Kernel bug: BUG: sleeping function called from invalid context in sock_map_delete_elem
Subsystem: bpf, net
Status: fixed

Crash report:
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6096, name: syz.0.28
preempt_count: 1, expected: 0
RCU nest depth: 1, expected: 1
3 locks held by syz.0.28/6096:
 #0: ffffffff8d3aa400 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8d3aa400 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #0: ffffffff8d3aa400 (rcu_read_lock){....}-{1:3}, at: bpf_test_timer_enter+0x1e/0x2b0 net/bpf/test_run.c:40
 #1: ffffffff8d24aa40 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0xa1/0x540 kernel/softirq.c:163
 #2: ffff8880310e62c0 (&stab->lock){+...}-{3:3}, at: spin_lock_bh include/linux/spinlock_rt.h:88 [inline]
 #2: ffff8880310e62c0 (&stab->lock){+...}-{3:3}, at: __sock_map_delete net/core/sock_map.c:421 [inline]
 #2: ffff8880310e62c0 (&stab->lock){+...}-{3:3}, at: sock_map_delete_elem+0xb7/0x170 net/core/sock_map.c:452
Preemption disabled at:
[<ffffffff88e51368>] bpf_test_timer_enter+0x158/0x2b0 net/bpf/test_run.c:42
CPU: 0 UID: 0 PID: 6096 Comm: syz.0.28 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __might_resched+0x44b/0x5d0 kernel/sched/core.c:8925
 __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
 rt_spin_lock+0xc7/0x3e0 kernel/locking/spinlock_rt.c:57
 spin_lock_bh include/linux/spinlock_rt.h:88 [inline]
 __sock_map_delete net/core/sock_map.c:421 [inline]
 sock_map_delete_elem+0xb7/0x170 net/core/sock_map.c:452
 bpf_prog_e78d8a1634f5e22d+0x46/0x4e
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:745 [inline]
 bpf_flow_dissect+0x225/0x720 net/core/flow_dissector.c:1024
 bpf_prog_test_run_flow_dissector+0x37c/0x5c0 net/bpf/test_run.c:1425
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4673
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f72c82deec9
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:00007fff31811128 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f72c8535fa0 RCX: 00007f72c82deec9
RDX: 0000000000000050 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007f72c8361f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72c8535fa0 R14: 00007f72c8535fa0 R15: 0000000000000003
 </TASK>