------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 17741 at lib/refcount.c:25 refcount_warn_saturate+0x108/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 17741 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller-09416-g49624efa65ac #0
Hardware name: linux,dummy-virt (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x108/0x1a0 lib/refcount.c:25
lr : refcount_warn_saturate+0x108/0x1a0 lib/refcount.c:25
sp : ffff800019e57b30
x29: ffff800019e57b30 x28: ffff800019e57ce4 x27: ffff000038cf0000
x26: 0000000000000004 x25: ffff000014924c80 x24: 1fffe00002bd96c3
x23: ffff800016e430e0 x22: 1ffff000033caf9e x21: ffff000038cf0000
x20: ffff00001cac9108 x19: 0000000000000002 x18: fffffbffeff98e88
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 1ffff000033caea4 x13: 0000000000000001 x12: ffff60000d54bb9c
x11: 1fffe0000d54bb9b x10: ffff60000d54bb9b x9 : dfff800000000000
x8 : ffff00006aa5dcdb x7 : 0000000000000001 x6 : 00009ffff2ab4465
x5 : ffff00006aa5dcd8 x4 : 1fffe000012af691 x3 : dfff800000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00000957b480
Call trace:
 refcount_warn_saturate+0x108/0x1a0 lib/refcount.c:25
 __refcount_add include/linux/refcount.h:199 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 j1939_netdev_start+0x4d4/0x720 net/can/j1939/main.c:254
 j1939_sk_bind+0x2dc/0xb40 net/can/j1939/socket.c:482
 __sys_bind+0x16c/0x1d0 net/socket.c:1693
 __do_sys_bind net/socket.c:1704 [inline]
 __se_sys_bind net/socket.c:1702 [inline]
 __arm64_sys_bind+0x6c/0xa0 net/socket.c:1702
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52
 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142
 do_el0_svc_compat+0x40/0x80 arch/arm64/kernel/syscall.c:187
 el0_svc_compat+0x64/0x290 arch/arm64/kernel/entry-common.c:726
 el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:736
 el0t_32_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:577
irq event stamp: 438
hardirqs last  enabled at (437): [<ffff8000102af96c>] __up_console_sem+0x78/0x8c kernel/printk/printk.c:255
hardirqs last disabled at (438): [<ffff8000145f03e4>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:386
softirqs last  enabled at (416): [<ffff8000137ca710>] lock_sock_nested+0xf0/0x1d0 net/core/sock.c:3191
softirqs last disabled at (414): [<ffff8000137ca670>] spin_lock_bh include/linux/spinlock.h:368 [inline]
softirqs last disabled at (414): [<ffff8000137ca670>] lock_sock_nested+0x50/0x1d0 net/core/sock.c:3183
---[ end trace afac41fa06197e0c ]---