rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18596/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=113145, q=741 ncpus=2)
task:syz-executor state:R running task stack:22296 pid:18596 tgid:18596 ppid:18583 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0xf3/0x2550 include/linux/rcupdate.h:-1
Code: 74 28 80 3d 5c a4 a5 0e 00 75 1f c6 05 53 a4 a5 0e 01 48 c7 c7 40 b3 c9 8b be 4a 03 00 00 48 c7 c2 80 b3 c9 8b e8 6d 7a 2b 00 <48> 89 6c 24 38 48 89 5c 24 40 49 8d 5e 50 48 89 d8 48 c1 e8 03 48
RSP: 0018:ffffc90003c37460 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8bb32224 RCX: 0000000080000001
RDX: 000000005a44979c RSI: ffffffff8c2a9f60 RDI: ffffffff8c2a9f20
RBP: 1ffff92000786ea8 R08: ffffffff8176f21f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e959c20 R12: dffffc0000000000
R13: ffffffff8176f21f R14: ffffc90003c37508 R15: 1ffff92000786ea1
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]
__do_kmalloc_node mm/slub.c:5362 [inline]
__kmalloc_noprof+0x375/0x720 mm/slub.c:5387
_kmalloc_noprof include/linux/slab.h:973 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
lsm_blob_alloc security/security.c:218 [inline]
lsm_cred_alloc security/security.c:235 [inline]
security_prepare_creds+0x52/0x360 security/security.c:2866
prepare_creds+0x57d/0x820 kernel/cred.c:215
copy_creds+0x109/0x9f0 kernel/cred.c:286
copy_process+0xd1f/0x43f0 kernel/fork.c:2148
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: 0033:0x7f01a01c58d2
RSP: 002b:00007fff96c38c00 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff96c38c00 RCX: 00007f01a01c58d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff96c38d8c R08: 0000000000000000 R09: 0000000000000001
R10: 000055558bea47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000008914b R15: 00007fff96c38de0
rcu: rcu_preempt kthread starved for 9442 jiffies! g113145 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27752 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: 1 UID: 0 PID: 7572 Comm: udevd 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:ffffc900054ff580 EFLAGS: 00000293
RAX: ffffffff81ba5717 RBX: dffffc0000000000 RCX: ffff88802ed75d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900054ff6a8 R08: ffffffff9032d2f7 R09: 1ffffffff2065a5e
R10: dffffc0000000000 R11: fffffbfff2065a5f R12: 1ffff110170c85fd
R13: ffff8880b873c448 R14: ffff8880b8642fe8 R15: 0000000000000000
FS: 00007f0b5764b880(0000) GS:ffff888125326000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe1ea4f000 CR3: 0000000078c6e000 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
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:423
tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:549
unmap_region+0x2a5/0x330 mm/vma.c:491
vms_clear_ptes mm/vma.c:1303 [inline]
vms_complete_munmap_vmas+0x427/0xbe0 mm/vma.c:1345
do_vmi_align_munmap+0x3b7/0x4b0 mm/vma.c:1604
do_vmi_munmap+0x252/0x2d0 mm/vma.c:1652
__vm_munmap+0x241/0x3e0 mm/vma.c:3288
__do_sys_munmap mm/mmap.c:1079 [inline]
__se_sys_munmap mm/mmap.c:1076 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:1076
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: 0033:0x7f0b56f1e097
Code: 73 01 c3 48 8b 0d 61 2d 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 31 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe1ea4eea8 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055fbe3ebcbf0 RCX: 00007f0b56f1e097
RDX: 0000000000000000 RSI: 00000000009480e8 RDI: 00007f0b56400000
RBP: 000055fbe3ebc910 R08: 000055fbe3ecf140 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000206 R12: 000055fbdb4e9588
R13: 00007ffe1ea4ef30 R14: 0000000000000000 R15: 0000000000000000