rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8995/1:b..l P8874/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=38369, q=204 ncpus=2)
task:syz.1.971 state:R running task stack:23352 pid:8874 tgid:8874 ppid:5601 task_flags:0x40064c 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_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:debug_lockdep_rcu_enabled+0x2b/0x40 kernel/rcu/update.c:320
Code: 0f 1e fa 8b 05 e6 07 71 06 85 c0 74 20 8b 05 70 38 71 06 85 c0 74 16 65 48 8b 05 78 3e b9 09 8b 80 a4 0b 00 00 85 c0 0f 94 c0 <0f> b6 c0 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90
RSP: 0018:ffffc90003676f18 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc900036772d0 RCX: ffffffff92f68101
RDX: ffffc900036772d8 RSI: ffffc900036772a0 RDI: ffffc90003676fa0
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 000000000001721e R12: ffffc90003676fe0
R13: ffffc90003676f90 R14: ffffc900036772d0 R15: ffffc90003676fc4
rcu_read_unlock include/linux/rcupdate.h:878 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x3a8/0x2090 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
__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: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: 0033:0x7f73d5b9e1e1
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f73d5e25fa0 RCX: 00007f73d5b9e1d9
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f73d5c35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f73d5e26038 R14: 00007f73d5e25fa0 R15: 00007ffc9d6824f8
task:syz.1.1010 state:R running task stack:25720 pid:8995 tgid:8994 ppid:5601 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_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:unwind_next_frame+0x13d/0x2090 arch/x86/kernel/unwind_orc.c:510
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 53 0a 00 00 41 f6 86 88 00 00 00 03 0f 85 3b 02 00 00 <48> b8 00 00 00 00 00 fc ff df 4d 8d 75 35 4c 89 f2 48 c1 ea 03 0f
RSP: 0018:ffffc90005936b10 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000200
RDX: 1ffff92000b26d7a RSI: ffffffff8c625500 RDI: ffffffff8e6af920
RBP: ffffc90005936bc8 R08: 0000000089dd9fc4 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: ffffc90005936bd0
R13: ffffc90005936b80 R14: 0000000000000000 R15: ffff8880780b4b00
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
populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
__mm_populate+0x107/0x3a0 mm/gup.c:1963
mm_populate include/linux/mm.h:4288 [inline]
vm_mmap_pgoff+0x441/0x470 mm/util.c:586
ksys_mmap_pgoff+0xe4/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:89
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: 0033:0x7f73d5b9e1d9
RSP: 002b:00007f73d6a24028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f73d5e25fa0 RCX: 00007f73d5b9e1d9
RDX: b635773f06ebbeea RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f73d5c35888 R08: ffffffffffffffff R09: 0000000028f43000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f73d5e26038 R14: 00007f73d5e25fa0 R15: 00007ffc9d6824f8
rcu: rcu_preempt kthread starved for 10420 jiffies! g38369 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27560 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: 1 UID: 0 PID: 8990 Comm: syz.4.1006 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:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x577/0x18c0 kernel/smp.c:944
Code: e4 74 50 48 b8 00 00 00 00 00 fc ff df 48 89 ea 49 89 ec 48 c1 ea 03 41 83 e4 07 4c 8d 2c 02 41 83 c4 03 e8 0b c8 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 51 11 00 00 44 8b 73 08
RSP: 0018:ffffc900065275f8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8243e20 RCX: 0000000000000001
RDX: ffff888031e3cb00 RSI: ffffffff81ff7e45 RDI: ffff888031e3cb00
RBP: ffff8880b8243e28 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003
R13: ffffed10170487c5 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888122a46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000036030 CR3: 000000007cc00000 CR4: 00000000003526f0
Call Trace:
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x3c9/0x1360 arch/x86/mm/tlb.c:1435
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:499 [inline]
tlb_flush_mmu mm/mmu_gather.c:423 [inline]
tlb_finish_mmu+0x3fe/0x810 mm/mmu_gather.c:549
exit_mmap+0x454/0xa00 mm/mmap.c:1328
__mmput+0x12a/0x410 kernel/fork.c:1193
mmput+0x67/0x80 kernel/fork.c:1216
exit_mm kernel/exit.c:592 [inline]
do_exit+0x83b/0x2a50 kernel/exit.c:974
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+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: 0033:0x7f505459e1d9
Code: Unable to access opcode bytes at 0x7f505459e1af.
RSP: 002b:00007f50554e90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5054826098 RCX: 00007f505459e1d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5054826098
RBP: 00007f5054826090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5054826128 R14: 00007ffdafa2bfd0 R15: 00007ffdafa2c0b8