rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=21f4/1/0x4000000000000000 softirq=20931/20932 fqs=2
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5599/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=18929, q=408 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6677 Comm: syz.3.213 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:lock_acquire+0x79/0x380 kernel/locking/lockdep.c:5947
Code: 00 8b 35 7e 28 5e 10 85 f6 0f 85 c7 00 00 00 48 8b 44 24 30 65 48 2b 05 6d 2e a6 13 0f 85 09 03 00 00 48 83 c4 38 5b 5d 41 5c <41> 5d 41 5e 41 5f c3 cc cc cc cc 65 8b 05 7d 2e a6 13 83 f8 07 0f
RSP: 0018:ffffc90000007db8 EFLAGS: 00000096
RAX: 0000000000000000 RBX: ffff888039233300 RCX: 0000000000000200
RDX: 0000000001000000 RSI: ffffffff8e3bd310 RDI: ffffffff8c625580
RBP: ffff888036d0f400 R08: 00000000ef9d33e4 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3b3b1d56c0(0000) GS:ffff888122946000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000011000 CR3: 0000000078717000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 advance_sched+0x718/0xd20 net/sched/sch_taprio.c:993
 __run_hrtimer kernel/time/hrtimer.c:2074 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2131
 hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2250
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:ma_data_end lib/maple_tree.c:1307 [inline]
RIP: 0010:mtree_range_walk+0x161/0xb70 lib/maple_tree.c:2097
Code: 8b 44 24 10 48 8b 54 24 18 0f b6 98 60 ec 72 8d 8d 43 ff 88 44 24 08 0f b6 c0 48 8d 2c c2 48 89 e8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 4c 08 00 00 48 8b 6d 00 31 ff 48 89 ee e8 9b fe 40 f6 48 85
RSP: 0018:ffffc9000491f678 EFLAGS: 00000246
RAX: 1ffff11003d5c78f RBX: 000000000000000f RCX: ffffc9000f329000
RDX: ffff88801eae3c08 RSI: ffffffff8bcb41e0 RDI: ffffffff8d72ec61
RBP: ffff88801eae3c78 R08: 0000000000000005 R09: 0000000000000004
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888023bc0c80
R13: dffffc0000000000 R14: 0000000000000001 R15: 00007f3b3b194fff
 mas_state_walk lib/maple_tree.c:3013 [inline]
 mt_find+0x1c6/0x9b0 lib/maple_tree.c:6433
 find_vma+0xbf/0x140 mm/mmap.c:923
 lock_mm_and_find_vma+0x62/0x6f0 mm/mmap_lock.c:504
 do_user_addr_fault+0x293/0x12f0 arch/x86/mm/fault.c:1366
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0010:rep_movs_alternative+0x30/0xa0 arch/x86/lib/copy_user_64.S:60
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc9000491fa50 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000200000011000 RCX: 0000000000000038
RDX: 0000000000000001 RSI: 0000200000011000 RDI: ffffc9000491faa8
RBP: 0000000000000038 R08: 0000000000000001 R09: fffff52000923f5b
R10: ffffc9000491fadf R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000491faa8 R14: 0000200000011000 R15: dffffc0000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
 _inline_copy_from_user include/linux/uaccess.h:185 [inline]
 _copy_from_user+0x98/0xd0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:222 [inline]
 copy_msghdr_from_user+0x9f/0x4c0 net/socket.c:2643
 recvmsg_copy_msghdr net/socket.c:2899 [inline]
 ___sys_recvmsg+0xdd/0x1a0 net/socket.c:2971
 do_recvmmsg+0x2f3/0x740 net/socket.c:3070
 __sys_recvmmsg net/socket.c:3144 [inline]
 __do_sys_recvmmsg net/socket.c:3167 [inline]
 __se_sys_recvmmsg net/socket.c:3160 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3160
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b3cf9e1d9
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:00007f3b3b1d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f3b3d226090 RCX: 00007f3b3cf9e1d9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f3b3d035888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b3d226128 R14: 00007f3b3d226090 R15: 00007ffc65e8d338
 </TASK>
task:syz-executor    state:R  running task     stack:22944 pid:5599  tgid:5599  ppid:5592   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__nr_to_section+0x98/0x100 include/linux/mmzone.h:2067
Code: 48 85 ed 74 54 e8 78 7c 7f ff 4a 8d 6c e5 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 57 48 8b 6d 00 <48> 85 ed 74 2a e8 4e 7c 7f ff 83 e3 7f e8 46 7c 7f ff 48 c1 e3 05
RSP: 0018:ffffc90003cdf500 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 000000000000000a RCX: 0000000000000000
RDX: 1ffff11047ffc600 RSI: ffffffff828cc9d8 RDI: ffff888035442580
RBP: ffff88813fe23000 R08: 0000000000000006 R09: 0000000000001000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000001401e5 R14: 0000000000000001 R15: 00000000032602df
 __pfn_to_section include/linux/mmzone.h:2193 [inline]
 lookup_page_ext+0x46/0x100 mm/page_ext.c:250
 page_ext_iter_begin include/linux/page_ext.h:136 [inline]
 __update_page_owner_free_handle.isra.0+0xe6/0x4b0 mm/page_owner.c:302
 __reset_page_owner+0x93/0x190 mm/page_owner.c:339
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_unref_folios+0xa4a/0x1790 mm/page_alloc.c:3022
 folios_put_refs+0x585/0xaa0 mm/folio.c:1036
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1161
 shmem_truncate_range mm/shmem.c:1289 [inline]
 shmem_evict_inode+0x3b1/0xca0 mm/shmem.c:1420
 evict+0x3c2/0xad0 fs/inode.c:822
 iput_final fs/inode.c:2014 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2063
 iput+0x35/0x40 fs/inode.c:2029
 filename_unlinkat+0x466/0x730 fs/namei.c:5752
 __do_sys_unlink fs/namei.c:5783 [inline]
 __se_sys_unlink fs/namei.c:5780 [inline]
 __x64_sys_unlink+0x46/0x70 fs/namei.c:5780
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9a56f9d2c7
RSP: 002b:00007ffd95843d28 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9a56f9d2c7
RDX: 00007ffd95843d50 RSI: 00007ffd95843de0 RDI: 00007ffd95843de0
RBP: 00007ffd95843de0 R08: 00007ffd95844de0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd95844e70
R13: 00007f9a57034ccb R14: 00000000000235ab R15: 00007ffd95844eb0
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g18929 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27560 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 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: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: a7 96 02 e9 53 50 03 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 53 48 17 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 00000242
RAX: 00000000002ac1a1 RBX: ffff8880206c4b00 RCX: ffffffff8bd47235
RDX: 0000000000000001 RSI: ffffffff8e3e34cb RDI: ffffffff8c625580
RBP: ffffed10040d8960 R08: 0000000000000001 R09: ffffed10170667bd
R10: ffff8880b8333deb R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff92000034fc4 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888122a46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c27613d CR3: 0000000078717000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
 default_idle+0x9/0x10 arch/x86/kernel/process.c:768
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x3ae/0x5b0 kernel/sched/idle.c:355
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x158
 </TASK>