rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7926/1:b..l P7980/2:b..l P7993/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=32921, q=224 ncpus=2)
task:syz.4.611 state:R running task stack:23688 pid:7993 tgid:7993 ppid:5616 task_flags:0x400640 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
follow_page_pte+0x496/0x13f0 mm/gup.c:889
follow_pmd_mask mm/gup.c:928 [inline]
follow_pud_mask mm/gup.c:967 [inline]
follow_p4d_mask mm/gup.c:984 [inline]
follow_page_mask mm/gup.c:1023 [inline]
__get_user_pages+0x741/0x32a0 mm/gup.c:1426
__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:1372
elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2109
coredump_write fs/coredump.c:1053 [inline]
do_coredump fs/coredump.c:1132 [inline]
vfs_coredump+0x29a0/0x5770 fs/coredump.c:1206
get_signal+0x2162/0x2210 kernel/signal.c:3022
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop kernel/entry/common.c:98 [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+0x410/0x7e0 kernel/entry/common.c:162
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f8eab79ce61
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f8eaba15fa0 RCX: 00007f8eab79ce59
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f8eab832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f8eaba16038 R14: 00007f8eaba15fa0 R15: 00007fff9026e388
task:syz.2.610 state:R running task stack:25864 pid:7980 tgid:7979 ppid:5610 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
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+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x19e/0x310 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 db e2 26 12 83 f8 01 0f 85 28 01 00 00 9c 58 f6 c4 02 0f 85 13 01 00 00 41 f7 c6 00 02 00 00 0f 85 c0 00 00 00 <48> 8b 44 24 10 65 48 2b 05 2d 9b 26 12 0f 85 4e 01 00 00 48 83 c4
RSP: 0018:ffffc900053af440 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e7e5620 RCX: ffffc900053af44c
RDX: 0000000000000002 RSI: ffffffff8defcec5 RDI: ffffffff8c1c3a00
RBP: ffffffff827ea0d7 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: ffff88807a120000
R13: ffffed10046f0d8e R14: 0000000000000202 R15: 0000000000000003
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock+0x1c/0x60 include/linux/rcupdate.h:869
percpu_ref_tryget_many include/linux/percpu-refcount.h:250 [inline]
percpu_ref_tryget include/linux/percpu-refcount.h:266 [inline]
css_tryget include/linux/cgroup_refcnt.h:45 [inline]
css_tryget include/linux/cgroup_refcnt.h:42 [inline]
get_mem_cgroup_from_mm+0x29c/0x5e0 mm/memcontrol.c:1145
__mem_cgroup_charge+0x1a/0x1c0 mm/memcontrol.c:5031
mem_cgroup_charge include/linux/memcontrol.h:644 [inline]
folio_prealloc mm/memory.c:1198 [inline]
wp_page_copy mm/memory.c:3859 [inline]
do_wp_page+0xda4/0x4350 mm/memory.c:4320
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1385
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca e9 c7 d7 03 00 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900053af9d8 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000002ef030
RDX: 0000000000080000 RSI: ffffffff8955e3d1 RDI: ffff88807a120000
RBP: ffffc900053afd78 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: 00002000002ef000 R14: ffffc900053afdbc R15: 0000000000000002
____sys_recvmsg+0x2ec/0x640 net/socket.c:2931
___sys_recvmsg+0x16a/0x1a0 net/socket.c:2960
do_recvmmsg+0x301/0x760 net/socket.c:3055
__sys_recvmmsg net/socket.c:3129 [inline]
__do_sys_recvmmsg net/socket.c:3152 [inline]
__se_sys_recvmmsg net/socket.c:3145 [inline]
__x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3145
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbcfd9ce59
RSP: 002b:00007fdbd0b85028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fdbd0015fa0 RCX: 00007fdbcfd9ce59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007fdbcfe32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbd0016038 R14: 00007fdbd0015fa0 R15: 00007ffd2ea4cbf8
task:syz.0.593 state:R running task stack:25608 pid:7926 tgid:7925 ppid:5618 task_flags:0x40054c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_notrace+0x5f/0xd0 kernel/sched/core.c:7463
preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:753
rcu_read_unlock include/linux/rcupdate.h:867 [inline]
class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0x745/0x2090 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:165
__reset_page_owner+0x84/0x190 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
free_unref_folios+0xa0d/0x16f0 mm/page_alloc.c:3004
folios_put_refs+0x571/0xa90 mm/swap.c:1008
free_pages_and_swap_cache+0x22d/0x3b0 mm/swap_state.c:401
