rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6520/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=18065, q=678 ncpus=2)
task:sed state:R
running task stack:23904 pid:6520 tgid:6520 ppid:6519 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:kasan_check_range+0x0/0x2c0 mm/kasan/generic.c:199
Code: fe 90 0f 0b 48 89 df 48 c7 c6 0f c8 16 8e e8 e7 30 f8 fe 90 0f 0b cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 55 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ae
RSP: 0018:ffffc90003907870 EFLAGS: 00000202
RAX: ffffffff82474501 RBX: 0000000000000010 RCX: ffffffff824746cd
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90003907aa0
RBP: 0000000000000100 R08: ffffc90003907acf R09: 1ffff92000720f59
R10: dffffc0000000000 R11: fffff52000720f5a R12: ffffffff824746cd
R13: 1ffff92000720f5b R14: ffffc90003907ac0 R15: ffffc90003907aa0
__asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
nd_jump_root+0x1cd/0x430 fs/namei.c:1143
path_init+0x433/0x1330 fs/namei.c:2717
path_lookupat+0x2a/0x8c0 fs/namei.c:2800
filename_lookup+0x256/0x5d0 fs/namei.c:2839
vfs_statx+0xfc/0x200 fs/stat.c:353
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f43411deeaa
RSP: 002b:00007ffea2a3c968 EFLAGS: 00000246
ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffea2a3c97b RCX: 00007f43411deeaa
RDX: 00007ffea2a3ca20 RSI: 00007ffea2a3c970 RDI: 00000000ffffff9c
RBP: 00007ffea2a3cae0 R08: 00007ffea2a3cb67 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000022
R13: 00007f43411b3050 R14: 0000000000000001 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 4179 jiffies! g18065 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:27648 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 6495 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d4 eb 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f e7 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 63 e7
RSP: 0018:ffffc90003837440 EFLAGS: 00000293
RAX: ffffffff81b9cd6d RBX: 1ffff110170c8525 RCX: ffff88807ebc5b80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003837580 R08: ffffffff9011ccb7 R09: 1ffffffff2023996
R10: dffffc0000000000 R11: fffffbfff2023997 R12: ffff8880b8642928
R13: dffffc0000000000 R14: ffff8880b873c000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb2579bab8 CR3: 000000000e54c000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
__flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
flush_tlb_mm_range+0x5c3/0x10c0 arch/x86/mm/tlb.c:1472
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:505 [inline]
tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:404
tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530
free_ldt_pgtables+0x19d/0x350 arch/x86/kernel/ldt.c:411
arch_exit_mmap arch/x86/include/asm/mmu_context.h:232 [inline]
exit_mmap+0x1af/0xa10 mm/mmap.c:1287
__mmput+0x118/0x430 kernel/fork.c:1175
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x6a2/0x23c0 kernel/exit.c:964
do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
get_signal+0x1284/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa863f99d8b
Code: Unable to access opcode bytes at 0x7fa863f99d61.
RSP: 002b:00007fa864dfef60 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 00000000ffffff75 RCX: 00007fa863f99d8b
RDX: 00007fa864dfefe0 RSI: 0000000040085507 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fa864300320 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00002000000002c0
R13: 0000000000000000 R14: 00007fa8641d5fa0 R15: 00007fff99fafe28