[v6.6] INFO: rcu detected stall in sock_alloc_file

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: bb9c90ab9c5a Linux 6.6.102
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16311c42580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7b989b97a0687b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=5a6092cba56b160f8439
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3741b512b75a/disk-bb9c90ab.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dedce7f4c998/vmlinux-bb9c90ab.xz
kernel image: https://storage.googleapis.com/syzbot-assets/acd529da0064/bzImage-bb9c90ab.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5a6092...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (1 GPs behind) idle=69c4/1/0x4000000000000000 softirq=21794/21795 fqs=5249
rcu: hardirqs softirqs csw/system
rcu: number: 11485374 0 0
rcu: cputime: 4995 47522 0 ==> 52500(ms)
rcu: (detected by 1, t=10502 jiffies, g=25885, q=1272 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8414 Comm: syz.4.938 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x27/0x80 kernel/kcov.c:320
Code: 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 2a 7e 7e 65 8b 15 91 2a 7e 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 <83> b9 1c 16 00 00 00 74 4e 8b 91 f8 15 00 00 83 fa 03 75 43 48 8b
RSP: 0018:ffffc90000007508 EFLAGS: 00000046
RAX: ffffffff81acc9ed RBX: 0000000000000102 RCX: ffff88805c810000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8e4a882f R09: 1ffffffff1c95105
R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffffffff8cd834f0
R13: dffffc0000000000 R14: ffff8880b8e00000 R15: dffffc0000000000
FS: 00007fabb3d5c6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c336840 CR3: 0000000064951000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
interrupt_context_level include/linux/preempt.h:95 [inline]
get_recursion_context kernel/events/internal.h:214 [inline]
perf_swevent_get_recursion_context+0x7d/0x150 kernel/events/core.c:9946
perf_trace_buf_alloc+0x59/0x290 kernel/trace/trace_event_perf.c:410
perf_trace_preemptirq_template+0x14a/0x340 include/trace/events/preemptirq.h:14
trace_irq_disable+0xbf/0xe0 include/trace/events/preemptirq.h:36
irqentry_enter+0x3b/0x50 kernel/entry/common.c:381
sysvec_irq_work+0xe/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007740 EFLAGS: 00000206
RAX: e965b5ea806a4600 RBX: 1ffff92000000ef0 RCX: e965b5ea806a4600
RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0
RBP: ffffc90000007840 R08: ffffffff90da352f R09: 1ffffffff21b46a5
R10: dffffc0000000000 R11: fffffbfff21b46a6 R12: ffffffff8cd35400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:818 [inline]
netif_receive_skb_list_internal+0x9ed/0xc60 net/core/dev.c:5831
gro_normal_list include/net/gro.h:448 [inline]
napi_complete_done+0x32a/0x810 net/core/dev.c:6170
virtqueue_napi_complete drivers/net/virtio_net.c:450 [inline]
virtnet_poll+0xa44/0x1180 drivers/net/virtio_net.c:2231
__napi_poll+0xc0/0x460 net/core/dev.c:6600
napi_poll net/core/dev.c:6667 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6803
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
common_interrupt+0xb9/0xd0 arch/x86/kernel/irq.c:249
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
RIP: 0010:finish_task_switch+0x26a/0x920 kernel/sched/core.c:5254
Code: 0f 84 37 01 00 00 48 85 db 0f 85 56 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 c0 a3 1a 09 e8 ab a2 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900036976b8 EFLAGS: 00000286
RAX: e965b5ea806a4600 RBX: 0000000000000000 RCX: e965b5ea806a4600
RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0
RBP: ffffc90003697710 R08: ffffffff90da352f R09: 1ffffffff21b46a5
R10: dffffc0000000000 R11: fffffbfff21b46a6 R12: ffff88805c810000
R13: dffffc0000000000 R14: ffff88805ec0da00 R15: ffff8880b8e3cf08
context_switch kernel/sched/core.c:5383 [inline]
__schedule+0x14da/0x44d0 kernel/sched/core.c:6699
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:PagePoisoned include/linux/page-flags.h:297 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1636 [inline]
RIP: 0010:folio_nid include/linux/mm.h:1642 [inline]
RIP: 0010:slab_nid mm/slab.h:208 [inline]
RIP: 0010:discard_slab+0x0/0x40 mm/slub.c:2121
Code: 48 02 84 c0 74 10 4d 89 77 08 4c 89 7b 10 4c 89 63 18 4d 89 34 24 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b eb 92 0f 1f 44 00 00 <48> 8b 06 48 83 f8 ff 74 25 48 c1 e8 3a 0f b7 4e 2a 81 e1 ff 7f 00
RSP: 0018:ffffc90003697a98 EFLAGS: 00000246
RAX: e965b5ea806a4600 RBX: ffffea0000c61900 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffea0000c61900 RDI: ffff888019a4cb40
RBP: ffff888019a4cb40 R08: ffffffff90da352f R09: 1ffffffff21b46a5
R10: dffffc0000000000 R11: fffffbfff21b46a6 R12: ffff888018258d80
R13: 0000000000100001 R14: 0000000000000a02 R15: ffff888018258d80
__slab_free+0x35e/0x410 mm/slub.c:3722
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
lsm_file_alloc security/security.c:612 [inline]
security_file_alloc+0x34/0x120 security/security.c:2603
init_file+0x94/0x1f0 fs/file_table.c:161
alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210
alloc_file+0x5c/0x600 fs/file_table.c:293
alloc_file_pseudo+0x17e/0x200 fs/file_table.c:336
sock_alloc_file+0xb7/0x280 net/socket.c:469
__sys_socketpair+0x2d0/0x550 net/socket.c:1802
__do_sys_socketpair net/socket.c:1831 [inline]
__se_sys_socketpair net/socket.c:1828 [inline]
__x64_sys_socketpair+0x9b/0xb0 net/socket.c:1828
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabb2f8ebe9
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:00007fabb3d5c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fabb31b5fa0 RCX: 00007fabb2f8ebe9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007fabb3011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000180 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabb31b6038 R14: 00007fabb31b5fa0 R15: 00007ffca588d708
</TASK>


