__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 INFO: task syz-executor4:6148 blocked for more than 140 seconds. device loop4 blocksize: 4096 Not tainted 4.20.0-rc4+ #353 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 syz-executor4 D17752 6148 1 0x00000004 b_state=0x00000029, b_size=512 Call Trace: device loop4 blocksize: 4096 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 schedule+0xfe/0x460 kernel/sched/core.c:3516 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 wb_wait_for_completion+0x1f9/0x2d0 fs/fs-writeback.c:221 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 __writeback_inodes_sb_nr+0x405/0x580 fs/fs-writeback.c:2333 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 writeback_inodes_sb_nr fs/fs-writeback.c:2350 [inline] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2365 device loop4 blocksize: 4096 __sync_filesystem fs/sync.c:36 [inline] sync_filesystem+0x16f/0x330 fs/sync.c:64 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 generic_shutdown_super+0xdd/0x530 fs/super.c:442 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 kill_block_super+0x9e/0x100 fs/super.c:1185 device loop4 blocksize: 4096 deactivate_locked_super+0x97/0x100 fs/super.c:329 __find_get_block_slow() failed. block=1, b_blocknr=8 deactivate_super+0x2bb/0x320 fs/super.c:360 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 cleanup_mnt+0xbf/0x160 fs/namespace.c:1098 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __cleanup_mnt+0x16/0x20 fs/namespace.c:1105 __find_get_block_slow() failed. block=1, b_blocknr=8 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 entry_SYSCALL_64_after_hwframe+0x49/0xbe device loop4 blocksize: 4096 RIP: 0033:0x459fb7 __find_get_block_slow() failed. block=1, b_blocknr=8 Code: Bad RIP value. b_state=0x00000029, b_size=512 RSP: 002b:00007ffe098c6e18 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 device loop4 blocksize: 4096 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000459fb7 __find_get_block_slow() failed. block=1, b_blocknr=8 RDX: 0000000000402e70 RSI: 0000000000000002 RDI: 00007ffe098c6ec0 b_state=0x00000029, b_size=512 RBP: 000000000000129a R08: 0000000000000000 R09: 000000000000000c device loop4 blocksize: 4096 R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffe098c7f50 __find_get_block_slow() failed. block=1, b_blocknr=8 R13: 0000000000f21940 R14: 0000000000000000 R15: 0000000000000004 b_state=0x00000029, b_size=512 Showing all locks held in the system: device loop4 blocksize: 4096 1 lock held by khungtaskd/1020: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000004130044d (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 b_state=0x00000029, b_size=512 1 lock held by rsyslogd/5908: device loop4 blocksize: 4096 #0: 00000000b46ef712 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/5999: b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000003f2ebdf3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000029, b_size=512 #1: 00000000479dcdb1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6000: b_state=0x00000029, b_size=512 #0: 000000000c5d39bb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop4 blocksize: 4096 #1: 00000000357333d0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6001: b_state=0x00000029, b_size=512 #0: 000000006f1f202b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop4 blocksize: 4096 #1: 00000000ceae0872 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6002: b_state=0x00000029, b_size=512 #0: 00000000856bf34f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop4 blocksize: 4096 #1: 00000000df1a7a6a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6003: b_state=0x00000029, b_size=512 #0: 000000000933cf27 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop4 blocksize: 4096 #1: 00000000750ef8ff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6004: b_state=0x00000029, b_size=512 #0: 00000000480bdfce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop4 blocksize: 4096 #1: 000000002840fcd7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6005: b_state=0x00000029, b_size=512 #0: 00000000dfec29bb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ace41609 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 device loop4 blocksize: 4096 1 lock held by syz-executor4/6148: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000d3ffbbe4 (&type->s_umount_key#77){++++}, at: deactivate_super+0x2b3/0x320 fs/super.c:359 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 6 locks held by kworker/u4:5/10587: b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 ============================================= b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 1 b_state=0x00000029, b_size=512 CPU: 1 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc4+ #353 device loop4 blocksize: 4096 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 b_state=0x00000029, b_size=512 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 device loop4 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:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop4 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 device loop4 blocksize: 4096 Sending NMI from CPU 1 to CPUs 0: __find_get_block_slow() failed. block=1, b_blocknr=8 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.484 msecs NMI backtrace for cpu 0 CPU: 0 PID: 10587 Comm: kworker/u4:5 Not tainted 4.20.0-rc4+ #353 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:4) RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:lock_release+0xf2/0xa00 kernel/locking/lockdep.c:3859 Code: 00 45 8b 84 24 7c 08 00 00 45 85 c0 0f 85 48 04 00 00 48 c7 c7 68 fb 51 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 73 07 00 00 48 83 3d c4 2a f0 07 00 0f 84 1b 06 RSP: 0018:ffff8881dae07b90 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 1ffff1103b5c0f77 RCX: 0000000000000000 RDX: 1ffffffff12a3f6d RSI: 0000000000000001 RDI: ffffffff8951fb68 RBP: ffff8881dae07cc0 R08: 0000000000000000 R09: 0000000000000008 R10: 0000000000000863 R11: ffff8881ced5a040 R12: ffff8881ced5a040 R13: ffff8881dae07c98 R14: ffff8881dae07db0 R15: ffff8881dae25d84 FS: 0000000000000000(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c2e4e000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:82 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get_update_offsets_now+0x15a/0x540 kernel/time/timekeeping.c:2223 hrtimer_update_base kernel/time/hrtimer.c:587 [inline] hrtimer_interrupt+0x137/0x780 kernel/time/hrtimer.c:1500 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1688 [inline] RIP: 0010:vprintk_emit+0x87d/0x990 kernel/printk/printk.c:1921 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 de 00 00 00 48 83 3d 53 38 ec 07 00 74 34 e8 dc c7 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 aa fe ff ff e8 c4 c7 19 00 0f 0b e8 bd c7 19 00 RSP: 0018:ffff88817bd4e088 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881ced5a040 RBX: 1ffff1102f7a9c17 RCX: 1ffff11039dab526 RDX: 0000000000000000 RSI: ffffffff8165c324 RDI: 0000000000000293 RBP: ffff88817bd4e200 R08: ffff8881ced5a930 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881ced5a040 R12: 0000000000000200 R13: 0000000000000000 R14: ffffed102f7a9c2b R15: ffff88817bd4e1d8 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 __find_get_block_slow fs/buffer.c:231 [inline] __find_get_block.cold.57+0x3a/0xff fs/buffer.c:1294 __getblk_slow fs/buffer.c:1039 [inline] __getblk_gfp+0x2b3/0xd50 fs/buffer.c:1320 __bread_gfp+0x2d/0x310 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] __fat_write_inode+0x347/0xb60 fs/fat/inode.c:859 fat_write_inode+0x97/0x180 fs/fat/inode.c:908 write_inode fs/fs-writeback.c:1176 [inline] __writeback_single_inode+0xf56/0x1660 fs/fs-writeback.c:1375 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580 wb_writeback+0x48c/0xfc0 fs/fs-writeback.c:1756 wb_do_writeback fs/fs-writeback.c:1901 [inline] wb_workfn+0x495/0x1790 fs/fs-writeback.c:1942 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352