program: r0 = socket$can_j1939(0x1d, 0x2, 0x7) ioctl$ifreq_SIOCGIFINDEX_vcan(r0, 0x8933, &(0x7f0000000040)={'vxcan0\x00', 0x0}) bind$can_j1939(r0, &(0x7f0000000080)={0x1d, r1}, 0x18) r2 = socket$can_j1939(0x1d, 0x2, 0x7) ioctl$ifreq_SIOCGIFINDEX_vcan(r2, 0x8933, &(0x7f00000000c0)={'vxcan1\x00', 0x0}) bind$can_j1939(r2, &(0x7f0000000100)={0x1d, r3}, 0x18) connect$can_j1939(r2, &(0x7f0000000140)={0x1d, r3}, 0x18) sendmsg$can_j1939(r2, &(0x7f0000000180)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000200)='data', 0x4}}, 0x0) recvmsg$can_j1939(r0, &(0x7f0000000240)={0x0, 0x0, &(0x7f0000000280)=[{&(0x7f00000002c0)=""/4, 0x4}], 0x1}, 0x0) [ 70.970533][ T5305] Bluetooth: hci0: command tx timeout [ 71.066156][ T5319] ------------[ cut here ]------------ [ 71.068525][ T5319] refcount_t: underflow; use-after-free. [ 71.071452][ T5319] WARNING: CPU: 0 PID: 5319 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 [ 71.075215][ T5319] Modules linked in: [ 71.076706][ T5319] CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 71.081600][ T5319] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 71.085737][ T5319] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 71.088349][ T5319] Code: e0 1e 5f 8c e8 07 c1 95 fc 90 0f 0b 90 90 eb 99 e8 ab 19 d5 fc c6 05 ed 27 39 0b 01 90 48 c7 c7 40 1f 5f 8c e8 e7 c0 95 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 88 19 d5 fc c6 05 c7 27 39 0b 01 90 [ 71.096005][ T5319] RSP: 0018:ffffc9000d3af8e8 EFLAGS: 00010246 [ 71.098395][ T5319] RAX: a754ef3b3dfdf400 RBX: ffff888043b019a4 RCX: 0000000000100000 [ 71.101385][ T5319] RDX: ffffc9000ec3a000 RSI: 00000000000009ac RDI: 00000000000009ad [ 71.104051][ T5319] RBP: 0000000000000003 R08: ffffffff81601c02 R09: 1ffff11003f8519a [ 71.106803][ T5319] R10: dffffc0000000000 R11: ffffed1003f8519b R12: ffff888042149468 [ 71.109505][ T5319] R13: ffff888043b019a4 R14: 1ffff11008429298 R15: ffff888042149400 [ 71.112506][ T5319] FS: 00007f2971b9c6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 [ 71.115890][ T5319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.118395][ T5319] CR2: 0000000020000040 CR3: 0000000043078000 CR4: 0000000000352ef0 [ 71.121673][ T5319] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.124820][ T5319] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.128021][ T5319] Call Trace: [ 71.129464][ T5319] [ 71.130619][ T5319] ? __warn+0x165/0x4d0 [ 71.132411][ T5319] ? refcount_warn_saturate+0x15a/0x1d0 [ 71.134627][ T5319] ? report_bug+0x2b3/0x500 [ 71.136499][ T5319] ? refcount_warn_saturate+0x15a/0x1d0 [ 71.138714][ T5319] ? handle_bug+0x60/0x90 [ 71.140447][ T5319] ? exc_invalid_op+0x1a/0x50 [ 71.142390][ T5319] ? asm_exc_invalid_op+0x1a/0x20 [ 71.144425][ T5319] ? __warn_printk+0x292/0x360 [ 71.146385][ T5319] ? refcount_warn_saturate+0x15a/0x1d0 [ 71.148928][ T5319] ? refcount_warn_saturate+0x159/0x1d0 [ 71.151667][ T5319] j1939_session_put+0x1ed/0x440 [ 71.154157][ T5319] j1939_sk_sendmsg+0x121b/0x14c0 [ 71.156122][ T5319] ? __pfx_j1939_sk_sendmsg+0x10/0x10 [ 71.158258][ T5319] ? __import_iovec+0x590/0x870 [ 71.159981][ T5319] ? aa_sock_msg_perm+0x91/0x160 [ 71.161778][ T5319] ? __pfx_j1939_sk_sendmsg+0x10/0x10 [ 71.163820][ T5319] __sock_sendmsg+0x221/0x270 [ 71.165469][ T5319] ____sys_sendmsg+0x52a/0x7e0 [ 71.167181][ T5319] ? __pfx_____sys_sendmsg+0x10/0x10 [ 71.169081][ T5319] ? __fget_files+0x2a/0x410 [ 71.170664][ T5319] ? __fget_files+0x2a/0x410 [ 71.172418][ T5319] __sys_sendmsg+0x269/0x350 [ 71.174011][ T5319] ? __pfx___sys_sendmsg+0x10/0x10 [ 71.176001][ T5319] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 71.178377][ T5319] ? do_syscall_64+0x100/0x230 [ 71.180258][ T5319] ? do_syscall_64+0xb6/0x230 [ 71.182124][ T5319] do_syscall_64+0xf3/0x230 [ 71.183835][ T5319] ? clear_bhb_loop+0x35/0x90 [ 71.185710][ T5319] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.188293][ T5319] RIP: 0033:0x7f2970d7ff19 [ 71.189951][ T5319] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 71.197786][ T5319] RSP: 002b:00007f2971b9c058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 71.200804][ T5319] RAX: ffffffffffffffda RBX: 00007f2970f45fa0 RCX: 00007f2970d7ff19 [ 71.203776][ T5319] RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 [ 71.206916][ T5319] RBP: 00007f2970df3986 R08: 0000000000000000 R09: 0000000000000000 [ 71.209875][ T5319] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 71.212892][ T5319] R13: 0000000000000000 R14: 00007f2970f45fa0 R15: 00007fffa0b16f68 [ 71.215981][ T5319] [ 71.217192][ T5319] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 71.219866][ T5319] CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 71.223496][ T5319] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 71.227554][ T5319] Call Trace: [ 71.228887][ T5319] [ 71.230067][ T5319] dump_stack_lvl+0x241/0x360 [ 71.231929][ T5319] ? __pfx_dump_stack_lvl+0x10/0x10 [ 71.233960][ T5319] ? __pfx__printk+0x10/0x10 [ 71.235827][ T5319] ? _printk+0xd5/0x120 [ 71.237507][ T5319] ? __init_begin+0x41000/0x41000 [ 71.239389][ T5319] ? vscnprintf+0x5d/0x90 [ 71.241051][ T5319] panic+0x349/0x880 [ 71.242548][ T5319] ? __warn+0x174/0x4d0 [ 71.244133][ T5319] ? __pfx_panic+0x10/0x10 [ 71.245907][ T5319] __warn+0x344/0x4d0 [ 71.247230][ T5319] ? refcount_warn_saturate+0x15a/0x1d0 [ 71.249439][ T5319] report_bug+0x2b3/0x500 [ 71.251106][ T5319] ? refcount_warn_saturate+0x15a/0x1d0 [ 71.253207][ T5319] handle_bug+0x60/0x90 [ 71.254799][ T5319] exc_invalid_op+0x1a/0x50 [ 71.256605][ T5319] asm_exc_invalid_op+0x1a/0x20 [ 71.258532][ T5319] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 71.260938][ T5319] Code: e0 1e 5f 8c e8 07 c1 95 fc 90 0f 0b 90 90 eb 99 e8 ab 19 d5 fc c6 05 ed 27 39 0b 01 90 48 c7 c7 40 1f 5f 8c e8 e7 c0 95 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 88 19 d5 fc c6 05 c7 27 39 0b 01 90 [ 71.267815][ T5319] RSP: 0018:ffffc9000d3af8e8 EFLAGS: 00010246 [ 71.269822][ T5319] RAX: a754ef3b3dfdf400 RBX: ffff888043b019a4 RCX: 0000000000100000 [ 71.272563][ T5319] RDX: ffffc9000ec3a000 RSI: 00000000000009ac RDI: 00000000000009ad [ 71.275540][ T5319] RBP: 0000000000000003 R08: ffffffff81601c02 R09: 1ffff11003f8519a [ 71.278616][ T5319] R10: dffffc0000000000 R11: ffffed1003f8519b R12: ffff888042149468 [ 71.281461][ T5319] R13: ffff888043b019a4 R14: 1ffff11008429298 R15: ffff888042149400 [ 71.284411][ T5319] ? __warn_printk+0x292/0x360 [ 71.286338][ T5319] ? refcount_warn_saturate+0x159/0x1d0 [ 71.288525][ T5319] j1939_session_put+0x1ed/0x440 [ 71.290551][ T5319] j1939_sk_sendmsg+0x121b/0x14c0 [ 71.292483][ T5319] ? __pfx_j1939_sk_sendmsg+0x10/0x10 [ 71.294670][ T5319] ? __import_iovec+0x590/0x870 [ 71.296607][ T5319] ? aa_sock_msg_perm+0x91/0x160 [ 71.298573][ T5319] ? __pfx_j1939_sk_sendmsg+0x10/0x10 [ 71.300669][ T5319] __sock_sendmsg+0x221/0x270 [ 71.302413][ T5319] ____sys_sendmsg+0x52a/0x7e0 [ 71.304137][ T5319] ? __pfx_____sys_sendmsg+0x10/0x10 [ 71.306051][ T5319] ? __fget_files+0x2a/0x410 [ 71.307792][ T5319] ? __fget_files+0x2a/0x410 [ 71.309567][ T5319] __sys_sendmsg+0x269/0x350 [ 71.311382][ T5319] ? __pfx___sys_sendmsg+0x10/0x10 [ 71.313396][ T5319] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 71.315870][ T5319] ? do_syscall_64+0x100/0x230 [ 71.317779][ T5319] ? do_syscall_64+0xb6/0x230 [ 71.319620][ T5319] do_syscall_64+0xf3/0x230 [ 71.321404][ T5319] ? clear_bhb_loop+0x35/0x90 [ 71.323243][ T5319] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.325363][ T5319] RIP: 0033:0x7f2970d7ff19 [ 71.327013][ T5319] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 71.334096][ T5319] RSP: 002b:00007f2971b9c058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 71.337292][ T5319] RAX: ffffffffffffffda RBX: 00007f2970f45fa0 RCX: 00007f2970d7ff19 [ 71.340219][ T5319] RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 [ 71.343154][ T5319] RBP: 00007f2970df3986 R08: 0000000000000000 R09: 0000000000000000 [ 71.346196][ T5319] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 71.349175][ T5319] R13: 0000000000000000 R14: 00007f2970f45fa0 R15: 00007fffa0b16f68 [ 71.352309][ T5319] [ 71.353778][ T5319] Kernel Offset: disabled [ 71.355551][ T5319] Rebooting in 86400 seconds..