[v6.1] INFO: rcu detected stall in sock_write_iter (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: dcbcab9d7079 Linux 6.1.174
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12f68a2e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0605c5af04d7603
dashboard link: https://syzkaller.appspot.com/bug?extid=404e8ee8fef0d60fa417
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/875b85cc4d29/disk-dcbcab9d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1d8bb5e74691/vmlinux-dcbcab9d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d919271a601/bzImage-dcbcab9d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+404e8e...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2678 jiffies s: 21361 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8462 Comm: syz.0.956 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:kasan_check_range+0x1af/0x290 mm/kasan/generic.c:-1
Code: 29 f3 4d 01 f3 49 89 df 49 8d 5f 07 4d 85 ff 49 0f 49 df 48 83 e3 f8 49 29 df 74 0e 41 80 3b 00 75 69 49 ff c3 49 ff cf 75 f2 <5b> 41 5c 41 5e 41 5f 5d c3 45 84 ff 0f 85 91 00 00 00 41 f7 c7 00
RSP: 0018:ffffc90000007630 EFLAGS: 00000056
RAX: 0000000000000101 RBX: 0000000000000000 RCX: ffffffff816d4eba
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88802c1c8000
RBP: ffffc90000007760 R08: ffff88802c1c8007 R09: 1ffff11005839000
R10: dffffc0000000000 R11: ffffed1005839001 R12: dffffc0000000001
R13: 0000000000000000 R14: 1ffff11005839000 R15: 0000000000000001
FS: 00007fc3b32096c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6df1d45690 CR3: 0000000064194000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
instrument_atomic_write include/linux/instrumented.h:87 [inline]
set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
set_ti_thread_flag include/linux/thread_info.h:89 [inline]
set_tsk_thread_flag include/linux/sched.h:2022 [inline]
set_tsk_need_resched include/linux/sched.h:2053 [inline]
rcu_read_unlock_special+0x26a/0x510 kernel/rcu/tree_plugin.h:664
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
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 82 22 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007ac0 EFLAGS: 00000206
RAX: d8026b82caf6a400 RBX: 1ffff92000000f60 RCX: d8026b82caf6a400
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1ba0
RBP: ffffc90000007bb0 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
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
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:zone_to_nid include/linux/mmzone.h:1323 [inline]
RIP: 0010:zone_statistics+0x61/0x170 mm/page_alloc.c:3733
Code: 84 c0 0f 85 d7 00 00 00 45 8b 2c 24 65 8b 05 16 1c 3b 7e 31 ed 41 39 c5 0f 94 c3 4d 8d 67 58 4c 89 e0 48 c1 e8 03 0f b6 04 10 <84> c0 0f 85 d1 00 00 00 40 88 dd 41 8b 1c 24 49 83 c6 70 4d 89 f4
RSP: 0018:ffffc900032d75d0 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff88813fffa701 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffff88813fffa700 RDI: ffff88813fffae00
RBP: 0000000000000000 R08: ffff8880b8e41343 R09: 1ffff110171c8268
R10: dffffc0000000000 R11: ffffed10171c8269 R12: ffff88813fffae58
R13: 0000000000000000 R14: ffff88813fffa700 R15: ffff88813fffae00
rmqueue_pcplist mm/page_alloc.c:3861 [inline]
rmqueue mm/page_alloc.c:3899 [inline]
get_page_from_freelist+0x851/0x1ab0 mm/page_alloc.c:4354
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
vm_area_alloc_pages mm/vmalloc.c:3002 [inline]
__vmalloc_area_node mm/vmalloc.c:3071 [inline]
__vmalloc_node_range+0x944/0x13b0 mm/vmalloc.c:3243
__vmalloc_node mm/vmalloc.c:3308 [inline]
vmalloc+0x75/0x80 mm/vmalloc.c:3341
netlink_alloc_large_skb net/netlink/af_netlink.c:1187 [inline]
netlink_sendmsg+0x5ec/0xbd0 net/netlink/af_netlink.c:1847
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
sock_write_iter+0x2d9/0x3e0 net/socket.c:1143
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x4b1/0xa30 fs/read_write.c:584
ksys_write+0x14c/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc3b239ce59
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:00007fc3b3209028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc3b2615fa0 RCX: 00007fc3b239ce59
RDX: 000000000000fe33 RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007fc3b2432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc3b2616038 R14: 00007fc3b2615fa0 R15: 00007ffde039fac8
</TASK>


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