rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17165/1:b..l P17525/1:b..l P12625/1:b..l P17302/1:b..l
rcu: (detected by 0, t=10578 jiffies, g=126693, q=709 ncpus=2)
task:syz.8.2732 state:R running task stack:21592 pid:17302 tgid:17302 ppid:16310 task_flags:0x400740 flags:0x00080001
Call Trace:
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:trace_lock_acquire include/trace/events/lock.h:23 [inline]
RIP: 0010:lock_acquire+0x4a/0x380 kernel/locking/lockdep.c:5905
Code: 65 4c 8b 3d 70 1e a6 13 4c 89 7c 24 30 4d 89 cf 66 90 65 8b 05 8f 1e a6 13 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 9e e5 5d 10 <0f> 82 c9 02 00 00 8b 35 3e 17 5e 10 85 f6 0f 85 c7 00 00 00 48 8b
RSP: 0018:ffffc900034a5f20 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8fdec5e0
RBP: ffffffff8fdec5e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000015a50 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
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
__set_page_owner+0x8c/0x540 mm/page_owner.c:359
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
alloc_pages_mpol+0x201/0x550 mm/mempolicy.c:2486
folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2505
shmem_alloc_folio+0x135/0x160 mm/shmem.c:1936
shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1978
shmem_get_folio_gfp+0x75b/0x1980 mm/shmem.c:2531
shmem_fault+0x1fb/0xa30 mm/shmem.c:2732
__do_fault+0x10b/0x440 mm/memory.c:5565
do_read_fault mm/memory.c:6000 [inline]
do_fault+0xb3f/0x1830 mm/memory.c:6134
do_pte_missing mm/memory.c:4700 [inline]
handle_pte_fault mm/memory.c:6558 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6707
handle_mm_fault+0x363/0xa20 mm/memory.c:6876
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x8ae/0x2c30 mm/gup.c:1428
__get_user_pages_locked mm/gup.c:1692 [inline]
get_dump_page+0x27e/0x3d0 mm/gup.c:2192
dump_user_range+0x18d/0xad0 fs/coredump.c:1361
elf_core_dump+0x2d68/0x3d20 fs/binfmt_elf.c:2106
coredump_write fs/coredump.c:1047 [inline]
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x281a/0x54a0 fs/coredump.c:1195
get_signal+0x1f2a/0x21e0 kernel/signal.c:3097
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 kernel/entry/common.c:101 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x402/0xa10 kernel/entry/common.c:165
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x0
RSP: 002b:0000200000000048 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fd25fc25fa0 RCX: 00007fd25f99e2d9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000020000
RBP: 00007fd25fa35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fd25fc26038 R14: 00007fd25fc25fa0 R15: 00007ffd695110c8
task:syz-executor state:R running task stack:23576 pid:12625 tgid:12625 ppid:12605 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_common+0x3c/0xb0 kernel/sched/core.c:7463
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__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]
copy_pte_range mm/memory.c:1429 [inline]
copy_pmd_range mm/memory.c:1490 [inline]
copy_pud_range mm/memory.c:1527 [inline]
copy_p4d_range mm/memory.c:1551 [inline]
copy_page_range+0x1c66/0x57c0 mm/memory.c:1637
dup_mmap+0x1230/0x2370 mm/mmap.c:1819
dup_mm kernel/fork.c:1543 [inline]
copy_mm kernel/fork.c:1595 [inline]
copy_process+0x4821/0x8380 kernel/fork.c:2311
kernel_clone+0x176/0x9d0 kernel/fork.c:2771
__do_sys_clone+0xd9/0x120 kernel/fork.c:2913
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: 0033:0x7f4fec7c6d52
RSP: 002b:00007ffd0ad2b0b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd0ad2b0b0 RCX: 00007f4fec7c6d52
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffd0ad2b23c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555839997d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000016e9bf R15: 00007ffd0ad2b290
task:syz.3.2783 state:R running task stack:22984 pid:17525 tgid:17525 ppid:5603 task_flags:0x400740 flags:0x00080000
Call Trace:
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:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 8f 1e a6 13 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 9e e5 5d 10 0f 82 c9 02 00 00 8b 35 3e 17 5e 10 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 2d 1e a6 13 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc900037ae218 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000000 RSI: ffffffff8e3bd2b4 RDI: ffffffff8c625580
