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-executor0:8621 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.19.0-rc4+ #29 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 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. __find_get_block_slow() failed. block=1, b_blocknr=8 syz-executor0 D b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 22056 8621 5522 0x00000004 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 Call Trace: b_state=0x00000029, b_size=512 context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 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 schedule+0xfe/0x460 kernel/sched/core.c:3517 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575 __find_get_block_slow() failed. block=1, b_blocknr=8 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 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 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 lock_fat fs/fat/fatent.c:279 [inline] fat_count_free_clusters+0x122/0xd40 fs/fat/fatent.c:658 __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 fat_statfs+0x3b4/0x4c0 fs/fat/inode.c:822 statfs_by_dentry+0x136/0x210 fs/statfs.c:64 vfs_statfs+0x47/0x2e0 fs/statfs.c:74 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 user_statfs+0xbd/0x150 fs/statfs.c:89 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __do_sys_statfs+0x7f/0xf0 fs/statfs.c:179 __se_sys_statfs fs/statfs.c:176 [inline] __x64_sys_statfs+0x54/0x80 fs/statfs.c:176 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 __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 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RIP: 0033:0x457679 b_state=0x00000029, b_size=512 Code: 1d b4 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 device loop0 blocksize: 4096 RSP: 002b:00007fad4b818c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000089 RAX: ffffffffffffffda RBX: 00007fad4b8196d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000020000600 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d7818 R14: 00000000004bdf8a R15: 0000000000000000 Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 7 locks held by kworker/u4:0/7: b_state=0x00000029, b_size=512 1 lock held by khungtaskd/985: device loop0 blocksize: 4096 #0: 000000009a4840d1 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/5354: #0: 000000005004a04b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5476: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000077f62d10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #1: 00000000029467ff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by getty/5477: #0: 000000009ec110f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #1: 00000000d115ae5d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5478: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 000000009f0a08f3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000008f1b07ac (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/5479: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 000000007a0b97b6 device loop0 blocksize: 4096 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000006479fa98 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/5480: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 00000000360f8126 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c9e5dd2c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by getty/5481: #0: 00000000bd21ae91 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #1: 00000000f2e6d67b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by getty/5482: #0: 00000000d5d8fb40 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000026357c69 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by syz-executor0/8621: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #0: 0000000079179066 (&sbi->fat_lock){+.+.}, at: lock_fat fs/fat/fatent.c:279 [inline] #0: 0000000079179066 (&sbi->fat_lock){+.+.}, at: fat_count_free_clusters+0x122/0xd40 fs/fat/fatent.c:658 2 locks held by syz-executor0/8632: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ============================================= device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 985 Comm: khungtaskd Not tainted 4.19.0-rc4+ #29 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+0x1c4/0x2b4 lib/dump_stack.c:113 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101 device loop0 blocksize: 4096 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb3e/0x1050 kernel/hung_task.c:265 __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 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.081 msecs NMI backtrace for cpu 1 CPU: 1 PID: 8632 Comm: syz-executor0 Not tainted 4.19.0-rc4+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:217 [inline] RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline] RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline] RIP: 0010:check_memory_region+0x196/0x1b0 mm/kasan/kasan.c:267 Code: 01 d8 80 3b 00 75 17 4d 39 c1 4c 89 cb 0f 84 3e ff ff ff 49 83 c1 01 41 80 79 ff 00 74 e9 48 89 d8 e9 26 ff ff ff 49 0f be 02 <41> 83 e3 07 49 39 c3 0f 8c 1a ff ff ff eb 94 48 89 c3 eb a2 4c 89 RSP: 0018:ffff88018be47078 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 1ffff100317c8e27 RCX: ffffffff819d7e47 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88018be47138 RBP: ffff88018be47090 R08: ffffed00317c8e28 R09: ffffed00317c8e27 R10: ffffed00317c8e27 R11: ffff88018be4713b R12: ffffed00317c8e28 R13: ffff88018be473b8 R14: ffffed00317c8e27 R15: dffffc0000000000 FS: 00007fad4b7f8700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000024f5000 CR3: 00000001cc561000 CR4: 00000000001406e0 Call Trace: kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:72 [inline] atomic_fetch_add_unless include/linux/atomic.h:580 [inline] atomic_add_unless include/linux/atomic.h:597 [inline] page_ref_add_unless include/linux/page_ref.h:157 [inline] get_page_unless_zero include/linux/mm.h:531 [inline] page_cache_get_speculative include/linux/pagemap.h:186 [inline] find_get_entry+0x4e7/0xc40 mm/filemap.c:1448 pagecache_get_page+0x12f/0xf00 mm/filemap.c:1541 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1016 [inline] __getblk_slow fs/buffer.c:1043 [inline] __getblk_gfp+0x3b0/0xd50 fs/buffer.c:1320 __bread_gfp+0x2d/0x300 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat_ent_bread+0x173/0x290 fs/fat/fatent.c:107 fat_ent_read_block fs/fat/fatent.c:442 [inline] fat_count_free_clusters+0x65f/0xd40 fs/fat/fatent.c:677 fat_statfs+0x3b4/0x4c0 fs/fat/inode.c:822 statfs_by_dentry+0x136/0x210 fs/statfs.c:64 vfs_statfs+0x47/0x2e0 fs/statfs.c:74 user_statfs+0xbd/0x150 fs/statfs.c:89 __do_sys_statfs+0x7f/0xf0 fs/statfs.c:179 __se_sys_statfs fs/statfs.c:176 [inline] __x64_sys_statfs+0x54/0x80 fs/statfs.c:176 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fad4b7f7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000089 RAX: ffffffffffffffda RBX: 00007fad4b7f86d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000020000600 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d7818 R14: 00000000004bdf8a R15: 0000000000000001