lec:lec_tx_timeout: lec0
lec:lec_start_xmit: lec0:No lecd attached
ip6_tunnel: ip6gretap0 xmit: Local address not yet configured!
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x9f/0x110 lib/refcount.c:25, CPU#0: syz.0.4341/23219
Modules linked in:
CPU: 0 UID: 0 PID: 23219 Comm: syz.0.4341 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:refcount_warn_saturate+0x9f/0x110 lib/refcount.c:25
Code: eb 66 85 db 74 3e 83 fb 01 75 4c e8 db 22 14 fd 48 8d 3d 74 b5 8c 0b 67 48 0f b9 3a eb 4a e8 c8 22 14 fd 48 8d 3d 71 b5 8c 0b <67> 48 0f b9 3a eb 37 e8 b5 22 14 fd 48 8d 3d 6e b5 8c 0b 67 48 0f
RSP: 0018:ffffc90000007c28 EFLAGS: 00010246
RAX: ffffffff84b1ae28 RBX: 0000000000000002 RCX: ffff888026db3d80
RDX: 0000000000000100 RSI: ffffffff8f10e400 RDI: ffffffff903e63a0
RBP: 0000000000000000 R08: ffff888026db3d80 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000100 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880637be004 R15: ffff8880637be3c0
FS:  0000000000000000(0000) GS:ffff888125213000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f498264168 CR3: 000000000e74a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sctp_generate_timeout_event+0x1c8/0x390 net/sctp/sm_sideeffect.c:284
 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x70 kernel/kcov.c:217
Code: 08 ff 7a 11 65 8b 15 29 ff 7a 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 cc 16 00 00 00 74 2c 8b 91 a8 16 00 00 <83> fa 02 75 21 48 8b 91 b0 16 00 00 48 8b 32 48 8d 7e 01 8b 89 ac
RSP: 0018:ffffc90006817398 EFLAGS: 00000246
RAX: ffffffff82167f8b RBX: 00007f7c8ae11000 RCX: ffff888026db3d80
RDX: 0000000000000000 RSI: 00000000000001fd RDI: 000000000000001c
RBP: ffffc90006817690 R08: ffffea0001298633 R09: 1ffffd40002530c6
R10: dffffc0000000000 R11: fffff940002530c7 R12: dffffc0000000000
R13: ffff8880896e1088 R14: 1ffff110112dc200 R15: 800000004a618007
 zap_present_folio_ptes mm/memory.c:1661 [inline]
 zap_present_ptes mm/memory.c:1714 [inline]
 do_zap_pte_range mm/memory.c:1816 [inline]
 zap_pte_range mm/memory.c:1918 [inline]
 zap_pmd_range mm/memory.c:2004 [inline]
 zap_pud_range mm/memory.c:2032 [inline]
 zap_p4d_range mm/memory.c:2053 [inline]
 __zap_vma_range+0x21db/0x4b40 mm/memory.c:2093
 unmap_vmas+0x379/0x530 mm/memory.c:2162
 exit_mmap+0x280/0x9e0 mm/mmap.c:1300
 __mmput+0x118/0x430 kernel/fork.c:1178
 exit_mm+0x18e/0x250 kernel/exit.c:581
 do_exit+0x6a2/0x22c0 kernel/exit.c:963
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c8c19cdd9
Code: Unable to access opcode bytes at 0x7f7c8c19cdaf.
RSP: 002b:00007f7c8d0f7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffb3 RBX: 00007f7c8c415fa0 RCX: 00007f7c8c19cdd9
RDX: 0000200000000180 RSI: 00000000400454dc RDI: 0000000000000005
RBP: 00007f7c8c232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c8c416038 R14: 00007f7c8c415fa0 R15: 00007ffcea206638
 </TASK>
----------------
Code disassembly (best guess):
   0:	eb 66                	jmp    0x68
   2:	85 db                	test   %ebx,%ebx
   4:	74 3e                	je     0x44
   6:	83 fb 01             	cmp    $0x1,%ebx
   9:	75 4c                	jne    0x57
   b:	e8 db 22 14 fd       	call   0xfd1422eb
  10:	48 8d 3d 74 b5 8c 0b 	lea    0xb8cb574(%rip),%rdi        # 0xb8cb58b
  17:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  1c:	eb 4a                	jmp    0x68
  1e:	e8 c8 22 14 fd       	call   0xfd1422eb
  23:	48 8d 3d 71 b5 8c 0b 	lea    0xb8cb571(%rip),%rdi        # 0xb8cb59b
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb 37                	jmp    0x68
  31:	e8 b5 22 14 fd       	call   0xfd1422eb
  36:	48 8d 3d 6e b5 8c 0b 	lea    0xb8cb56e(%rip),%rdi        # 0xb8cb5ab
  3d:	67                   	addr32
  3e:	48                   	rex.W
  3f:	0f                   	.byte 0xf