rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=111/1/0x4000000000000000 softirq=89324/89324 fqs=5138 (t=10500 jiffies g=175697 q=40306) NMI backtrace for cpu 0 CPU: 0 PID: 31091 Comm: syz-executor.2 Not tainted 5.15.0-rc5-next-20211018-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:604 [inline] check_cpu_stall kernel/rcu/tree_stall.h:688 [inline] rcu_pending kernel/rcu/tree.c:3889 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608 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:ntfs_collate_names+0x285/0x3d0 fs/ntfs/unistr.c:112 Code: 44 8b 74 24 18 8b 5c 24 14 44 89 f6 89 df e8 42 84 e5 fe 44 39 f3 72 c6 e8 38 81 e5 fe 44 89 f6 89 df 45 31 ed e8 2b 84 e5 fe <44> 39 f3 74 b5 e8 21 81 e5 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc90004c17930 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888080298000 RDI: 0000000000000003 RBP: ffff888054d35ac2 R08: 0000000000000008 R09: 0000000000000001 R10: ffffffff8291f3e5 R11: 0000000000000000 R12: ffffffff89df4840 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000008 ntfs_lookup_inode_by_name+0x62d/0x34b0 fs/ntfs/dir.c:234 load_and_init_usnjrnl+0xda/0x1180 fs/ntfs/super.c:1450 load_system_files fs/ntfs/super.c:2146 [inline] ntfs_fill_super+0x7425/0x84a0 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: 0033:0x7f2985d98f6a 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:00007f298330cfa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f2985d98f6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f298330d000 RBP: 00007f298330d040 R08: 00007f298330d040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f298330d000 R15: 0000000020086e00 ---------------- Code disassembly (best guess): 0: 44 8b 74 24 18 mov 0x18(%rsp),%r14d 5: 8b 5c 24 14 mov 0x14(%rsp),%ebx 9: 44 89 f6 mov %r14d,%esi c: 89 df mov %ebx,%edi e: e8 42 84 e5 fe callq 0xfee58455 13: 44 39 f3 cmp %r14d,%ebx 16: 72 c6 jb 0xffffffde 18: e8 38 81 e5 fe callq 0xfee58155 1d: 44 89 f6 mov %r14d,%esi 20: 89 df mov %ebx,%edi 22: 45 31 ed xor %r13d,%r13d 25: e8 2b 84 e5 fe callq 0xfee58455 * 2a: 44 39 f3 cmp %r14d,%ebx <-- trapping instruction 2d: 74 b5 je 0xffffffe4 2f: e8 21 81 e5 fe callq 0xfee58155 34: 4c 89 e2 mov %r12,%rdx 37: 48 rex.W 38: b8 00 00 00 00 mov $0x0,%eax 3d: 00 fc add %bh,%ah 3f: ff .byte 0xff