======================================================
WARNING: possible circular locking dependency detected
6.10.0-syzkaller-12562-g1722389b0d86 #0 Not tainted
------------------------------------------------------
syz.3.2008/13576 is trying to acquire lock:
ffff88803fffece0 (&pgdat->kswapd_wait){..-.}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:105 [inline]
ffff88803fffece0 (&pgdat->kswapd_wait){..-.}-{2:2}, at: __wake_up+0x1c/0x60 kernel/sched/wait.c:127
but task is already holding lock:
ffff88802be969f8 (&trie->lock){-.-.}-{2:2}, at: trie_update_elem+0xc7/0xdb0 kernel/bpf/lpm_trie.c:333
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&trie->lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
trie_delete_elem+0xb0/0x820 kernel/bpf/lpm_trie.c:462
0xffffffffa000211a
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:691 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2447
__traceiter_tlb_flush+0x64/0xb0 include/trace/events/tlb.h:38
trace_tlb_flush+0xf3/0x170 include/trace/events/tlb.h:38
switch_mm_irqs_off+0x697/0xbb0 arch/x86/mm/tlb.c:642
context_switch kernel/sched/core.c:5172 [inline]
__schedule+0xc4d/0x5490 kernel/sched/core.c:6529
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:6851
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
task_css include/linux/cgroup.h:433 [inline]
mem_cgroup_from_task mm/memcontrol.c:890 [inline]
get_mem_cgroup_from_mm+0x20b/0x5f0 mm/memcontrol.c:943
__mem_cgroup_charge+0x1a/0x270 mm/memcontrol.c:4435
mem_cgroup_charge include/linux/memcontrol.h:671 [inline]
folio_prealloc mm/memory.c:1068 [inline]
wp_page_copy mm/memory.c:3335 [inline]
do_wp_page+0xf88/0x3360 mm/memory.c:3727
handle_pte_fault mm/memory.c:5538 [inline]
__handle_mm_fault+0x234b/0x5360 mm/memory.c:5665
handle_mm_fault+0x44e/0x7b0 mm/memory.c:5833
do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_iovec include/linux/iov_iter.h:51 [inline]
iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x48f/0xfc0 lib/iov_iter.c:185
copy_page_to_iter lib/iov_iter.c:362 [inline]
copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:349
process_vm_rw_pages mm/process_vm_access.c:45 [inline]
process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
process_vm_rw_core.constprop.0+0x5c9/0xa10 mm/process_vm_access.c:216
process_vm_rw+0x301/0x360 mm/process_vm_access.c:284
__do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
__se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
__ia32_sys_process_vm_readv+0xdf/0x1b0 mm/process_vm_access.c:292
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #2 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:560
raw_spin_rq_lock kernel/sched/sched.h:1415 [inline]
rq_lock kernel/sched/sched.h:1714 [inline]
task_fork_fair+0x73/0x250 kernel/sched/fair.c:12710
sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4633
copy_process+0x4710/0x6f50 kernel/fork.c:2483
kernel_clone+0xfd/0x980 kernel/fork.c:2781
user_mode_thread+0xb4/0xf0 kernel/fork.c:2859
rest_init+0x23/0x2b0 init/main.c:712
start_kernel+0x3df/0x4c0 init/main.c:1103
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x148
-> #1 (&p->pi_lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
try_to_wake_up+0x9a/0x13e0 kernel/sched/core.c:4051
autoremove_wake_function+0x16/0x150 kernel/sched/wait.c:384
__wake_up_common+0x131/0x1e0 kernel/sched/wait.c:89
__wake_up_common_lock kernel/sched/wait.c:106 [inline]
__wake_up+0x31/0x60 kernel/sched/wait.c:127
wakeup_kswapd+0x45e/0x640 mm/vmscan.c:7283
rmqueue mm/page_alloc.c:3046 [inline]
get_page_from_freelist+0x9bb/0x2e50 mm/page_alloc.c:3435
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4696
alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2263
folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2281
vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2312
