------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88805bdd9c90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x560 net/rose/rose_link.c:-1
WARNING: lib/debugobjects.c:632 at debug_print_object lib/debugobjects.c:629 [inline], CPU#0: syz.6.4738/30888
WARNING: lib/debugobjects.c:632 at __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline], CPU#0: syz.6.4738/30888
WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1146, CPU#0: syz.6.4738/30888
Modules linked in:
CPU: 0 UID: 0 PID: 30888 Comm: syz.6.4738 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:debug_print_object lib/debugobjects.c:629 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1146
Code: 89 44 24 20 e8 c7 2b 77 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 40 b1 27 8c 48 c7 c2 c0 b6 27 8c 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc90000007b68 EFLAGS: 00010246
RAX: ffffffff8a95fe30 RBX: ffffffff9a4a25c0 RCX: 0000000000000000
RDX: ffffffff8c27b6c0 RSI: ffffffff8c27b140 RDI: ffffffff901c5a20
RBP: ffffffff8bcf3c40 R08: ffff88805bdd9c90 R09: ffffffff8bcf4f60
R10: dffffc0000000000 R11: ffffffff81b1ec80 R12: ffff88805bdd9e00
R13: ffffffff901c5a20 R14: ffff88805bdd9000 R15: ffff88805bdd9c90
FS: 00007fea790066c0(0000) GS:ffff888125460000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30999b CR3: 000000007ea5a000 CR4: 00000000003526f0
Call Trace:
slab_free_hook mm/slub.c:2618 [inline]
slab_free mm/slub.c:6124 [inline]
kfree+0x13a/0x630 mm/slub.c:6442
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
handle_softirqs+0x22a/0x870 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 74 1d 55 0c 48 89 de 5b e9 63 78 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 98 5d 56 11 65 8b 15 b9 5d 56 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90004d27638 EFLAGS: 00000246
RAX: ffffffff820b1ecd RBX: ffff88805b21a3c0 RCX: ffff8880232f0000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004d27748 R08: ffff8880232f0000 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88805b21a3d0 R15: ffff88805b21a3e0
shmem_get_folio_gfp+0x44d/0x1670 mm/shmem.c:2543
shmem_fault+0x179/0x390 mm/shmem.c:2768
__do_fault+0x138/0x390 mm/memory.c:5364
do_read_fault mm/memory.c:5799 [inline]
do_fault mm/memory.c:5933 [inline]
do_pte_missing+0x228f/0x3750 mm/memory.c:4477
handle_pte_fault mm/memory.c:6317 [inline]
__handle_mm_fault mm/memory.c:6455 [inline]
handle_mm_fault+0x1bec/0x3310 mm/memory.c:6624
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x165b/0x29d0 mm/gup.c:1428
populate_vma_page_range+0x2be/0x3c0 mm/gup.c:1860
__mm_populate+0x25f/0x390 mm/gup.c:1963
mm_populate include/linux/mm.h:3899 [inline]
vm_mmap_pgoff+0x3aa/0x4f0 mm/util.c:586
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea7819bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea79006028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fea78415fa0 RCX: 00007fea7819bf79
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fea782327e0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea78416038 R14: 00007fea78415fa0 R15: 00007ffe4e743b08
----------------
Code disassembly (best guess):
0: 89 44 24 20 mov %eax,0x20(%rsp)
4: e8 c7 2b 77 fd call 0xfd772bd0
9: 48 8b 44 24 20 mov 0x20(%rsp),%rax
e: 4c 8b 4d 00 mov 0x0(%rbp),%r9
12: 4c 89 ef mov %r13,%rdi
15: 48 c7 c6 40 b1 27 8c mov $0xffffffff8c27b140,%rsi
1c: 48 c7 c2 c0 b6 27 8c mov $0xffffffff8c27b6c0,%rdx
23: 8b 0c 24 mov (%rsp),%ecx
26: 4d 89 f8 mov %r15,%r8
29: 50 push %rax
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: 4c 8b 6c 24 18 mov 0x18(%rsp),%r13
38: 48 rex.W
39: b9 00 00 00 00 mov $0x0,%ecx
3e: 00 fc add %bh,%ah