vcan0: j1939_tp_rxtimer: 0xffff888061d81800: rx timeout, send abort
vcan0: j1939_tp_rxtimer: 0xffff888061d83400: rx timeout, send abort
vcan0: j1939_tp_rxtimer: 0xffff888061d81800: abort rx timeout. Force session deactivation
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 5439 at lib/refcount.c:25 refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 5439 Comm: syz.3.428 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:refcount_warn_saturate+0xff/0x1a0 lib/refcount.c:25
Code: 09 01 48 c7 c7 40 6b 59 8a e8 dd 27 bb 05 0f 0b eb e0 e8 04 42 9c fd c6 05 ae 8f 79 09 01 48 c7 c7 80 6a 59 8a e8 c1 27 bb 05 <0f> 0b eb c4 e8 e8 41 9c fd c6 05 93 8f 79 09 01 48 c7 c7 e0 6a 59
RSP: 0018:ffffc90000dd0848 EFLAGS: 00010246
RAX: 856de52c1df66800 RBX: 0000000000000002 RCX: ffff888023440000
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc90000dd09b0 R08: dffffc0000000000 R09: fffff520001ba06d
R10: fffff520001ba06d R11: 1ffff920001ba06c R12: ffff8880799f3500
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  0000555563885500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555563898588 CR3: 000000006195b000 CR4: 00000000003506e0
DR0: 00000000000000f8 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 get_net include/net/net_namespace.h:252 [inline]
 tipc_aead_encrypt net/tipc/crypto.c:832 [inline]
 tipc_crypto_xmit+0x1949/0x2560 net/tipc/crypto.c:1772
 tipc_bearer_xmit_skb+0x228/0x3c0 net/tipc/bearer.c:574
 tipc_disc_timeout+0x568/0x6b0 net/tipc/discover.c:338
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x60 kernel/kcov.c:206
Code: 89 fb e8 17 00 00 00 48 8b 3d 00 ec f0 0b 48 89 de 5b e9 47 ae 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 94 ad 8a 7e <65> 8b 15 95 ad 8a 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90002e9f970 EFLAGS: 00000202
RAX: ffffffff812ba575 RBX: ffff888054961940 RCX: ffff888023440000
RDX: 0000000000000340 RSI: 0000000000000000 RDI: ffff888054961cc0
RBP: ffff888054960000 R08: dffffc0000000000 R09: ffff888054961980
R10: 0000000000000000 R11: 0000000000000068 R12: ffff888054961980
R13: dffffc0000000000 R14: ffff888023440000 R15: ffff888054960000
 local_bh_disable+0x5/0x20 include/linux/bottom_half.h:18
 fpregs_lock arch/x86/include/asm/fpu/api.h:70 [inline]
 fpu_clone+0x83/0x630 arch/x86/kernel/fpu/core.c:258
 dup_task_struct+0x289/0xb30 kernel/fork.c:908
 copy_process+0x5b3/0x3e00 kernel/fork.c:2121
 kernel_clone+0x219/0x930 kernel/fork.c:2679
 __do_sys_clone3 kernel/fork.c:2954 [inline]
 __se_sys_clone3+0x2d5/0x360 kernel/fork.c:2938
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb5ed6c8189
Code: c0 08 00 48 8d 3d 1c c0 08 00 e8 02 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007ffd863a4f28 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007fb5ed64a590 RCX: 00007fb5ed6c8189
RDX: 00007fb5ed64a590 RSI: 0000000000000058 RDI: 00007ffd863a4f70
RBP: 00007fb5eb4fb6c0 R08: 00007fb5eb4fb6c0 R09: 00007ffd863a5057
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8
R13: 000000000000000b R14: 00007ffd863a4f70 R15: 00007ffd863a5058
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 fb                	mov    %edi,%ebx
   2:	e8 17 00 00 00       	call   0x1e
   7:	48 8b 3d 00 ec f0 0b 	mov    0xbf0ec00(%rip),%rdi        # 0xbf0ec0e
   e:	48 89 de             	mov    %rbx,%rsi
  11:	5b                   	pop    %rbx
  12:	e9 47 ae 44 00       	jmp    0x44ae5e
  17:	00 00                	add    %al,(%rax)
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	00 00                	add    %al,(%rax)
  1d:	cc                   	int3
  1e:	48 8b 04 24          	mov    (%rsp),%rax
  22:	65 48 8b 0d 94 ad 8a 	mov    %gs:0x7e8aad94(%rip),%rcx        # 0x7e8aadbe
  29:	7e
* 2a:	65 8b 15 95 ad 8a 7e 	mov    %gs:0x7e8aad95(%rip),%edx        # 0x7e8aadc6 <-- 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