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WARNING: CPU: 1 PID: 16891 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 1 PID: 16891 Comm: syz.5.3280 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 84 30 97 be 04 00 00 00 e8 2a cc 6d 00 48 89 df b8 01 00 00 00 87 05 2c 12 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 00 72 13 8d 74 47 48 c7 c0 ac 12 8b 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d137200 RCX: ffffffff81717266
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d137200
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e61094 R12: 0000000000002904
R13: ffffffff8d137200 R14: 0000000000000a02 R15: dffffc0000000000
FS: 00007fa6d41716c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 000000007e6e5000 CR4: 00000000003506e0
Call Trace:
rcu_core+0x635/0x1770 kernel/rcu/tree.c:2462
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 90 20 09 f7 e8 4b 20 09 f7 fb 65 48 8b 05 92 52 7f 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 0d 67 ef f6 48
RSP: 0018:ffffc900035a7f08 EFLAGS: 00000286
RAX: ffff88807650da00 RBX: 000000000000000f RCX: 506c17d5a3261600
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: ffffffff8b1c81e0
RBP: ffffc900035a7f48 R08: ffffffff8e8addef R09: 1ffffffff1d15bbd
R10: dffffc0000000000 R11: fffffbfff1d15bbe R12: 0000000000000000
R13: 0000000000000000 R14: ffffc900035a7f58 R15: 0000000000000000
do_syscall_64+0x28/0xa0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa6d333d399
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007fa6d4170b40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fa6d3615fa8 RCX: 00007fa6d333d399
RDX: 00007fa6d4170b40 RSI: 00007fa6d4170c70 RDI: 0000000000000021
RBP: 00007fa6d3615fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fa6d3616038 R14: 00007ffcb39c0ca0 R15: 00007ffcb39c0d88
----------------
Code disassembly (best guess):
0: 41 56 push %r14
2: 53 push %rbx
3: 48 89 f3 mov %rsi,%rbx
6: 49 89 fe mov %rdi,%r14
9: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
e: e8 e9 fa ff ff call 0xfffffafc
13: 66 90 xchg %ax,%ax
15: 66 90 xchg %ax,%ax
17: e8 90 20 09 f7 call 0xf70920ac
1c: e8 4b 20 09 f7 call 0xf709206c
21: fb sti
22: 65 48 8b 05 92 52 7f mov %gs:0x757f5292(%rip),%rax # 0x757f52bc
29: 75
* 2a: 48 8b 70 08 mov 0x8(%rax),%rsi <-- trapping instruction
2e: 40 f6 c6 3f test $0x3f,%sil
32: 74 0b je 0x3f
34: 4c 89 f7 mov %r14,%rdi
37: 5b pop %rbx
38: 41 5e pop %r14
3a: e9 0d 67 ef f6 jmp 0xf6ef674c
3f: 48 rex.W