============================================
WARNING: possible recursive locking detected
6.11.0-syzkaller-08829-gaf9c191ac2a0 #0 Not tainted
--------------------------------------------
syz.0.67/5572 is trying to acquire lock:
ffff88802426b9e0 (&qs->lock){..-.}-{2:2}, at: queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
but task is already holding lock:
ffff88805b3479e0 (&qs->lock){..-.}-{2:2}, at: queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
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
7 locks held by syz.0.67/5572:
#0: ffff88807ee54420 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
#1: ffff88807790e988 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]
#1: ffff88807790e988 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026
#2: ffffffff8e96c5e8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock include/linux/cgroup.h:368 [inline]
#2: ffffffff8e96c5e8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_kn_lock_live+0xe6/0x290 kernel/cgroup/cgroup.c:1662
#3: ffffffff8e937fa0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#3: ffffffff8e937fa0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2561 [inline]
#3: ffffffff8e937fa0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa37/0x17a0 kernel/rcu/tree.c:2823
#4: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#4: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#4: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2317 [inline]
#4: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2359
#5: ffff88805b3479e0 (&qs->lock){..-.}-{2:2}, at: queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
#6: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#6: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#6: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2317 [inline]
#6: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2359
stack backtrace:
CPU: 0 UID: 0 PID: 5572 Comm: syz.0.67 Not tainted 6.11.0-syzkaller-08829-gaf9c191ac2a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3034
check_deadlock kernel/locking/lockdep.c:3086 [inline]
validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3888
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5199
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
bpf_prog_216c997a1f42e404+0x40/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2359
trace_contention_end+0x114/0x140 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0xb7e/0xdb0 kernel/locking/qspinlock.c:557
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [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+0x272/0x370 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xe1/0x120 kernel/locking/spinlock.c:162
queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
bpf_prog_216c997a1f42e404+0x40/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2359
trace_kfree include/trace/events/kmem.h:94 [inline]
kfree+0x35e/0x440 mm/slub.c:4715
slab_free_after_rcu_debug+0x62/0x290 mm/slub.c:4617
rcu_do_batch kernel/rcu/tree.c:2567 [inline]
rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2823
handle_softirqs+0x2c7/0x980 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x18ed/0x22d0 arch/x86/kernel/unwind_orc.c:672
Code: 0c 01 75 40 80 3d c2 d2 d9 11 00 75 37 c6 05 b9 d2 d9 11 01 e9 21 fa ff ff bf 01 00 00 00 e8 9a c5 21 00 65 8b 0d ab 98 c2 7e 01 85 c9 75 73 e8 48 77 bf ff eb 6c 80 3d 4d 05 c5 0e 00 0f 84
RSP: 0018:ffffc900049c7630 EFLAGS: 00000297
RAX: 0000000080000001 RBX: ffffc900049c7710 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffc900049c0000 RDI: 0000000000000001
RBP: ffffc900049c7700 R08: ffffc900049c7ae0 R09: ffffc900049c7750
R10: dffffc0000000000 R11: fffff52000938eec R12: dffffc0000000000
R13: ffffc900049c7700 R14: ffffc900049c0000 R15: ffffc900049c7af0
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:257 [inline]
__do_kmalloc_node mm/slub.c:4265 [inline]
__kmalloc_noprof+0x1fc/0x400 mm/slub.c:4277
kmalloc_noprof include/linux/slab.h:882 [inline]
kmalloc_array_noprof include/linux/slab.h:923 [inline]
alloc_fair_sched_group+0xc4/0xa10 kernel/sched/fair.c:13315
sched_create_group+0x37/0x80 kernel/sched/core.c:8812
cpu_cgroup_css_alloc+0xe/0x40 kernel/sched/core.c:8972
css_create kernel/cgroup/cgroup.c:5631 [inline]
cgroup_apply_control_enable+0x39e/0xaf0 kernel/cgroup/cgroup.c:3239
cgroup_mkdir+0xa52/0xd30 kernel/cgroup/cgroup.c:5845
kernfs_iop_mkdir+0x255/0x3f0 fs/kernfs/dir.c:1246
vfs_mkdir+0x2fb/0x4f0 fs/namei.c:4257
do_mkdirat+0x264/0x3a0 fs/namei.c:4280
__do_sys_mkdir fs/namei.c:4300 [inline]
__se_sys_mkdir fs/namei.c:4298 [inline]
__x64_sys_mkdir+0x6c/0x80 fs/namei.c:4298
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8bfe77def9
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:00007f8bff63f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f8bfe935f80 RCX: 00007f8bfe77def9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f8bfe7f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8bfe935f80 R15: 00007ffe75370d78
----------------
Code disassembly (best guess):
0: 0c 01 or $0x1,%al
2: 75 40 jne 0x44
4: 80 3d c2 d2 d9 11 00 cmpb $0x0,0x11d9d2c2(%rip) # 0x11d9d2cd
b: 75 37 jne 0x44
d: c6 05 b9 d2 d9 11 01 movb $0x1,0x11d9d2b9(%rip) # 0x11d9d2cd
14: e9 21 fa ff ff jmp 0xfffffa3a
19: bf 01 00 00 00 mov $0x1,%edi
1e: e8 9a c5 21 00 call 0x21c5bd
23: 65 8b 0d ab 98 c2 7e mov %gs:0x7ec298ab(%rip),%ecx # 0x7ec298d5
* 2a: b0 01 mov $0x1,%al <-- trapping instruction
2c: 85 c9 test %ecx,%ecx
2e: 75 73 jne 0xa3
30: e8 48 77 bf ff call 0xffbf777d
35: eb 6c jmp 0xa3
37: 80 3d 4d 05 c5 0e 00 cmpb $0x0,0xec5054d(%rip) # 0xec5058b
3e: 0f .byte 0xf
3f: 84 .byte 0x84