------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 2 PID: 2590 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28
Modules linked in:
CPU: 2 PID: 2590 Comm: syz-executor.0 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28
Code: e9 db fe ff ff 48 89 df e8 9c a5 e3 fd e9 8a fe ff ff e8 c2 e3 9c fd 48 c7 c7 80 d2 04 8a c6 05 67 e1 a1 09 01 e8 5e d9 25 05 <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
RSP: 0018:ffffc90000560d00 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888018f4ba00 RSI: ffffffff815f1d88 RDI: fffff520000ac192
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff815ebb2e R11: 0000000000000000 R12: ffff88801d587820
R13: 1ffff920000ac1a8 R14: ffffffff88624780 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5bfe000 CR3: 000000000b88e000 CR4: 0000000000152ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 sctp_transport_put+0x138/0x180 net/sctp/transport.c:486
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_release+0xc/0x720 kernel/locking/lockdep.c:5645
Code: e9 55 fe ff ff 48 c7 c7 88 60 91 8d e8 ed ad 61 00 e9 6d fd ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 41 55 41 54 49 89 fc 55 53 48 81 ec 90 00 00 00 48 8d 6c 24
RSP: 0018:ffffc9000698f738 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: ffffea0001a2d540 RCX: 0000000000000000
RDX: ffff888018f4ba00 RSI: ffffffff81aacd84 RDI: ffffffff8bb83b60
RBP: ffffea0001a2d540 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81aacd7c R11: 0000000000000000 R12: ffff88802cc34bc0
R13: ffff88802cc34be8 R14: dffffc0000000000 R15: 0000000000000003
 folio_mark_accessed mm/swap.c:442 [inline]
 folio_mark_accessed+0x510/0xd40 mm/swap.c:420
 zap_pte_range mm/memory.c:1354 [inline]
 zap_pmd_range mm/memory.c:1467 [inline]
 zap_pud_range mm/memory.c:1496 [inline]
 zap_p4d_range mm/memory.c:1517 [inline]
 unmap_page_range+0xd6d/0x29f0 mm/memory.c:1538
 unmap_single_vma+0x198/0x310 mm/memory.c:1583
 unmap_vmas+0x16b/0x2f0 mm/memory.c:1615
 exit_mmap+0x1d0/0x630 mm/mmap.c:3170
 __mmput+0x122/0x4b0 kernel/fork.c:1113
 mmput+0x56/0x60 kernel/fork.c:1134
 exit_mm kernel/exit.c:507 [inline]
 do_exit+0xb27/0x2b40 kernel/exit.c:819
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x47d/0x2220 kernel/signal.c:2852
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf6e66549
Code: Unable to access opcode bytes at RIP 0xf6e6651f.
RSP: 002b:00000000f5e605fc EFLAGS: 00000296 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffea RBX: 00000000ffffff9c RCX: 0000000020000100
RDX: 000000000000407a RSI: 0000000004000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	e9 55 fe ff ff       	jmpq   0xfffffe5a
   5:	48 c7 c7 88 60 91 8d 	mov    $0xffffffff8d916088,%rdi
   c:	e8 ed ad 61 00       	callq  0x61adfe
  11:	e9 6d fd ff ff       	jmpq   0xfffffd83
  16:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  1d:	00
  1e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  25:	fc ff df
  28:	41 57                	push   %r15
* 2a:	41 56                	push   %r14 <-- trapping instruction
  2c:	41 55                	push   %r13
  2e:	41 54                	push   %r12
  30:	49 89 fc             	mov    %rdi,%r12
  33:	55                   	push   %rbp
  34:	53                   	push   %rbx
  35:	48 81 ec 90 00 00 00 	sub    $0x90,%rsp
  3c:	48                   	rex.W
  3d:	8d                   	.byte 0x8d
  3e:	6c                   	insb   (%dx),%es:(%rdi)
  3f:	24                   	.byte 0x24