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 INFO: task syz-executor0:9102 blocked for more than 140 seconds. Not tainted 4.9.117-g8b21e85 #19 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D26952 9102 1 0x00000004 ffff8801bf2f0000 0000000000000000 ffff8801bdeef9c0 ffff8801cdbf8000 ffff8801db321c18 ffff8801d732fb40 ffffffff839ebd0d 0000000000000002 0000000041b58ab3 ffffffff843bc37b 00ffffff81221590 ffff8801db3224e8 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 __find_get_block_slow() failed. block=1, b_blocknr=8 [] wb_wait_for_completion+0x149/0x1b0 fs/fs-writeback.c:221 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 [] __writeback_inodes_sb_nr+0x207/0x300 fs/fs-writeback.c:2310 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 [] writeback_inodes_sb_nr fs/fs-writeback.c:2327 [inline] [] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2342 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __sync_filesystem fs/sync.c:35 [inline] [] sync_filesystem+0x93/0x240 fs/sync.c:63 b_state=0x00000029, b_size=512 [] generic_shutdown_super+0x75/0x300 fs/super.c:423 device loop0 blocksize: 4096 [] kill_block_super+0x9f/0x120 fs/super.c:1127 __find_get_block_slow() failed. block=1, b_blocknr=8 [] deactivate_locked_super+0x75/0xd0 fs/super.c:310 b_state=0x00000029, b_size=512 [] deactivate_super+0x91/0xd0 fs/super.c:341 device loop0 blocksize: 4096 [] cleanup_mnt+0xb2/0x160 fs/namespace.c:1134 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __cleanup_mnt+0x16/0x20 fs/namespace.c:1141 b_state=0x00000029, b_size=512 [] task_work_run+0x10c/0x180 kernel/task_work.c:116 device loop0 blocksize: 4096 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:161 __find_get_block_slow() failed. block=1, b_blocknr=8 [] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:260 [inline] [] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287 b_state=0x00000029, b_size=512 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb device loop0 blocksize: 4096 Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by khungtaskd/519: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (rcu_read_lock){......}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] , at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: device loop0 blocksize: 4096 (tasklist_lock){.+.+..}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 device loop0 blocksize: 4096 2 locks held by rs:main Q:Reg/3674: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 sb_writers#3){.+.+.+}, at: [] file_start_write include/linux/fs.h:2640 [inline] sb_writers#3){.+.+.+}, at: [] vfs_write+0x3ae/0x530 fs/read_write.c:556 2 locks held by getty/3772: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 b_state=0x00000029, b_size=512 1 lock held by syz-executor0/9102: device loop0 blocksize: 4096 #0: (&type->s_umount_key __find_get_block_slow() failed. block=1, b_blocknr=8 #43b_state=0x00000029, b_size=512 ){++++..}device loop0 blocksize: 4096 , at: [] deactivate_super+0x89/0xd0 fs/super.c:340 b_state=0x00000029, b_size=512 1 lock held by init/14459: device loop0 blocksize: 4096 #0: (tty_mutex __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.+.}b_state=0x00000029, b_size=512 , at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] , at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/14460: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 tty_mutexdevice loop0 blocksize: 4096 ){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] ){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/14461: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/14462: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/14463: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] , at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 0 __find_get_block_slow() failed. block=1, b_blocknr=8 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19 b_state=0x00000029, b_size=512 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 device loop0 blocksize: 4096 ffff8801d867fd08 ffffffff81eb4be9 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000000000000b_state=0x00000029, b_size=512 0000000000000000device loop0 blocksize: 4096 0000000000000000 0000000000000001 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff810b9bd0b_state=0x00000029, b_size=512 ffff8801d867fd40device loop0 blocksize: 4096 ffffffff81ebfee7 0000000000000000 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000000000000b_state=0x00000029, b_size=512 0000000000000003device loop0 blocksize: 4096 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 b_state=0x00000029, b_size=512 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 device loop0 blocksize: 4096 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6b4/0xa20 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1924 Comm: jbd2/sda1-8 Not tainted 4.9.117-g8b21e85 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cdbf8000 task.stack: ffff8801cd400000 RIP: 0010:[] c [] __sanitizer_cov_trace_pc+0x0/0x50 RSP: 0018:ffff8801cd407548 EFLAGS: 00000202 RAX: 8000000000000864 RBX: ffffea0006cc5ac0 RCX: ffff8801cdbf8000 RDX: 1ffffd4000d98b58 RSI: ffffffff814676ec RDI: ffffea0006cc5ac0 RBP: ffff8801cd407580 R08: ffff8801cdbf88e8 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffffea0006cc5ae0 R13: ffffea0006cc5ac0 R14: ffffea000722b2e0 R15: ffff8801d61470c8 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdf7c160a30 CR3: 00000001bcb81000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff814678eac ffffea0006cc5ac0c ffffea0006cc5ac0c 0000000000000001c dffffc0000000000c 0000000000000000c ffff8801d61470c8c ffff8801cd4075d8c ffffffff8143a640c ffff8801cd4075f0c 00000000000304a3c fffffbfff098c4a8c Call Trace: [] pagecache_get_page+0x3a0/0x720 mm/filemap.c:1227 [] find_get_page_flags include/linux/pagemap.h:264 [inline] [] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212 [] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360 [] __getblk_gfp+0x38/0x710 fs/buffer.c:1382 [] __getblk include/linux/buffer_head.h:373 [inline] [] jbd2_journal_get_descriptor_buffer+0x110/0x370 fs/jbd2/journal.c:837 [] journal_submit_commit_record+0x11a/0xab0 fs/jbd2/commit.c:134 [] jbd2_journal_commit_transaction+0x4158/0x6050 fs/jbd2/commit.c:869 [] kjournald2+0x22a/0x830 fs/jbd2/journal.c:224 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Code: c1d c00 ceb c81 c4c c89 cff ce8 caf cd4 c1d c00 ce9 c5f cff cff cff c48 c89 cdf ce8 c02 cd4 c1d c00 ce9 cf9 cfe cff cff c66 c2e c0f c1f c84 c00 c00 c00 c00 c00 c0f c1f c00 c<55> c48 c89 ce5 c65 c48 c8b c04 c25 cc0 c7d c01 c00 c65 c8b c15 c2c c92 ccb c7e c81 c __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 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 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 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 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 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 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 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 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 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 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 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 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096