device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 INFO: task syz-executor0:14830 blocked for more than 120 seconds. b_state=0x00000029, b_size=512 Not tainted 4.17.0+ #84 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D device loop0 blocksize: 4096 23392 14830 7234 0x00000004 Call Trace: __find_get_block_slow() failed. block=2, b_blocknr=16 context_switch kernel/sched/core.c:2856 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3498 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 schedule+0xef/0x430 kernel/sched/core.c:3542 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __rwsem_down_write_failed_common+0x919/0x15d0 kernel/locking/rwsem-xadd.c:566 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 b_state=0x00000029, b_size=512 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+0xa2/0x120 kernel/locking/rwsem.c:72 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 inode_lock include/linux/fs.h:713 [inline] do_truncate+0x197/0x2a0 fs/open.c:61 __find_get_block_slow() failed. block=1, b_blocknr=8 handle_truncate fs/namei.c:2960 [inline] do_last fs/namei.c:3379 [inline] path_openat+0x3195/0x4dc0 fs/namei.c:3511 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_filp_open+0x249/0x350 fs/namei.c:3545 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 do_sys_open+0x56f/0x740 fs/open.c:1101 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 ksys_open include/linux/syscalls.h:1268 [inline] __do_sys_creat fs/open.c:1159 [inline] __se_sys_creat fs/open.c:1157 [inline] __x64_sys_creat+0x61/0x80 fs/open.c:1157 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, 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 b_state=0x00000029, b_size=512 Code: Bad RIP value. device loop0 blocksize: 4096 RSP: 002b:00007f62ed6dbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f62ed6dc6d4 RCX: 0000000000455a09 __find_get_block_slow() failed. block=2, b_blocknr=16 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 R13: 000000000000006a R14: 00000000006f5a90 R15: 0000000000000001 Showing all locks held in the system: __find_get_block_slow() failed. block=2, b_blocknr=16 3 locks held by kworker/u4:4/524: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by khungtaskd/895: #0: 0000000029733b38 __find_get_block_slow() failed. block=1, b_blocknr=8 (rcu_read_lock){....} b_state=0x00000029, b_size=512 , at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] , at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 0000000029733b38 device loop0 blocksize: 4096 (rcu_read_lock){....}, at: debug_show_all_locks+0xc8/0x40c kernel/locking/lockdep.c:4461 __find_get_block_slow() failed. block=2, b_blocknr=16 1 lock held by rsyslogd/4376: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000010666d00 (&f->f_pos_lock){+.+.} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 2 locks held by getty/4466: b_state=0x00000029, b_size=512 #0: 000000006fd10e9e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 000000008a018599 (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=2, b_blocknr=16 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4467: b_state=0x00000029, b_size=512 #0: 0000000054f89a73 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000fcc5757c (&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/4468: b_state=0x00000029, b_size=512 #0: 000000003d7e2c16 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 000000005026f3cc (&ldata->atomic_read_lock __find_get_block_slow() failed. block=2, b_blocknr=16 ){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4469: b_state=0x00000029, b_size=512 #0: 00000000819a77c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 0000000051afc314 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4470: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000064d268a5 (&tty->ldisc_sem){++++} __find_get_block_slow() failed. block=2, b_blocknr=16 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 000000003f596769 (&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: 4096 #0: 00000000a7a647cb (&tty->ldisc_sem __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 000000004541cfe3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4472: device loop0 blocksize: 4096 #0: 00000000b2fbbdef __find_get_block_slow() failed. block=2, b_blocknr=16 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 b_state=0x00000029, b_size=512 #1: 00000000f044058d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 8 locks held by syz-executor0/14784: device loop0 blocksize: 4096 2 locks held by syz-executor0/14830: #0: 0000000021d78d9c (sb_writers#17){.