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f89b6e15694c Linux 6.1.149
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1423ee62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=115cdcc5760d448b
dashboard link: https://syzkaller.appspot.com/bug?extid=99b99d08dbc06bf7d181

compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

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

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/d50897075012/disk-f89b6e15.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be1ee22a32ec/vmlinux-f89b6e15.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f434e015cacd/bzImage-f89b6e15.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+99b99d...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2676 jiffies s: 50513 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: 11514 Comm: syz.1.1724 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025

RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:244 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x80 kernel/kcov.c:320
Code: 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 48 8b 04 24 <65> 48 8b 0d 34 9b 81 7e 65 8b 15 35 9b 81 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000006e38 EFLAGS: 00000046
RAX: ffffffff81395a81 RBX: 00000000b8e3b970 RCX: ffff88801d6bd940
RDX: 0000000000000100 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff215c249
R10: fffffbfff215c249 R11: 1ffffffff215c248 R12: dffffc0000000000
R13: ffffea000000000f R14: ffffffff81395968 R15: ffff88813fff92e0
FS: 00007f8c18cc96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fb6773916c8 CR3: 00000000672ea000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>

pfn_valid include/linux/mmzone.h:1866 [inline]
__virt_addr_valid+0x2a1/0x540 arch/x86/mm/physaddr.c:65
kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:35
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471
irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140
rcu_read_unlock_special+0x3c7/0x500 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
__perf_event_output kernel/events/core.c:7741 [inline]
perf_event_output_forward+0x237/0x2a0 kernel/events/core.c:7750
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_tp_event+0x335/0xb60 kernel/events/core.c:10029
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
perf_trace_preemptirq_template+0x287/0x330 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+0x84/0x500 kernel/rcu/tree_plugin.h:685
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 5d 97 96 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000076a0 EFLAGS: 00000206
RAX: e81e3ba5b6c29200 RBX: 1ffff92000000edc RCX: e81e3ba5b6c29200
RDX: dffffc0000000000 RSI: ffffffff8a8c0300 RDI: ffffffff8adefae0
RBP: ffffc900000077a0 R08: dffffc0000000000 R09: fffffbfff215c26b
R10: fffffbfff215c26b R11: 1ffffffff215c26a 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]
ndisc_send_skb+0xda7/0x1510 net/ipv6/ndisc.c:521
ndisc_send_ns net/ipv6/ndisc.c:671 [inline]
ndisc_solicit+0x43b/0x600 net/ipv6/ndisc.c:-1
neigh_probe net/core/neighbour.c:1080 [inline]
neigh_timer_handler+0xaaa/0x1080 net/core/neighbour.c:1162
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 fe d1 65 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c6 5b 36 f7 65 8b 05 e7 14 e1 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000515f920 EFLAGS: 00000206
RAX: e81e3ba5b6c29200 RBX: 0000000000000a06 RCX: e81e3ba5b6c29200
RDX: dffffc0000000000 RSI: ffffffff8a8c0300 RDI: 0000000000000001
RBP: ffffc9000515f9a8 R08: dffffc0000000000 R09: ffffed10171c6af6
R10: ffffed10171c6af6 R11: 1ffff110171c6af5 R12: dffffc0000000000
R13: ffff888079398000 R14: ffffffff96e91700 R15: 1ffff92000a2bf24
__debug_check_no_obj_freed lib/debugobjects.c:988 [inline]
debug_check_no_obj_freed+0x515/0x530 lib/debugobjects.c:1009
free_pages_prepare mm/page_alloc.c:1465 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x2a6/0x9a0 mm/page_alloc.c:3384
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1a5/0x200 mm/slub.c:2586
put_cpu_partial+0x17c/0x250 mm/slub.c:2662
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x11a/0x2e0 mm/slub.c:3429
__d_alloc+0x31/0x700 fs/dcache.c:1774
d_alloc_pseudo+0x19/0x70 fs/dcache.c:1904
alloc_file_pseudo+0xc8/0x1f0 fs/file_table.c:265
sock_alloc_file+0xb3/0x240 net/socket.c:467
__sys_socketpair+0x2cc/0x540 net/socket.c:1757
__do_sys_socketpair net/socket.c:1786 [inline]
__se_sys_socketpair net/socket.c:1783 [inline]
__x64_sys_socketpair+0x97/0xb0 net/socket.c:1783
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8c17d8ebe9

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:00007f8c18cc9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f8c17fc5fa0 RCX: 00007f8c17d8ebe9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 00007f8c17e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000001c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c17fc6038 R14: 00007f8c17fc5fa0 R15: 00007ffd97b0c0a8