b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 INFO: task syz-executor1:14319 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 Not tainted 5.0.0-rc2+ #29 device loop1 blocksize: 4096 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 syz-executor1 D22552 14319 8582 0x00000004 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 schedule+0xfe/0x350 kernel/sched/core.c:3516 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 lock_fat fs/fat/fatent.c:279 [inline] fat_count_free_clusters+0x11b/0xe50 fs/fat/fatent.c:656 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 fat_statfs+0x3b0/0x4c0 fs/fat/inode.c:822 statfs_by_dentry fs/statfs.c:64 [inline] statfs_by_dentry+0x13d/0x220 fs/statfs.c:53 vfs_statfs+0x47/0x2d0 fs/statfs.c:74 fd_statfs+0x4b/0x90 fs/statfs.c:104 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 __do_sys_fstatfs+0x88/0x100 fs/statfs.c:200 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 __se_sys_fstatfs fs/statfs.c:197 [inline] __x64_sys_fstatfs+0x54/0x80 fs/statfs.c:197 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 entry_SYSCALL_64_after_hwframe+0x49/0xbe __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007f62e1f96c78 EFLAGS: 00000246 ORIG_RAX: 000000000000008a b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 __find_get_block_slow() failed. block=1, b_blocknr=8 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 000000000000000d RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f62e1f976d4 __find_get_block_slow() failed. block=1, b_blocknr=8 R13: 00000000004be73e R14: 00000000004cf048 R15: 00000000ffffffff b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 Showing all locks held in the system: b_state=0x00000021, b_size=512 6 locks held by kworker/u4:0/7: device loop1 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 1 lock held by khungtaskd/1040: #0: 00000000336a9eed (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 1 lock held by rsyslogd/8418: #0: 00000000a6481e13 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 2 locks held by getty/8540: device loop1 blocksize: 4096 #0: 000000008f9526b9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 #1: 00000000ff806cfc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/8541: b_state=0x00000021, b_size=512 #0: 00000000ad2e4514 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 device loop1 blocksize: 4096 #1: 00000000c1620201 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8542: #0: 0000000079c3de7a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000063708a6c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8543: #0: 00000000645dc156 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 00000000eec3ce1a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 2 locks held by getty/8544: device loop1 blocksize: 4096 #0: 00000000f443716e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000072db3c98 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8545: #0: 00000000670ea216 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000dfc61f57 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 2 locks held by getty/8546: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 #0: 00000000e179fe7d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004d507e1d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 2 locks held by syz-executor1/14314: 1 lock held by syz-executor1/14319: #0: 00000000ebbd337b (&sbi->fat_lock){+.+.}, at: lock_fat fs/fat/fatent.c:279 [inline] #0: 00000000ebbd337b (&sbi->fat_lock){+.+.}, at: fat_count_free_clusters+0x11b/0xe50 fs/fat/fatent.c:656 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 ============================================= device loop1 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc2+ #29 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+0x1db/0x2d0 lib/dump_stack.c:113 __find_get_block_slow() failed. block=1, b_blocknr=8 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 b_state=0x00000021, b_size=512 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 device loop1 blocksize: 4096 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xbbb/0x1170 kernel/hung_task.c:287 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop1 blocksize: 4096 kthread+0x357/0x430 kernel/kthread.c:246 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: device loop1 blocksize: 4096 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.519 msecs NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.0.0-rc2+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:1) RIP: 0010:mark_held_locks+0xb/0x100 kernel/locking/lockdep.c:2723 Code: e8 1a 10 62 00 4c 8b 95 50 ff ff ff e9 6d e9 ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 <48> 89 e5 41 57 41 56 49 89 fe 48 81 c7 78 08 00 00 48 89 fa 41 55 RSP: 0018:ffff8880ae607858 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8880a944e1c0 RCX: 0000000000000000 RDX: 1ffff11015289d41 RSI: 0000000000000000 RDI: ffff8880a944e1c0 RBP: ffff8880ae607878 R08: ffff8880a944e1c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87f4356b R13: 0000000000000286 R14: ffffffff87f4356b R15: ffff8880ae623bc0 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe240035b0 CR3: 00000000a3e94000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: trace_hardirqs_on+0xbd/0x310 kernel/trace/trace_preemptirq.c:30 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x6b/0xe0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] skb_dequeue+0x12e/0x180 net/core/skbuff.c:2865 garp_queue_xmit net/802/garp.c:261 [inline] garp_join_timer+0x5e/0x80 net/802/garp.c:413 call_timer_fn+0x254/0x900 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1697 [inline] RIP: 0010:vprintk_emit+0x84c/0x960 kernel/printk/printk.c:1930 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ef 00 00 00 48 83 3d c4 54 2a 08 00 74 2d e8 fd d2 19 00 48 8b bd 10 ff ff ff 57 9d <0f> 1f 44 00 00 e9 a3 fe ff ff e8 e5 d2 19 00 0f 0b e8 de d2 19 00 RSP: 0018:ffff8880a945e828 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a944e1c0 RBX: 1ffff1101528bd0b RCX: 1ffff11015289d5b RDX: 0000000000000000 RSI: ffffffff81682bf3 RDI: 0000000000000293 RBP: ffff8880a945e920 R08: 0000000000000006 R09: ffff8880a944ead8 R10: ffff8880a944e1c0 R11: 0000000000000000 R12: 0000000000000200 R13: ffffed101528bd15 R14: 0000000000000000 R15: ffff8880a945e8f8 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 __find_get_block_slow fs/buffer.c:237 [inline] __find_get_block fs/buffer.c:1294 [inline] __find_get_block.cold+0xd4/0xfb fs/buffer.c:1288 __getblk_slow fs/buffer.c:1039 [inline] __getblk_gfp+0x295/0xd20 fs/buffer.c:1320 __bread_gfp+0x2f/0x300 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] __fat_write_inode+0x33a/0xb70 fs/fat/inode.c:859 fat_write_inode+0x96/0x190 fs/fat/inode.c:908 write_inode fs/fs-writeback.c:1176 [inline] __writeback_single_inode+0xef1/0x1620 fs/fs-writeback.c:1375 writeback_sb_inodes+0x762/0x1260 fs/fs-writeback.c:1580 __writeback_inodes_wb+0x16d/0x3d0 fs/fs-writeback.c:1649 wb_writeback+0xa2d/0xf70 fs/fs-writeback.c:1758 wb_check_old_data_flush fs/fs-writeback.c:1860 [inline] wb_do_writeback fs/fs-writeback.c:1913 [inline] wb_workfn+0xf7f/0x16f0 fs/fs-writeback.c:1942 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352