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WARNING: CPU: 0 PID: 7956 at kernel/rcu/tree_stall.h:989 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:989
Modules linked in:
CPU: 0 UID: 0 PID: 7956 Comm: syz.3.522 Not tainted 6.15.0-syzkaller-gfa6932577c07 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:989
Code: ff ff 48 c7 c7 20 44 ac 99 be 04 00 00 00 e8 b3 6a 7c 00 4c 89 f7 b8 01 00 00 00 87 05 65 8a 04 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 44 14 8e 74 47 48 c7 c0 30 3a a1 8f 48 c1 e8
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a7b9ad
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e144400
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3358884 R12: 0000000000002904
R13: 1ffff110170c7922 R14: ffffffff8e144400 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125c54000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f477e205e9c CR3: 0000000077f10000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_core+0x5f7/0x1710 kernel/rcu/tree.c:2827
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:122 [inline]
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:431 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x6a6/0xb60 kernel/locking/qspinlock.c:325
Code: 8b 44 24 40 42 0f b6 04 30 84 c0 0f 85 42 01 00 00 c6 07 00 43 0f b6 04 37 84 c0 0f 85 60 01 00 00 c6 01 01 41 be 00 80 ff ff <66> c7 84 24 90 00 00 00 00 01 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc90005337720 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff888022c46dc8 RCX: 1ffff11004588db9
RDX: 0000000000000000 RSI: ffffffff8d97d358 RDI: ffff8880b863c894
RBP: ffffc90005337838 R08: ffffffff8fa108f7 R09: 1ffffffff1f4211e
R10: dffffc0000000000 R11: fffffbfff1f4211f R12: 1ffffffff1bf5318
R13: 0000000000000000 R14: 00000000ffff9998 R15: 1ffff11004588db9
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x21f/0x290 kernel/locking/spinlock_debug.c:116
spin_lock include/linux/spinlock.h:351 [inline]
lock_for_kill+0xdc/0x210 fs/dcache.c:719
dput+0x18a/0x2b0 fs/dcache.c:909
__fput+0x68e/0xa70 fs/file_table.c:473
task_work_run+0x1d1/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6ad/0x22e0 kernel/exit.c:955
do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd51a58e929
Code: Unable to access opcode bytes at 0x7fd51a58e8ff.
RSP: 002b:00007fd51b453038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 000000000000fe33 RBX: 00007fd51a7b5fa0 RCX: 00007fd51a58e929
RDX: 000000000000fe33 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fd51a610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd51a7b5fa0 R15: 00007ffe327ec2c8
----------------
Code disassembly (best guess):
0: 8b 44 24 40 mov 0x40(%rsp),%eax
4: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax
9: 84 c0 test %al,%al
b: 0f 85 42 01 00 00 jne 0x153
11: c6 07 00 movb $0x0,(%rdi)
14: 43 0f b6 04 37 movzbl (%r15,%r14,1),%eax
19: 84 c0 test %al,%al
1b: 0f 85 60 01 00 00 jne 0x181
21: c6 01 01 movb $0x1,(%rcx)
24: 41 be 00 80 ff ff mov $0xffff8000,%r14d
* 2a: 66 c7 84 24 90 00 00 movw $0x100,0x90(%rsp) <-- trapping instruction
31: 00 00 01
34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
3b: fc ff df
3e: 48 rex.W
3f: 8b .byte 0x8b