------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: rose_transmit_restart_request net/rose/rose_link.c:-1 [inline]
ODEBUG: free active (active state 0) object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:284
WARNING: CPU: 1 PID: 9115 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 9115 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
WARNING: CPU: 1 PID: 9115 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Modules linked in:
CPU: 1 PID: 9115 Comm: syz.3.1014 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:979 [inline]
RIP: 0010:debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Code: ef e8 48 cc bd fd 4c 8b 45 00 48 c7 c7 c0 18 df 8a 48 c7 c6 80 15 df 8a 48 c7 c2 20 1a df 8a 8b 0c 24 4d 89 e9 e8 34 52 38 fd <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 a5 7a 0a
RSP: 0018:ffffc900001e0a10 EFLAGS: 00010246
RAX: 7d55832aad7b0f00 RBX: ffffffff96e60458 RCX: ffff88801d278000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8a8def40 R08: ffffc900001e0687 R09: 1ffff9200003c0d0
R10: dffffc0000000000 R11: fffff5200003c0d1 R12: ffff8880581f6e00
R13: ffffffff892aadc0 R14: ffff8880581f6000 R15: ffff8880581f6c90
FS: 00007f2b8b8136c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000009000 CR3: 00000000788c4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
slab_free_hook mm/slub.c:1704 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4a7/0x5d0 net/rose/rose_timer.c:183
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4e a0 2d f7 48 89 df e8 96 68 2e f7 e8 c1 bc 51 f7 fb bf 01 00 00 00 86 cb 21 f7 65 8b 05 47 50 cb 75 85 c0 74 02 5b c3 e8 94 64 c9
RSP: 0018:ffffc90003276d50 EFLAGS: 00000282
RAX: 7d55832aad7b0f00 RBX: ffff888054b6c290 RCX: 7d55832aad7b0f00
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: 0000000000000001
RBP: ffffc90003276ee0 R08: ffffffff90af62e7 R09: 1ffffffff215ec5c
R10: dffffc0000000000 R11: fffffbfff215ec5d R12: ffffea000114f548
R13: 00000003fffffffc R14: 0000000000000cc0 R15: dffffc0000000000
spin_unlock_irq include/linux/spinlock.h:401 [inline]
shmem_add_to_page_cache+0xa91/0x1c50 mm/shmem.c:740
shmem_get_folio_gfp+0x158e/0x3400 mm/shmem.c:1971
shmem_get_folio mm/shmem.c:2072 [inline]
shmem_write_begin+0xee/0x3f0 mm/shmem.c:2556
generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862
__generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989
__kernel_write_iter+0x285/0x650 fs/read_write.c:517
dump_emit_page fs/coredump.c:950 [inline]
dump_user_range+0x412/0x850 fs/coredump.c:977
elf_core_dump+0x30a6/0x35d0 fs/binfmt_elf.c:2354
do_coredump+0x165b/0x22f0 fs/coredump.c:824
get_signal+0x10aa/0x1350 kernel/signal.c:2857
arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
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+0x5/0x30 kernel/entry/common.c:316
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1485
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f2b8a99c7a1
Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f2b8ac16180 RCX: 00007f2b8a99c799
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f2b8aa32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f2b8ac16218 R14: 00007f2b8ac16180 R15: 00007ffc42894b98
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 66 90 add %ah,-0x70(%rsi)
5: 53 push %rbx
6: 48 89 fb mov %rdi,%rbx
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 4e a0 2d f7 call 0xf72da065
17: 48 89 df mov %rbx,%rdi
1a: e8 96 68 2e f7 call 0xf72e68b5
1f: e8 c1 bc 51 f7 call 0xf751bce5
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 86 cb 21 f7 call 0xf721cbb5 <-- trapping instruction
2f: 65 8b 05 47 50 cb 75 mov %gs:0x75cb5047(%rip),%eax # 0x75cb507d
36: 85 c0 test %eax,%eax
38: 74 02 je 0x3c
3a: 5b pop %rbx
3b: c3 ret
3c: e8 .byte 0xe8
3d: 94 xchg %eax,%esp
3e: 64 c9 fs leave