rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9919/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=88313, q=343 ncpus=2)
task:syz-executor state:R running task stack:21752 pid:9919 tgid:9919 ppid:9915 task_flags:0x400140 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8b0 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lookup_page_ext mm/page_ext.c:265 [inline]
RIP: 0010:page_ext_get+0x1e4/0x2e0 mm/page_ext.c:532
Code: ff 85 ed 0f 84 f4 00 00 00 e8 98 34 89 ff 4d 85 ff 40 0f 95 c5 4c 89 fe 48 83 e6 01 41 0f 94 c4 31 ff e8 5f 39 89 ff 44 84 e5 <75> 07 e8 75 34 89 ff eb 1c 4c 0f af 35 1b 54 0e 18 4d 01 f7 74 0a
RSP: 0018:ffffc90006f47518 EFLAGS: 00000202
RAX: ffffffff823c8351 RBX: ffffffff823c8192 RCX: ffff88803572dd00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff823c8192 R09: ffffffff8e95cce0
R10: dffffc0000000000 R11: fffff9400045ab77 R12: 0000000000000201
R13: dffffc0000000000 R14: 000000000008b56e R15: ffff88801c580000
__reset_page_owner+0x28/0x1f0 mm/page_owner.c:306
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1397 [inline]
free_unref_folios+0xd9f/0x14c0 mm/page_alloc.c:2999
folios_put_refs+0x9ff/0xb40 mm/swap.c:1008
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x52c/0x1660 mm/shmem.c:1149
shmem_truncate_range mm/shmem.c:1277 [inline]
shmem_evict_inode+0x289/0xae0 mm/shmem.c:1407
evict+0x61e/0xb10 fs/inode.c:841
filename_unlinkat+0x43f/0x610 fs/namei.c:5572
__do_sys_unlink fs/namei.c:5603 [inline]
__se_sys_unlink+0x2e/0x140 fs/namei.c:5600
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f1179bf47
RSP: 002b:00007ffd30a76848 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7f1179bf47
RDX: 00007ffd30a76870 RSI: 00007ffd30a76900 RDI: 00007ffd30a76900
RBP: 00007ffd30a76900 R08: 00007ffd30a77900 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd30a77990
R13: 00007f7f118321ca R14: 00000000000b30b8 R15: 00007ffd30a779d0
rcu: rcu_preempt kthread starved for 10500 jiffies! g88313 f0x0 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:27736 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 14838 Comm: syz.8.1700 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xfd4/0x13d0 kernel/smp.c:892
Code: 89 ee 83 e6 01 31 ff e8 9a 07 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 45 03 0c 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 06 01 00 00 00 74 1e e8 2a 03 0c 00 eb e5 44 89
RSP: 0018:ffffc90005aafae0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880b863c188 RCX: 0000000000080000
RDX: ffffc900107dd000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90005aafc10 R08: ffffffff903021f7 R09: 1ffffffff206043e
R10: dffffc0000000000 R11: ffffffff81745300 R12: 1ffff110170e8171
R13: dffffc0000000000 R14: ffff8880b8740b88 R15: 0000000000000001
FS: 00007fe9c7e796c0(0000) GS:ffff88812529e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdfef34f52 CR3: 0000000059d0f000 CR4: 0000000000350ef0
Call Trace:
clock_was_set+0x70a/0x7d0 kernel/time/hrtimer.c:999
do_settimeofday64+0x340/0x570 kernel/time/timekeeping.c:1603
__do_sys_clock_settime kernel/time/posix-timers.c:1124 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1108 [inline]
__x64_sys_clock_settime+0x253/0x2a0 kernel/time/posix-timers.c:1108
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe9c6f9ce59
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:00007fe9c7e79028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fe9c7216090 RCX: 00007fe9c6f9ce59
RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000000
RBP: 00007fe9c7032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe9c7216128 R14: 00007fe9c7216090 R15: 00007ffd558e5ec8