============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.1.1247/9622 is trying to acquire lock:
ffff88807d45e218 (&qs->lock){-.-.}-{2:2}, at: queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
but task is already holding lock:
ffff88802661a218 (&qs->lock){-.-.}-{2:2}, at: queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&qs->lock);
lock(&qs->lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
8 locks held by syz.1.1247/9622:
#0: ffffffff8cbc5010 (dup_mmap_sem){++++}-{0:0}, at: dup_mmap kernel/fork.c:593 [inline]
#0: ffffffff8cbc5010 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1541 [inline]
#0: ffffffff8cbc5010 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x2a9/0x15c0 kernel/fork.c:1590
#1: ffff88801746f958 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#1: ffff88801746f958 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:594 [inline]
#1: ffff88801746f958 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1541 [inline]
#1: ffff88801746f958 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm+0x2c3/0x15c0 kernel/fork.c:1590
#2: ffff88801746a6d8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:78 [inline]
#2: ffff88801746a6d8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:603 [inline]
#2: ffff88801746a6d8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1541 [inline]
#2: ffff88801746a6d8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm+0x3ad/0x15c0 kernel/fork.c:1590
#3: ffff8880267438f8 (&anon_vma->rwsem){++++}-{3:3}, at: lock_anon_vma_root mm/rmap.c:250 [inline]
#3: ffff8880267438f8 (&anon_vma->rwsem){++++}-{3:3}, at: anon_vma_clone+0x121/0x4e0 mm/rmap.c:296
#4: ffff8880b8e2a598 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
#4: ffff8880b8e2a598 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x63a/0xd60 kernel/time/hrtimer.c:1811
#5: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#5: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#5: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
#5: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xda/0x3b0 kernel/trace/bpf_trace.c:2324
#6: ffff88802661a218 (&qs->lock){-.-.}-{2:2}, at: queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
#7: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#7: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#7: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
#7: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xda/0x3b0 kernel/trace/bpf_trace.c:2324
stack backtrace:
CPU: 0 PID: 9622 Comm: syz.1.1247 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
__lock_acquire+0x122f/0x7c50 kernel/locking/lockdep.c:-1
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
bpf_prog_80daba7f9ca62790+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2285 [inline]
bpf_trace_run2+0x1cd/0x3b0 kernel/trace/bpf_trace.c:2324
trace_contention_end+0x13f/0x190 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0x7e8/0x9c0 kernel/locking/qspinlock.c:560
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x217/0x280 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb0/0xf0 kernel/locking/spinlock.c:162
queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
bpf_prog_80daba7f9ca62790+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2285 [inline]
bpf_trace_run2+0x1cd/0x3b0 kernel/trace/bpf_trace.c:2324
trace_hrtimer_start include/trace/events/timer.h:202 [inline]
debug_activate kernel/time/hrtimer.c:504 [inline]
enqueue_hrtimer+0x36e/0x3f0 kernel/time/hrtimer.c:1105
__run_hrtimer kernel/time/hrtimer.c:1764 [inline]
__hrtimer_run_queues+0x68e/0xd60 kernel/time/hrtimer.c:1811
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:mod_objcg_state+0x595/0x890 mm/memcontrol.c:3218
Code: c0 00 00 00 0f 85 6e 01 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 47 30 40 08 f7 c3 00 02 00 00 74 9c fb 4d 85 ff <75> 9b eb a1 e8 62 5f 2c 02 85 c0 0f 84 b8 fb ff ff 48 c7 c0 68 9f
RSP: 0018:ffffc900036075a0 EFLAGS: 00000246
RAX: 39b1247da08f0500 RBX: 0000000000000a06 RCX: 39b1247da08f0500
RDX: dffffc0000000000 RSI: ffffffff8a8c0580 RDI: ffffffff8adef760
RBP: ffffc900036076a8 R08: dffffc0000000000 R09: fffffbfff215c451
R10: fffffbfff215c451 R11: 1ffffffff215c450 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880b8e36910 R15: 0000000000000000
memcg_slab_post_alloc_hook mm/slab.h:537 [inline]
slab_post_alloc_hook+0x32e/0x480 mm/slab.h:745
slab_alloc_node mm/slub.c:3359 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
anon_vma_chain_alloc mm/rmap.c:141 [inline]
anon_vma_clone+0xb4/0x4e0 mm/rmap.c:287
anon_vma_fork+0x75/0x4f0 mm/rmap.c:350
dup_mmap kernel/fork.c:663 [inline]
dup_mm kernel/fork.c:1541 [inline]
copy_mm+0xb44/0x15c0 kernel/fork.c:1590
copy_process+0x1953/0x4020 kernel/fork.c:2351
kernel_clone+0x225/0x8b0 kernel/fork.c:2757
__do_sys_clone kernel/fork.c:2898 [inline]
__se_sys_clone kernel/fork.c:2882 [inline]
__x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2882
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9437d8f749
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:00007f9438bd6fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f9437fe6090 RCX: 00007f9437d8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0000000
RBP: 00007f9437e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f9437fe6128 R14: 00007f9437fe6090 R15: 00007ffd74786968
----------------
Code disassembly (best guess):
0: c0 00 00 rolb $0x0,(%rax)
3: 00 0f add %cl,(%rdi)
5: 85 6e 01 test %ebp,0x1(%rsi)
8: 00 00 add %al,(%rax)
a: 48 8d 65 d8 lea -0x28(%rbp),%rsp
e: 5b pop %rbx
f: 41 5c pop %r12
11: 41 5d pop %r13
13: 41 5e pop %r14
15: 41 5f pop %r15
17: 5d pop %rbp
18: c3 ret
19: e8 47 30 40 08 call 0x8403065
1e: f7 c3 00 02 00 00 test $0x200,%ebx
24: 74 9c je 0xffffffc2
26: fb sti
27: 4d 85 ff test %r15,%r15
* 2a: 75 9b jne 0xffffffc7 <-- trapping instruction
2c: eb a1 jmp 0xffffffcf
2e: e8 62 5f 2c 02 call 0x22c5f95
33: 85 c0 test %eax,%eax
35: 0f 84 b8 fb ff ff je 0xfffffbf3
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: c0 .byte 0xc0
3e: 68 .byte 0x68
3f: 9f lahf