------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 0 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc1-syzkaller-00381-g2a130b7e1fcd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 d8 15 fe fc 84 db 0f 85 66 ff ff ff e8 eb 13 fe fc c6 05 22 8c b8 0b 01 90 48 c7 c7 c0 4d d1 8b e8 97 02 bf fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 c8 13 fe fc 0f b6 1d fd 8b b8 0b 31
RSP: 0000:ffffc90000007c38 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814e71a9
RDX: ffffffff8de957c0 RSI: ffffffff814e71b6 RDI: 0000000000000001
RBP: ffff888063aa9020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888063aa9020
R13: 0000000000000001 R14: 0000000000000102 R15: 000000000003dbcc
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c1eeff8 CR3: 0000000057de0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__refcount_sub_and_test include/linux/refcount.h:275 [inline]
__refcount_dec_and_test include/linux/refcount.h:307 [inline]
refcount_dec_and_test include/linux/refcount.h:325 [inline]
sctp_transport_put+0x12a/0x170 net/sctp/transport.c:483
call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1794
expire_timers kernel/time/timer.c:1845 [inline]
__run_timers+0x6e8/0x930 kernel/time/timer.c:2419
__run_timer_base kernel/time/timer.c:2430 [inline]
__run_timer_base kernel/time/timer.c:2423 [inline]
run_timer_base+0x111/0x190 kernel/time/timer.c:2439
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2449
handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0xa4/0xc0 arch/x86/kernel/smp.c:266
</IRQ>
<TASK>
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:sched_core_balance+0x9f/0xc40 kernel/sched/core.c:6339
Code: 40 83 1b 8e e8 32 48 0c 00 e8 dd 52 c3 09 5e 85 c0 0f 85 74 08 00 00 4c 89 e7 e8 6c 52 fe ff e8 67 be 36 00 fb 48 63 44 24 0c <48> c7 c3 80 ee 03 00 48 83 f8 07 48 89 44 24 10 0f 87 27 0b 00 00
RSP: 0000:ffffffff8de07b98 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff20bde99
RDX: 0000000000000000 RSI: ffffffff8b6cd040 RDI: ffffffff8bd1a0c0
RBP: ffffffff8de07e08 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff905f370f R11: 0000000000000000 R12: ffff8880b863ee80
R13: ffff8880b86288f0 R14: ffffffff815e6df0 R15: ffff8880b863ee80
do_balance_callbacks kernel/sched/core.c:4967 [inline]
__balance_callbacks kernel/sched/core.c:5021 [inline]
__schedule+0x3b2a/0x5750 kernel/sched/core.c:6678
schedule_idle+0x5c/0x90 kernel/sched/core.c:6793
do_idle+0x287/0x3f0 kernel/sched/idle.c:354
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:424
rest_init+0x16b/0x2b0 init/main.c:747
start_kernel+0x3e4/0x4d0 init/main.c:1105
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x148
</TASK>
----------------
Code disassembly (best guess):
0: 40 83 1b 8e rex sbbl $0xffffff8e,(%rbx)
4: e8 32 48 0c 00 call 0xc483b
9: e8 dd 52 c3 09 call 0x9c352eb
e: 5e pop %rsi
f: 85 c0 test %eax,%eax
11: 0f 85 74 08 00 00 jne 0x88b
17: 4c 89 e7 mov %r12,%rdi
1a: e8 6c 52 fe ff call 0xfffe528b
1f: e8 67 be 36 00 call 0x36be8b
24: fb sti
25: 48 63 44 24 0c movslq 0xc(%rsp),%rax
* 2a: 48 c7 c3 80 ee 03 00 mov $0x3ee80,%rbx <-- trapping instruction
31: 48 83 f8 07 cmp $0x7,%rax
35: 48 89 44 24 10 mov %rax,0x10(%rsp)
3a: 0f 87 27 0b 00 00 ja 0xb67