rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10701/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=37709, q=118 ncpus=2)
task:syz.1.1271 state:R running task stack:21976 pid:10701 tgid:10701 ppid:5861 task_flags:0x400640 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7291
irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b 16 26 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003d3df58 EFLAGS: 00000206
RAX: 85e2aec94acbe400 RBX: 0000000000000000 RCX: 85e2aec94acbe400
RDX: 0000000000000000 RSI: ffffffff8dd9240a RDI: ffffffff8c03aa60
RBP: ffffffff8173bd25 R08: 0000000000000000 R09: ffffffff8173bd25
R10: ffffc90003d3e118 R11: ffffffff81ac5170 R12: 0000000000000002
R13: ffffffff8e33d260 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1169 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__set_page_owner+0x8d/0x4a0 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3869
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5159
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2435
shmem_alloc_folio mm/shmem.c:1884 [inline]
shmem_alloc_and_add_folio+0x4ba/0x10f0 mm/shmem.c:1923
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2546
shmem_get_folio mm/shmem.c:2652 [inline]
shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3303
generic_perform_write+0x2c5/0x900 mm/filemap.c:4209
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3478
__kernel_write_iter+0x428/0x910 fs/read_write.c:619
dump_emit_page fs/coredump.c:1298 [inline]
dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
coredump_write+0x116c/0x1900 fs/coredump.c:1049
vfs_coredump+0x1db5/0x2a60 fs/coredump.c:1170
get_signal+0x1108/0x1340 kernel/signal.c:3019
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
irqentry_exit_to_user_mode+0x7e/0x110 kernel/entry/common.c:73
exc_page_fault+0xab/0x100 arch/x86/mm/fault.c:1535
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f6f0fd8ec31
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6f0ffd5fa0 RCX: 00007f6f0fd8ec29
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f6f0fe11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f6f0ffd6038 R14: 00007f6f0ffd5fa0 R15: 00007ffdb6fdc638
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g37709 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=35537
rcu: rcu_preempt kthread starved for 10500 jiffies! g37709 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:26464 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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: 10746 Comm: syz.4.1283 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__kasan_check_write+0x6/0x20 mm/kasan/shadow.c:37
Code: e9 ef e4 ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 <48> 8b 0c 24 ba 01 00 00 00 e9 bc e4 ff ff 66 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc90000a08bf8 EFLAGS: 00000086
RAX: ffffffff89a345de RBX: 0000000000000004 RCX: ffff88801d28bc80
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffff8880531d8484
RBP: ffff8880531d8484 R08: ffff88803410d2e7 R09: 1ffff11006821a5c
R10: dffffc0000000000 R11: ffffed1006821a5d R12: 0000000000000001
R13: 0000000000000000 R14: ffff88803410d2e0 R15: ffff8880531d8400
FS: 00007fc77b8d16c0(0000) GS:ffff888125ae7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000037030 CR3: 0000000011438000 CR4: 00000000003526f0
Call Trace:
instrument_atomic_write include/linux/instrumented.h:82 [inline]
atomic_set include/linux/atomic/atomic-instrumented.h:67 [inline]
taprio_set_budgets+0x256/0x3b0 net/sched/sch_taprio.c:677
advance_sched+0x963/0xc90 net/sched/sch_taprio.c:982
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:100 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0xa5/0x2c0 mm/kasan/generic.c:200
Code: 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 de 01 00 00 <49> ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd 83 e5 07 0f 84 b5
RSP: 0018:ffffc90003707868 EFLAGS: 00000246
RAX: ffffffff89605501 RBX: fffffffffffffff8 RCX: ffffffff896055ef
RDX: 0000000000000001 RSI: 0000000000000080 RDI: ffffc90003707940
RBP: 0000000000000000 R08: ffffc900037079bf R09: 1ffff920006e0f37
R10: dffffc0000000000 R11: fffff520006e0f30 R12: 0000000000000010
R13: dffffc0000000000 R14: fffff520006e0f38 R15: 1ffff920006e0f28
__asan_memset+0x22/0x50 mm/kasan/shadow.c:84
____sys_recvmsg+0xaf/0x460 net/socket.c:2819
___sys_recvmsg+0x1b5/0x510 net/socket.c:2879
do_recvmmsg+0x307/0x770 net/socket.c:2974
__sys_recvmmsg net/socket.c:3048 [inline]
__do_sys_recvmmsg net/socket.c:3071 [inline]
__se_sys_recvmmsg net/socket.c:3064 [inline]
__x64_sys_recvmmsg+0x190/0x240 net/socket.c:3064
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc77a98ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc77b8d1038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fc77abd6090 RCX: 00007fc77a98ec29
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fc77aa11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc77abd6128 R14: 00007fc77abd6090 R15: 00007fffda1a2e78