rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6189/1:b..l P6098/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=10537, q=983 ncpus=2)
task:syz.0.30 state:R running task stack:21584 pid:6098 tgid:6098 ppid:5818 task_flags:0x40064c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:218 [inline]
RIP: 0010:unwind_next_frame+0x23d/0x20a0 arch/x86/kernel/unwind_orc.c:494
Code: 89 74 24 20 89 44 24 18 e8 30 ed ba 00 48 8b 4c 24 30 48 8b 44 24 28 8b 74 24 20 44 8b 5c 24 18 8d 50 01 8b 0c 8d 9c da da 91 <48> b8 00 00 00 00 00 fc ff df 48 8d 3c 95 9c da da 91 49 89 f8 49
RSP: 0018:ffffc900059bef60 EFLAGS: 00000246
RAX: 000000000001422a RBX: 0000000000000001 RCX: 000000000003e787
RDX: 000000000001422b RSI: 00000000000a6a3f RDI: ffffffff91dfe344
RBP: ffffc900059bf018 R08: 0000000000000000 R09: 00000000ffffffff
R10: ffff888028b18b30 R11: 000000000001422a R12: ffffc900059bf020
R13: ffffc900059befd0 R14: ffffc900059bf005 R15: ffffffff82422a81
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x84/0x1a0 mm/page_owner.c:311
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
free_unref_folios+0xa15/0x1600 mm/page_alloc.c:2958
folios_put_refs+0x4be/0x750 mm/swap.c:1002
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x58f/0x1140 mm/shmem.c:1119
shmem_truncate_range mm/shmem.c:1231 [inline]
shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1359
evict+0x3c2/0xad0 fs/inode.c:837
iput_final fs/inode.c:1951 [inline]
iput.part.0+0x621/0x1190 fs/inode.c:2003
iput+0x35/0x40 fs/inode.c:1966
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:467
__dentry_kill+0x1d0/0x600 fs/dcache.c:670
dput.part.0+0x4b1/0x9b0 fs/dcache.c:912
dput+0x1f/0x30 fs/dcache.c:902
__fput+0x51c/0xb70 fs/file_table.c:476
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x87f/0x2bd0 kernel/exit.c:973
do_group_exit+0xd3/0x2a0 kernel/exit.c:1114
get_signal+0x2671/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f0d7698f751
RSP: 002b:fffffffffffffef0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f0d76be5fa0 RCX: 00007f0d7698f749
RDX: 0000000000000000 RSI: fffffffffffffef0 RDI: 0000000000a00200
RBP: 00007f0d76a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f0d76be6038 R14: 00007f0d76be5fa0 R15: 00007ffd239cde08
task:syz.4.55 state:R running task stack:23056 pid:6189 tgid:6189 ppid:5835 task_flags:0x400640 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_is_watching+0x0/0xc0 kernel/rcu/tree.c:747
Code: 3a 3d 8e e8 22 f6 38 03 e9 51 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 53 65 ff 05 23 91 09 12 e8 4e e0 c3 09 48 c7 c3 e8
RSP: 0018:ffffc90005fa6d20 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8b5f7c9f
RDX: ffff88802dd38000 RSI: ffffffff8b5f8116 RDI: 0000000000000005
RBP: 1ffff92000bf4dc9 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000069b3c517 R12: 0000000000000001
R13: ffffc90005fa6e68 R14: ffffffffffffffff R15: 0000000000000000
rcu_read_lock include/linux/rcupdate.h:868 [inline]
mt_find+0x5db/0xa20 lib/maple_tree.c:6495
find_vma+0xbf/0x140 mm/mmap.c:909
gup_vma_lookup+0x24/0x220 mm/gup.c:1275
__get_user_pages+0x241/0x33c0 mm/gup.c:1396
__get_user_pages_locked mm/gup.c:1692 [inline]
get_dump_page+0x257/0x3d0 mm/gup.c:2192
dump_user_range+0x195/0xb70 fs/coredump.c:1366
elf_core_dump+0x29c3/0x3c10 fs/binfmt_elf.c:2111
coredump_write fs/coredump.c:1049 [inline]
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x2b85/0x55e0 fs/coredump.c:1200
get_signal+0x22e1/0x26d0 kernel/signal.c:3019
arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fa970b8f751
RSP: 002b:00000000fffffd10 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fa970de5fa0 RCX: 00007fa970b8f749
RDX: 0000000000000000 RSI: 00000000fffffd10 RDI: 0000000001000000
RBP: 00007fa970c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fa970de6038 R14: 00007fa970de5fa0 R15: 00007ffec44c7d58
rcu: rcu_preempt kthread starved for 10598 jiffies! g10537 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:28192 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 76 70 02 e9 93 2f 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 13 13 24 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c2
RAX: 000000000034220d RBX: 0000000000000001 RCX: ffffffff8b6646f9
RDX: 0000000000000000 RSI: ffffffff8dabd2db RDI: ffffffff8bf21180
RBP: ffffed1003b55498 R08: 0000000000000001 R09: ffffed10170a671d
R10: ffff8880b85338eb R11: 00000000ffffffff R12: 0000000000000001
R13: ffff88801daaa4c0 R14: ffffffff90871dd0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124a60000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45d9e1d000 CR3: 0000000078c58000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x38d/0x510 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148