rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (0 ticks this GP) idle=677/1/0x4000000000000002 softirq=21633/21633 fqs=2095
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9518
(detected by 1, t=10504 jiffies, g=30389, q=3142)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9518 Comm: syz.3.1858 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__lock_acquire+0xdd8/0x7d10 kernel/locking/lockdep.c:4982
Code: 48 89 cb 48 8d 3c c5 c0 50 1d 90 be 08 00 00 00 e8 3d 31 61 00 49 b8 00 00 00 00 00 fc ff df 48 63 c3 48 0f a3 05 f8 2c c0 0e <0f> 83 03 4e 00 00 49 8d 9d e0 0a 00 00 49 89 de 49 c1 ee 03 43 80
RSP: 0018:ffffc90000007300 EFLAGS: 00000057
RAX: 0000000000000015 RBX: 0000000000000015 RCX: ffffffff815d23b3
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d50c0
RBP: ffffc90000007550 R08: dffffc0000000000 R09: 1ffffffff203aa18
R10: dffffc0000000000 R11: fffffbfff203aa19 R12: ffff88802139c730
R13: ffff88802139bb80 R14: ffffffff8fb5dff8 R15: ffff88802139c710
FS: 00007f6a924816c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000480 CR3: 000000007b9e4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_output_begin kernel/events/ring_buffer.c:163 [inline]
perf_output_begin_forward+0xa5/0xa40 kernel/events/ring_buffer.c:271
__perf_event_output kernel/events/core.c:7804 [inline]
perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a9/0x830 kernel/softirq.c:564
Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 00 10 2a 8a e8 2b 89 73 08 65 66 c7 05 51 47 ba 7e 00 00 e8 9c 0e 36 00 fb 89 5c 24 34 ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 d2 00 00 00
RSP: 0018:ffffc90000007e20 EFLAGS: 00000282
RAX: 1500e26f1ac5f200 RBX: 0000000000000200 RCX: 1500e26f1ac5f200
RDX: dffffc0000000000 RSI: ffffffff8a2b2800 RDI: ffffffff8a79fe00
RBP: ffffc90000007f30 R08: ffffffff901d50e7 R09: 1ffffffff203aa1c
R10: dffffc0000000000 R11: fffffbfff203aa1d R12: 000000000000000a
R13: 0000000000000000 R14: ffff88802139bb80 R15: dffffc0000000000
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_read_unlock_special+0x1/0x4a0 kernel/rcu/tree_plugin.h:625
Code: c5 58 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 3c c5 58 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 00
RSP: 0018:ffffc90002fee7b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802139bfbc RCX: 1500e26f1ac5f200
RDX: 0000000000000000 RSI: ffffffff8a79fde0 RDI: ffff88802139bb80
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff203aa18
R10: dffffc0000000000 R11: fffffbfff203aa19 R12: 1ffff110042737f7
R13: 0000000000000001 R14: ffff88802139bfc0 R15: dffffc0000000000
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:324 [inline]
percpu_ref_put include/linux/percpu-refcount.h:338 [inline]
obj_cgroup_put+0xa4/0xc0 include/linux/memcontrol.h:816
memcg_slab_free_hook+0x6f/0x1f0 mm/slab.h:367
do_slab_free mm/slub.c:3437 [inline]
___cache_free+0x63/0x120 mm/slub.c:3511
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3225 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
kmem_cache_zalloc include/linux/slab.h:728 [inline]
__alloc_file+0x25/0x240 fs/file_table.c:132
alloc_empty_file+0x90/0x180 fs/file_table.c:181
path_openat+0x10f/0x2fa0 fs/namei.c:3736
do_file_open_root+0x2e5/0x6b0 fs/namei.c:3802
file_open_root+0x163/0x1c0 fs/open.c:1235
kernel_read_file_from_path_initns+0x14d/0x220 fs/kernel_read_file.c:163
fw_get_filesystem_firmware+0x380/0x990 drivers/base/firmware_loader/main.c:536
_request_firmware+0x9a1/0x12b0 drivers/base/firmware_loader/main.c:856
request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:925
reg_reload_regdb+0x8d/0x1e0 net/wireless/reg.c:1113
genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
genl_rcv_msg+0xcea/0xf90 net/netlink/genetlink.c:792
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
__sys_sendmsg net/socket.c:2528 [inline]
__do_sys_sendmsg net/socket.c:2537 [inline]
__se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6a94227dd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6a92481028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6a944a0fa0 RCX: 00007f6a94227dd9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000c
RBP: 00007f6a942bdd69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a944a1038 R14: 00007f6a944a0fa0 R15: 00007ffea879f238
task:syz.3.1858 state:R running task stack:22128 pid: 9518 ppid: 4190 flags:0x0000400e
Call Trace: