=============================
WARNING: suspicious RCU usage
6.10.0-rc2-syzkaller-00761-g3ec8d7572a69 #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
4 locks held by syz-executor.2/15860:
#0: ffff88802411ba98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:106 [inline]
#0: ffff88802411ba98 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x2a9/0xc80 mm/mmap.c:3349
#1: ffffc90000007c00 ((&p->forward_delay_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1789
#2: ffff88806c670cb8 (&br->lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff88806c670cb8 (&br->lock){+.-.}-{2:2}, at: br_forward_delay_timer_expired+0x50/0x440 net/bridge/br_stp_timer.c:86
#3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: br_mst_set_state+0x171/0x7a0 net/bridge/br_mst.c:105
stack backtrace:
CPU: 0 PID: 15860 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00761-g3ec8d7572a69 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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+0x29e/0x7a0 net/bridge/br_mst.c:106
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:1792
expire_timers kernel/time/timer.c:1843 [inline]
__run_timers kernel/time/timer.c:2417 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
run_timer_base kernel/time/timer.c:2437 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
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:unwind_next_frame+0x4c1/0x2a00 arch/x86/kernel/unwind_orc.c:494
Code: c1 0f 83 e9 00 00 00 e8 8d 32 55 00 48 c7 c3 b8 83 ba 8f 49 bd 00 00 00 00 00 fc ff df e9 96 01 00 00 49 89 df 48 89 5c 24 28 <49> 89 dd 4c 8b 74 24 38 4c 89 e0 4c 29 e8 48 89 c1 48 c1 f9 02 48
RSP: 0018:ffffc9000aa97528 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8fbe4d80 RCX: ffffffff90311e2e
RDX: ffff88801a3c3c00 RSI: 000000000000f272 RDI: 000000000000f273
RBP: 0000000000005967 R08: ffffffff8140f23e R09: ffffc9000aa976f0
R10: 0000000000000003 R11: ffffffff8181dfd0 R12: ffffffff8fbe4d80
R13: 00000000000ac001 R14: dffffc0000000000 R15: ffffffff8fbe4d80
arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2195 [inline]
slab_free mm/slub.c:4436 [inline]
kmem_cache_free+0x145/0x350 mm/slub.c:4511
vma_lock_free kernel/fork.c:453 [inline]
__vm_area_free+0xe0/0x110 kernel/fork.c:509
remove_vma mm/mmap.c:146 [inline]
exit_mmap+0x645/0xc80 mm/mmap.c:3365
__mmput+0x115/0x3c0 kernel/fork.c:1346
exit_mm+0x220/0x310 kernel/exit.c:565
do_exit+0x9aa/0x27e0 kernel/exit.c:861
do_group_exit+0x207/0x2c0 kernel/exit.c:1023
__do_sys_exit_group kernel/exit.c:1034 [inline]
__se_sys_exit_group kernel/exit.c:1032 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1032
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7dba27cf29
Code: Unable to access opcode bytes at 0x7f7dba27ceff.
RSP: 002b:00007fff8ec3c4a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7dba27cf29
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000400000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fff8ec3c580 R15: 0000000000000001
bridge0: port 1(bridge_slave_0) entered learning state
bridge0: port 2(bridge_slave_1) entered learning state
bridge0: port 3(macsec0) entered learning state
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 0f 83 e9 00 00 00 jae 0xef
6: e8 8d 32 55 00 call 0x553298
b: 48 c7 c3 b8 83 ba 8f mov $0xffffffff8fba83b8,%rbx
12: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
19: fc ff df
1c: e9 96 01 00 00 jmp 0x1b7
21: 49 89 df mov %rbx,%r15
24: 48 89 5c 24 28 mov %rbx,0x28(%rsp)
* 29: 49 89 dd mov %rbx,%r13 <-- trapping instruction
2c: 4c 8b 74 24 38 mov 0x38(%rsp),%r14
31: 4c 89 e0 mov %r12,%rax
34: 4c 29 e8 sub %r13,%rax
37: 48 89 c1 mov %rax,%rcx
3a: 48 c1 f9 02 sar $0x2,%rcx
3e: 48 rex.W