rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6551/1:b..l P1369/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=21017, q=592 ncpus=2)
task:kworker/u8:7    state:R  running task     stack:20256 pid:1369  tgid:1369  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:memset+0xf/0x20 arch/x86/lib/memset_64.S:38
Code: 44 88 1f e9 ee 69 60 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 e9 c2 69 60 f5 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000560f530 EFLAGS: 00000202
RAX: ffffc9000560fa00 RBX: ffffc9000560f640 RCX: 0000000000000007
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000560f661
RBP: dffffc0000000000 R08: ffffc9000560f667 R09: ffffc9000560f658
R10: dffffc0000000000 R11: fffff52000ac1ecd R12: ffffc9000560f658
R13: 1ffff92000ac1ec3 R14: ffffc9000560f608 R15: ffffc9000560f650
 unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2685 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x187/0x630 mm/slub.c:6295
 ieee80211_iface_work+0xb8e/0x1340 net/mac80211/iface.c:1804
 cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:440
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:udevd           state:R  running task     stack:24544 pid:6551  tgid:6551  ppid:5190   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 __wake_up_common_lock+0x190/0x1f0 kernel/sched/wait.c:127
 sock_def_readable+0x1eb/0x580 net/core/sock.c:3611
 unix_dgram_sendmsg+0xe1c/0x18e0 net/unix/af_unix.c:2283
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 sock_write_iter+0x49b/0x4f0 net/socket.c:1195
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66ef6a7407
RSP: 002b:00007fffa2b8c020 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f66efda5880 RCX: 00007f66ef6a7407
RDX: 0000000000000000 RSI: 00007fffa2b8c0c7 RDI: 000000000000000a
RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f66efda56e8
R13: 0000000000000000 R14: 0000000000000000 R15: 00005593d6ac3830
 </TASK>
rcu: rcu_preempt kthread starved for 10565 jiffies! g21017 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:27744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 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+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6731 Comm: vhost-6728 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
RIP: 0010:raw_atomic_long_read include/linux/atomic/atomic-long.h:38 [inline]
RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3189 [inline]
RIP: 0010:__rwsem_set_reader_owned kernel/locking/rwsem.c:175 [inline]
RIP: 0010:rwsem_set_reader_owned kernel/locking/rwsem.c:182 [inline]
RIP: 0010:__down_read_trylock kernel/locking/rwsem.c:1299 [inline]
RIP: 0010:down_read_trylock+0x166/0x380 kernel/locking/rwsem.c:1576
Code: 00 00 00 00 00 00 80 49 85 c7 75 7a eb b8 65 4c 8b 3d 76 9f 7b 11 4c 8d 73 08 4c 89 f7 be 08 00 00 00 e8 8d f0 8e 00 4d 89 f4 <49> c1 ec 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 04 00 74 08 4c
RSP: 0018:ffffc90003e3f7c0 EFLAGS: 00000256
RAX: 0000000000000001 RBX: ffff88805e7e4c50 RCX: ffffffff81a120a3
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88805e7e4c58
RBP: ffffc90003e3f878 R08: ffff88805e7e4c5f R09: 1ffff1100bcfc98b
R10: dffffc0000000000 R11: ffffed100bcfc98c R12: ffff88805e7e4c58
R13: 1ffff920007c7efc R14: ffff88805e7e4c58 R15: ffff888032f33d00
FS:  00007fe8144f26c0(0000) GS:ffff888125554000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000007c5e6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 mmap_read_trylock include/linux/mmap_lock.h:611 [inline]
 get_mmap_lock_carefully mm/mmap_lock.c:441 [inline]
 lock_mm_and_find_vma+0x36/0x340 mm/mmap_lock.c:501
 do_user_addr_fault+0x330/0x1340 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__get_user_2+0x14/0x30 arch/x86/lib/getuser.S:77
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 ba 00 f0 ff ff ff 7f 00 00 48 39 d0 48 0f 47 c2 0f 01 cb <0f> b7 10 31 c0 0f 01 ca e9 0a ea 61 f5 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003e3fa50 EFLAGS: 00050283
RAX: 0000000000000002 RBX: ffff8880512101e0 RCX: 0000000000000046
RDX: 00007ffffffff000 RSI: ffffffff8e16c434 RDI: ffffffff8c27d500
RBP: 0000000000000000 R08: ffffffff8216841f R09: ffff88805e7e4cc0
R10: dffffc0000000000 R11: fffffbfff2023ad7 R12: dffffc0000000000
R13: ffffc90003e3fc00 R14: ffff888051210290 R15: ffffc90003e3fa58
 vhost_get_avail_idx+0xe6/0x460 drivers/vhost/vhost.c:1527
 vhost_enable_notify+0x325/0x650 drivers/vhost/vhost.c:3240
 vhost_transport_do_send_pkt+0xfb1/0x13a0 drivers/vhost/vsock.c:128
 vhost_run_work_list+0x14d/0x1e0 drivers/vhost/vhost.c:454
 vhost_task_fn+0x2ef/0x4a0 kernel/vhost_task.c:49
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>