linux-kernel - [syzbot] [squashfs?] [fuse?] INFO: task hung in truncate_inode_pages

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Message-ID: <000000000000611acc05fcac1bf5@google.com>
Date:   Sat, 27 May 2023 05:36:47 -0700
From:   syzbot <syzbot+dd00076bcf1ab8165aea@...kaller.appspotmail.com>
To:     brauner@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, miklos@...redi.hu,
        phillip@...ashfs.org.uk, squashfs-devel@...ts.sourceforge.net,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] [squashfs?] [fuse?] INFO: task hung in truncate_inode_pages_range
 (6)

Hello,

syzbot found the following issue on:

HEAD commit:    f1fcbaa18b28 Linux 6.4-rc2
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1505bb65280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3dc1cdd68141cdc3
dashboard link: https://syzkaller.appspot.com/bug?extid=dd00076bcf1ab8165aea
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=110c71d9280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1222c039280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9e1748cceea/disk-f1fcbaa1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6dea99343621/vmlinux-f1fcbaa1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f5a93f86012d/Image-f1fcbaa1.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/ebeba8fb1375/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dd00076bcf1ab8165aea@...kaller.appspotmail.com

INFO: task syz-executor176:6013 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc2-syzkaller-gf1fcbaa18b28 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor176 state:D stack:0     pid:6013  ppid:6011   flags:0x00000000
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x1368/0x23b8 kernel/sched/core.c:6669
 schedule+0xc4/0x170 kernel/sched/core.c:6745
 io_schedule+0x8c/0x12c kernel/sched/core.c:8979
 folio_wait_bit_common+0x65c/0xb90 mm/filemap.c:1301
 __folio_lock+0x2c/0x3c mm/filemap.c:1664
 folio_lock include/linux/pagemap.h:955 [inline]
 truncate_inode_pages_range+0x930/0xf74 mm/truncate.c:422
 truncate_inode_pages mm/truncate.c:449 [inline]
 truncate_inode_pages_final+0x90/0xc0 mm/truncate.c:484
 evict+0x26c/0x68c fs/inode.c:667
 dispose_list fs/inode.c:698 [inline]
 evict_inodes+0x6b4/0x74c fs/inode.c:748
 generic_shutdown_super+0x9c/0x328 fs/super.c:479
 kill_block_super+0x70/0xdc fs/super.c:1407
 deactivate_locked_super+0xac/0x124 fs/super.c:331
 deactivate_super+0xe0/0x100 fs/super.c:362
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1177
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1184
 task_work_run+0x230/0x2e0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1304
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x90/0x15c arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffff8000160810d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
 #0: ffff800016081490 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/28:
 #0: ffff800016080f00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:326
2 locks held by getty/5728:
 #0: ffff0000dab28098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80001ae462f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2176
1 lock held by syz-executor176/6013:
 #0: ffff0000c99160e0 (&type->s_umount_key#41){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:361

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



---
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