b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 INFO: task syz-executor5:24744 blocked for more than 120 seconds. __find_get_block_slow() failed. block=3, b_blocknr=1 Not tainted 4.17.0-rc3+ #33 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. b_state=0x00000029, b_size=4096 syz-executor5 D23552 24744 20770 0x00000004 device loop0 blocksize: 2048 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 schedule+0xef/0x430 kernel/sched/core.c:3549 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x400/0x6e0 kernel/locking/rwsem-xadd.c:286 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0xbd/0x1b0 kernel/locking/rwsem.c:26 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 __get_super.part.12+0x20f/0x2e0 fs/super.c:685 b_state=0x00000029, b_size=4096 __get_super include/linux/spinlock.h:310 [inline] get_super+0x2d/0x50 fs/super.c:714 device loop0 blocksize: 2048 fsync_bdev+0x17/0xc0 fs/block_dev.c:468 invalidate_partition+0x35/0x60 block/genhd.c:1569 __find_get_block_slow() failed. block=3, b_blocknr=1 drop_partitions.isra.12+0xdf/0x1e0 block/partition-generic.c:440 b_state=0x00000029, b_size=4096 rescan_partitions+0x75/0x910 block/partition-generic.c:513 __blkdev_reread_part+0x1ad/0x230 block/ioctl.c:173 device loop0 blocksize: 2048 blkdev_reread_part+0x26/0x40 block/ioctl.c:193 __find_get_block_slow() failed. block=3, b_blocknr=1 loop_reread_partitions+0x159/0x180 drivers/block/loop.c:641 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 loop_set_status+0xb95/0x1010 drivers/block/loop.c:1187 __find_get_block_slow() failed. block=3, b_blocknr=1 loop_set_status64+0xaa/0x100 drivers/block/loop.c:1305 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 lo_ioctl+0x6f5/0x2130 drivers/block/loop.c:1421 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 block_ioctl+0xee/0x130 fs/block_dev.c:1877 __find_get_block_slow() failed. block=3, b_blocknr=1 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 device loop0 blocksize: 2048 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 __find_get_block_slow() failed. block=3, b_blocknr=1 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 RIP: 0033:0x455979 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 RSP: 002b:00007fb3f9a7fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb3f9a806d4 RCX: 0000000000455979 b_state=0x00000029, b_size=4096 RDX: 0000000020000240 RSI: 0000000000004c04 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 device loop0 blocksize: 2048 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002b4 R14: 00000000006f8180 R15: 0000000000000000 __find_get_block_slow() failed. block=3, b_blocknr=1 Showing all locks held in the system: b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 2 locks held by khungtaskd/892: b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 #0: b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 000000008613738f ( b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 rcu_read_lock b_state=0x00000029, b_size=4096 ){....} device loop0 blocksize: 2048 , at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] , at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: __find_get_block_slow() failed. block=3, b_blocknr=1 000000007cbdc23d ( b_state=0x00000029, b_size=4096 tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4470: device loop0 blocksize: 2048 #0: 000000002e6d6d4a ( __find_get_block_slow() failed. block=3, b_blocknr=1 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f7b8cd25 ( b_state=0x00000029, b_size=4096 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4471: device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 #0: b_state=0x00000029, b_size=4096 000000001f173a3d ( device loop0 blocksize: 2048 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 __find_get_block_slow() failed. block=3, b_blocknr=1 #1: b_state=0x00000029, b_size=4096 00000000bac52576 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4472: #0: 000000005a55576c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 device loop0 blocksize: 2048 #1: 0000000004f0ac43 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4473: #0: 00000000033f2c2b __find_get_block_slow() failed. block=3, b_blocknr=1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000097772dc1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4474: #0: 00000000291b48dc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000064a5a06f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4475: #0: b_state=0x00000029, b_size=4096 00000000aa903eba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 device loop0 blocksize: 2048 #1: 00000000cbc794a1 __find_get_block_slow() failed. block=3, b_blocknr=1 ( b_state=0x00000029, b_size=4096 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4476: #0: device loop0 blocksize: 2048 00000000efd1e7aa __find_get_block_slow() failed. block=3, b_blocknr=1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=3, b_blocknr=1 00000000c57e7e5e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 3 locks held by syz-executor5/24744: b_state=0x00000029, b_size=4096 #0: 0000000093f12599 device loop0 blocksize: 2048 (&lo->lo_ctl_mutex/1 __find_get_block_slow() failed. block=3, b_blocknr=1 ){+.