------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 22387 at lib/refcount.c:156 refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 22387 Comm: syz-executor.5 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 lib/dump_stack.c:113
 panic+0x223/0x4dc kernel/panic.c:219
 __warn.cold.10+0x1b/0x37 kernel/panic.c:576
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Code: 48 89 e5 e8 97 fe ff ff 84 c0 74 02 5d c3 80 3d 29 a1 f3 05 00 75 f5 48 c7 c7 20 a1 42 87 c6 05 19 a1 f3 05 01 e8 97 57 3a fe <0f> 0b 5d c3 90 55 48 89 e5 41 56 41 55 49 89 fd 48 c7 c7 80 a1 42
RSP: 0018:ffff8880904d7ca0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888091dd0e00 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff89da9080
RBP: ffff8880904d7ca0 R08: 0000000000000006 R09: fffffbfff1347739
R10: fffffbfff1347738 R11: ffffffff89a3b9c7 R12: ffff888092798200
R13: 0000000000000000 R14: 00000000ffffffed R15: ffff88809f459680
 kref_get include/linux/kref.h:45 [inline]
 j1939_netdev_start+0x49/0x510 net/can/j1939/main.c:247
 j1939_sk_bind+0x5b6/0x870 net/can/j1939/socket.c:438
 __sys_bind+0x1e1/0x230 net/socket.c:1647
 __do_sys_bind net/socket.c:1658 [inline]
 __se_sys_bind net/socket.c:1656 [inline]
 __x64_sys_bind+0x6e/0xb0 net/socket.c:1656
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f70e41acc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000000000018 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f70e41ad6d4
R13: 00000000004c057e R14: 00000000004d2c50 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..