==================================================================
BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:381 [inline]
BUG: KASAN: slab-use-after-free in waitqueue_active include/linux/wait.h:127 [inline]
BUG: KASAN: slab-use-after-free in wq_has_sleeper include/linux/wait.h:161 [inline]
BUG: KASAN: slab-use-after-free in skwq_has_sleeper include/net/sock.h:2407 [inline]
BUG: KASAN: slab-use-after-free in sock_def_readable+0x1cb/0x550 net/core/sock.c:3613
Read of size 8 at addr ffff88805a2a6cc0 by task udevd/5193

CPU: 1 UID: 0 PID: 5193 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 list_empty include/linux/list.h:381 [inline]
 waitqueue_active include/linux/wait.h:127 [inline]
 wq_has_sleeper include/linux/wait.h:161 [inline]
 skwq_has_sleeper include/net/sock.h:2407 [inline]
 sock_def_readable+0x1cb/0x550 net/core/sock.c:3613
 send_to_lecd+0x3e7/0x830 net/atm/lec.c:559
 lec_arp_expire_arp+0x150/0x280 net/atm/lec.c:-1
 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:228 [inline]
RIP: 0010:unwind_next_frame+0x214/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: ef 08 8b 15 7e 06 b1 0c 8d 42 ff 44 39 f8 0f 86 73 04 00 00 44 89 f8 4c 8d 2c 85 d0 ad 73 91 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 85 1d 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d
RSP: 0018:ffffc90002f975b8 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080000000
RDX: 00000000000ab6ed RSI: ffffffff8c27efe0 RDI: ffffffff8c27efa0
RBP: dffffc0000000000 R08: ffffffff81766536 R09: ffffffff8e95d020
R10: ffffc90002f976d8 R11: ffffffff81b0a9b0 R12: ffffffff8247b97d
R13: ffffffff9178ccb4 R14: ffffc90002f97688 R15: 00000000000147b9
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 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:2685 [inline]
 slab_free mm/slub.c:6165 [inline]
 kfree+0x1c1/0x620 mm/slub.c:6483
 tomoyo_path_perm+0x403/0x560 security/tomoyo/file.c:847
 tomoyo_path_unlink+0xaa/0xf0 security/tomoyo/tomoyo.c:162
 security_path_unlink+0x15f/0x330 security/security.c:1483
 filename_unlinkat+0x349/0x610 fs/namei.c:5565
 __do_sys_unlink fs/namei.c:5603 [inline]
 __se_sys_unlink+0x2e/0x140 fs/namei.c:5600
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca55646937
Code: 00 00 e9 a9 fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 5f 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 91 b4 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffebd923e48 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000558ec6a52e00 RCX: 00007fca55646937
RDX: 0000000000000001 RSI: 0000558eaccd767f RDI: 00007ffebd923e50
RBP: 0000000000000847 R08: 0000000000000064 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffebd923e50
R13: 0000558eaccf2100 R14: 0000000000000001 R15: 00007ffebd924470
 </TASK>

Allocated by task 15579:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885
 sock_alloc_inode+0x2c/0x190 net/socket.c:328
 alloc_inode+0x6a/0x1b0 fs/inode.c:345
 new_inode_pseudo include/linux/fs.h:3014 [inline]
 sock_alloc net/socket.c:697 [inline]
 __sock_create+0x12d/0x9d0 net/socket.c:1628
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0xd6/0x1b0 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1818
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15627:
 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:2685 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x180/0x630 mm/slub.c:6295
 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
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3131 [inline]
 call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
 destroy_inode fs/inode.c:399 [inline]
 evict+0x95b/0xb10 fs/inode.c:865
 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670
 finish_dput+0xc9/0x480 fs/dcache.c:879
 __fput+0x691/0xa60 fs/file_table.c:518
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __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:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88805a2a6c00
 which belongs to the cache sock_inode_cache of size 1408
The buggy address is located 192 bytes inside of
 freed 1408-byte region [ffff88805a2a6c00, ffff88805a2a7180)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805a2a2a00 pfn:0x5a2a0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88805a2a7e01
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801def0c80 ffff88801d2d8dc8 ffffea00016fa210
raw: ffff88805a2a2a00 0000000800150012 00000000f5000000 ffff88805a2a7e01
head: 00fff00000000240 ffff88801def0c80 ffff88801d2d8dc8 ffffea00016fa210
head: ffff88805a2a2a00 0000000800150012 00000000f5000000 ffff88805a2a7e01
head: 00fff00000000003 ffffea000168a801 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 Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 11257, tgid 11254 (syz.4.1352), ts 250317508436, free_ts 232665750623
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 kmem_cache_alloc_lru_noprof+0x37c/0x640 mm/slub.c:4885
 sock_alloc_inode+0x2c/0x190 net/socket.c:328
 alloc_inode+0x6a/0x1b0 fs/inode.c:345
 new_inode_pseudo include/linux/fs.h:3014 [inline]
 sock_alloc net/socket.c:697 [inline]
 __sock_create+0x12d/0x9d0 net/socket.c:1628
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0xd6/0x1b0 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1818
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5487 tgid 5487 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
 __slab_free+0x263/0x2b0 mm/slub.c:5573
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_node_track_caller_noprof+0x493/0x7b0 mm/slub.c:5368
 kmalloc_reserve net/core/skbuff.c:635 [inline]
 __alloc_skb+0x2c1/0x7d0 net/core/skbuff.c:713
 alloc_skb include/linux/skbuff.h:1383 [inline]
 alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6734
 sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:2998
 unix_dgram_sendmsg+0x460/0x18d0 net/unix/af_unix.c:2131
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 sock_write_iter+0x49b/0x4f0 net/socket.c:1254
 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
 vfs_writev+0x33c/0x990 fs/read_write.c:1059
 do_writev+0x154/0x2e0 fs/read_write.c:1105
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88805a2a6b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805a2a6c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805a2a6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88805a2a6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805a2a6d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	ef                   	out    %eax,(%dx)
   1:	08 8b 15 7e 06 b1    	or     %cl,-0x4ef981eb(%rbx)
   7:	0c 8d                	or     $0x8d,%al
   9:	42 ff 44 39 f8       	incl   -0x8(%rcx,%r15,1)
   e:	0f 86 73 04 00 00    	jbe    0x487
  14:	44 89 f8             	mov    %r15d,%eax
  17:	4c 8d 2c 85 d0 ad 73 	lea    -0x6e8c5230(,%rax,4),%r13
  1e:	91
  1f:	4c 89 e8             	mov    %r13,%rax
  22:	48 c1 e8 03          	shr    $0x3,%rax
  26:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	48 89 eb             	mov    %rbp,%rbx
  2f:	0f 85 85 1d 00 00    	jne    0x1dba
  35:	45 8b 6d 00          	mov    0x0(%r13),%r13d
  39:	44 89 f8             	mov    %r15d,%eax
  3c:	ff c0                	inc    %eax
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d