==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff888060daf02a by task syz.7.3433/18954

CPU: 1 UID: 0 PID: 18954 Comm: syz.7.3433 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xb4/0x290 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
 expire_timers kernel/time/timer.c:1840 [inline]
 __run_timers kernel/time/timer.c:2414 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
 run_timer_base kernel/time/timer.c:2435 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pte_none arch/x86/include/asm/pgtable.h:993 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1673 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1731 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1823 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1852 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1873 [inline]
RIP: 0010:unmap_page_range+0xaac/0x4210 mm/memory.c:1894
Code: 89 e7 e8 b7 0a 19 00 4d 8b 2c 24 4c 89 6c 24 60 4c 8b 7c 24 50 49 29 df 49 c1 ef 0c 4c 89 ee 48 83 e6 9f 31 ff e8 74 1a b7 ff <4c> 89 e8 48 83 e0 9f 4c 89 7c 24 30 74 1e e8 81 15 b7 ff 48 c7 84
RSP: 0018:ffffc9000a83f640 EFLAGS: 00000293
RAX: ffffffff8208aabc RBX: 00007f2a814ac000 RCX: ffff888026ba9e00
RDX: 0000000000000000 RSI: 8000000059622007 RDI: 0000000000000000
RBP: ffffc9000a83f8d0 R08: ffffea0001658873 R09: 1ffffd40002cb10e
R10: dffffc0000000000 R11: fffff940002cb10f R12: ffff88806ddcb560
R13: 8000000059622007 R14: dffffc0000000000 R15: 0000000000000154
 unmap_vmas+0x25d/0x3c0 mm/memory.c:1984
 exit_mmap+0x245/0xba0 mm/mmap.c:1284
 __mmput+0x118/0x420 kernel/fork.c:1379
 exit_mm+0x1da/0x2c0 kernel/exit.c:589
 do_exit+0x859/0x2550 kernel/exit.c:940
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a8258e969
Code: Unable to access opcode bytes at 0x7f2a8258e93f.
RSP: 002b:00007ffc307fcef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2a8258e969
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc307fcf5c R08: 00000008307fcfef R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000250
R13: 00000000000927c0 R14: 0000000000094a75 R15: 00007ffc307fcfb0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x60daf
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 00000000ffffffff 0000000000000000
raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), pid 11588, tgid 11588 (syz-executor), ts 604299561673, free_ts 604419632002
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2392
 pagetable_alloc_noprof include/linux/mm.h:3002 [inline]
 __pgd_alloc_noprof include/asm-generic/pgalloc.h:270 [inline]
 _pgd_alloc arch/x86/mm/pgtable.c:383 [inline]
 pgd_alloc+0x3f/0x280 arch/x86/mm/pgtable.c:398
 mm_alloc_pgd kernel/fork.c:785 [inline]
 mm_init+0x5e1/0xf10 kernel/fork.c:1322
 dup_mm kernel/fork.c:1730 [inline]
 copy_mm+0x1ba/0x2100 kernel/fork.c:1786
 copy_process+0x16d3/0x3b80 kernel/fork.c:2429
 kernel_clone+0x21e/0x870 kernel/fork.c:2844
 __do_sys_clone kernel/fork.c:2987 [inline]
 __se_sys_clone kernel/fork.c:2971 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2971
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 18821 tgid 18819 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 __free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
 mm_free_pgd kernel/fork.c:793 [inline]
 __mmdrop+0xb5/0x460 kernel/fork.c:939
 exit_mm+0x1da/0x2c0 kernel/exit.c:589
 do_exit+0x859/0x2550 kernel/exit.c:940
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 get_signal+0x125e/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218
 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888060daef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888060daef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888060daf000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888060daf080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888060daf100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
----------------
Code disassembly (best guess):
   0:	89 e7                	mov    %esp,%edi
   2:	e8 b7 0a 19 00       	call   0x190abe
   7:	4d 8b 2c 24          	mov    (%r12),%r13
   b:	4c 89 6c 24 60       	mov    %r13,0x60(%rsp)
  10:	4c 8b 7c 24 50       	mov    0x50(%rsp),%r15
  15:	49 29 df             	sub    %rbx,%r15
  18:	49 c1 ef 0c          	shr    $0xc,%r15
  1c:	4c 89 ee             	mov    %r13,%rsi
  1f:	48 83 e6 9f          	and    $0xffffffffffffff9f,%rsi
  23:	31 ff                	xor    %edi,%edi
  25:	e8 74 1a b7 ff       	call   0xffb71a9e
* 2a:	4c 89 e8             	mov    %r13,%rax <-- trapping instruction
  2d:	48 83 e0 9f          	and    $0xffffffffffffff9f,%rax
  31:	4c 89 7c 24 30       	mov    %r15,0x30(%rsp)
  36:	74 1e                	je     0x56
  38:	e8 81 15 b7 ff       	call   0xffb715be
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7
  3f:	84                   	.byte 0x84