+.+} __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=0x00000029, b_size=512 000000007a5756f6 (&sb->s_type->i_mutex_key#18){++++}, at: inode_lock include/linux/fs.h:713 [inline] 000000007a5756f6 (&sb->s_type->i_mutex_key#18){++++}, at: do_truncate+0x197/0x2a0 fs/open.c:61 1 lock held by syz-executor0/14837: device loop0 blocksize: 4096 #0: 0000000053abcc40 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 __find_get_block_slow() failed. block=2, b_blocknr=16 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 895 Comm: khungtaskd Not tainted 4.17.0+ #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x00000029, b_size=512 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 device loop0 blocksize: 4096 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 __find_get_block_slow() failed. block=1, b_blocknr=8 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 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=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 kthread+0x345/0x410 kernel/kthread.c:240 b_state=0x00000029, b_size=512 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: device loop0 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 14784 Comm: syz-executor0 Not tainted 4.17.0+ #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:335 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:332 [inline] RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0x19c/0xa10 kernel/locking/lockdep.c:3942 Code: 08 84 d2 0f 85 43 06 00 00 41 c7 87 34 08 00 00 01 00 00 00 0f 1f 44 00 00 65 8b 05 be 62 a4 7e 89 c0 48 0f a3 05 e4 d0 1e 08 <0f> 82 1c 05 00 00 4d 8d bc 24 40 ff ff ff 48 c7 c7 00 e8 09 89 48 RSP: 0018:ffff8801daf078a8 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 1ffff1003b5e0f1a RCX: ffff88018265aeb8 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88018265aeb4 RBP: ffff8801daf079d8 R08: 0000000000000000 R09: ffff8801c71cdd00 R10: ffff8801c71cde48 R11: 1ffff1003b5e0edf R12: ffff8801daf079b0 R13: ffff8801daf2c718 R14: ffff8801daf07ab8 R15: ffff88018265a680 FS: 00007f62ed6fd700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000cc0000 CR3: 00000001c23e6000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:176 rq_unlock kernel/sched/sched.h:1838 [inline] scheduler_tick+0x1d4/0x420 kernel/sched/core.c:3085 update_process_times+0x51/0x70 kernel/time/timer.c:1641 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+0x3e3/0x10a0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 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 Code: fc ff df 41 80 3c 04 00 0f 85 08 02 00 00 48 83 3d fc c8 70 07 00 0f 84 f7 00 00 00 e8 c9 70 18 00 48 8b bd a8 fe ff ff 57 9d <0f> 1f 44 00 00 e9 18 fe ff ff 41 80 fd 64 0f 84 eb f9 ff ff e9 ef RSP: 0018:ffff8801854ce810 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc900120ca000 RDX: 0000000000040000 RSI: ffffffff8160e037 RDI: 0000000000000246 RBP: ffff8801854ce9a0 R08: ffff88018265aeb8 R09: 0000000000000006 R10: ffff88018265a680 R11: 0000000000000000 R12: 1ffffffff11a3525 R13: 000000000000001c R14: ffffed0030a99d1f R15: ffffffff8a6d3420 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:237 [inline] __find_get_block.cold.58+0xdd/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_ent_bread+0x173/0x290 fs/fat/fatent.c:106 fat_ent_read_block fs/fat/fatent.c:441 [inline] fat_alloc_clusters+0x8bf/0x16b0 fs/fat/fatent.c:489 fat_add_cluster+0x72/0x140 fs/fat/inode.c:101 __fat_get_block fs/fat/inode.c:148 [inline] fat_get_block+0x373/0xaf0 fs/fat/inode.c:177 __block_write_begin_int+0x505/0x1ad0 fs/buffer.c:1958 __block_write_begin fs/buffer.c:2008 [inline] block_write_begin+0xd2/0x350 fs/buffer.c:2067 cont_write_begin+0x531/0x820 fs/buffer.c:2417 fat_write_begin+0x8d/0x120 fs/fat/inode.c:223 generic_perform_write+0x39a/0x6a0 mm/filemap.c:3139 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3264 generic_file_write_iter+0x430/0x850 mm/filemap.c:3292 call_write_iter include/linux/fs.h:1786 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 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+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f62ed6fcc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f62ed6fd6d4 RCX: 0000000000455a09 RDX: 00000000fffffd97 RSI: 0000000020000180 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007ab R14: 00000000007008a8 R15: 0000000000000000