+.} b_state=0x00000029, b_size=4096 , at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1391 #1: 0000000092eebfd6 (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1e/0x40 block/ioctl.c:192 #2: device loop0 blocksize: 2048 0000000083ea99d4 ( __find_get_block_slow() failed. block=3, b_blocknr=1 &type->s_umount_key#73 b_state=0x00000029, b_size=4096 ){++++}, at: __get_super.part.12+0x20f/0x2e0 fs/super.c:685 1 lock held by blkid/24746: device loop0 blocksize: 2048 #0: 0000000092eebfd6 __find_get_block_slow() failed. block=3, b_blocknr=1 (&bdev->bd_mutex b_state=0x00000029, b_size=4096 ){+.+.}, at: __blkdev_get+0x193/0x13a0 fs/block_dev.c:1460 device loop0 blocksize: 2048 ============================================= NMI backtrace for cpu 1 __find_get_block_slow() failed. block=3, b_blocknr=1 CPU: 1 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc3+ #33 b_state=0x00000029, b_size=4096 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+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 device loop0 blocksize: 2048 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 __find_get_block_slow() failed. block=3, b_blocknr=1 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 b_state=0x00000029, b_size=4096 device loop0 blocksize: 2048 kthread+0x345/0x410 kernel/kthread.c:238 __find_get_block_slow() failed. block=3, b_blocknr=1 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 b_state=0x00000029, b_size=4096 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 24741 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #33 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x32/0xf3 lib/list_debug.c:42 RSP: 0018:ffff8801dae07598 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8801cfbc2570 RCX: ffff8801cfbc2570 RDX: ffff8801cfbc2570 RSI: ffffffff83524615 RDI: ffff8801cfbc2578 RBP: ffff8801dae075b0 R08: ffff8801c4538280 R09: 0000000000000001 R10: ffffed0043fff001 R11: ffff88021fff8017 R12: ffff8801d7efa6f0 R13: ffff8801dae07990 R14: ffff8801cfbc24c0 R15: 0000000000000001 FS: 00007fb8dafa7700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001af646000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_move include/linux/list.h:170 [inline] detach_tasks kernel/sched/fair.c:7564 [inline] load_balance+0x15cc/0x3580 kernel/sched/fair.c:8898 rebalance_domains+0x809/0xd80 kernel/sched/fair.c:9276 run_rebalance_domains+0x351/0x4a0 kernel/sched/fair.c:9898 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:525 [inline] smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1678 [inline] RIP: 0010:vprintk_emit+0xbd0/0xdd0 kernel/printk/printk.c:1906 RSP: 0018:ffff88018688ee50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc900123c5000 RDX: 0000000000040000 RSI: ffffffff8160be97 RDI: 0000000000000246 RBP: ffff88018688efe0 R08: ffff8801c4538ab8 R09: 0000000000000006 R10: ffff8801c4538280 R11: 0000000000000000 R12: 1ffffffff11a316d R13: 000000000000001f R14: ffffed0030d11de7 R15: ffffffff8a6d3360 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379 printk+0x9e/0xba kernel/printk/printk.c:1980 __find_get_block_slow fs/buffer.c:235 [inline] __find_get_block.cold.58+0x85/0x103 fs/buffer.c:1287 __getblk_slow fs/buffer.c:1032 [inline] __getblk_gfp+0x2a1/0xaf0 fs/buffer.c:1313 __bread_gfp+0x2d/0x310 fs/buffer.c:1347 sb_bread include/linux/buffer_head.h:309 [inline] fat__get_entry+0x594/0xa20 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_get_short_entry+0x13c/0x2c0 fs/fat/dir.c:876 fat_subdirs+0x134/0x280 fs/fat/dir.c:942 fat_read_root fs/fat/inode.c:1403 [inline] fat_fill_super+0x29d0/0x4400 fs/fat/inode.c:1833 msdos_fill_super+0x2e/0x40 fs/fat/namei_msdos.c:655 mount_bdev+0x30c/0x3e0 fs/super.c:1164 msdos_mount+0x34/0x40 fs/fat/namei_msdos.c:662 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4583aa RSP: 002b:00007fb8dafa6ba8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00000000004583aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fb8dafa6bf0 RBP: 0000000000000001 R08: 0000000020000300 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013 R13: 0000000000000001 R14: 00000000006fe360 R15: 0000000000000000 Code: fc ff df 55 48 89 e5 41 55 41 54 53 48 89 fb 48 83 c7 08 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a0 00 00 00 48 89 da 4c 8b 63 08 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8b