rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=08bc/1/0x4000000000000000 softirq=35382/35383 fqs=2
rcu: (detected by 1, t=10505 jiffies, g=26781, q=481 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5841 Comm: syz-executor Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:qdisc_dev include/net/sch_generic.h:574 [inline]
RIP: 0010:advance_sched+0x5e/0xc90 net/sched/sch_taprio.c:916
Code: 80 3c 30 00 74 08 48 89 df e8 7e b5 9f f8 4c 8b 2b 49 8d 5d 40 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 58 b5 9f f8 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9
RSP: 0018:ffffc90000007c70 EFLAGS: 00000046
RAX: 1ffff1100b4d7608 RBX: ffff88805a6bb040 RCX: dffffc0000000000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff88805a6bb340
RBP: ffffc90000007e90 R08: ffffffff8fa0b1b7 R09: 1ffffffff1f41636
R10: dffffc0000000000 R11: ffffffff898362d0 R12: ffff88805a6bb340
R13: ffff88805a6bb000 R14: dffffc0000000000 R15: ffff888026f046d8
FS: 000055558ec29500(0000) GS:ffff888125c66000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff08ededc8 CR3: 0000000059acc000 CR4: 0000000000350ef0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:uncharge_folio+0x1ae/0x6b0 mm/memcontrol.c:4746
Code: 4c 89 ef e8 34 05 00 00 ba 28 00 00 00 4c 89 ef 31 f6 e8 35 c5 f7 ff 43 80 3c 27 00 74 08 4c 89 ef e8 46 c3 f7 ff 48 8b 04 24 <49> 89 45 00 48 8b 44 24 20 42 80 3c 20 00 74 08 48 89 df e8 3a c2
RSP: 0018:ffffc90003e6f438 EFLAGS: 00000246
RAX: ffff88804f1ce000 RBX: ffffea00015167c0 RCX: dffffc0000000000
RDX: ffff88804f1ce000 RSI: 0000000000000008 RDI: ffffea00015167c0
RBP: ffffea00015167c8 R08: ffffea00015167c7 R09: 1ffffd40002a2cf8
R10: dffffc0000000000 R11: fffff940002a2cf9 R12: dffffc0000000000
R13: ffffc90003e6f4e0 R14: 1ffffd40002a2cf9 R15: 1ffff920007cde9c
__mem_cgroup_uncharge_folios+0xf0/0x1c0 mm/memcontrol.c:4794
mem_cgroup_uncharge_folios include/linux/memcontrol.h:670 [inline]
folios_put_refs+0x551/0x640 mm/swap.c:991
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1125
shmem_truncate_range mm/shmem.c:1237 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365
evict+0x504/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:473
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f085ad8d5ca
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007ffc30f88e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f085ad8d5ca
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffc30f88e8c R08: 0000000000000000 R09: 00007ffc30f88b97
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000000bc
R13: 00000000000927c0 R14: 0000000000036d33 R15: 00007ffc30f88ee0
rcu: rcu_preempt kthread starved for 10495 jiffies! g26781 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:27128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6781
__schedule_loop kernel/sched/core.c:6859 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6874
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 5831 Comm: syz-executor Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 b0 77 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 5b 73 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 40 73 0b
RSP: 0018:ffffc900030675a0 EFLAGS: 00000293
RAX: ffffffff81b487b0 RBX: ffff8880b873cc00 RCX: ffff888065b41e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003067700 R08: ffffffff8fa0b1b7 R09: 1ffffffff1f41636
R10: dffffc0000000000 R11: fffffbfff1f41637 R12: 1ffff110170c8681
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8643408
FS: 0000555572b00500(0000) GS:ffff888125d66000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006680 CR3: 000000005bb0f000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451
dup_mmap kernel/fork.c:766 [inline]
dup_mm kernel/fork.c:1737 [inline]
copy_mm+0x18e2/0x2160 kernel/fork.c:1789
copy_process+0x1706/0x3c00 kernel/fork.c:2429
kernel_clone+0x21e/0x870 kernel/fork.c:2859
__do_sys_clone kernel/fork.c:3002 [inline]
__se_sys_clone kernel/fork.c:2986 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2986
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8357f851d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffca48f8c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8357f851d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555572b007d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000003739c R15: 00007ffca48f8de0