INFO: task hung in sync_inodes_sb (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 03430750 Add linux-next specific files for 20201116
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17027fdc500000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1c4c3f27041fdb8
dashboard link: https://syzkaller.appspot.com/bug?extid=7d50f1e54a12ba3aeae2
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124a8841500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a4fce2500000

The issue was bisected to:

commit c68df2e7be0c1238ea3c281fd744a204ef3b15a0
Author: Emmanuel Grumbach <emmanuel...@intel.com>
Date: Thu Sep 15 13:30:02 2016 +0000

mac80211: allow using AP_LINK_PS with mac80211-generated TIM IE

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1445e981500000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1645e981500000
console output: https://syzkaller.appspot.com/x/log.txt?x=1245e981500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7d50f1...@syzkaller.appspotmail.com
Fixes: c68df2e7be0c ("mac80211: allow using AP_LINK_PS with mac80211-generated TIM IE")

INFO: task syz-executor017:8513 blocked for more than 143 seconds.
Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor017 state:D stack:27448 pid: 8513 ppid: 8507 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4269 [inline]
__schedule+0x890/0x2030 kernel/sched/core.c:5019
schedule+0xcf/0x270 kernel/sched/core.c:5098
wb_wait_for_completion+0x17b/0x230 fs/fs-writeback.c:209
sync_inodes_sb+0x1a6/0x9d0 fs/fs-writeback.c:2559
__sync_filesystem fs/sync.c:34 [inline]
sync_filesystem fs/sync.c:67 [inline]
sync_filesystem+0x15c/0x260 fs/sync.c:48
generic_shutdown_super+0x70/0x370 fs/super.c:448
kill_block_super+0x97/0xf0 fs/super.c:1446
deactivate_locked_super+0x94/0x160 fs/super.c:335
deactivate_super+0xad/0xd0 fs/super.c:366
cleanup_mnt+0x3a3/0x530 fs/namespace.c:1123
task_work_run+0xdd/0x190 kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44e0e7
Code: Unable to access opcode bytes at RIP 0x44e0bd.
RSP: 002b:00007fff42061288 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00000000000cee4c RCX: 000000000044e0e7
RDX: 0000000000400be0 RSI: 0000000000000002 RDI: 00007fff42061330
RBP: 0000000000002142 R08: 0000000000000000 R09: 0000000000000009
R10: 0000000000000005 R11: 0000000000000206 R12: 00007fff420623e0
R13: 0000000001f67880 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
2 locks held by kworker/u4:5/225:
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff8881413a4138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc9000191fda8 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
1 lock held by khungtaskd/1655:
#0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
1 lock held by in:imklog/8188:
#0: ffff888017c8f4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
2 locks held by syz-executor017/8513:
#0: ffff88801a8500e0 (&type->s_umount_key#49){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365
#1: ffff888143f5e708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:344 [inline]
#1: ffff888143f5e708 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x18c/0x9d0 fs/fs-writeback.c:2557

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

NMI backtrace for cpu 0
CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc3-next-20201116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:338
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:517


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