rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P21597/1:b..l P21608/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=120697, q=1418 ncpus=2)
task:syz.2.4076 state:R running task stack:26808 pid:21608 tgid:21605 ppid:17894 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7183
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7364
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1959 [inline]
zap_pmd_range mm/memory.c:2021 [inline]
zap_pud_range mm/memory.c:2049 [inline]
zap_p4d_range mm/memory.c:2070 [inline]
unmap_page_range+0x3b71/0x48f0 mm/memory.c:2091
unmap_single_vma mm/memory.c:2133 [inline]
unmap_vmas+0x48f/0x6a0 mm/memory.c:2171
exit_mmap+0x280/0x9e0 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1177
exit_mm+0x18e/0x250 kernel/exit.c:581
do_exit+0x6a2/0x23c0 kernel/exit.c:965
do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
get_signal+0x1284/0x1330 kernel/signal.c:3039
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb3119c819
RSP: 002b:00007fcb3207f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fcb31415fa8 RCX: 00007fcb3119c819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcb31415fa8
RBP: 00007fcb31415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb31416038 R14: 00007fff7e448860 R15: 00007fff7e448948
task:syz.5.4073 state:R running task stack:25560 pid:21597 tgid:21597 ppid:12901 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7183
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7364
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457
spin_unlock_bh include/linux/spinlock.h:396 [inline]
nl80211_netlink_notify+0x6f4/0x840 net/wireless/nl80211.c:22527
notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380
netlink_release+0x123b/0x1ad0 net/netlink/af_netlink.c:761
__sock_release net/socket.c:722 [inline]
sock_close+0xc3/0x240 net/socket.c:1514
__fput+0x44f/0xa60 fs/file_table.c:510
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7529d9c819
RSP: 002b:00007ffc7caaff98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f752a017da0 RCX: 00007f7529d9c819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f752a017da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f752a017cb0 R11: 0000000000000246 R12: 0000000000090e68
R13: 00007f752a01618c R14: 0000000000090ed3 R15: 00007f752a016180
rcu: rcu_preempt kthread starved for 10285 jiffies! g120697 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27968 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7183
__schedule_loop kernel/sched/core.c:7262 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7277
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 1301 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:kasan_poison_last_granule mm/kasan/shadow.c:156 [inline]
RIP: 0010:kasan_unpoison+0x48/0x70 mm/kasan/shadow.c:182
Code: df 48 c1 ef 03 49 bf 00 00 00 00 00 fc ff df 4c 01 ff 48 8d 14 03 48 ff c2 48 c1 ea 03 48 29 fa 4c 01 fa 31 f6 e8 88 fa 81 09 <4c> 89 f0 48 83 e0 07 74 0b 4c 01 f3 48 c1 eb 03 42 88 04 3b 5b 41
RSP: 0018:ffffc90000a07f50 EFLAGS: 00000246
RAX: ffffed1011c13b80 RBX: ffff88808e09dc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed1011c13b97
RBP: 0000000000000820 R08: ffffffff82251d7a R09: 0000000000000000
R10: ffffed1011c13b80 R11: ffffed1011c13ba1 R12: ffffffff897a6d46
R13: ffff88808e09dc00 R14: 00000000000000b8 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125345000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe02e4135d CR3: 000000007d3ae000 CR4: 00000000003526f0
Call Trace:
unpoison_slab_object mm/kasan/common.c:336 [inline]
__kasan_slab_alloc+0x58/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4538 [inline]
slab_alloc_node mm/slub.c:4866 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4873
skb_ext_maybe_cow net/core/skbuff.c:7063 [inline]
skb_ext_add+0x1b6/0x8f0 net/core/skbuff.c:7138
nf_bridge_unshare net/bridge/br_netfilter_hooks.c:170 [inline]
br_nf_forward_ip+0xc3/0xa30 net/bridge/br_netfilter_hooks.c:682
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:316
__br_forward+0x397/0x540 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver net/bridge/br_forward.c:191 [inline]
br_flood+0x6ee/0xb80 net/bridge/br_forward.c:238
br_handle_frame_finish+0x1521/0x1c80 net/bridge/br_input.c:229
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x91f/0xc30 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:183
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core+0x98f/0x3170 net/core/dev.c:6096
__netif_receive_skb_one_core net/core/dev.c:6207 [inline]
__netif_receive_skb net/core/dev.c:6322 [inline]
process_backlog+0x76d/0x1950 net/core/dev.c:6673
__napi_poll+0xae/0x340 net/core/dev.c:7737
napi_poll net/core/dev.c:7800 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7957
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__schedule+0x17bc/0x5680 kernel/sched/core.c:7143
Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 ba 35 7d f6 4c 89 23 4c 89 ef 4c 89 e6 e8 2c 5c 7f f5 48 89 c7 e8 d4 cf e0 f5 <31> ff 4d 39 e5 40 0f 95 c7 e8 b6 db e0 f5 48 8b 84 24 00 01 00 00
RSP: 0018:ffffc90005caf720 EFLAGS: 00000206
RAX: 0000000000177f1b RBX: ffff8880b873ae88 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dfb649f RDI: ffffffff8c27f000
RBP: ffffc90005caf940 R08: ffffffff903215b7 R09: 1ffffffff20642b6
R10: dffffc0000000000 R11: fffffbfff20642b7 R12: ffff888028de3d80
R13: ffff888028de3d80 R14: dffffc0000000000 R15: ffff8880b873b9f8
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7364
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:912 [inline]
__dev_queue_xmit+0x1fe5/0x3950 net/core/dev.c:4905
dev_queue_xmit include/linux/netdevice.h:3401 [inline]
tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62
kthread+0x1e0/0x3f0 drivers/block/aoe/aoecmd.c:1241
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245