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ODEBUG: free active (active state 0) object: ffff88802d8aa090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 0 PID: 17664 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 0 PID: 17664 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 0 PID: 17664 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 0 PID: 17664 Comm: syz.2.2576 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 60 8f 1c 8b 48 c7 c6 c0 8b 1c 8b 48 c7 c2 e0 90 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 5e fe 1f fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 73 4b 5a
RSP: 0018:ffffc90000007a50 EFLAGS: 00010296
RAX: edfcf95997a12400 RBX: ffffffff97569e68 RCX: ffff88801e6d8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab80 R08: ffffc90000007647 R09: 1ffff92000000ec8
R10: dffffc0000000000 R11: fffff52000000ec9 R12: ffff88802d8aa200
R13: ffffffff8979eb80 R14: ffff88802d8aa000 R15: ffff88802d8aa090
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbcf4be9e80 CR3: 000000000cf32000 CR4: 00000000003526f0
Call Trace:
slab_free_hook mm/slub.c:1786 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4c6/0x5f0 net/rose/rose_timer.c:183
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
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+0xd3/0x190 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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x60 kernel/kcov.c:216
Code: 89 fb e8 13 00 00 00 48 8b 3d bc d4 03 0d 48 89 de 5b e9 33 5f 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 50 99 7c 7e <65> 8b 15 51 99 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc900056dedf0 EFLAGS: 00000246
RAX: ffffffff813b3750 RBX: 1ffff92000adbdd9 RCX: ffff88801e6d8000
RDX: ffff88801e6d8000 RSI: 0000000000000001 RDI: ffffffff813b36de
RBP: ffffc900056def18 R08: ffffc900056def90 R09: 000000000000000a
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc900056deec8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff81eee0f5
unwind_next_frame+0x130/0x2970 arch/x86/kernel/unwind_orc.c:482
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2504
release_pages+0x1f7a/0x2200 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x630/0x1b20 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x245/0x9e0 mm/shmem.c:1264
evict+0x4ca/0x8d0 fs/inode.c:705
__dentry_kill+0x431/0x650 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
__fput+0x5e5/0x970 fs/file_table.c:392
task_work_run+0x1d4/0x260 kernel/task_work.c:245
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x95a/0x2460 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x13f0 kernel/signal.c:2902
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fbcf4b9c7a1
Code: Unable to access opcode bytes at 0x7fbcf4b9c777.
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fbcf4e16090 RCX: 00007fbcf4b9c799
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007fbcf4c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fbcf4e16128 R14: 00007fbcf4e16090 R15: 00007ffe36877d78
----------------
Code disassembly (best guess):
0: 89 fb mov %edi,%ebx
2: e8 13 00 00 00 call 0x1a
7: 48 8b 3d bc d4 03 0d mov 0xd03d4bc(%rip),%rdi # 0xd03d4ca
e: 48 89 de mov %rbx,%rsi
11: 5b pop %rbx
12: e9 33 5f 57 00 jmp 0x575f4a
17: cc int3
18: cc int3
19: cc int3
1a: f3 0f 1e fa endbr64
1e: 48 8b 04 24 mov (%rsp),%rax
22: 65 48 8b 0d 50 99 7c mov %gs:0x7e7c9950(%rip),%rcx # 0x7e7c997a
29: 7e
* 2a: 65 8b 15 51 99 7c 7e mov %gs:0x7e7c9951(%rip),%edx # 0x7e7c9982 <-- trapping instruction
31: 81 e2 00 01 ff 00 and $0xff0100,%edx
37: 74 11 je 0x4a
39: 81 fa 00 01 00 00 cmp $0x100,%edx
3f: 75 .byte 0x75