syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=48e/1/0x4000000000000002 softirq=24318/24319 fqs=4799 rcu: (t=10502 jiffies g=31489 q=1087) NMI backtrace for cpu 0 CPU: 0 PID: 13498 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:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:101 Code: 4c d8 20 4c 89 08 5d c3 66 90 55 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 RSP: 0018:ffff880196d662c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8801ce7c82c0 RBX: ffffea0006da2100 RCX: ffffffff81a5244c RDX: 0000000000000000 RSI: ffffffff81a52468 RDI: 0000000000000007 RBP: ffff880196d662c8 R08: ffff8801ce7c82c0 R09: ffffed003b5c5b67 R10: 0000000000000005 R11: ffff8801dae2db3b R12: ffff880196d667d0 R13: ffffea0006da2108 R14: 1ffff10032dacc5e R15: ffffea0006da2100 constant_test_bit arch/x86/include/asm/bitops.h:325 [inline] PageActive include/linux/page-flags.h:290 [inline] mark_page_accessed+0x388/0x2040 mm/swap.c:379 pagecache_get_page+0x7cd/0xf00 mm/filemap.c:1544 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_ent_bread+0x173/0x290 fs/fat/fatent.c:107 fat_ent_read_block fs/fat/fatent.c:442 [inline] fat_alloc_clusters+0x8db/0x16f0 fs/fat/fatent.c:490 fat_add_cluster+0x84/0x160 fs/fat/inode.c:101 __fat_get_block fs/fat/inode.c:148 [inline] fat_get_block+0x385/0xb30 fs/fat/inode.c:183 __block_write_begin_int+0x5ef/0x1d90 fs/buffer.c:1997 __block_write_begin fs/buffer.c:2047 [inline] block_write_begin+0xda/0x370 fs/buffer.c:2106 cont_write_begin+0x5ba/0x920 fs/buffer.c:2459 fat_write_begin+0x8d/0x120 fs/fat/inode.c:229 generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3140 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3265 generic_file_write_iter+0x34d/0x6b0 mm/filemap.c:3293 call_write_iter include/linux/fs.h:1867 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 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:00007f99bfbd5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 00000000fffffd97 RSI: 0000000020000180 RDI: 0000000000000008 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f99bfbd66d4 R13: 00000000004c5893 R14: 00000000004d95a0 R15: 00000000ffffffff sched: RT throttling activated syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(13498): getblk(): executed=9 bh_count=0 bh_state=0