=============================
WARNING: suspicious RCU usage
6.9.0-rc7-syzkaller-00116-g4c639b6a7b9d #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
5 locks held by syz-executor.2/9566:
#0: ffffffff8e3df4f0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:637 [inline]
#0: ffffffff8e3df4f0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1688 [inline]
#0: ffffffff8e3df4f0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x275/0x2180 kernel/fork.c:1737
#1: ffff88805f3c9e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline]
#1: ffff88805f3c9e20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:638 [inline]
#1: ffff88805f3c9e20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1688 [inline]
#1: ffff88805f3c9e20 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm+0x295/0x2180 kernel/fork.c:1737
#2: ffff88807a56c420 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline]
#2: ffff88807a56c420 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:647 [inline]
#2: ffff88807a56c420 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1688 [inline]
#2: ffff88807a56c420 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm+0x3d1/0x2180 kernel/fork.c:1737
#3: ffffc90000a08be0 ((&p->forward_delay_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1790
#4: ffff888029534cb8 (&br->lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#4: ffff888029534cb8 (&br->lock){+.-.}-{2:2}, at: br_forward_delay_timer_expired+0x50/0x440 net/bridge/br_stp_timer.c:86
stack backtrace:
CPU: 1 PID: 9566 Comm: syz-executor.2 Not tainted 6.9.0-rc7-syzkaller-00116-g4c639b6a7b9d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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
handle_softirqs+0x2d6/0x990 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:get_page_from_freelist+0x2ea4/0x35b0 mm/page_alloc.c:3192
Code: 24 18 48 85 db 0f 85 64 05 00 00 48 8b 9c 24 90 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 75 02 00 00 44 8b 33 <48> 8b 9c 24 d0 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 0d
RSP: 0018:ffffc90004c27380 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004c2767c RCX: 0000000000000000
RDX: ffff88813fffc440 RSI: 0000000000000008 RDI: ffff88813fffb550
RBP: ffffc90004c275f0 R08: ffff88813fffb557 R09: 1ffff11027fff6aa
R10: dffffc0000000000 R11: ffffed1027fff6ab R12: 1ffff92000984ecf
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000001
__alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2180
allocate_slab mm/slub.c:2343 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2396
___slab_alloc+0xc73/0x1260 mm/slub.c:3530
__slab_alloc mm/slub.c:3615 [inline]
__slab_alloc_node mm/slub.c:3668 [inline]
slab_alloc_node mm/slub.c:3841 [inline]
kmem_cache_alloc+0x252/0x350 mm/slub.c:3858
vma_lock_alloc kernel/fork.c:441 [inline]
vm_area_dup+0x61/0x290 kernel/fork.c:494
dup_mmap kernel/fork.c:697 [inline]
dup_mm kernel/fork.c:1688 [inline]
copy_mm+0xd7f/0x2180 kernel/fork.c:1737
copy_process+0x187a/0x3df0 kernel/fork.c:2390
kernel_clone+0x226/0x8f0 kernel/fork.c:2797
__do_sys_clone kernel/fork.c:2940 [inline]
__se_sys_clone kernel/fork.c:2924 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2924
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: 0033:0x7f5da027ad93
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffee86bde28 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5da027ad93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555ea76750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
bridge0: port 1(bridge_slave_0) entered learning state
bridge0: port 2(bridge_slave_1) entered learning state
----------------
Code disassembly (best guess):
0: 24 18 and $0x18,%al
2: 48 85 db test %rbx,%rbx
5: 0f 85 64 05 00 00 jne 0x56f
b: 48 8b 9c 24 90 00 00 mov 0x90(%rsp),%rbx
12: 00
13: 48 89 d8 mov %rbx,%rax
16: 48 c1 e8 03 shr $0x3,%rax
1a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
1f: 84 c0 test %al,%al
21: 0f 85 75 02 00 00 jne 0x29c
27: 44 8b 33 mov (%rbx),%r14d
* 2a: 48 8b 9c 24 d0 01 00 mov 0x1d0(%rsp),%rbx <-- trapping instruction
31: 00
32: 48 89 d8 mov %rbx,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
3e: 74 0d je 0x4d