Message-ID: <0000000000002475cc0605736cf8@google.com>
Date:   Fri, 15 Sep 2023 22:45:53 -0700
From:   syzbot <syzbot+bae3c73c7bf2fe3a740b@...kaller.appspotmail.com>
To:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [block?] INFO: task hung in truncate_inode_pages

Hello,

syzbot found the following issue on:

HEAD commit:    0bb80ecc33a8 Linux 6.6-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=174f44e8680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f7435f9f9f66fcd9
dashboard link: https://syzkaller.appspot.com/bug?extid=bae3c73c7bf2fe3a740b
compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1381f8d8680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1365c2a0680000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-0bb80ecc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fa2698d36fcb/vmlinux-0bb80ecc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/077f03e6d621/Image-0bb80ecc.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bae3c73c7bf2fe3a740b@...kaller.appspotmail.com

INFO: task udevd:3125 blocked for more than 450 seconds.
      Not tainted 6.6.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:0     pid:3125  ppid:2924   flags:0x0000000d
Call trace:
 __switch_to+0x1d0/0x348 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xac4/0x2ae4 kernel/sched/core.c:6695
 schedule+0xc8/0x19c kernel/sched/core.c:6771
 io_schedule+0xac/0x114 kernel/sched/core.c:9026
 folio_wait_bit_common+0x2a8/0x6d8 mm/filemap.c:1301
 __folio_lock mm/filemap.c:1629 [inline]
 folio_lock include/linux/pagemap.h:1042 [inline]
 folio_lock include/linux/pagemap.h:1038 [inline]
 __filemap_get_folio+0x418/0x840 mm/filemap.c:1882
 truncate_inode_pages_range+0x270/0xb4c mm/truncate.c:376
 truncate_inode_pages+0x14/0x20 mm/truncate.c:448
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0x100/0x250 block/bdev.c:630
 blkdev_put_whole+0xd4/0xf0 block/bdev.c:661
 blkdev_put+0x284/0x6a8 block/bdev.c:898
 blkdev_release+0x74/0xa8 block/fops.c:604
 __fput+0x2a8/0x830 fs/file_table.c:384
 ____fput+0x10/0x1c fs/file_table.c:412
 task_work_run+0x124/0x20c kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x75c/0x1ecc kernel/exit.c:874
 do_group_exit+0xa4/0x208 kernel/exit.c:1024
 get_signal+0x19a4/0x1ae8 kernel/signal.c:2892
 do_signal arch/arm64/kernel/signal.c:1249 [inline]
 do_notify_resume+0x480/0x3028 arch/arm64/kernel/signal.c:1302
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline]
 el0_svc+0x11c/0x140 arch/arm64/kernel/entry-common.c:679
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
INFO: task syz-executor137:3128 blocked for more than 450 seconds.
      Not tainted 6.6.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor137 state:D stack:0     pid:3128  ppid:3121   flags:0x00000005
Call trace:
 __switch_to+0x1d0/0x348 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xac4/0x2ae4 kernel/sched/core.c:6695
 schedule+0xc8/0x19c kernel/sched/core.c:6771
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6830
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:747
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:799
 blkdev_get_by_dev.part.0+0x3ec/0x810 block/bdev.c:786
 blkdev_get_by_dev+0x68/0x7c block/bdev.c:829
 blkdev_open+0xec/0x288 block/fops.c:589
 do_dentry_open+0x4e8/0x1138 fs/open.c:929
 vfs_open+0x90/0xc8 fs/open.c:1063
 do_open fs/namei.c:3639 [inline]
 path_openat+0x1488/0x2058 fs/namei.c:3796
 do_filp_open+0x16c/0x330 fs/namei.c:3823
 do_sys_openat2+0x12c/0x160 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __arm64_sys_openat+0x12c/0x1b8 fs/open.c:1448
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x58/0x140 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
INFO: lockdep is turned off.


---
This report is generated by a bot. It may contain errors.
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If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
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If you want to overwrite bug's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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