======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.4015/19078 is trying to acquire lock:
ffff8880486ed238 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0x94/0x630 kernel/bpf/lpm_trie.c:466
but task is already holding lock:
ffff8880b8f37de8 (stock_lock){-.-.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b8f37de8 (stock_lock){-.-.}-{2:2}, at: refill_obj_stock+0xef/0x6a0 mm/memcontrol.c:3366
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (stock_lock){-.-.}-{2:2}:
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
consume_obj_stock mm/memcontrol.c:3267 [inline]
obj_cgroup_charge+0x10a/0x630 mm/memcontrol.c:3397
memcg_slab_pre_alloc_hook mm/slab.h:508 [inline]
slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:719
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0xa6/0x240 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
bpf_map_kmalloc_node+0xbc/0x1b0 kernel/bpf/syscall.c:424
lpm_trie_node_alloc kernel/bpf/lpm_trie.c:291 [inline]
trie_update_elem+0x172/0xd60 kernel/bpf/lpm_trie.c:338
bpf_map_update_value+0x64b/0x710 kernel/bpf/syscall.c:203
generic_map_update_batch+0x5de/0x800 kernel/bpf/syscall.c:1800
bpf_map_do_batch+0x3f2/0x600 kernel/bpf/syscall.c:5011
__sys_bpf+0x381/0x890 kernel/bpf/syscall.c:-1
__do_sys_bpf kernel/bpf/syscall.c:5582 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5580 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5580
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (&trie->lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
trie_delete_elem+0x94/0x630 kernel/bpf/lpm_trie.c:466
bpf_prog_18dbf0bb98c5951f+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:617 [inline]
bpf_prog_run include/linux/filter.h:624 [inline]
bpf_prog_run_array include/linux/bpf.h:1994 [inline]
trace_call_bpf+0x333/0x6c0 kernel/trace/bpf_trace.c:143
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10287
perf_trace_lock_acquire+0x342/0x400 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
mod_objcg_mlstate+0xad/0x320 mm/memcontrol.c:2913
drain_obj_stock+0x154/0x3a0 mm/memcontrol.c:3321
refill_obj_stock+0x1fc/0x6a0 mm/memcontrol.c:3370
memcg_slab_free_hook+0x123/0x200 mm/slab.h:576
slab_free mm/slub.c:3825 [inline]
kmem_cache_free+0xe1/0x290 mm/slub.c:3852
rcu_do_batch kernel/rcu/tree.c:2194 [inline]
rcu_core+0x9c1/0x17f0 kernel/rcu/tree.c:2467
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
bytes_is_nonzero mm/kasan/generic.c:85 [inline]
memory_is_nonzero mm/kasan/generic.c:102 [inline]
memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
memory_is_poisoned mm/kasan/generic.c:159 [inline]
check_region_inline mm/kasan/generic.c:178 [inline]
kasan_check_range+0x89/0x290 mm/kasan/generic.c:187
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:3160 [inline]
filp_flush fs/open.c:1527 [inline]
filp_close+0x34/0x150 fs/open.c:1547
__range_close fs/file.c:698 [inline]
__close_range+0x379/0x690 fs/file.c:755
__do_sys_close_range fs/open.c:1600 [inline]
__se_sys_close_range fs/open.c:1597 [inline]
__x64_sys_close_range+0x7a/0x90 fs/open.c:1597
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(stock_lock);
lock(&trie->lock);
lock(stock_lock);
lock(&trie->lock);
*** DEADLOCK ***
3 locks held by syz.0.4015/19078:
#0: ffffffff8d131ec0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131ec0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2188 [inline]
#0: ffffffff8d131ec0 (rcu_callback){....}-{0:0}, at: rcu_core+0x951/0x17f0 kernel/rcu/tree.c:2467
#1: ffff8880b8f37de8 (stock_lock){-.-.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
#1: ffff8880b8f37de8 (stock_lock){-.-.}-{2:2}, at: refill_obj_stock+0xef/0x6a0 mm/memcontrol.c:3366
#2: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#2: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#2: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: trace_call_bpf+0xc3/0x6c0 kernel/trace/bpf_trace.c:142
stack backtrace:
CPU: 1 PID: 19078 Comm: syz.0.4015 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
trie_delete_elem+0x94/0x630 kernel/bpf/lpm_trie.c:466
bpf_prog_18dbf0bb98c5951f+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:617 [inline]
bpf_prog_run include/linux/filter.h:624 [inline]
bpf_prog_run_array include/linux/bpf.h:1994 [inline]
trace_call_bpf+0x333/0x6c0 kernel/trace/bpf_trace.c:143
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10287
perf_trace_lock_acquire+0x342/0x400 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
mod_objcg_mlstate+0xad/0x320 mm/memcontrol.c:2913
drain_obj_stock+0x154/0x3a0 mm/memcontrol.c:3321
refill_obj_stock+0x1fc/0x6a0 mm/memcontrol.c:3370
memcg_slab_free_hook+0x123/0x200 mm/slab.h:576
slab_free mm/slub.c:3825 [inline]
kmem_cache_free+0xe1/0x290 mm/slub.c:3852
rcu_do_batch kernel/rcu/tree.c:2194 [inline]
rcu_core+0x9c1/0x17f0 kernel/rcu/tree.c:2467
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x89/0x290 mm/kasan/generic.c:187
Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd
RSP: 0018:ffffc90010befdb0 EFLAGS: 00000246
RAX: ffffffff81ee8d01 RBX: ffffffffffffffff RCX: ffffffff81ee8d94
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880261e3458
RBP: ffffc90010befee8 R08: ffff8880261e345f R09: 1ffff11004c3c68b
R10: dffffc0000000000 R11: ffffed1004c3c68b R12: 0000000000000001
R13: dffffc0000000000 R14: ffffed1004c3c68c R15: 1ffff11004c3c68b
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:3160 [inline]
filp_flush fs/open.c:1527 [inline]
filp_close+0x34/0x150 fs/open.c:1547
__range_close fs/file.c:698 [inline]
__close_range+0x379/0x690 fs/file.c:755
__do_sys_close_range fs/open.c:1600 [inline]
__se_sys_close_range fs/open.c:1597 [inline]
__x64_sys_close_range+0x7a/0x90 fs/open.c:1597
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb8ec19e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd48cd0318 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007ffd48cd0400 RCX: 00007fb8ec19e019
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000138c48 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2ff20000 R11: 0000000000000246 R12: 00007ffd48cd0440
R13: 00007fb8ec425fac R14: 0000000000138c9b R15: 00007fb8ec425fa0
----------------
Code disassembly (best guess):
0: 00 fc add %bh,%ah
2: ff lcall (bad)
3: df 4d 8d fisttps -0x73(%rbp)
6: 34 19 xor $0x19,%al
8: 4d 89 f4 mov %r14,%r12
b: 4d 29 dc sub %r11,%r12
e: 49 83 fc 10 cmp $0x10,%r12
12: 7f 29 jg 0x3d
14: 4d 85 e4 test %r12,%r12
17: 0f 84 3d 01 00 00 je 0x15a
1d: 4c 89 cb mov %r9,%rbx
20: 48 f7 d3 not %rbx
23: 4c 01 fb add %r15,%rbx
26: 41 80 3b 00 cmpb $0x0,(%r11)
* 2a: 0f 85 8d 01 00 00 jne 0x1bd <-- trapping instruction
30: 49 ff c3 inc %r11
33: 48 ff c3 inc %rbx
36: 75 ee jne 0x26
38: e9 1d 01 00 00 jmp 0x15a
3d: 44 89 dd mov %r11d,%ebp