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1
WARNING: kernel/rcu/tree_stall.h:1048 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1048, CPU#1: syz.2.3321/18827
Modules linked in:
CPU: 1 UID: 0 PID: 18827 Comm: syz.2.3321 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1048
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 80 e5 1f 9b e8 00 15 8c 00 b8 01 00 00 00 87 05 f5 24 32 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 64 52 da 90 48 81 fd 80 13 7f 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000a08df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81edc080
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9b1fe580
RBP: ffffffff8e7f1380 R08: 0000000000000001 R09: fffffbfff363fcb0
R10: 0000000000000003 R11: 0000000000000000 R12: 1ffffffff1c81e50
R13: 0000000000000246 R14: 0000000000000080 R15: 0000000000000001
FS:  00007f4bddff66c0(0000) GS:ffff88812441a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000047abf000 CR4: 00000000003526f0
DR0: 0000000000000101 DR1: 0000000000000007 DR2: 000000000000000f
DR3: 0000000000000006 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1011 [inline]
 rcu_core+0x2cb/0x10d0 kernel/rcu/tree.c:2892
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0x54/0x70 kernel/kcov.c:222
Code: e9 51 82 90 09 8b 82 1c 17 00 00 85 c0 74 f1 8b 82 f8 16 00 00 83 f8 02 75 e6 48 8b 8a 00 17 00 00 8b 92 fc 16 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 cd 48 89 01 48 89 34 c1 e9 17 82 90 09 0f
RSP: 0018:ffffc900034afb38 EFLAGS: 00000246
RAX: 000000000007ffff RBX: 0000000000000000 RCX: ffffc90010409000
RDX: 0000000000080000 RSI: ffffffff81fcc967 RDI: ffff888034fcca80
RBP: ffff8880b8443500 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffffffffffff R12: 0000000000000003
R13: ffffed10170886a1 R14: 0000000000000001 R15: ffff8880b853c700
 native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
 cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0x587/0x16c0 kernel/smp.c:892
 clock_was_set+0x61c/0x850 kernel/time/hrtimer.c:999
 do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1684
 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
 __do_sys_clock_settime kernel/time/posix-timers.c:1139 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1123 [inline]
 __x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1123
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4bdfd9ce59
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:00007f4bddff6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f4be0016090 RCX: 00007f4bdfd9ce59
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000000
RBP: 00007f4bdfe32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4be0016128 R14: 00007f4be0016090 R15: 00007ffe6c4529a8
 </TASK>
----------------
Code disassembly (best guess):
   0:	e9 51 82 90 09       	jmp    0x9908256
   5:	8b 82 1c 17 00 00    	mov    0x171c(%rdx),%eax
   b:	85 c0                	test   %eax,%eax
   d:	74 f1                	je     0x0
   f:	8b 82 f8 16 00 00    	mov    0x16f8(%rdx),%eax
  15:	83 f8 02             	cmp    $0x2,%eax
  18:	75 e6                	jne    0x0
  1a:	48 8b 8a 00 17 00 00 	mov    0x1700(%rdx),%rcx
  21:	8b 92 fc 16 00 00    	mov    0x16fc(%rdx),%edx
  27:	48 8b 01             	mov    (%rcx),%rax
* 2a:	48 83 c0 01          	add    $0x1,%rax <-- trapping instruction
  2e:	48 39 d0             	cmp    %rdx,%rax
  31:	73 cd                	jae    0x0
  33:	48 89 01             	mov    %rax,(%rcx)
  36:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  3a:	e9 17 82 90 09       	jmp    0x9908256
  3f:	0f                   	.byte 0xf