============================================
WARNING: possible recursive locking detected
6.1.138-syzkaller #0 Not tainted
--------------------------------------------
syz.3.66/4502 is trying to acquire lock:
ffff888057202a18 (&qs->lock){..-.}-{2:2}, at: __stack_map_get+0x11a/0x440 kernel/bpf/queue_stack_maps.c:144
but task is already holding lock:
ffff888057202a18 (&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
6 locks held by syz.3.66/4502:
#0: ffff88807ada6460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393
#1: ffffffff8cf363a8 (tomoyo_ss){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#1: ffffffff8cf363a8 (tomoyo_ss){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline]
#1: ffffffff8cf363a8 (tomoyo_ss){....}-{0:0}, at: tomoyo_read_lock security/tomoyo/common.h:1110 [inline]
#1: ffffffff8cf363a8 (tomoyo_ss){....}-{0:0}, at: tomoyo_check_open_permission+0x156/0x380 security/tomoyo/file.c:767
#2: ffffffff8c92aa80 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#2: ffffffff8c92aa80 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2291 [inline]
#2: ffffffff8c92aa80 (rcu_callback){....}-{0:0}, at: rcu_core+0x94e/0x16a0 kernel/rcu/tree.c:2557
#3: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#3: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#3: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
#3: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0xf0/0x400 kernel/trace/bpf_trace.c:2325
#4: ffff888057202a18 (&qs->lock){..-.}-{2:2}, at: queue_stack_map_push_elem+0x16c/0x5e0 kernel/bpf/queue_stack_maps.c:214
#5: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#5: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#5: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
#5: ffffffff8c92a960 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xda/0x3b0 kernel/trace/bpf_trace.c:2324
stack backtrace:
CPU: 1 PID: 4502 Comm: syz.3.66 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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
__stack_map_get+0x11a/0x440 kernel/bpf/queue_stack_maps.c:144
bpf_prog_94b194d4ebfffdd5+0x3d/0x41
bpf_dispatcher_nop_func include/linux/bpf.h:1001 [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:1001 [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_run3+0x1e3/0x400 kernel/trace/bpf_trace.c:2325
__bpf_trace_kmem_cache_free+0x99/0xc0 include/trace/events/kmem.h:114
trace_kmem_cache_free include/trace/events/kmem.h:114 [inline]
kmem_cache_free+0x1ef/0x290 mm/slub.c:3682
rcu_do_batch kernel/rcu/tree.c:2297 [inline]
rcu_core+0x9c0/0x16a0 kernel/rcu/tree.c:2557
handle_softirqs+0x2a1/0x920 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661
irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_latency_start kernel/sched/core.c:5693 [inline]
RIP: 0010:preempt_count_add+0xa2/0x190 kernel/sched/core.c:5716
Code: ff ff ff 7f 39 f8 75 42 48 8b 5c 24 18 48 89 df e8 83 6d 0c 00 85 c0 74 09 31 db 31 ff e8 76 6d 0c 00 65 4c 8b 35 ee c5 aa 7e <49> 81 c6 d8 14 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c
RSP: 0018:ffffc900051bf150 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8138551f RCX: ffffffff969bf100
RDX: dffffc0000000000 RSI: ffffffff81d21e0b RDI: ffffffff8138551f
RBP: ffffc900051bf290 R08: ffffc900051bf310 R09: 0000000000000000
R10: fffff52000a37e55 R11: 1ffff92000a37e53 R12: ffffffff81d21e0b
R13: ffffc900051bf380 R14: ffff8880276d3b80 R15: dffffc0000000000
unwind_next_frame+0xaf/0x20b0 arch/x86/kernel/unwind_orc.c:433
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3674
tomoyo_check_open_permission+0x2ab/0x380 security/tomoyo/file.c:786
security_file_open+0x5e/0xa0 security/security.c:1681
do_dentry_open+0x305/0x10d0 fs/open.c:869
do_open fs/namei.c:3626 [inline]
path_openat+0x25c6/0x2e70 fs/namei.c:3783
do_filp_open+0x1c1/0x3c0 fs/namei.c:3810
do_sys_openat2+0x142/0x490 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1345
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: 0033:0x7f3a0c98e969
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:00007f3a0d788038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3a0cbb6080 RCX: 00007f3a0c98e969
RDX: 000000000000275a RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f3a0ca10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3a0cbb6080 R15: 00007ffd08bf1fd8
----------------
Code disassembly (best guess), 3 bytes skipped:
0: 7f 39 jg 0x3b
2: f8 clc
3: 75 42 jne 0x47
5: 48 8b 5c 24 18 mov 0x18(%rsp),%rbx
a: 48 89 df mov %rbx,%rdi
d: e8 83 6d 0c 00 call 0xc6d95
12: 85 c0 test %eax,%eax
14: 74 09 je 0x1f
16: 31 db xor %ebx,%ebx
18: 31 ff xor %edi,%edi
1a: e8 76 6d 0c 00 call 0xc6d95
1f: 65 4c 8b 35 ee c5 aa mov %gs:0x7eaac5ee(%rip),%r14 # 0x7eaac615
26: 7e
* 27: 49 81 c6 d8 14 00 00 add $0x14d8,%r14 <-- trapping instruction
2e: 4c 89 f0 mov %r14,%rax
31: 48 c1 e8 03 shr $0x3,%rax
35: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
3a: 74 08 je 0x44
3c: 4c rex.WR