syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=03a/1/0x4000000000000002 softirq=37537/37538 fqs=5216 rcu: (t=10500 jiffies g=54029 q=1738) NMI backtrace for cpu 1 CPU: 1 PID: 19935 Comm: syz-executor0 Not tainted 4.19.0-rc8-next-20181019+ #98 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:162 [inline] rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree.c:1195 print_cpu_stall.cold.67+0x1f3/0x3c7 kernel/rcu/tree.c:1334 check_cpu_stall kernel/rcu/tree.c:1408 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xf3b/0x13f0 kernel/rcu/tree.c:2506 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x412/0x10c0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 RIP: 0010:rcu_lockdep_current_cpu_online+0x16/0x210 kernel/rcu/tree.c:946 Code: 00 5d c3 e8 5c f9 58 00 eb 8f e8 55 f9 58 00 eb ce 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 49 bd 00 00 00 00 00 fc ff df 41 54 <53> 48 8d 9d 78 ff ff ff 48 c1 eb 03 48 83 ec 68 48 c7 45 80 b5 a1 RSP: 0018:ffff88017deee560 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff88017deee7c0 RCX: 1ffff1002fbddca2 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88017deee510 RBP: ffff88017deee580 R08: ffffed003b5e5b50 R09: ffffed003b5e5b4f R10: ffffed003b5e5b4f R11: ffff8801daf2da7b R12: 1ffff1002fbddcb6 R13: dffffc0000000000 R14: ffff8801c52d8cc2 R15: ffff88017deee7d8 rcu_read_lock_held+0x90/0xc0 kernel/rcu/update.c:279 xa_head include/linux/xarray.h:539 [inline] xas_start+0x2f7/0x740 lib/xarray.c:182 xas_load+0x21/0x1e0 lib/xarray.c:227 find_get_entry+0x3ca/0x1120 mm/filemap.c:1415 pagecache_get_page+0x12f/0xf00 mm/filemap.c:1518 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1029 [inline] __getblk_slow fs/buffer.c:1062 [inline] __getblk_gfp+0x4ca/0x1030 fs/buffer.c:1351 __bread_gfp+0x2d/0x310 fs/buffer.c:1385 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x33b/0x1570 fs/fat/dir.c:479 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697 vfat_lookup+0x107/0x640 fs/fat/namei_vfat.c:711 lookup_open+0x72e/0x1b90 fs/namei.c:3213 do_last fs/namei.c:3324 [inline] path_openat+0x15e4/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 ksys_open include/linux/syscalls.h:1292 [inline] __do_sys_creat fs/open.c:1121 [inline] __se_sys_creat fs/open.c:1119 [inline] __x64_sys_creat+0x61/0x80 fs/open.c:1119 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f992bd78c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f992bd796d4 R13: 00000000004bdb2f R14: 00000000004cc688 R15: 00000000ffffffff syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(19935): getblk(): executed=9 bh_count=0 bh_state=0