============================================
WARNING: possible recursive locking detected
6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0 Not tainted
--------------------------------------------
syz-executor.3/7286 is trying to acquire lock:
ffff888039923218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888039923218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3805 [inline]
ffff888039923218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_queue_xmit+0x2e8e/0x3d60 net/core/dev.c:4315
but task is already holding lock:
ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline]
ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:194 [inline]
ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:191 [inline]
ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3762 [inline]
ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_queue_xmit+0x1062/0x3d60 net/core/dev.c:4315
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
*** DEADLOCK ***
May be due to missing lock nesting notation
10 locks held by syz-executor.3/7286:
#0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2306 [inline]
#0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x410 kernel/trace/bpf_trace.c:2346
#1: ffffc90000007ce0 ((&in_dev->mr_ifc_timer)){+.-.}-{0:0}, at: call_timer_fn+0x118/0x590 kernel/time/timer.c:1697
#2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x36a/0x2550 net/ipv4/ip_output.c:228
#3: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#3: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:799 [inline]
#3: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3d60 net/core/dev.c:4274
#4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: br_dev_xmit+0x117/0x18a0 net/bridge/br_device.c:44
#5: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#5: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:799 [inline]
#5: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3d60 net/core/dev.c:4274
#6: ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#6: ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:194 [inline]
#6: ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:191 [inline]
#6: ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3762 [inline]
#6: ffff8880649b0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+.-.}-{2:2}, at: __dev_queue_xmit+0x1062/0x3d60 net/core/dev.c:4315
#7: ffff8880225168d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#7: ffff8880225168d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4403 [inline]
#7: ffff8880225168d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x333/0xc20 net/sched/sch_generic.c:340
#8: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#8: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#8: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x36a/0x2550 net/ipv4/ip_output.c:228
#9: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#9: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:799 [inline]
#9: ffffffff8cfa7d00 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x244/0x3d60 net/core/dev.c:4274
stack backtrace:
CPU: 0 PID: 7286 Comm: syz-executor.3 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
check_deadlock kernel/locking/lockdep.c:3062 [inline]
validate_chain kernel/locking/lockdep.c:3856 [inline]
__lock_acquire+0x20f8/0x3b20 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__dev_xmit_skb net/core/dev.c:3805 [inline]
__dev_queue_xmit+0x2e8e/0x3d60 net/core/dev.c:4315
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
neigh_hh_output include/net/neighbour.h:526 [inline]
neigh_output include/net/neighbour.h:540 [inline]
ip_finish_output2+0x16a4/0x2550 net/ipv4/ip_output.c:235
__ip_finish_output net/ipv4/ip_output.c:313 [inline]
__ip_finish_output+0x38b/0x650 net/ipv4/ip_output.c:295
ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
dst_output include/net/dst.h:451 [inline]
ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129
iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82
ip_tunnel_xmit+0x1dbc/0x33c0 net/ipv4/ip_tunnel.c:831
erspan_xmit+0x52b/0x1c00 net/ipv4/ip_gre.c:720
__netdev_start_xmit include/linux/netdevice.h:4940 [inline]
netdev_start_xmit include/linux/netdevice.h:4954 [inline]
