Message-ID: <000000000000f987ff06164db4f6@google.com>
Date: Wed, 17 Apr 2024 09:54:24 -0700
From: syzbot <syzbot+dbb72d38131e90dc1f66@...kaller.appspotmail.com>
To: agruenba@...hat.com, gfs2@...ts.linux.dev, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [gfs2?] INFO: task hung in gfs2_glock_nq

Hello,

syzbot found the following issue on:

HEAD commit:    b5d2afe8745b Merge branches 'for-next/kbuild', 'for-next/m..
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=139e600b180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=560f5db1d0b3f6d0
dashboard link: https://syzkaller.appspot.com/bug?extid=dbb72d38131e90dc1f66
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1745f177180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17509b6d180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/50bff35e1638/disk-b5d2afe8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4eeaa73e7ed1/vmlinux-b5d2afe8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8e796b089aa9/Image-b5d2afe8.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3f56655953c4/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dbb72d38131e90dc1f66@...kaller.appspotmail.com

INFO: task syz-executor105:6284 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc3-syzkaller-gb5d2afe8745b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor105 state:D stack:0     pid:6284  tgid:6284  ppid:6282   flags:0x00000004
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x14bc/0x24ec kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6838
 bit_wait+0x1c/0xac kernel/sched/wait_bit.c:199
 __wait_on_bit kernel/sched/wait_bit.c:49 [inline]
 out_of_line_wait_on_bit+0x208/0x334 kernel/sched/wait_bit.c:64
 wait_on_bit include/linux/wait_bit.h:76 [inline]
 gfs2_glock_wait+0xb8/0x298 fs/gfs2/glock.c:1354
 gfs2_glock_nq+0xcc8/0x169c fs/gfs2/glock.c:1616
 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline]
 __gfs2_lookup+0x124/0x270 fs/gfs2/inode.c:905
 gfs2_lookup+0x2c/0x3c fs/gfs2/inode.c:930
 __lookup_slow+0x250/0x374 fs/namei.c:1692
 lookup_slow+0x60/0x84 fs/namei.c:1709
 walk_component+0x280/0x36c fs/namei.c:2004
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2485
 filename_lookup+0x1d4/0x4e0 fs/namei.c:2514
 user_path_at_empty+0x5c/0x84 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1916 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1922
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffff80008f057880 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:328
2 locks held by getty/6006:
 #0: ffff0000ccbde0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800097b9b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201
1 lock held by syz-executor105/6284:
 #0: ffff0000df4da9a0 (&type->i_mutex_dir_key#6){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:805 [inline]
 #0: ffff0000df4da9a0 (&type->i_mutex_dir_key#6){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1708

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



---
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