rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=d2b/1/0x4000000000000000 softirq=32526/32527 fqs=5248 (t=10502 jiffies g=50669 q=831) NMI backtrace for cpu 1 CPU: 1 PID: 19862 Comm: syz-executor.3 Not tainted 5.15.0-rc2-next-20210924-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode+0x7/0x40 kernel/kcov.c:163 Code: 00 e9 59 fe ff ff 48 8b 7c 24 08 e8 33 43 46 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 09 37 8c 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b RSP: 0018:ffffc90005bcf990 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888084505700 RDX: 0000000000000000 RSI: ffff888084505700 RDI: 0000000000000003 RBP: ffffc90005c81000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff828c8c2c R11: 0000000000000000 R12: ffff888048b3c600 R13: ffff888078da5800 R14: dffffc0000000000 R15: ffff888048b3c650 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp2+0x22/0x80 kernel/kcov.c:277 ntfs_lookup_inode_by_name+0x178c/0x34b0 fs/ntfs/dir.c:394 check_windows_hibernation_status+0xd9/0x740 fs/ntfs/super.c:1274 load_system_files fs/ntfs/super.c:1989 [inline] ntfs_fill_super+0x62f4/0x84e0 fs/ntfs/super.c:2893 mount_bdev+0x34d/0x410 fs/super.c:1368 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount fs/namespace.c:3516 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb33a1a5c2a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb33771afa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fb33a1a5c2a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fb33771b000 RBP: 00007fb33771b040 R08: 00007fb33771b040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fb33771b000 R15: 0000000020086e00 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 59 fe ff ff jmpq 0xfffffe5e 5: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi a: e8 33 43 46 00 callq 0x464342 f: e9 61 fd ff ff jmpq 0xfffffd75 14: cc int3 15: cc int3 16: cc int3 17: cc int3 18: cc int3 19: cc int3 1a: cc int3 1b: cc int3 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: 65 8b 05 09 37 8c 7e mov %gs:0x7e8c3709(%rip),%eax # 0x7e8c3732 * 29: 89 c2 mov %eax,%edx <-- trapping instruction 2b: 81 e2 00 01 00 00 and $0x100,%edx 31: a9 00 01 ff 00 test $0xff0100,%eax 36: 74 10 je 0x48 38: 31 c0 xor %eax,%eax 3a: 85 d2 test %edx,%edx 3c: 74 15 je 0x53 3e: 8b .byte 0x8b