rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=b38c/1/0x4000000000000000 softirq=37329/37329 fqs=0
rcu: (detected by 0, t=10502 jiffies, g=43881, q=771 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10526 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [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+0x93/0x2c0 mm/kasan/generic.c:200
Code: 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb <41> 80 3b 00 0f 85 9e 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00
RSP: 0018:ffffc90000a08d00 EFLAGS: 00000082
RAX: 1ffff11006634601 RBX: fffffffffffffffe RCX: ffffffff8bc9a502
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffff8880331a3318
RBP: 0000000000000000 R08: ffff8880331a3327 R09: 1ffff11006634664
R10: dffffc0000000000 R11: ffffed1006634663 R12: 0000000000000002
R13: dffffc0000000000 R14: ffffed1006634665 R15: 1ffff11006634663
FS: 0000000000000000(0000) GS:ffff88812505a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a2bd61440 CR3: 000000005a830000 CR4: 00000000003526f0
Call Trace:
__asan_memset+0x22/0x50 mm/kasan/shadow.c:84
rb_erase_linked+0x142/0x170 lib/rbtree.c:460
timerqueue_linked_del include/linux/timerqueue.h:66 [inline]
__remove_hrtimer+0xf7/0x3e0 kernel/time/hrtimer.c:1155
__run_hrtimer kernel/time/hrtimer.c:2012 [inline]
__hrtimer_run_queues+0x295/0xa10 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:417
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 1b b9 61 f5 cc
RSP: 0018:ffffc9000cff6e58 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffffc9000cff6f18 RCX: 0000000000000046
RDX: 0000000000000001 RSI: ffffffff8e4aea3e RDI: ffff88807ee30000
RBP: 1ffffffff21f7a01 R08: ffffc9000cff7390 R09: 0000000000000000
R10: ffffc9000cff6f58 R11: fffff520019feded R12: ffffc9000cff0000
R13: ffffffff8176f21f R14: ffffc9000cff6f08 R15: ffffc9000cff73a0
rcu_read_unlock include/linux/rcupdate.h:873 [inline]
class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
unwind_next_frame+0x1baf/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x32d/0x660 mm/slub.c:5515
_kmalloc_noprof include/linux/slab.h:969 [inline]
slab_free_hook mm/slub.c:2657 [inline]
slab_free mm/slub.c:6405 [inline]
kmem_cache_free+0x156/0x650 mm/slub.c:6532
remove_vma mm/vma.c:473 [inline]
vms_complete_munmap_vmas+0x897/0xbe0 mm/vma.c:1361
__mmap_complete+0xab/0x4b0 mm/vma.c:2617
__mmap_region mm/vma.c:2783 [inline]
mmap_region+0x119f/0x2310 mm/vma.c:2860
do_mmap+0xc3b/0x10c0 mm/mmap.c:560
vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:606
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a2c043242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffdfc0d8658 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f0a2bd59000 RCX: 00007f0a2c043242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f0a2bd59000
RBP: 0000000000000812 R08: 0000000000000000 R09: 000000000000d000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffdfc0d8718
R13: 00007f0a2c018580 R14: 00007ffdfc0d8ad0 R15: 00000fffbf81b0ce
rcu: rcu_preempt kthread starved for 10502 jiffies! g43881 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:28368 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 5628 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x10b0/0x14b0 kernel/smp.c:892
Code: c0 75 73 41 8b 1e 89 de 83 e6 01 31 ff e8 d8 1e 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 84 1a 0c 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 69 1a 0c
RSP: 0018:ffffc9000401f580 EFLAGS: 00000293
RAX: ffffffff81ba5757 RBX: dffffc0000000000 RCX: ffff88807e99be00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000401f6a8 R08: ffffffff90576df7 R09: 1ffffffff20aedbe
R10: dffffc0000000000 R11: fffffbfff20aedbf R12: 1ffff110170e81d1
R13: ffff8880b863c448 R14: ffff8880b8740e88 R15: 0000000000000001
FS: 000055558de2c500(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee0fd556b8 CR3: 000000005ef76000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
__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+0x5c4/0x1090 arch/x86/mm/tlb.c:1451
dup_mmap+0x1786/0x1d90 mm/mmap.c:1905
dup_mm kernel/fork.c:1538 [inline]
copy_mm+0x11a/0x480 kernel/fork.c:1590
copy_process+0x1e99/0x43f0 kernel/fork.c:2288
kernel_clone+0x2d7/0x940 kernel/fork.c:2747
__do_sys_clone kernel/fork.c:2888 [inline]
__se_sys_clone kernel/fork.c:2872 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2872
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee0efc68d2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffddac54f90 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffddac54f90 RCX: 00007fee0efc68d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffddac5511c R08: 0000000000000000 R09: 0000000000000001
R10: 000055558de2c7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000d R14: 00000000000339cf R15: 00007ffddac55170