rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5601/1:b..l P11251/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=125061, q=842 ncpus=1)
task:syz.1.1541 state:R running task stack:27128 pid:11251 tgid:11251 ppid:5602 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7277
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7599
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:preempt_schedule_thunk+0x18/0x40 arch/x86/entry/thunk.S:12
Code: 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 7a 98 5b 0a 41 5b <41> 5a 41 59 41 58 58 59 5a 5e 5f 5d e9 87 99 5d 0a 0f 1f 80 00 00
RSP: 0018:ffffc900040b7a68 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff88803666a5c8 RCX: 1ffff92000816f35
RDX: 0000000000000000 RSI: ffffffff8c622e00 RDI: ffffffff8e657920
RBP: ffffc900040b7aa8 R08: 0000000000000000 R09: fffffbfff228a58b
R10: ffffffff91452c5f R11: 0000000000000000 R12: fffff52000816f6f
R13: ffffc900040b7b78 R14: 0000000000000000 R15: 0000000000000000
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
futex_unqueue+0x103/0x2c0 kernel/futex/core.c:917
__futex_wait+0x1cc/0x300 kernel/futex/waitwake.c:725
futex_wait+0xe6/0x370 kernel/futex/waitwake.c:750
do_futex+0x265/0x440 kernel/futex/syscalls.c:133
__do_sys_futex kernel/futex/syscalls.c:210 [inline]
__se_sys_futex kernel/futex/syscalls.c:191 [inline]
__x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:191
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: 0033:0x7efeab79e159
RSP: 002b:00007ffc33b3e868 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000000b25fe RCX: 00007efeab79e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efeaba25fac
RBP: 0000000000000bea R08: 0000000000000001 R09: 0000000000000000
R10: 00007ffc33b3e970 R11: 0000000000000246 R12: 00007ffc33b3e990
R13: 00007efeaba25fac R14: 00000000000b31e8 R15: 00007ffc33b3e970
task:syz-executor state:R running task stack:23208 pid:5601 tgid:5601 ppid:5596 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7277
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7599
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:unwind_next_frame+0x144b/0x2090 arch/x86/kernel/unwind_orc.c:532
Code: 12 00 0f 85 23 ef ff ff 4c 89 ef c6 05 fd fc d6 12 01 e8 e8 e8 ff ff e9 0f ef ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 <48> c1 ea 03 80 3c 02 00 0f 85 a6 08 00 00 48 89 c8 4d 8b 7d 38 48
RSP: 0018:ffffc90002fcf300 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff91f81a96
RDX: ffffc90002fcf3a8 RSI: 0000000000000001 RDI: ffffffff9168d428
RBP: ffffc90002fcf3b8 R08: ffffffff91f81a9a R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000018a49 R12: ffffc90002fcf3c0
R13: ffffc90002fcf370 R14: 0000000000000003 R15: 0000000000000000
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:183
__reset_page_owner+0x84/0x190 mm/page_owner.c:338
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:2015 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2064
iput+0x35/0x40 fs/inode.c:2030
filename_unlinkat+0x466/0x730 fs/namei.c:5723
__do_sys_unlink fs/namei.c:5754 [inline]
__se_sys_unlink fs/namei.c:5751 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5751
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: 0033:0x7f8ee699d247
RSP: 002b:00007ffd446a65c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8ee699d247
RDX: 00007ffd446a65f0 RSI: 00007ffd446a6680 RDI: 00007ffd446a6680
RBP: 00007ffd446a6680 R08: 00007ffd446a7680 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd446a7710
R13: 00007f8ee6a3448b R14: 00000000000b1e53 R15: 00007ffd446a7750
rcu: rcu_preempt kthread starved for 4171 jiffies! g125061 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:28984 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7277
preempt_schedule_common+0x3c/0xb0 kernel/sched/core.c:7456
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:221
__debug_object_init+0x2de/0x3d0 lib/debugobjects.c:810
timer_init_key_on_stack+0x2e/0x120 kernel/time/timer.c:816
schedule_timeout+0x115/0x280 kernel/time/sleep_timeout.c:96
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 11254 Comm: syz.2.1525 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:229
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 ba 7a 13 f6 48 89 df e8 42 d1 13 f6 e8 ed 99 40 f6 fb bf 01 00 00 00 a2 c7 02 f6 65 48 83 3d 81 95 b8 08 00 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc900043ffc90 EFLAGS: 00000206
RAX: 000000000b94ed21 RBX: ffff88802ca63780 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8e38ba9b RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000021
R13: ffff88802ca63b80 R14: dffffc0000000000 R15: ffff888032dacb00
FS: 00007f08bb8c36c0(0000) GS:ffff888123b59000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000002d502000 CR4: 00000000003526f0
Call Trace:
spin_unlock_irq include/linux/spinlock.h:413 [inline]
get_signal+0x195a/0x21e0 kernel/signal.c:3054
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08ba99e157
Code: 83 c8 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
RSP: 002b:00007f08bb8c30e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f08bac25fa8 RCX: 00007f08ba99e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f08bac25fa8
RBP: 00007f08bac25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f08bac26038 R14: 00007fffbeab6530 R15: 00007fffbeab6618