[v5.15] INFO: rcu detected stall in inet_release

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0996e0926f6b Linux 5.15.220
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11c22925580000
kernel config: https://syzkaller.appspot.com/x/.config?x=21845b39f8fc6be8
dashboard link: https://syzkaller.appspot.com/bug?extid=65c2fb1f0b89ce18d9e3
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0e6ad5d2c950/disk-0996e092.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a74b9e168496/vmlinux-0996e092.xz
kernel image: https://storage.googleapis.com/syzbot-assets/405e3cea6aca/bzImage-0996e092.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+65c2fb...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (1 GPs behind) idle=221/1/0x4000000000000002 softirq=15725/15726 fqs=5242
(detected by 1, t=10502 jiffies, g=19117, q=1411)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6930 Comm: syz.4.704 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:memset+0x0/0x40 mm/kasan/shadow.c:43
Code: f7 07 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 31 d2 e9 43 ef ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 30 ef ff ff <55> 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01
RSP: 0018:ffffc90000007638 EFLAGS: 00000046
RAX: ffffc900000076c0 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007800
RBP: ffffc900000078c8 R08: ffffc900000077bf R09: ffffc900000076c0
R10: dffffc0000000000 R11: fffff52000000ef8 R12: ffffe8ffffc703c8
R13: ffffc90000007800 R14: ffffe8ffffccc000 R15: ffffc900000076c0
FS: 00007f8a796d86c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30bff0 CR3: 00000000523e8000 CR4: 00000000003506f0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
perf_tp_event+0x11f/0xbe0 kernel/events/core.c:10044
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031
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:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 f2 0f 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007b00 EFLAGS: 00000206
RAX: c963d878d57ae700 RBX: 1ffff92000000f64 RCX: c963d878d57ae700
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4540
RBP: ffffc90000007bd8 R08: ffffffff901ef0cf R09: 1ffffffff203de19
R10: dffffc0000000000 R11: fffffbfff203de1a R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831
mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__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
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_get_return_address+0x63/0x80 arch/x86/kernel/unwind_orc.c:324
Code: 48 89 df e8 0f 20 89 00 48 8b 3b e8 77 a0 1a 00 85 c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 f4 1f 89 00 48 8b 03 eb 02 31 c0 <5b> 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c ad 48 89 df e8
RSP: 0018:ffffc9000331f308 EFLAGS: 00000246
RAX: ffffffff814757bf RBX: ffffc9000331f370 RCX: 0000000080000001
RDX: ffffc9000331f301 RSI: ffffc9000331fc90 RDI: ffffffff814757bf
RBP: ffffc9000331f3b0 R08: ffffc9000331fc90 R09: ffffc9000331f378
R10: dffffc0000000000 R11: fffff52000663e71 R12: ffff88802bf0bb80
R13: ffff888053c55480 R14: dffffc0000000000 R15: 1ffff92000663e6e
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kmem_cache_free+0x8f/0x210 mm/slub.c:3520
sk_prot_free net/core/sock.c:1902 [inline]
__sk_destruct+0x571/0x840 net/core/sock.c:1990
inet_release+0x139/0x180 net/ipv4/af_inet.c:432
__sock_release net/socket.c:651 [inline]
sock_release+0x7b/0x140 net/socket.c:679
inet_ctl_sock_destroy include/net/inet_common.h:65 [inline]
icmp_sk_exit+0x12b/0x220 net/ipv4/icmp.c:1485
ops_exit_list net/core/net_namespace.c:172 [inline]
setup_net+0x7cd/0xa10 net/core/net_namespace.c:365
copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:503
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
copy_namespaces+0x378/0x3d0 kernel/nsproxy.c:178
copy_process+0x17f0/0x3e70 kernel/fork.c:2295
kernel_clone+0x23f/0x990 kernel/fork.c:2682
__do_sys_clone kernel/fork.c:2799 [inline]
__se_sys_clone kernel/fork.c:2783 [inline]
__x64_sys_clone+0x19a/0x210 kernel/fork.c:2783
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: 0033:0x7f8a7b480159
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:00007f8a796d7fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8a7b707fa0 RCX: 00007f8a7b480159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040100000
RBP: 00007f8a7b51703b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f8a7b708038 R14: 00007f8a7b707fa0 R15: 00007fff32be2668
</TASK>


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