INFO: task syz-executor.2:8779 blocked for more than 143 seconds.
      Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D25160  8779   8596 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x7b7/0xc30 kernel/sched/core.c:4078
 schedule+0x131/0x1e0 kernel/sched/core.c:4145
 io_schedule+0x8b/0x100 kernel/sched/core.c:5789
 wait_on_page_bit_common+0x918/0xc90 mm/filemap.c:1175
 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224
 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822
 __filemap_fdatawait_range+0x1b5/0x3b0 mm/filemap.c:526
 file_write_and_wait_range+0x141/0x1a0 mm/filemap.c:786
 __generic_file_fsync+0x76/0x1a0 fs/libfs.c:1000
 fat_file_fsync+0x7c/0x190 fs/fat/file.c:199
 vfs_fsync_range+0xfd/0x1a0 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2851 [inline]
 generic_file_write_iter+0x575/0x630 mm/filemap.c:3470
 do_iter_readv_writev+0x651/0x8e0 include/linux/fs.h:1887
 do_iter_write+0x180/0x590 fs/read_write.c:970
 vfs_iter_write+0x7c/0xa0 fs/read_write.c:983
 iter_file_splice_write+0x6d8/0xe20 fs/splice.c:746
 do_splice_from fs/splice.c:848 [inline]
 direct_splice_actor+0xf7/0x130 fs/splice.c:1020
 splice_direct_to_actor+0x463/0xac0 fs/splice.c:975
 do_splice_direct+0x200/0x330 fs/splice.c:1063
 do_sendfile+0x7e4/0xfd0 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1519 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0xfc/0x1b0 fs/read_write.c:1511
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: 03 00 00 48 29 f0 48 3d f8 12 00 00 76 7d 48 81 ec 08 10 00 00 48 89 ac 24 00 10 00 00 48 8d ac 24 00 10 00 00 48 8b 59 20 48 <85> db 75 67 48 8b b4 24 20 10 00 00 8b 8c 24 28 10 00 00 48 89 e7
RSP: 002b:00007fc2bb6a2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a639
RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00007fc2bb6a36d4
R13: 00000000004c85aa R14: 00000000004dec38 R15: 00000000ffffffff
INFO: task syz-executor.2:8781 blocked for more than 143 seconds.
      Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D27472  8781   8596 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x7b7/0xc30 kernel/sched/core.c:4078
 schedule+0x131/0x1e0 kernel/sched/core.c:4145
 io_schedule+0x8b/0x100 kernel/sched/core.c:5789
 wait_on_page_bit_common+0x918/0xc90 mm/filemap.c:1175
 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224
 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822
 truncate_inode_pages_range+0x119b/0x16e0 mm/truncate.c:448
 truncate_inode_pages mm/truncate.c:476 [inline]
 truncate_pagecache mm/truncate.c:817 [inline]
 truncate_setsize+0xd9/0x100 mm/truncate.c:842
 fat_setattr+0x8d4/0xd60 fs/fat/file.c:547
 notify_change+0xa27/0xe70 fs/attr.c:337
 do_truncate+0x194/0x230 fs/open.c:64
 handle_truncate fs/namei.c:2998 [inline]
 do_last fs/namei.c:3414 [inline]
 path_openat+0x2fe3/0x4420 fs/namei.c:3525
 do_filp_open+0x192/0x3d0 fs/namei.c:3555
 do_sys_open+0x29f/0x560 fs/open.c:1093
 ksys_open include/linux/syscalls.h:1385 [inline]
 __do_sys_creat fs/open.c:1151 [inline]
 __se_sys_creat fs/open.c:1149 [inline]
 __x64_sys_creat+0x65/0x70 fs/open.c:1149
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: 03 00 00 48 29 f0 48 3d f8 12 00 00 76 7d 48 81 ec 08 10 00 00 48 89 ac 24 00 10 00 00 48 8d ac 24 00 10 00 00 48 8b 59 20 48 <85> db 75 67 48 8b b4 24 20 10 00 00 8b 8c 24 28 10 00 00 48 89 e7
RSP: 002b:00007fc2bb681c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000700
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2bb6826d4
R13: 00000000004c0ee8 R14: 00000000004d3be0 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1072:
 #0: ffffffff888d3e40 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207
1 lock held by rsyslogd/7735:
 #0: ffff888097ba86a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
3 locks held by getty/7825:
 #0: ffff8880a3443b60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff8880a0695090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7826:
 #0: ffff88808964c3a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff8880a4da7090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7827:
 #0: ffff8880945fa660 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff8880953b4090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7828:
 #0: ffff8880a01ae3e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff8880a991b090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7829:
 #0: ffff8880a850fe20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff888098abb090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7830:
 #0: ffff888098c05420 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff888089656090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f2d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
3 locks held by getty/7831:
 #0: ffff8880a049c920 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x22f/0x2f0 fs/file.c:801
 #1: ffff88809a4c2090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
 #2: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.2/8779:
 #0: ffff88805067c428 (sb_writers#16){.+.+}, at: file_start_write include/linux/fs.h:2880 [inline]
 #0: ffff88805067c428 (sb_writers#16){.+.+}, at: do_sendfile+0x7c2/0xfd0 fs/read_write.c:1463
3 locks held by syz-executor.2/8781:
 #0: ffff88805067c428 (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1648 [inline]
 #0: ffff88805067c428 (sb_writers#16){.+.+}, at: mnt_want_write+0x4a/0xa0 fs/namespace.c:354
 #1: ffff8880a2b832d8 (&sb->s_type->i_mutex_key#23){+.+.}, at: inode_lock include/linux/fs.h:789 [inline]
 #1: ffff8880a2b832d8 (&sb->s_type->i_mutex_key#23){+.+.}, at: do_truncate+0x186/0x230 fs/open.c:62
 #2: ffff8880a2b83178 (&ei->truncate_lock){+.+.}, at: fat_setattr+0x8b9/0xd60 fs/fat/file.c:546

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1072 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0
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+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xbb9/0xbd0 kernel/hung_task.c:289
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60