rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12166/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=49573, q=770 ncpus=2)
task:syz.6.1606 state:R running task stack:23240 pid:12166 tgid:12166 ppid:11513 task_flags:0x400640 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875
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 2b 9e fb 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9001126e398 EFLAGS: 00000206
RAX: 4749064d6183b100 RBX: 0000000000000000 RCX: 4749064d6183b100
RDX: 0000000000000000 RSI: ffffffff8db5aaa7 RDI: ffffffff8be1b7c0
RBP: ffffffff81729af5 R08: 0000000000000000 R09: ffffffff81729af5
R10: ffffc9001126e558 R11: ffffffff81acf5a0 R12: 0000000000000002
R13: ffffffff8e13eda0 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:1155 [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+0xf7/0x1f0 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:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2438
shmem_alloc_folio mm/shmem.c:1851 [inline]
shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1890
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2532
shmem_get_folio mm/shmem.c:2638 [inline]
shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3288
generic_perform_write+0x2c7/0x910 mm/filemap.c:4112
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3463
__kernel_write_iter+0x390/0x860 fs/read_write.c:619
dump_emit_page fs/coredump.c:1112 [inline]
dump_user_range+0x873/0xc70 fs/coredump.c:1186
elf_core_dump+0x32ed/0x3900 fs/binfmt_elf.c:2075
do_coredump+0x2809/0x3440 fs/coredump.c:950
get_signal+0x10d9/0x1310 kernel/signal.c:3019
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:184
exc_general_protection+0x171/0x200 arch/x86/kernel/traps.c:792
asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617
RIP: 0033:0x7f977ab8e931
RSP: 002b:00002000000001d0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f977adb5fa0 RCX: 00007f977ab8e929
RDX: 0000200000000080 RSI: 00002000000001d0 RDI: 0000000080000080
RBP: 00007f977ac10b39 R08: 00002000000002c0 R09: 00002000000002c0
R10: 0000200000000200 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f977adb5fa0 R15: 00007ffd0c3376d8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10474 jiffies! g49573 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=49285
rcu: rcu_preempt kthread starved for 10475 jiffies! g49573 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:27320 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
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: 12174 Comm: syz.3.1615 Not tainted 6.16.0-rc2-syzkaller-00278-g3f75bfff44be #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kasan_check_range+0x1d3/0x2c0 mm/kasan/generic.c:189
Code: 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 45 84 ff 75 63 41
RSP: 0018:ffffc90000a08c98 EFLAGS: 00000056
RAX: ffffffff8b5b5701 RBX: 0000000000000000 RCX: ffffffff8b5b57a6
RDX: 0000000000000001 RSI: 0000000000000018 RDI: ffff88806d66b340
RBP: 0000000000000000 R08: ffff88806d66b357 R09: 1ffff1100dacd66a
R10: dffffc0000000000 R11: ffffed100dacd66b R12: 0000000000000003
R13: dffffc0000000000 R14: ffffed100dacd66b R15: 1ffff1100dacd668
FS: 00007f154ef476c0(0000) GS:ffff888125d83000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 000000001d2b8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__asan_memset+0x22/0x50 mm/kasan/shadow.c:84
rb_link_node include/linux/rbtree.h:63 [inline]
rb_add_cached include/linux/rbtree.h:182 [inline]
timerqueue_add+0x186/0x200 lib/timerqueue.c:40
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_x2apic_icr_write arch/x86/include/asm/apic.h:233 [inline]
RIP: 0010:__x2apic_send_IPI_dest arch/x86/kernel/apic/x2apic_phys.c:113 [inline]
RIP: 0010:x2apic_send_IPI+0x73/0xe0 arch/x86/kernel/apic/x2apic_phys.c:50
Code: 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 75 42 41 8b 16 0f ae f0 0f ae e8 83 fb 02 b8 00 04 00 00 0f 45 c3 b9 30 08 00 00 0f 30 <66> 90 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 89 fe 89 fd 48 c7
RSP: 0018:ffffc9001127f830 EFLAGS: 00000206
RAX: 00000000000000fb RBX: 00000000000000fb RCX: 0000000000000830
RDX: 0000000000000000 RSI: 00000000000000fb RDI: 0000000000000000
RBP: ffffc9001127f910 R08: ffffffff8f9fe2f7 R09: 1ffffffff1f3fc5e
R10: dffffc0000000000 R11: ffffffff81703110 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880b86201b0 R15: ffffffff8db92c60
arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:95 [inline]
send_call_function_single_ipi kernel/smp.c:118 [inline]
__smp_call_single_queue+0x1cb/0x370 kernel/smp.c:411
generic_exec_single+0x20e/0x500 kernel/smp.c:444
smp_call_function_single_async+0x79/0x110 kernel/smp.c:724
rdmsr_safe_on_cpu+0x127/0x230 arch/x86/lib/msr-smp.c:179
msr_read+0x14d/0x250 arch/x86/kernel/msr.c:66
vfs_read+0x200/0x980 fs/read_write.c:570
ksys_read+0x145/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f154e18e929
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:00007f154ef47038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f154e3b5fa0 RCX: 00007f154e18e929
RDX: 0000000000018ff8 RSI: 0000200000001a40 RDI: 000000000000000a
RBP: 00007f154e210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f154e3b5fa0 R15: 00007ffe9345d708