inside of
 freed 2584-byte region [ffff88805937a040, ffff88805937aa58)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59378
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88805b923001
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a84bb40 ffffea00015f9200 dead000000000003
raw: 0000000000000000 00000000000b000b 00000000f5000000 ffff88805b923001
head: 00fff00000000040 ffff88801a84bb40 ffffea00015f9200 dead000000000003
head: 0000000000000000 00000000000b000b 00000000f5000000 ffff88805b923001
head: 00fff00000000003 ffffea000164de01 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 5976, tgid 5976 (syz-executor), ts 334332223266, free_ts 334272013616
 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 5903 tgid 5903 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]
 __do_kmalloc_node mm/slub.c:4364 [inline]
 __kmalloc_noprof+0x224/0x4f0 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path2_perm+0x288/0x680 security/tomoyo/file.c:923
 tomoyo_path_rename+0x141/0x190 security/tomoyo/tomoyo.c:300
 security_path_rename+0x250/0x490 security/security.c:2026
 do_renameat2+0x52b/0xa80 fs/namei.c:5265
 __do_sys_rename fs/namei.c:5325 [inline]
 __se_sys_rename fs/namei.c:5323 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5323
 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

Memory state around the buggy address:
 ffff88805937a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805937a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805937aa00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
                                           ^
 ffff88805937aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805937ab00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	24 20                	and    $0x20,%al
   2:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
   7:	74 0c                	je     0x15
   9:	90                   	nop
   a:	0f 0b                	ud2
   c:	48 f7 03 08 00 00 00 	testq  $0x8,(%rbx)
  13:	74 64                	je     0x79
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 cb bf 18 f6       	call   0xf618bfea
  1f:	e8 f6 f0 4f f6       	call   0xf64ff11a
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 1b ab ff ff       	call   0xffffab4a <-- trapping instruction
  2f:	48 c7 44 24 40 00 00 	movq   $0x0,0x40(%rsp)
  36:	00 00
  38:	9c                   	pushf
  39:	8f 44 24 40          	pop    0x40(%rsp)
  3d:	8b                   	.byte 0x8b
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24