[v6.1] possible deadlock in get_partial_node (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 52f863f820fd Linux 6.1.120
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10aa22df980000
kernel config: https://syzkaller.appspot.com/x/.config?x=aaac18cfcaf804f1
dashboard link: https://syzkaller.appspot.com/bug?extid=3d80debb66cbd75ea2a0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f1ea31c701c9/disk-52f863f8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/79e3c885e5a2/vmlinux-52f863f8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/355a57190120/bzImage-52f863f8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3d80de...@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
6.1.120-syzkaller-00773-g52f863f820fd #0 Tainted: G W
------------------------------------------------------
syz.3.302/5273 is trying to acquire lock:
ffff888017c43318 (&n->list_lock){-.-.}-{2:2}, at: get_partial_node+0x36/0x450 mm/slub.c:2210

but task is already holding lock:
ffff88807b388a38 (&trie->lock){..-.}-{2:2}, at: trie_update_elem+0xc7/0xdd0 kernel/bpf/lpm_trie.c:335

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&trie->lock){..-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_682b67a395ac5c66+0xa/0x12
bpf_dispatcher_nop_func include/linux/bpf.h:992 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline]
bpf_trace_run2+0x361/0x410 kernel/trace/bpf_trace.c:2312
trace_contention_end+0x14c/0x190 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0x935/0xc50 kernel/locking/qspinlock.c:560
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x269/0x370 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xdd/0x120 kernel/locking/spinlock.c:162
__unfreeze_partials+0x97/0x210 mm/slub.c:2550
put_cpu_partial+0x17b/0x250 mm/slub.c:2662
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
__kmem_cache_alloc_node+0x137/0x260 mm/slub.c:3437
kmalloc_node_trace+0x23/0xe0 mm/slab_common.c:1039
kmalloc_node include/linux/slab.h:585 [inline]
kzalloc_node include/linux/slab.h:710 [inline]
__get_vm_area_node+0x126/0x360 mm/vmalloc.c:2498
__vmalloc_node_range+0x37d/0x14b0 mm/vmalloc.c:3193
__vmalloc_node mm/vmalloc.c:3298 [inline]
__vmalloc+0x75/0x80 mm/vmalloc.c:3312
bpf_prog_alloc_no_stats+0x34/0x3f0 kernel/bpf/core.c:92
bpf_prog_alloc+0x1c/0x1b0 kernel/bpf/core.c:130
bpf_prog_load+0x803/0x1bb0 kernel/bpf/syscall.c:2592
__sys_bpf+0x382/0x6c0 kernel/bpf/syscall.c:5020
__do_sys_bpf kernel/bpf/syscall.c:5124 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5122 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&n->list_lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
get_partial_node+0x36/0x450 mm/slub.c:2210
get_partial mm/slub.c:2325 [inline]
___slab_alloc+0x9b2/0x1270 mm/slub.c:3175
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node+0xa2/0x230 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
bpf_map_kmalloc_node+0xce/0x1c0 kernel/bpf/syscall.c:452
lpm_trie_node_alloc kernel/bpf/lpm_trie.c:291 [inline]
trie_update_elem+0x176/0xdd0 kernel/bpf/lpm_trie.c:338
bpf_map_update_value+0x5cf/0x6f0 kernel/bpf/syscall.c:226
map_update_elem+0x503/0x680 kernel/bpf/syscall.c:1463
__sys_bpf+0x337/0x6c0 kernel/bpf/syscall.c:5008
__do_sys_bpf kernel/bpf/syscall.c:5124 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5122 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&trie->lock);
lock(&n->list_lock);
lock(&trie->lock);
lock(&n->list_lock);

*** DEADLOCK ***

2 locks held by syz.3.302/5273:
#0: ffffffff8d32b080 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32b080 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32b080 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x207/0x6f0 kernel/bpf/syscall.c:225
#1: ffff88807b388a38 (&trie->lock){..-.}-{2:2}, at: trie_update_elem+0xc7/0xdd0 kernel/bpf/lpm_trie.c:335

stack backtrace:
CPU: 1 PID: 5273 Comm: syz.3.302 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
get_partial_node+0x36/0x450 mm/slub.c:2210
get_partial mm/slub.c:2325 [inline]
___slab_alloc+0x9b2/0x1270 mm/slub.c:3175
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node+0xa2/0x230 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
bpf_map_kmalloc_node+0xce/0x1c0 kernel/bpf/syscall.c:452
lpm_trie_node_alloc kernel/bpf/lpm_trie.c:291 [inline]
trie_update_elem+0x176/0xdd0 kernel/bpf/lpm_trie.c:338
bpf_map_update_value+0x5cf/0x6f0 kernel/bpf/syscall.c:226
map_update_elem+0x503/0x680 kernel/bpf/syscall.c:1463
__sys_bpf+0x337/0x6c0 kernel/bpf/syscall.c:5008
__do_sys_bpf kernel/bpf/syscall.c:5124 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5122 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd75f585d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd76043f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd75f775fa0 RCX: 00007fd75f585d29
RDX: 0000000000000020 RSI: 00000000200004c0 RDI: 0000000000000002
RBP: 00007fd75f601a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd75f775fa0 R15: 00007ffd94a448f8
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.