folio_prealloc mm/memory.c:1060 [inline]
alloc_anon_folio mm/memory.c:4498 [inline]
do_anonymous_page mm/memory.c:4555 [inline]
do_pte_missing mm/memory.c:3945 [inline]
handle_pte_fault mm/memory.c:5522 [inline]
__handle_mm_fault+0x2d18/0x5360 mm/memory.c:5665
handle_mm_fault+0x44e/0x7b0 mm/memory.c:5833
do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
-> #0 (&pgdat->kswapd_wait){..-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:105 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:127
wakeup_kswapd+0x45e/0x640 mm/vmscan.c:7283
rmqueue mm/page_alloc.c:3046 [inline]
get_page_from_freelist+0x9bb/0x2e50 mm/page_alloc.c:3435
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4696
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
___kmalloc_large_node+0x7f/0x1a0 mm/slub.c:4103
__kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4130
__do_kmalloc_node mm/slub.c:4146 [inline]
__kmalloc_node_noprof.cold+0x5/0x5f mm/slub.c:4164
kmalloc_node_noprof include/linux/slab.h:708 [inline]
bpf_map_kmalloc_node+0x98/0x4a0 kernel/bpf/syscall.c:422
lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline]
trie_update_elem+0x1ef/0xdb0 kernel/bpf/lpm_trie.c:342
bpf_map_update_value+0x2c1/0x6c0 kernel/bpf/syscall.c:203
generic_map_update_batch+0x454/0x5f0 kernel/bpf/syscall.c:1889
bpf_map_do_batch+0x615/0x6e0 kernel/bpf/syscall.c:5218
__sys_bpf+0x1fad/0x5600 kernel/bpf/syscall.c:5774
__do_sys_bpf kernel/bpf/syscall.c:5817 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5815 [inline]
__ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5815
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
&pgdat->kswapd_wait --> &rq->__lock --> &trie->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&trie->lock);
lock(&rq->__lock);
lock(&trie->lock);
lock(&pgdat->kswapd_wait);
*** DEADLOCK ***
2 locks held by syz.3.2008/13576:
#0: ffffffff8ddb89a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8ddb89a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8ddb89a0 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x24b/0x6c0 kernel/bpf/syscall.c:202
#1: ffff88802be969f8 (&trie->lock){-.-.}-{2:2}, at: trie_update_elem+0xc7/0xdb0 kernel/bpf/lpm_trie.c:333
stack backtrace:
CPU: 1 UID: 0 PID: 13576 Comm: syz.3.2008 Not tainted 6.10.0-syzkaller-12562-g1722389b0d86 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:105 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:127
wakeup_kswapd+0x45e/0x640 mm/vmscan.c:7283
rmqueue mm/page_alloc.c:3046 [inline]
get_page_from_freelist+0x9bb/0x2e50 mm/page_alloc.c:3435
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4696
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
___kmalloc_large_node+0x7f/0x1a0 mm/slub.c:4103
__kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4130
__do_kmalloc_node mm/slub.c:4146 [inline]
__kmalloc_node_noprof.cold+0x5/0x5f mm/slub.c:4164
kmalloc_node_noprof include/linux/slab.h:708 [inline]
bpf_map_kmalloc_node+0x98/0x4a0 kernel/bpf/syscall.c:422
lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline]
trie_update_elem+0x1ef/0xdb0 kernel/bpf/lpm_trie.c:342
bpf_map_update_value+0x2c1/0x6c0 kernel/bpf/syscall.c:203
generic_map_update_batch+0x454/0x5f0 kernel/bpf/syscall.c:1889
bpf_map_do_batch+0x615/0x6e0 kernel/bpf/syscall.c:5218
__sys_bpf+0x1fad/0x5600 kernel/bpf/syscall.c:5774
__do_sys_bpf kernel/bpf/syscall.c:5817 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5815 [inline]
__ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5815
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f28579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f56d657c EFLAGS: 00000292 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000001a RCX: 0000000020000300
RDX: 0000000000000038 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi