=============================
WARNING: suspicious RCU usage
6.9.0-rc6-syzkaller-01478-gcdc74c9d06e7 #0 Not tainted
-----------------------------
net/bridge/br_private.h:1599 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by syz-executor.3/5694:
#0: ffff88805c95eaf8 (&dentry->d_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#0: ffff88805c95eaf8 (&dentry->d_lock){+.+.}-{2:2}, at: d_walk+0x3bb/0x710 fs/dcache.c:1289
#1: ffff88805e13ec70 (&dentry->d_lock/1){+.+.}-{2:2}, at: d_walk+0x1c3/0x710 fs/dcache.c:1253
#2: ffff88802fb08e18 (&lru->node[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff88802fb08e18 (&lru->node[i].lock){+.+.}-{2:2}, at: list_lru_del+0x69/0x310 mm/list_lru.c:126
#3: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#3: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#3: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: xa_load+0x153/0x480 lib/xarray.c:1459
#4: ffffc90000a08c00 ((&p->forward_delay_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1790
#5: ffff88805ccd4cb8 (&br->lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#5: ffff88805ccd4cb8 (&br->lock){+.-.}-{2:2}, at: br_forward_delay_timer_expired+0x50/0x440 net/bridge/br_stp_timer.c:86
stack backtrace:
CPU: 1 PID: 5694 Comm: syz-executor.3 Not tainted 6.9.0-rc6-syzkaller-01478-gcdc74c9d06e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712
nbp_vlan_group net/bridge/br_private.h:1599 [inline]
br_mst_set_state+0x1ea/0x650 net/bridge/br_mst.c:105
br_set_state+0x28a/0x7b0 net/bridge/br_stp.c:47
br_forward_delay_timer_expired+0x176/0x440 net/bridge/br_stp_timer.c:88
call_timer_fn+0x18e/0x650 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1844 [inline]
__run_timers kernel/time/timer.c:2418 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2429
run_timer_base kernel/time/timer.c:2438 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2448
__do_softirq+0x2c6/0x980 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 aa 7b 88 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000a4cf1a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92001499e40 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcaca80 RDI: ffffffff8c1f8600
RBP: ffffc9000a4cf2e8 R08: ffffffff92f40507 R09: 1ffffffff25e80a0
R10: dffffc0000000000 R11: fffffbfff25e80a1 R12: 1ffff92001499e3c
R13: dffffc0000000000 R14: ffffc9000a4cf200 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
xa_load+0x174/0x480 lib/xarray.c:1459
list_lru_from_memcg_idx mm/list_lru.c:56 [inline]
list_lru_del+0x121/0x310 mm/list_lru.c:128
d_lru_del fs/dcache.c:441 [inline]
to_shrink_list+0x136/0x340 fs/dcache.c:864
select_collect+0xce/0x1b0 fs/dcache.c:1432
d_walk+0x1d1/0x710 fs/dcache.c:1255
shrink_dcache_parent+0x144/0x3b0 fs/dcache.c:1487
d_invalidate+0x11c/0x2d0 fs/dcache.c:1592
proc_invalidate_siblings_dcache+0x3fb/0x6e0 fs/proc/inode.c:142
release_task+0x1674/0x1810 kernel/exit.c:282
wait_task_zombie kernel/exit.c:1189 [inline]
wait_consider_task+0x1a14/0x2e50 kernel/exit.c:1416
do_wait_thread kernel/exit.c:1479 [inline]
__do_wait+0x1b0/0x850 kernel/exit.c:1597
do_wait+0x1e9/0x560 kernel/exit.c:1631
kernel_wait4+0x2a7/0x3e0 kernel/exit.c:1790
__do_sys_wait4 kernel/exit.c:1818 [inline]
__se_sys_wait4 kernel/exit.c:1814 [inline]
__x64_sys_wait4+0x134/0x1e0 kernel/exit.c:1814
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea5aa7a6d7
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:00007ffc137a5dc0 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000000170 RCX: 00007fea5aa7a6d7
RDX: 0000000040000001 RSI: 00007ffc137a5e4c RDI: 00000000ffffffff
RBP: 00007ffc137a5e4c R08: 0000000000000000 R09: 00007fea5b7d50b0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 0000000000022fb5 R14: 0000000000022c66 R15: 0000000000000017
bridge0: port 1(netdevsim0) entered learning state
bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: topology change detected, propagating
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: topology change detected, propagating
----------------
Code disassembly (best guess):
0: 2b 00 sub (%rax),%eax
2: 74 08 je 0xc
4: 4c 89 f7 mov %r14,%rdi
7: e8 aa 7b 88 00 call 0x887bb6
c: f6 44 24 61 02 testb $0x2,0x61(%rsp)
11: 0f 85 85 01 00 00 jne 0x19c
17: 41 f7 c7 00 02 00 00 test $0x200,%r15d
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp)
28: e0 45
* 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction
31: 00 00
33: 43 c7 44 25 09 00 00 movl $0x0,0x9(%r13,%r12,1)
3a: 00 00
3c: 43 rex.XB
3d: c7 .byte 0xc7
3e: 44 rex.R
3f: 25 .byte 0x25