__tlb_batch_free_encoded_pages+0xe9/0x280 mm/mmu_gather.c:138
tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
tlb_flush_mmu+0xe9/0x590 mm/mmu_gather.c:424
zap_pte_range mm/memory.c:1957 [inline]
zap_pmd_range mm/memory.c:2004 [inline]
zap_pud_range mm/memory.c:2032 [inline]
zap_p4d_range mm/memory.c:2053 [inline]
__zap_vma_range+0x230e/0x4bf0 mm/memory.c:2093
unmap_vmas+0x299/0x5f0 mm/memory.c:2162
exit_mmap+0x1ef/0xa10 mm/mmap.c:1300
__mmput+0x12a/0x410 kernel/fork.c:1178
mmput+0x67/0x80 kernel/fork.c:1201
exit_mm kernel/exit.c:582 [inline]
do_exit+0x8b2/0x2af0 kernel/exit.c:964
do_group_exit+0xd5/0x2a0 kernel/exit.c:1119
get_signal+0x20ff/0x2210 kernel/signal.c:3037
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98
__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:318 [inline]
do_syscall_64+0x706/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81fe99ce59
RSP: 002b:00007f81ff8c9028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 000000000003fffd RBX: 00007f81fec15fa0 RCX: 00007f81fe99ce59
RDX: 0000000004000087 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f81fea32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81fec16038 R14: 00007f81fec15fa0 R15: 00007ffd70c20ab8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g32921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=14315
rcu: rcu_preempt kthread starved for 10502 jiffies! g32921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28216 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8001 Comm: syz.3.616 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__remove_hrtimer+0x8a/0x440 kernel/time/hrtimer.c:1147
Code: 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 31 03 00 00 44 8b 35 0d 8a e3 0e 31 ff 44 89 f6 e8 cf 31 14 00 45 85 f6 0f 85 d7 02 00 00 11 37 14 00 48 8d 7b 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa
RSP: 0018:ffffc90000a08e40 EFLAGS: 00000002
RAX: 0000000080010002 RBX: ffff8880357cc300 RCX: ffffffff81f47ae0
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8880332d8000
RBP: ffff8880b8528600 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880b85284c0 R14: 0000000000000001 R15: 0000000000000000
FS: 00007fa794ec56c0(0000) GS:ffff88812446d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33916ff8 CR3: 000000002c90a000 CR4: 00000000003526f0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1910 [inline]
__hrtimer_run_queues+0x359/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x2d3/0x1010 kernel/sched/core.c:5245
Code: 2f 0a 00 00 41 c7 87 e0 0d 00 00 00 00 00 00 e9 0f 04 00 00 49 8d 7f 48 e8 fa 79 b8 09 e8 45 9b 3b 00 fb 48 8d bb b0 16 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc9000586f730 EFLAGS: 00000202
RAX: 0000000000003867 RBX: ffff8880332d8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df223d3 RDI: ffff8880332d96b0
RBP: ffffc9000586f788 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88803312ca00
R13: 0000000000000001 R14: ffffffff90d801e4 R15: ffff8880b853b240
context_switch kernel/sched/core.c:5391 [inline]
__schedule+0x129d/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
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+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 56 61 5c 00 48 89 df 5b e9 1d ec 61 00 be 03 00 00 00 5b e9 72 e0 f0 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 25 81 02 12 48 8b 34 24 65 48 8b 15 01 81 02
RSP: 0018:ffffc9000586fa10 EFLAGS: 00000286
RAX: dffffc0000000000 RBX: ffffc9000586fd78 RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000586fb90 R08: ffffc9000586fb70 R09: ffffc9000586fd88
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc9000586fb70 R14: ffffc9000586fd88 R15: 0000000000000000
get_current arch/x86/include/asm/current.h:23 [inline]
in_32bit_syscall arch/x86/include/asm/compat.h:94 [inline]
in_compat_syscall arch/x86/include/asm/compat.h:100 [inline]
import_iovec+0x2c/0x130 lib/iov_iter.c:1441
copy_msghdr_from_user+0x2ed/0x4f0 net/socket.c:2635
recvmsg_copy_msghdr net/socket.c:2884 [inline]
___sys_recvmsg+0xdd/0x1a0 net/socket.c:2956
do_recvmmsg+0x301/0x760 net/socket.c:3055
__sys_recvmmsg net/socket.c:3129 [inline]
__do_sys_recvmmsg net/socket.c:3152 [inline]
__se_sys_recvmmsg net/socket.c:3145 [inline]
__x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3145
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa793f9ce59
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:00007fa794ec5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fa794215fa0 RCX: 00007fa793f9ce59
RDX: 00000000080002c1 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fa794032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa794216038 R14: 00007fa794215fa0 R15: 00007ffde6d911e8