rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=045c/1/0x4000000000000000 softirq=41106/41106 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=51649, q=1551 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12650 Comm: syz.1.2420 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x7c/0x290 mm/kasan/generic.c:187
Code: 4d 89 c1 49 c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 <4c> 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 8d 01 00 00 49 ff c3
RSP: 0018:ffffc900036568c8 EFLAGS: 00000002
RAX: dffffc0000000001 RBX: dffffc0000000001 RCX: ffffffff84297cda
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90003656940
RBP: ffffc900036569c0 R08: ffffc90003656947 R09: 1ffff920006cad28
R10: dffffc0000000000 R11: fffff520006cad28 R12: 0000000000000001
R13: 1ffff920006cad24 R14: fffff520006cad29 R15: 1ffff920006cad28
FS:  00007f55e280a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 000000005deca000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 instrument_read_write include/linux/instrumented.h:54 [inline]
 llist_add_batch+0xda/0x1f0 lib/llist.c:33
 llist_add include/linux/llist.h:221 [inline]
 __irq_work_queue_local+0xaf/0x3b0 kernel/irq_work.c:107
 irq_work_queue+0x99/0x140 kernel/irq_work.c:124
 __perf_event_overflow+0x4f1/0x630 kernel/events/core.c:9724
 perf_swevent_overflow kernel/events/core.c:9803 [inline]
 perf_swevent_event+0x319/0x570 kernel/events/core.c:9854
 perf_tp_event+0x5f9/0x1520 kernel/events/core.c:10381
 perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10300
 perf_trace_preemptirq_template+0x269/0x330 include/trace/events/preemptirq.h:14
 trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 e0 94 34 09 e8 1b 2f 30 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:ffffc90003657038 EFLAGS: 00000282
RAX: 643f9e345144a800 RBX: 0000000000000000 RCX: 643f9e345144a800
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc90003657090 R08: ffffffff911cd537 R09: 1ffffffff2239aa6
R10: dffffc0000000000 R11: fffffbfff2239aa7 R12: ffff888065955a00
R13: dffffc0000000000 R14: ffff888065951e00 R15: ffff8880b8e3cb48
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 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:__pte_offset_map_lock+0x3f/0x1d0 mm/pgtable-generic.c:371
Code: 49 89 d7 49 89 f4 65 48 8b 04 25 28 00 00 00 48 89 44 24 38 e8 02 5f b7 ff 48 c7 44 24 30 00 00 00 00 48 8d 54 24 30 4c 89 e7 <4c> 89 fe e8 29 fb ff ff 48 85 c0 0f 84 6b 01 00 00 48 89 5c 24 18
RSP: 0018:ffffc90003657428 EFLAGS: 00000246
RAX: ffffffff81cfcc8e RBX: ffffc900036575e0 RCX: 0000000000080000
RDX: ffffc90003657458 RSI: 000000000007ffff RDI: ffff88804ed57010
RBP: ffffc90003657668 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: ffff88804ed57010
R13: 0000000000000000 R14: dffffc0000000000 R15: 000020000053a000
 pte_offset_map_lock include/linux/mm.h:3016 [inline]
 do_anonymous_page mm/memory.c:4128 [inline]
 do_pte_missing mm/memory.c:3687 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5188 [inline]
 handle_mm_fault+0x216f/0x4c00 mm/memory.c:5353
 do_user_addr_fault+0x730/0x12c0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01
RSP: 0018:ffffc90003657818 EFLAGS: 00050206
RAX: ffffffff84284301 RBX: 0000000000008000 RCX: 0000000000006140
RDX: 0000000000000001 RSI: 000020000053a000 RDI: ffff8880311e9ec0
RBP: ffffc90003657970 R08: ffff8880311effff R09: 1ffff1100623dfff
R10: dffffc0000000000 R11: ffffed100623e000 R12: ffff8880311e8000
R13: 0000200000538140 R14: ffffc90003657c18 R15: 1ffff920006caf83
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline]
 copyin lib/iov_iter.c:193 [inline]
 _copy_from_iter+0x24e/0x12e0 lib/iov_iter.c:390
 copy_from_iter include/linux/uio.h:209 [inline]
 copy_from_iter_full include/linux/uio.h:216 [inline]
 skb_do_copy_data_nocache include/net/sock.h:2342 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2368 [inline]
 kcm_sendmsg+0xd95/0x28b0 net/kcm/kcmsock.c:858
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x2df/0x420 net/socket.c:1160
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x46c/0x990 fs/read_write.c:584
 ksys_write+0x150/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f55e199ce59
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:00007f55e280a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f55e1c15fa0 RCX: 00007f55e199ce59
