b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 INFO: task syz-executor0:16866 blocked for more than 120 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.17.0-rc6+ #63 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25408 16866 4557 0x00000004 Call Trace: b_state=0x00000021, b_size=512 context_switch kernel/sched/core.c:2859 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3501 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 schedule+0xef/0x430 kernel/sched/core.c:3545 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 __rwsem_down_write_failed_common+0x919/0x15d0 kernel/locking/rwsem-xadd.c:565 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:594 device loop0 blocksize: 4096 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xa6/0x120 kernel/locking/rwsem.c:193 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 inode_lock_nested include/linux/fs.h:748 [inline] do_unlinkat+0x3c4/0xa10 fs/namei.c:4019 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __do_sys_unlink fs/namei.c:4080 [inline] __se_sys_unlink fs/namei.c:4078 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4078 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f9d163a0c68 EFLAGS: 00000246 b_state=0x00000021, b_size=512 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f9d163a16d4 RCX: 0000000000455a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100 device loop0 blocksize: 4096 RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000076f R14: 00000000006ff308 R15: 0000000000000001 Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by khungtaskd/893: b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000614932a2 (rcu_read_lock b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 ){....}, 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=1, b_blocknr=8 0000000045a8ee8a (tasklist_lock){.+.+} b_state=0x00000021, b_size=512 , at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4480: device loop0 blocksize: 4096 #0: 0000000069e6642a ( __find_get_block_slow() failed. block=1, b_blocknr=8 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fb6785a8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4481: b_state=0x00000021, b_size=512 #0: 00000000de3c7bc2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000c87d8a4d (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4482: b_state=0x00000021, b_size=512 #0: 0000000085e52b50 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 0000000030f46cc0 (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4483: b_state=0x00000021, b_size=512 #0: 00000000cb3f31a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 0000000083423bfc (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4484: b_state=0x00000021, b_size=512 #0: 0000000098ff27dc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 000000005ce593f2 (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4485: b_state=0x00000021, b_size=512 #0: 00000000ad873771 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000cbb334eb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4486: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 000000001879c459 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000021, b_size=512 0000000069a59ead (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by syz-executor0/16866: device loop0 blocksize: 4096 #0: 000000000dc44131 (sb_writers#16){.+.+} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: sb_start_write include/linux/fs.h:1550 [inline] , at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: b_state=0x00000021, b_size=512 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: do_unlinkat+0x3c4/0xa10 fs/namei.c:4019 2 locks held by syz-executor0/16882: device loop0 blocksize: 4096 #0: 000000000dc44131 (sb_writers __find_get_block_slow() failed. block=1, b_blocknr=8 #16){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: b_state=0x00000021, b_size=512 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: filename_create+0x1aa/0x5a0 fs/namei.c:3606 2 locks held by syz-executor0/16899: device loop0 blocksize: 4096 #0: 000000000dc44131 ( __find_get_block_slow() failed. block=1, b_blocknr=8 sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: b_state=0x00000021, b_size=512 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: lock_rename+0x236/0x290 fs/namei.c:2809 2 locks held by syz-executor0/16900: device loop0 blocksize: 4096 #0: 000000000dc44131 ( __find_get_block_slow() failed. block=1, b_blocknr=8 sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: b_state=0x00000021, b_size=512 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] 0000000010b79148 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: do_unlinkat+0x3c4/0xa10 fs/namei.c:4019 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 893 Comm: khungtaskd Not tainted 4.17.0-rc6+ #63 __find_get_block_slow() failed. block=1, b_blocknr=8 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 b_state=0x00000021, b_size=512 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 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 device loop0 blocksize: 4096 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 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 kthread+0x345/0x410 kernel/kthread.c:240 device loop0 blocksize: 4096 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 0 CPU: 0 PID: 16803 Comm: syz-executor0 Not tainted 4.17.0-rc6+ #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__next_timer_interrupt+0x0/0x1a0 kernel/time/timer.c:1230 RSP: 0018:ffff8801dae07978 EFLAGS: 00000006 RAX: ffff8801816865c0 RBX: 0000000000000003 RCX: ffffffff8166fc2c RDX: 0000000000000100 RSI: ffffffff8166fc37 RDI: ffff8801dae23700 RBP: ffff8801dae07c70 R08: ffff8801816865c0 R09: ffffed003b5c46e0 R10: ffffed003b5c46e0 R11: ffff8801dae23703 R12: 00000001000112b0 R13: 0000000000000001 R14: ffff8801dae07c48 R15: dffffc0000000000 FS: 00007f9d163c2700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001b77000 CR3: 00000001cf1a5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __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:ffff8801ae676c60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90001ea8000 RDX: 0000000000040000 RSI: ffffffff8160d0c7 RDI: 0000000000000246 RBP: ffff8801ae676df0 R08: ffff880181686df8 R09: 0000000000000006 R10: ffff8801816865c0 R11: 0000000000000000 R12: 1ffffffff11a31ad R13: 0000000000000034 R14: ffffed0035cceda9 R15: ffffffff8a6d4360 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:231 [inline] __find_get_block.cold.58+0x3a/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_search_long+0x33b/0x15d0 fs/fat/dir.c:477 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697 vfat_rename+0x261/0x1590 fs/fat/namei_vfat.c:925 vfs_rename+0x670/0x1ac0 fs/namei.c:4449 do_renameat2+0xe96/0x1150 fs/namei.c:4597 __do_sys_rename fs/namei.c:4643 [inline] __se_sys_rename fs/namei.c:4641 [inline] __x64_sys_rename+0x5e/0x80 fs/namei.c:4641 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f9d163c1c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f9d163c26d4 RCX: 0000000000455a09 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000080 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000054e R14: 00000000006fbff0 R15: 0000000000000000 Code: 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 41 bd ff ff ff ff eb 9f e8 62 c7 4e 00 e9 76 ff ff ff e8 58 c7 4e 00 eb ae 66 0f 1f 44 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 49 89 fc 53 48 83 ec 18 e8 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.436 msecs