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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049, CPU#0: syz.0.3003/18411
Modules linked in:
CPU: 0 UID: 0 PID: 18411 Comm: syz.0.3003 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049
Code: ff ff 48 c7 c7 a0 45 02 9a be 04 00 00 00 e8 a3 89 82 00 4c 89 f7 b8 01 00 00 00 87 05 05 09 58 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 05 56 8e 74 47 48 c7 c0 a0 4a ef 8f 48 c1 e8
RSP: 0018:ffffc90000007d98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff81aa3c8d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e560500
RBP: ffffc90000007f30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff34048b4 R12: 0000000000002904
R13: 1ffff110170c771a R14: ffffffff8e560500 R15: dffffc0000000000
FS: 00007f116a7866c0(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c7314da08 CR3: 000000003187c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_core+0x5f1/0x1750 kernel/rcu/tree.c:2852
handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7194
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 b3 9c fa f5 e8 ae 30 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 34 32 34 f6 bf 01
RSP: 0018:ffffc9000bdf6a70 EFLAGS: 00000206
RAX: 0000000000004635 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dcc9112 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e
R10: dffffc0000000000 R11: fffffbfff1fde34f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
irqentry_exit+0x597/0x620 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3a0 kernel/locking/lockdep.c:5879
Code: 8b 05 60 32 52 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 63 32 52 11 83 f8 08 0f 83 56 02 00 00 89 c0 48 0f a3 05 8c 9c 4e 0e <73> 0d e8 b5 2c 09 00 84 c0 0f 84 94 02 00 00 83 3d a6 cc 4e 0e 00
RSP: 0018:ffffc9000bdf6b90 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff908a8901 RCX: 0000000080000001
RDX: ffffc9000bdf6d01 RSI: ffffffff81759195 RDI: ffffffff8e55a360
RBP: dffffc0000000000 R08: ffffc9000bdf7d10 R09: 0000000000000000
R10: ffffc9000bdf6d18 R11: fffff520017beda5 R12: ffffc9000bdf7d20
R13: ffffffff81759195 R14: ffffffff8e55a360 R15: ffffffff81759195
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695
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:5657 [inline]
__kmalloc_node_track_caller_noprof+0x558/0x7f0 mm/slub.c:5768
__do_krealloc mm/slub.c:7018 [inline]
krealloc_node_align_noprof+0x1ae/0x390 mm/slub.c:7077
copy_array+0x71/0x100 kernel/bpf/verifier.c:1391
copy_verifier_state+0xaf/0xf90 kernel/bpf/verifier.c:1741
is_state_visited kernel/bpf/verifier.c:20046 [inline]
do_check+0x53e3/0xf260 kernel/bpf/verifier.c:20516
do_check_common+0x19cc/0x25b0 kernel/bpf/verifier.c:23870
do_check_main kernel/bpf/verifier.c:23953 [inline]
bpf_check+0x5f3d/0x1c4c0 kernel/bpf/verifier.c:25260
bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3088
__sys_bpf+0x570/0x920 kernel/bpf/syscall.c:6164
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f116999aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f116a786028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1169c15fa0 RCX: 00007f116999aeb9
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f1169a08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1169c16038 R14: 00007f1169c15fa0 R15: 00007ffc2a81de58
----------------
Code disassembly (best guess):
0: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
7: fc ff df
a: eb 09 jmp 0x15
c: 48 f7 03 10 00 00 00 testq $0x10,(%rbx)
13: 74 53 je 0x68
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 b3 9c fa f5 call 0xf5fa9cd2
1f: e8 ae 30 34 f6 call 0xf63430d2
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 43 a9 ff ff call 0xffffa972 <-- trapping instruction
2f: 9c pushf
30: 58 pop %rax
31: fa cli
32: a9 00 02 00 00 test $0x200,%eax
37: 74 05 je 0x3e
39: e8 34 32 34 f6 call 0xf6343272
3e: bf .byte 0xbf
3f: 01 .byte 0x1