------------[ cut here ]------------
WARNING: CPU: 0 PID: 8831 at kernel/rcu/tree_stall.h:970 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:962
Modules linked in:
CPU: 0 PID: 8831 Comm: syz.4.1491 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:970
Code: ff ff ff 48 c7 c7 20 ff c3 96 be 04 00 00 00 e8 3a 56 66 00 48 89 df b8 01 00 00 00 87 05 4c f4 56 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 2b b3 8c 74 47 48 c7 c0 24 00 20 8e 48 c1 e8 03
RSP: 0018:ffffc90000007b78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cb32b80 RCX: ffffffff816d0ac6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cb32b80
RBP: ffffc90000007df0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2d87fe4 R12: 0000000000002904
R13: dffffc0000000000 R14: 0000000000000a06 R15: dffffc0000000000
FS: 00007faca7b0b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35959d CR3: 000000007cbb2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_core+0x60b/0x1740 kernel/rcu/tree.c:2552
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 14 42 5c f7 e8 8f 40 5c f7 fb 65 48 8b 05 36 d3 d5 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 91 a1 42 f7 48
RSP: 0018:ffffc90003307f08 EFLAGS: 00000286
RAX: ffff888077803b80 RBX: 000000000000000f RCX: b11b156ee47c1200
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0d20
RBP: ffffc90003307f48 R08: ffffffff8e1fcb6f R09: 1ffffffff1c3f96d
R10: dffffc0000000000 R11: fffffbfff1c3f96e R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003307f58 R15: 0000000000000000
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faca6b3c399
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:00007faca7b0aa80 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007faca6e15fa0 RCX: 00007faca6b3c399
RDX: 00007faca7b0aa80 RSI: 00007faca7b0abb0 RDI: 0000000000000011
RBP: 00007faca6c316e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faca6e16038 R14: 00007faca6e15fa0 R15: 00007ffe5d0a1ce8
----------------
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 ed fa ff ff call 0xfffffb00
13: 66 90 xchg %ax,%ax
15: 66 90 xchg %ax,%ax
17: e8 14 42 5c f7 call 0xf75c4230
1c: e8 8f 40 5c f7 call 0xf75c40b0
21: fb sti
22: 65 48 8b 05 36 d3 d5 mov %gs:0x75d5d336(%rip),%rax # 0x75d5d360
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 91 a1 42 f7 jmp 0xf742a1d0
3f: 48 rex.W