==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88807567f02a by task syz.7.2714/16803

CPU: 0 PID: 16803 Comm: syz.7.2714 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x220 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline]
RIP: 0010:kasan_check_range+0x18/0x290 mm/kasan/generic.c:187
Code: ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc 66 0f 1f 00 b0 01 48 85 f6 0f 84 b8 01 00 00 55 41 57 41 56 41 55 41 54 <53> 4c 8d 04 37 49 39 f8 0f 82 5a 02 00 00 49 89 f9 49 c1 e9 2f 41
RSP: 0018:ffffc9000b7bfb30 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81678a9b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e4a84e8
RBP: ffffc9000b7bfc70 R08: dffffc0000000000 R09: 1ffffffff21b46aa
R10: dffffc0000000000 R11: fffffbfff21b46ab R12: ffffffff81c8efea
R13: dffffc0000000000 R14: 00002000000000c0 R15: 1ffff920016f7f78
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:504 [inline]
 cpu_online include/linux/cpumask.h:1082 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xab/0x8b0 kernel/locking/lockdep.c:5765
 do_recvmmsg+0x389/0x7d0 net/socket.c:2956
 __sys_recvmmsg net/socket.c:3029 [inline]
 __do_sys_recvmmsg net/socket.c:3052 [inline]
 __se_sys_recvmmsg net/socket.c:3045 [inline]
 __x64_sys_recvmmsg+0x191/0x240 net/socket.c:3045
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcbe8d8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcbe9cb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fcbe8fb6090 RCX: 00007fcbe8d8ebe9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fcbe8e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbe8fb6128 R14: 00007fcbe8fb6090 R15: 00007fffb2186fe8
 </TASK>

Allocated by task 16671:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xb4/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 copy_splice_read+0x138/0x860 fs/splice.c:338
 splice_direct_to_actor+0x25c/0x870 fs/splice.c:1069
 do_splice_direct+0x1b7/0x2c0 fs/splice.c:1194
 generic_copy_file_range fs/read_write.c:1392 [inline]
 vfs_copy_file_range+0xa96/0x15e0 fs/read_write.c:1538
 __do_sys_copy_file_range fs/read_write.c:1595 [inline]
 __se_sys_copy_file_range+0x321/0x490 fs/read_write.c:1558
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 16671:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1806 [inline]
 slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
 slab_free mm/slub.c:3816 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3829
 copy_splice_read+0x76b/0x860 fs/splice.c:398
 splice_direct_to_actor+0x25c/0x870 fs/splice.c:1069
 do_splice_direct+0x1b7/0x2c0 fs/splice.c:1194
 generic_copy_file_range fs/read_write.c:1392 [inline]
 vfs_copy_file_range+0xa96/0x15e0 fs/read_write.c:1538
 __do_sys_copy_file_range fs/read_write.c:1595 [inline]
 __se_sys_copy_file_range+0x321/0x490 fs/read_write.c:1558
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88807567f000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88807567f000, ffff88807567f200)

The buggy address belongs to the physical page:
page:ffffea0001d59f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7567c
head:ffffea0001d59f00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 14193, tgid 14192 (syz.7.1998), ts 884935655271, free_ts 871421092803
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 alloc_slab_page+0x5d/0x170 mm/slub.c:1876
 allocate_slab mm/slub.c:2023 [inline]
 new_slab+0x87/0x2e0 mm/slub.c:2076
 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
 __slab_alloc mm/slub.c:3329 [inline]
 __slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc_node mm/slub.c:3475 [inline]
 __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0xa4/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 copy_splice_read+0x138/0x860 fs/splice.c:338
 splice_direct_to_actor+0x25c/0x870 fs/splice.c:1069
 do_splice_direct+0x1b7/0x2c0 fs/splice.c:1194
 do_sendfile+0x5dc/0xf70 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64+0x13f/0x190 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 __free_pages_ok+0x9b3/0xad0 mm/page_alloc.c:1284
 io_pages_unmap+0x1c4/0x300 io_uring/io_uring.c:2687
 io_rings_free+0x86/0x3d0 io_uring/io_uring.c:2794
 io_ring_ctx_free+0x730/0x930 io_uring/io_uring.c:3039
 io_ring_exit_work+0x76d/0x7e0 io_uring/io_uring.c:3263
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Memory state around the buggy address:
 ffff88807567ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807567ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807567f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88807567f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807567f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	ff c3                	inc    %ebx
   2:	0f 0b                	ud2
   4:	b8 ea ff ff ff       	mov    $0xffffffea,%eax
   9:	c3                   	ret
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	66 0f 1f 00          	nopw   (%rax)
  16:	b0 01                	mov    $0x1,%al
  18:	48 85 f6             	test   %rsi,%rsi
  1b:	0f 84 b8 01 00 00    	je     0x1d9
  21:	55                   	push   %rbp
  22:	41 57                	push   %r15
  24:	41 56                	push   %r14
  26:	41 55                	push   %r13
  28:	41 54                	push   %r12
* 2a:	53                   	push   %rbx <-- trapping instruction
  2b:	4c 8d 04 37          	lea    (%rdi,%rsi,1),%r8
  2f:	49 39 f8             	cmp    %rdi,%r8
  32:	0f 82 5a 02 00 00    	jb     0x292
  38:	49 89 f9             	mov    %rdi,%r9
  3b:	49 c1 e9 2f          	shr    $0x2f,%r9
  3f:	41                   	rex.B