INFO: task kworker/u4:5:1283 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:5    state:D stack:24312 pid: 1283 ppid:     2 flags:0x00004000
Workqueue: events_unbound quota_release_workfn
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
 do_wait_for_common+0x2a2/0x450 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 __synchronize_srcu+0x2bb/0x350 kernel/rcu/srcutree.c:930
 quota_release_workfn+0x106/0x610 fs/quota/dquot.c:828
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
INFO: task syz.0.17:4370 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:21200 pid: 4370 ppid:  4305 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
 bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xbc/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x138/0x190 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:402 [inline]
 ext4_quota_write+0x36d/0x580 fs/ext4/super.c:6636
 qtree_write_dquot+0x203/0x4b0 fs/quota/quota_tree.c:422
 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:358
 dquot_commit+0x34b/0x410 fs/quota/dquot.c:514
 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6210
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
 dquot_alloc_inode+0x717/0x9c0 fs/quota/dquot.c:1801
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:866 [inline]
 ext4_xattr_set_entry+0xfb2/0x3ea0 fs/ext4/xattr.c:1669
 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1924
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
 __do_sys_setxattr fs/xattr.c:646 [inline]
 __se_sys_setxattr fs/xattr.c:642 [inline]
 __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff88df54f79
RSP: 002b:00007ffff2fd5188 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007ff88e1cefa0 RCX: 00007ff88df54f79
RDX: 0000200000000380 RSI: 0000200000000340 RDI: 00002000000002c0
RBP: 00007ff88dfeb7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff88e1cefac R14: 00007ff88e1cefa0 R15: 00007ff88e1cefa0
 </TASK>
INFO: task syz.1.18:4375 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18        state:D stack:21840 pid: 4375 ppid:  4310 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
 bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xbc/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x138/0x190 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:402 [inline]
 ext4_quota_write+0x36d/0x580 fs/ext4/super.c:6636
 qtree_write_dquot+0x203/0x4b0 fs/quota/quota_tree.c:422
 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:358
 dquot_commit+0x34b/0x410 fs/quota/dquot.c:514
 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6210
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
 dquot_alloc_inode+0x717/0x9c0 fs/quota/dquot.c:1801
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:866 [inline]
 ext4_xattr_set_entry+0xfb2/0x3ea0 fs/ext4/xattr.c:1669
 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1924
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
 __do_sys_setxattr fs/xattr.c:646 [inline]
 __se_sys_setxattr fs/xattr.c:642 [inline]
 __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f759b577f79
RSP: 002b:00007fff25026b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f759b7f1fa0 RCX: 00007f759b577f79
RDX: 0000200000000380 RSI: 0000200000000340 RDI: 00002000000002c0
RBP: 00007f759b60e7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 00007f759b7f1fac R14: 00007f759b7f1fa0 R15: 00007f759b7f1fa0
 </TASK>
INFO: task syz.2.19:4423 blocked for more than 148 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:21840 pid: 4423 ppid:  4313 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
 bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xbc/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x138/0x190 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:402 [inline]
 ext4_quota_write+0x36d/0x580 fs/ext4/super.c:6636
 qtree_write_dquot+0x203/0x4b0 fs/quota/quota_tree.c:422
 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:358
 dquot_commit+0x34b/0x410 fs/quota/dquot.c:514
 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6210
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
 dquot_alloc_inode+0x717/0x9c0 fs/quota/dquot.c:1801
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:866 [inline]
 ext4_xattr_set_entry+0xfb2/0x3ea0 fs/ext4/xattr.c:1669
 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1924
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
 __do_sys_setxattr fs/xattr.c:646 [inline]
 __se_sys_setxattr fs/xattr.c:642 [inline]
 __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5fef985f79
RSP: 002b:00007ffe64b589c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f5fefbfffa0 RCX: 00007f5fef985f79
RDX: 0000200000000380 RSI: 0000200000000340 RDI: 00002000000002c0
RBP: 00007f5fefa1c7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5fefbfffac R14: 00007f5fefbfffa0 R15: 00007f5fefbfffa0
 </TASK>
INFO: task syz.3.20:4427 blocked for more than 150 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:21840 pid: 4427 ppid:  4311 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
 bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xbc/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x138/0x190 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:402 [inline]
 ext4_quota_write+0x36d/0x580 fs/ext4/super.c:6636
 qtree_write_dquot+0x203/0x4b0 fs/quota/quota_tree.c:422
 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:358
 dquot_commit+0x34b/0x410 fs/quota/dquot.c:514
 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6210
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
 dquot_alloc_inode+0x717/0x9c0 fs/quota/dquot.c:1801
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:866 [inline]
 ext4_xattr_set_entry+0xfb2/0x3ea0 fs/ext4/xattr.c:1669
 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1924
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
 __do_sys_setxattr fs/xattr.c:646 [inline]
 __se_sys_setxattr fs/xattr.c:642 [inline]
 __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd95167ff79
RSP: 002b:00007ffc0544e918 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fd9518f9fa0 RCX: 00007fd95167ff79
RDX: 0000200000000380 RSI: 0000200000000340 RDI: 00002000000002c0
RBP: 00007fd9517167e0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd9518f9fac R14: 00007fd9518f9fa0 R15: 00007fd9518f9fa0
 </TASK>
INFO: task syz.4.21:4430 blocked for more than 152 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.21        state:D stack:21840 pid: 4430 ppid:  4318 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
 bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xbc/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x138/0x190 kernel/sched/wait_bit.c:117