__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 INFO: task syz-executor3:16175 blocked for more than 140 seconds. device loop3 blocksize: 4096 Not tainted 4.20.0-rc7+ #163 __find_get_block_slow() failed. block=1, b_blocknr=8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 syz-executor3 D22704 16175 6132 0x00000004 __find_get_block_slow() failed. block=1, b_blocknr=8 Call Trace: b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 schedule+0xfe/0x460 kernel/sched/core.c:3516 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __find_get_block_slow() failed. block=1, b_blocknr=8 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 inode_lock_shared include/linux/fs.h:767 [inline] do_last fs/namei.c:3323 [inline] path_openat+0x250a/0x5160 fs/namei.c:3534 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_filp_open+0x255/0x380 fs/namei.c:3564 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 do_sys_open+0x568/0x700 fs/open.c:1063 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 device loop3 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=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 RIP: 0033:0x457669 __find_get_block_slow() failed. block=1, b_blocknr=8 Code: Bad RIP value. b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007fcafff9cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457669 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RDX: 0000000000000002 RSI: 0000000020000200 RDI: 000000000000000a b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcafff9d6d4 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 R13: 00000000004c3047 R14: 00000000004d5658 R15: 00000000ffffffff b_state=0x00000021, b_size=512 INFO: task syz-executor3:16184 blocked for more than 140 seconds. device loop3 blocksize: 4096 Not tainted 4.20.0-rc7+ #163 __find_get_block_slow() failed. block=1, b_blocknr=8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. b_state=0x00000021, b_size=512 syz-executor3 D23864 16184 6132 0x00000004 device loop3 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 schedule+0xfe/0x460 kernel/sched/core.c:3516 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __rwsem_down_write_failed_common+0xbbc/0x15e0 kernel/locking/rwsem-xadd.c:577 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 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:606 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 b_state=0x00000021, b_size=512 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xa9/0x130 kernel/locking/rwsem.c:195 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 inode_lock_nested include/linux/fs.h:792 [inline] do_rmdir+0x38f/0x630 fs/namei.c:3928 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __do_sys_rmdir fs/namei.c:3958 [inline] __se_sys_rmdir fs/namei.c:3956 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3956 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000021, b_size=512 RIP: 0033:0x457669 device loop3 blocksize: 4096 Code: Bad RIP value. __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007fcafff7bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 b_state=0x00000021, b_size=512 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457669 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001540 device loop3 blocksize: 4096 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 __find_get_block_slow() failed. block=1, b_blocknr=8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcafff7c6d4 b_state=0x00000021, b_size=512 R13: 00000000004c3c21 R14: 00000000004d68e8 R15: 00000000ffffffff device loop3 blocksize: 4096 INFO: task syz-executor3:16205 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.20.0-rc7+ #163 b_state=0x00000021, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D25208 16205 6132 0x00000004 device loop3 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 schedule+0xfe/0x460 kernel/sched/core.c:3516 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __find_get_block_slow() failed. block=1, b_blocknr=8 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 inode_lock_shared include/linux/fs.h:767 [inline] do_last fs/namei.c:3323 [inline] path_openat+0x250a/0x5160 fs/namei.c:3534 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 do_filp_open+0x255/0x380 fs/namei.c:3564 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_sys_open+0x568/0x700 fs/open.c:1063 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 entry_SYSCALL_64_after_hwframe+0x49/0xbe __find_get_block_slow() failed. block=1, b_blocknr=8 RIP: 0033:0x457669 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 Code: Bad RIP value. b_state=0x00000021, b_size=512 RSP: 002b:00007fcafff5ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 device loop3 blocksize: 4096 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457669 RDX: 0000000000000002 RSI: 0000000020000200 RDI: 0000000000000012 __find_get_block_slow() failed. block=1, b_blocknr=8 RBP: 000000000072c0e0 R08: 0000000000000000 R09: 0000000000000000 b_state=0x00000021, b_size=512 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcafff5b6d4 device loop3 blocksize: 4096 R13: 00000000004c3047 R14: 00000000004d5658 R15: 00000000ffffffff Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by khungtaskd/1019: b_state=0x00000021, b_size=512 #0: 00000000006e4157 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 device loop3 blocksize: 4096 1 lock held by rsyslogd/5938: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000b5943d09 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 b_state=0x00000021, b_size=512 2 locks held by getty/6027: device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000709ab47a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 000000007d31cc29 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 2 locks held