xmit_one net/core/dev.c:3548 [inline]
dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564
sch_direct_xmit+0x1ac/0xc20 net/sched/sch_generic.c:342
__dev_xmit_skb net/core/dev.c:3775 [inline]
__dev_queue_xmit+0x1286/0x3d60 net/core/dev.c:4315
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
br_dev_queue_push_xmit+0x26e/0x7b0 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_forward_finish+0xf5/0x120 net/bridge/br_forward.c:66
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
__br_forward+0x1e5/0x5b0 net/bridge/br_forward.c:115
br_flood+0x35f/0x5c0 net/bridge/br_forward.c:247
br_dev_xmit+0xeca/0x18a0 net/bridge/br_device.c:100
__netdev_start_xmit include/linux/netdevice.h:4940 [inline]
netdev_start_xmit include/linux/netdevice.h:4954 [inline]
xmit_one net/core/dev.c:3548 [inline]
dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564
__dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4349
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
neigh_resolve_output net/core/neighbour.c:1563 [inline]
neigh_resolve_output+0x58c/0x900 net/core/neighbour.c:1543
neigh_output include/net/neighbour.h:542 [inline]
ip_finish_output2+0x833/0x2550 net/ipv4/ip_output.c:235
__ip_finish_output net/ipv4/ip_output.c:313 [inline]
__ip_finish_output+0x38b/0x650 net/ipv4/ip_output.c:295
ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
dst_output include/net/dst.h:451 [inline]
ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129
igmpv3_send_cr net/ipv4/igmp.c:723 [inline]
igmp_ifc_timer_expire+0x781/0x1050 net/ipv4/igmp.c:813
call_timer_fn+0x193/0x590 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x764/0xb20 kernel/time/timer.c:2022
run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
__do_softirq+0x21a/0x8de kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:207
Code: fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 48 8b 14 25 00 bd 03 00 <65> 8b 05 74 58 7d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74
RSP: 0018:ffffc90021517cb8 EFLAGS: 00000292
RAX: dffffc0000000000 RBX: ffffc90000c9e070 RCX: 1ffff920042a2fb0
RDX: ffff8880632d91c0 RSI: ffffffff8193fde0 RDI: ffffc90000c9e06a
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90021517d78
R13: ffffc90021517d50 R14: ffffc90021517d58 R15: 2020200025702020
___bpf_prog_run+0x2b/0xabc0 kernel/bpf/core.c:1698
__bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2201
bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline]
__bpf_prog_run include/linux/filter.h:651 [inline]
bpf_prog_run include/linux/filter.h:658 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2307 [inline]
bpf_trace_run2+0x14e/0x410 kernel/trace/bpf_trace.c:2346
__traceiter_sys_enter+0x2d/0x40 include/trace/events/syscalls.h:18
trace_sys_enter include/trace/events/syscalls.h:18 [inline]
syscall_trace_enter.constprop.0+0x1b7/0x1e0 kernel/entry/common.c:81
__syscall_enter_from_user_work kernel/entry/common.c:94 [inline]
syscall_enter_from_user_mode+0x107/0x120 kernel/entry/common.c:112
do_syscall_64+0x1c/0x110 arch/x86/entry/common.c:79
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fd2e8879717
Code: 89 7c 24 10 48 89 4c 24 18 e8 d5 a3 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 a4 02 00 8b 44
RSP: 002b:00007fff22893d50 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000002a60 RCX: 00007fd2e8879717
RDX: 0000000040000001 RSI: 00007fff22893ddc RDI: 00000000ffffffff
RBP: 00007fff22893ddc R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 00000000001561f9 R14: 00000000001561ef R15: 0000000000000005
net_ratelimit: 15 callbacks suppressed
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
----------------
Code disassembly (best guess):
0: fa cli
1: 48 8b be b0 01 00 00 mov 0x1b0(%rsi),%rdi
8: e8 b0 ff ff ff call 0xffffffbd
d: 31 c0 xor %eax,%eax
f: c3 ret
10: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
17: 00 00 00 00
1b: 66 90 xchg %ax,%ax
1d: f3 0f 1e fa endbr64
21: 65 48 8b 14 25 00 bd mov %gs:0x3bd00,%rdx
28: 03 00
* 2a: 65 8b 05 74 58 7d 7e mov %gs:0x7e7d5874(%rip),%eax # 0x7e7d58a5 <-- trapping instruction
31: a9 00 01 ff 00 test $0xff0100,%eax
36: 48 8b 34 24 mov (%rsp),%rsi
3a: 74 0f je 0x4b
3c: f6 c4 01 test $0x1,%ah
3f: 74 .byte 0x74