syzbot

======================================================
WARNING: possible circular locking dependency detected
5.6.0-rc2-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor253/9751 is trying to acquire lock:
ffff888098b1eae0 (&htab->buckets[i].lock){....}, at: htab_lru_map_delete_node+0xce/0x2f0 kernel/bpf/hashtab.c:593

but task is already holding lock:
ffff8880973ee218 (&l->lock){....}, at: bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:325 [inline]
ffff8880973ee218 (&l->lock){....}, at: bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
ffff8880973ee218 (&l->lock){....}, at: bpf_lru_pop_free+0x67f/0x1670 kernel/bpf/bpf_lru_list.c:499

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&l->lock){....}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
       bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:325 [inline]
       bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
       bpf_lru_pop_free+0x67f/0x1670 kernel/bpf/bpf_lru_list.c:499
       prealloc_lru_pop+0x2c/0xa0 kernel/bpf/hashtab.c:132
       __htab_lru_percpu_map_update_elem+0x67e/0xa90 kernel/bpf/hashtab.c:1069
       bpf_percpu_hash_update+0x16e/0x210 kernel/bpf/hashtab.c:1585
       bpf_map_update_value.isra.0+0x2d7/0x8e0 kernel/bpf/syscall.c:181
       generic_map_update_batch+0x41f/0x610 kernel/bpf/syscall.c:1319
       bpf_map_do_batch+0x3f5/0x510 kernel/bpf/syscall.c:3348
       __do_sys_bpf+0x9b7/0x41e0 kernel/bpf/syscall.c:3460
       __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
       __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3355
       do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&loc_l->lock){....}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
       bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:516 [inline]
       bpf_lru_push_free+0x250/0x5b0 kernel/bpf/bpf_lru_list.c:555
       __htab_map_lookup_and_delete_batch+0x8d4/0x1540 kernel/bpf/hashtab.c:1374
       htab_lru_map_lookup_and_delete_batch+0x34/0x40 kernel/bpf/hashtab.c:1491
       bpf_map_do_batch+0x3f5/0x510 kernel/bpf/syscall.c:3348
       __do_sys_bpf+0x1f7d/0x41e0 kernel/bpf/syscall.c:3456
       __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
       __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3355
       do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&htab->buckets[i].lock){....}:
       check_prev_add kernel/locking/lockdep.c:2475 [inline]
       check_prevs_add kernel/locking/lockdep.c:2580 [inline]
       validate_chain kernel/locking/lockdep.c:2970 [inline]
       __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3954
       lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
       htab_lru_map_delete_node+0xce/0x2f0 kernel/bpf/hashtab.c:593
       __bpf_lru_list_shrink_inactive kernel/bpf/bpf_lru_list.c:220 [inline]
       __bpf_lru_list_shrink+0xf9/0x470 kernel/bpf/bpf_lru_list.c:266
       bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:340 [inline]
       bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
       bpf_lru_pop_free+0x87c/0x1670 kernel/bpf/bpf_lru_list.c:499
       prealloc_lru_pop+0x2c/0xa0 kernel/bpf/hashtab.c:132
       __htab_lru_percpu_map_update_elem+0x67e/0xa90 kernel/bpf/hashtab.c:1069
       bpf_percpu_hash_update+0x16e/0x210 kernel/bpf/hashtab.c:1585
       bpf_map_update_value.isra.0+0x2d7/0x8e0 kernel/bpf/syscall.c:181
       generic_map_update_batch+0x41f/0x610 kernel/bpf/syscall.c:1319
       bpf_map_do_batch+0x3f5/0x510 kernel/bpf/syscall.c:3348
       __do_sys_bpf+0x9b7/0x41e0 kernel/bpf/syscall.c:3460
       __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
       __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3355
       do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &htab->buckets[i].lock --> &loc_l->lock --> &l->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&l->lock);
                               lock(&loc_l->lock);
                               lock(&l->lock);
  lock(&htab->buckets[i].lock);

 *** DEADLOCK ***

3 locks held by syz-executor253/9751:
 #0: ffffffff89bac240 (rcu_read_lock){....}, at: bpf_percpu_hash_update+0x0/0x210 kernel/bpf/hashtab.c:1565
 #1: ffffe8ffffc784c8 (&loc_l->lock){....}, at: bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:443 [inline]
 #1: ffffe8ffffc784c8 (&loc_l->lock){....}, at: bpf_lru_pop_free+0x32b/0x1670 kernel/bpf/bpf_lru_list.c:499
 #2: ffff8880973ee218 (&l->lock){....}, at: bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:325 [inline]
 #2: ffff8880973ee218 (&l->lock){....}, at: bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
 #2: ffff8880973ee218 (&l->lock){....}, at: bpf_lru_pop_free+0x67f/0x1670 kernel/bpf/bpf_lru_list.c:499

stack backtrace:
CPU: 0 PID: 9751 Comm: syz-executor253 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1684
 check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1808
 check_prev_add kernel/locking/lockdep.c:2475 [inline]
 check_prevs_add kernel/locking/lockdep.c:2580 [inline]
 validate_chain kernel/locking/lockdep.c:2970 [inline]
 __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3954
 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
 htab_lru_map_delete_node+0xce/0x2f0 kernel/bpf/hashtab.c:593
 __bpf_lru_list_shrink_inactive kernel/bpf/bpf_lru_list.c:220 [inline]
 __bpf_lru_list_shrink+0xf9/0x470 kernel/bpf/bpf_lru_list.c:266
 bpf_lru_list_pop_free_to_local kernel/bpf/bpf_lru_list.c:340 [inline]
 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:447 [inline]
 bpf_lru_pop_free+0x87c/0x1670 kernel/bpf/bpf_lru_list.c:499
 prealloc_lru_pop+0x2c/0xa0 kernel/bpf/hashtab.c:132
 __htab_lru_percpu_map_update_elem+0x67e/0xa90 kernel/bpf/hashtab.c:1069
 bpf_percpu_hash_update+0x16e/0x210 kernel/bpf/hashtab.c:1585
 bpf_map_update_value.isra.0+0x2d7/0x8e0 kernel/bpf/syscall.c:181
 generic_map_update_batch+0x41f/0x610 kernel/bpf/syscall.c:1319
 bpf_map_do_batch+0x3f5/0x510 kernel/bpf/syscall.c:3348
 __do_sys_bpf+0x9b7/0x41e0 kernel/bpf/syscall.c:3460
 __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:3355
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449499
Code: e8 ec 0e 03 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 ab 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa6d86dcdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000006dec28 RCX: 0000000000449499
RDX: 0000000000000038 RSI: 0000000020000040 RDI: 000000000000001a
RBP: 00000000006dec20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dec2c
R13: 00007ffc6bea610f R14: 00007fa6d86dd9c0 R15: 0000000000000000