by getty/6028: #0: 000000003d9d5c63 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop3 blocksize: 4096 #1: 0000000069860043 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6029: #0: 00000000107390a2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000021, b_size=512 #1: 00000000337b12d2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 device loop3 blocksize: 4096 2 locks held by getty/6030: #0: 00000000031e6e9a (&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 #1: 00000000b46afbe8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6031: b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000a82b093a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 #1: 00000000da396d0d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6032: b_state=0x00000021, b_size=512 #0: 00000000f268b34b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop3 blocksize: 4096 #1: 00000000f5f7d093 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/6033: b_state=0x00000021, b_size=512 #0: 000000008534af8d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop3 blocksize: 4096 #1: 00000000e0638592 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 7 locks held by syz-executor3/16166: b_state=0x00000021, b_size=512 2 locks held by syz-executor3/16175: device loop3 blocksize: 4096 #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: do_last fs/namei.c:3323 [inline] #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: path_openat+0x250a/0x5160 fs/namei.c:3534 b_state=0x00000021, b_size=512 2 locks held by syz-executor3/16184: #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 device loop3 blocksize: 4096 #1: 000000004276577c (&sb->s_type->i_mutex_key#23/1){+.+.}, at: inode_lock_nested include/linux/fs.h:792 [inline] #1: 000000004276577c (&sb->s_type->i_mutex_key#23/1){+.+.}, at: do_rmdir+0x38f/0x630 fs/namei.c:3928 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by syz-executor3/16205: b_state=0x00000021, b_size=512 #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 00000000be4d6f45 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 device loop3 blocksize: 4096 #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: do_last fs/namei.c:3323 [inline] #1: 000000004276577c (&sb->s_type->i_mutex_key#23){++++}, at: path_openat+0x250a/0x5160 fs/namei.c:3534 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 ============================================= device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 1 b_state=0x00000021, b_size=512 CPU: 1 PID: 1019 Comm: khungtaskd Not tainted 4.20.0-rc7+ #163 device loop3 blocksize: 4096 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 __find_get_block_slow() failed. block=1, b_blocknr=8 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop3 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 b_state=0x00000021, b_size=512 Sending NMI from CPU 1 to CPUs 0: device loop3 blocksize: 4096 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.750 msecs NMI backtrace for cpu 0 CPU: 0 PID: 16166 Comm: syz-executor3 Not tainted 4.20.0-rc7+ #163 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x2e8/0x8d0 kernel/locking/lockdep.c:3401 Code: 80 4d 89 fc 48 b9 00 00 00 00 00 fc ff df c6 04 08 f8 75 4a 31 c0 48 ba 00 00 00 00 00 fc ff df 48 01 d3 48 c7 03 00 00 00 00 <48> c7 43 08 00 00 00 00 48 8b 75 d0 65 48 33 34 25 28 00 00 00 0f RSP: 0018:ffff8881dae07af0 EFLAGS: 00000086 RAX: 0000000000000000 RBX: ffffed103b5c0f63 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8959bfc0 RDI: ffff8881841e291a RBP: ffff8881dae07be0 R08: ffff8881841e2000 R09: ffffed103b5c5b5f R10: ffffed103b5c5b5f R11: ffff8881dae2dafb R12: ffff8881841e2000 R13: ffff8881841e28f8 R14: ffff8881dae07bb8 R15: 0000000000000003 FS: 00007fcafffbe700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c15c8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held+0xb5/0x140 kernel/locking/lockdep.c:3664 lock_is_held_type+0x118/0x210 kernel/locking/lockdep.c:3882 lock_is_held include/linux/lockdep.h:339 [inline] rcu_read_lock_sched_held+0x108/0x120 kernel/rcu/update.c:117 trace_softirq_entry include/trace/events/irq.h:128 [inline] __do_softirq+0x96f/0xb2e kernel/softirq.c:291 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1688 [inline] RIP: 0010:vprintk_emit+0x881/0x990 kernel/printk/printk.c:1921 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ef 00 00 00 48 83 3d bf e9 ec 07 00 74 2d e8 28 a0 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 a3 fe ff ff e8 10 a0 19 00 0f 0b e8 09 a0 19 00 RSP: 0018:ffff8881845defe8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 1ffff110308bbe03 RCX: ffffc9000be22000 RDX: 0000000000040000 RSI: ffffffff816517b8 RDI: 0000000000000246 RBP: ffff8881845df160 R08: ffff8881841e2918 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881841e2000 R12: 0000000000000200 R13: 0000000000000000 R14: ffffed10308bbe17 R15: ffff8881845df138 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 __find_get_block_slow fs/buffer.c:237 [inline] __find_get_block.cold.57+0xd8/0xff fs/buffer.c:1294 __getblk_slow fs/buffer.c:1039 [inline] __getblk_gfp+0x2b3/0xd50 fs/buffer.c:1320 __bread_gfp+0x2d/0x300 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x33b/0x1570 fs/fat/dir.c:479 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697 vfat_lookup+0x107/0x640 fs/fat/namei_vfat.c:711 __lookup_hash+0x12e/0x190 fs/namei.c:1546 do_rmdir+0x3b3/0x630 fs/namei.c:3929 __do_sys_rmdir fs/namei.c:3958 [inline] __se_sys_rmdir fs/namei.c:3956 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3956 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcafffbdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001540 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcafffbe6d4 R13: 00000000004c3c21 R14: 00000000004d68e8 R15: 00000000ffffffff