syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=c86/1/0x4000000000000002 softirq=145563/145564 fqs=4506 rcu: (t=10500 jiffies g=239049 q=1707) NMI backtrace for cpu 0 CPU: 0 PID: 27910 Comm: syz-executor0 Not tainted 4.20.0-rc1-next-20181109+ #110 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:1211 print_cpu_stall.cold.70+0x218/0x40a kernel/rcu/tree.c:1348 check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xf3b/0x13f0 kernel/rcu/tree.c:2521 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:__sanitizer_cov_trace_pc+0x2b/0x50 kernel/kcov.c:101 Code: 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 08 45 82 7e 81 e2 00 01 1f 00 75 2b 8b 90 d8 12 00 00 83 fa 02 75 20 <48> 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 83 c2 01 48 39 RSP: 0018:ffff88018f816560 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8801c5f58100 RBX: 0000000000000001 RCX: ffffffff819d6113 RDX: 0000000000000002 RSI: ffffffff819d612f RDI: 0000000000000005 RBP: ffff88018f816560 R08: ffff8801c5f58100 R09: fffff94000a99a5e R10: fffff94000a99a5e R11: ffffea00054cd2f7 R12: ffff88018f816900 R13: 1ffff10031f02cd0 R14: ffffed0031f02cbc R15: dffffc0000000000 atomic_fetch_add_unless include/linux/atomic-fallback.h:1091 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] page_ref_add_unless include/linux/page_ref.h:157 [inline] get_page_unless_zero include/linux/mm.h:531 [inline] page_cache_get_speculative include/linux/pagemap.h:186 [inline] find_get_entry+0x59f/0x1120 mm/filemap.c:1426 pagecache_get_page+0x12f/0xf00 mm/filemap.c:1518 find_get_page_flags include/linux/pagemap.h:278 [inline] __find_get_block_slow fs/buffer.c:205 [inline] __find_get_block+0x635/0xf10 fs/buffer.c:1325 __getblk_slow fs/buffer.c:1058 [inline] __getblk_gfp+0x3d3/0x1030 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:00007fb432908c78 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: 00007fb4329096d4 R13: 00000000004bdbef R14: 00000000004cd070 R15: 00000000ffffffff sched: RT throttling activated syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(27910): getblk(): executed=9 bh_count=0 bh_state=0 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!