rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=25621, q=967 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294966560-4294956058), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g25621 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5192 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2029 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2231 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 7896 Comm: syz-executor.1 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:50 [inline] RIP: 0010:unwind_get_return_address+0x1c/0xc0 arch/x86/kernel/unwind_orc.c:366 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 a4 69 52 00 <48> 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 72 8b 2b 31 ff 89 ee RSP: 0018:ffffc90000006c18 EFLAGS: 00000246 RAX: ffffffff8140de4c RBX: ffffc90000006c40 RCX: ffff888023411e00 RDX: 0000000080000102 RSI: 0000000080000102 RDI: ffffc90000006c40 RBP: ffffc90000006cd0 R08: ffffffff8140fe65 R09: ffffffff8140f95f R10: 0000000000000003 R11: ffff888023411e00 R12: ffff888023411e00 R13: ffffffff817ef6f0 R14: dffffc0000000000 R15: ffffc90000006c40 FS: 00007f98506916c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9850690f00 CR3: 000000002a2de000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x125/0x1b0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4140 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4153 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] cfg80211_inform_single_bss_data+0xd78/0x2360 net/wireless/scan.c:2265 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3117 cfg80211_inform_bss_frame_data+0x3bc/0x720 net/wireless/scan.c:3207 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226 ieee80211_scan_rx+0x526/0x9c0 net/mac80211/scan.c:340 __ieee80211_rx_handle_packet net/mac80211/rx.c:5222 [inline] ieee80211_rx_list+0x2b00/0x3780 net/mac80211/rx.c:5459 ieee80211_rx_napi+0x18a/0x3c0 net/mac80211/rx.c:5482 ieee80211_rx include/net/mac80211.h:5132 [inline] ieee80211_handle_queued_frames+0xe7/0x1e0 net/mac80211/main.c:438 tasklet_action_common+0x321/0x4d0 kernel/softirq.c:785 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 4e d0 63 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 c3 eb cc f5 65 8b 05 74 4f 6e 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000940f580 EFLAGS: 00000206 RAX: 8ceb6873b16a7f00 RBX: 1ffff92001281eb4 RCX: ffffffff947c3803 RDX: dffffc0000000000 RSI: ffffffff8bcac1a0 RDI: 0000000000000001 RBP: ffffc9000940f610 R08: ffffffff8fae04af R09: 1ffffffff1f5c095 R10: dffffc0000000000 R11: fffffbfff1f5c096 R12: dffffc0000000000 R13: 1ffff92001281eb0 R14: ffffc9000940f5a0 R15: 0000000000000246 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0x5c1/0x1470 kernel/sched/core.c:4055 wake_up_process kernel/sched/core.c:4303 [inline] wake_up_q+0xc8/0x120 kernel/sched/core.c:1030 __mutex_unlock_slowpath+0x6f9/0x750 kernel/locking/mutex.c:956 pipe_read+0xb46/0x13e0 fs/pipe.c:361 do_iter_readv_writev+0x5a4/0x800 vfs_readv+0x2b6/0xa90 fs/read_write.c:932 do_readv+0x1b1/0x350 fs/read_write.c:994 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f984f87cea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f98506910c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007f984f9b4120 RCX: 00007f984f87cea9 RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007f984f8ebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f984f9b4120 R15: 00007ffcb00864b8