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000007
RBP: 00007f55e1a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55e1c16038 R14: 00007f55e1c15fa0 R15: 00007ffeb8fa3c48
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g51649 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=24728
rcu: rcu_preempt kthread starved for 10502 jiffies! g51649 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26952 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12650 Comm: syz.1.2420 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:perf_trace_buf_alloc+0x1b1/0x290 kernel/trace/trace_event_perf.c:416
Code: 00 89 c6 e8 11 cd f7 ff 83 fd 07 0f 87 a9 00 00 00 e8 53 c9 f7 ff 4e 8d 3c fd 30 da a7 8c 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 ff e8 55 09 50 00 4d 03 37 48 63 c3 4a 8d 7c 30 f8 ba
RSP: 0018:ffffc90003656e40 EFLAGS: 00000046
RAX: 1ffffffff194fb46 RBX: 0000000000000014 RCX: ffff888065955a00
RDX: 0000000040000002 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: ffffffff8ca7da30
R13: dffffc0000000000 R14: 0000607f46e9c000 R15: ffffffff8ca7da30
FS:  00007f55e280a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 000000005deca000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 perf_trace_preemptirq_template+0x144/0x330 include/trace/events/preemptirq.h:14
 trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 e0 94 34 09 e8 1b 2f 30 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:ffffc90003657038 EFLAGS: 00000282
RAX: 643f9e345144a800 RBX: 0000000000000000 RCX: 643f9e345144a800
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc90003657090 R08: ffffffff911cd537 R09: 1ffffffff2239aa6
R10: dffffc0000000000 R11: fffffbfff2239aa7 R12: ffff888065955a00
R13: dffffc0000000000 R14: ffff888065951e00 R15: ffff8880b8e3cb48
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 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:__pte_offset_map_lock+0x3f/0x1d0 mm/pgtable-generic.c:371
Code: 49 89 d7 49 89 f4 65 48 8b 04 25 28 00 00 00 48 89 44 24 38 e8 02 5f b7 ff 48 c7 44 24 30 00 00 00 00 48 8d 54 24 30 4c 89 e7 <4c> 89 fe e8 29 fb ff ff 48 85 c0 0f 84 6b 01 00 00 48 89 5c 24 18
RSP: 0018:ffffc90003657428 EFLAGS: 00000246
RAX: ffffffff81cfcc8e RBX: ffffc900036575e0 RCX: 0000000000080000
RDX: ffffc90003657458 RSI: 000000000007ffff RDI: ffff88804ed57010
RBP: ffffc90003657668 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: ffff88804ed57010
R13: 0000000000000000 R14: dffffc0000000000 R15: 000020000053a000
 pte_offset_map_lock include/linux/mm.h:3016 [inline]
 do_anonymous_page mm/memory.c:4128 [inline]
 do_pte_missing mm/memory.c:3687 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5188 [inline]
 handle_mm_fault+0x216f/0x4c00 mm/memory.c:5353
 do_user_addr_fault+0x730/0x12c0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01
RSP: 0018:ffffc90003657818 EFLAGS: 00050206
RAX: ffffffff84284301 RBX: 0000000000008000 RCX: 0000000000006140
RDX: 0000000000000001 RSI: 000020000053a000 RDI: ffff8880311e9ec0
RBP: ffffc90003657970 R08: ffff8880311effff R09: 1ffff1100623dfff
R10: dffffc0000000000 R11: ffffed100623e000 R12: ffff8880311e8000
R13: 0000200000538140 R14: ffffc90003657c18 R15: 1ffff920006caf83
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline]
 copyin lib/iov_iter.c:193 [inline]
 _copy_from_iter+0x24e/0x12e0 lib/iov_iter.c:390
 copy_from_iter include/linux/uio.h:209 [inline]
 copy_from_iter_full include/linux/uio.h:216 [inline]
 skb_do_copy_data_nocache include/net/sock.h:2342 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2368 [inline]
 kcm_sendmsg+0xd95/0x28b0 net/kcm/kcmsock.c:858
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x2df/0x420 net/socket.c:1160
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x46c/0x990 fs/read_write.c:584
 ksys_write+0x150/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f55e199ce59
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:00007f55e280a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f55e1c15fa0 RCX: 00007f55e199ce59
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000007
RBP: 00007f55e1a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55e1c16038 R14: 00007f55e1c15fa0 R15: 00007ffeb8fa3c48
 </TASK>