RBP: ffffffff8fdec5e0 R08: 00000000b52581ac R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
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
__set_page_owner+0x8c/0x540 mm/page_owner.c:359
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
alloc_pages_mpol+0x201/0x550 mm/mempolicy.c:2486
folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2505
shmem_alloc_folio+0x135/0x160 mm/shmem.c:1936
shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1978
shmem_get_folio_gfp+0x75b/0x1980 mm/shmem.c:2531
shmem_get_folio mm/shmem.c:2637 [inline]
shmem_write_begin+0x1a4/0x420 mm/shmem.c:3268
generic_perform_write+0x292/0xa40 mm/filemap.c:4374
shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3443
__kernel_write_iter+0x2ac/0x930 fs/read_write.c:621
dump_emit_page fs/coredump.c:1293 [inline]
dump_user_range+0x3f9/0xad0 fs/coredump.c:1367
elf_core_dump+0x2d68/0x3d20 fs/binfmt_elf.c:2106
coredump_write fs/coredump.c:1047 [inline]
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x281a/0x54a0 fs/coredump.c:1195
get_signal+0x1f2a/0x21e0 kernel/signal.c:3097
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 kernel/entry/common.c:101 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x402/0xa10 kernel/entry/common.c:165
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f251719e2e1
RSP: 002b:fffffffffffffe20 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f2517425fa0 RCX: 00007f251719e2d9
RDX: 0000000000000000 RSI: fffffffffffffe20 RDI: 0000000000020000
RBP: 00007f2517235888 R08: 0000200000000100 R09: 0000200000000100
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f2517426038 R14: 00007f2517425fa0 R15: 00007ffd36153348
task:syz.6.2702 state:R running task stack:22152 pid:17165 tgid:17165 ppid:12625 task_flags:0x40074c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_common+0x3c/0xb0 kernel/sched/core.c:7463
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
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1535 [inline]
folios_put_refs+0x4f2/0xaa0 mm/folio.c:1028
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
dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
dentry_kill+0x25d/0xc20 fs/dcache.c:826
finish_dput fs/dcache.c:1001 [inline]
dput.part.0+0xd7/0x240 fs/dcache.c:1042
dput+0x1f/0x30 fs/dcache.c:1037
__fput+0x51a/0xb60 fs/file_table.c:520
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x8da/0x2a50 kernel/exit.c:986
do_group_exit+0xd5/0x2a0 kernel/exit.c:1129
get_signal+0x1ec7/0x21e0 kernel/signal.c:3112
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 kernel/entry/common.c:101 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x402/0xa10 kernel/entry/common.c:165
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x0
RSP: 002b:0000200000000048 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4feca25fa0 RCX: 00007f4fec79e2d9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000020000
RBP: 00007f4fec835888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f4feca26038 R14: 00007f4feca25fa0 R15: 00007ffd0ad2ae98
rcu: rcu_preempt kthread starved for 10723 jiffies! g126693 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27400 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 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: 97 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 38 17 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:ffffffff8fa07cf0 EFLAGS: 00000242
RAX: 0000000004d4a7bf RBX: ffffffff8fa91580 RCX: ffffffff8bd48235
RDX: 0000000000000001 RSI: ffffffff8e3e346f RDI: ffffffff8c625580
RBP: fffffbfff1f522b0 R08: 0000000000000001 R09: ffffed10170467bd
R10: ffff8880b8233deb R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffffffff1f40fa2 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888122946000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f894c35d520 CR3: 000000002b061000 CR4: 00000000003526f0
Call Trace:
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
rest_init+0x2d3/0x2e0 init/main.c:732
start_kernel+0x48e/0x490 init/main.c:1190
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x158