Message-ID: <CACT4Y+Yw3agMNYeWB2QMHfnFtQKbq0T3iQK6YMmGapF2kjBp=Q@mail.gmail.com>
Date:   Thu, 31 Mar 2022 07:46:54 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+4631483f85171c561f39@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] BUG: scheduling while atomic: syz-fuzzer/NUM/ADDR

On Wed, 30 Mar 2022 at 19:42, syzbot
<syzbot+4631483f85171c561f39@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    f022814633e1 Merge tag 'trace-v5.18-1' of git://git.kernel..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1511883d700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2f78c0e92b7fea54
> dashboard link: https://syzkaller.appspot.com/bug?extid=4631483f85171c561f39
> compiler:       aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64

The same as:
#syz dup: BUG: scheduling while atomic in simple_recursive_removal

This only happens on arm32/64 instances.


> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4631483f85171c561f39@...kaller.appspotmail.com
>
> BUG: scheduling while atomic: syz-fuzzer/2188/0x00000101
> Modules linked in:
> CPU: 0 PID: 2188 Comm: syz-fuzzer Not tainted 5.17.0-syzkaller-11138-gf022814633e1 #0
> Hardware name: linux,dummy-virt (DT)
> Call trace:
>  dump_backtrace.part.0+0xcc/0xe0 arch/arm64/kernel/stacktrace.c:184
>  dump_backtrace arch/arm64/kernel/stacktrace.c:190 [inline]
>  show_stack+0x18/0x6c arch/arm64/kernel/stacktrace.c:191
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106
>  dump_stack+0x18/0x34 lib/dump_stack.c:113
>  __schedule_bug+0x60/0x80 kernel/sched/core.c:5617
>  schedule_debug kernel/sched/core.c:5644 [inline]
>  __schedule+0x74c/0x7f0 kernel/sched/core.c:6273
>  schedule+0x54/0xd0 kernel/sched/core.c:6454
>  rwsem_down_write_slowpath+0x29c/0x5a0 kernel/locking/rwsem.c:1142
>  __down_write_common kernel/locking/rwsem.c:1259 [inline]
>  __down_write_common kernel/locking/rwsem.c:1256 [inline]
>  __down_write kernel/locking/rwsem.c:1268 [inline]
>  down_write+0x58/0x64 kernel/locking/rwsem.c:1515
>  inode_lock include/linux/fs.h:777 [inline]
>  simple_recursive_removal+0x124/0x270 fs/libfs.c:288
>  debugfs_remove fs/debugfs/inode.c:732 [inline]
>  debugfs_remove+0x5c/0x80 fs/debugfs/inode.c:726
>  blk_release_queue+0x7c/0xf0 block/blk-sysfs.c:784
>  kobject_cleanup lib/kobject.c:705 [inline]
>  kobject_release lib/kobject.c:736 [inline]
>  kref_put include/linux/kref.h:65 [inline]
>  kobject_put+0x98/0x114 lib/kobject.c:753
>  blk_put_queue+0x14/0x20 block/blk-core.c:270
>  blkg_free.part.0+0x54/0x80 block/blk-cgroup.c:86
>  blkg_free block/blk-cgroup.c:78 [inline]
>  __blkg_release+0x44/0x70 block/blk-cgroup.c:102
>  rcu_do_batch kernel/rcu/tree.c:2535 [inline]
>  rcu_core+0x324/0x590 kernel/rcu/tree.c:2786
>  rcu_core_si+0x10/0x20 kernel/rcu/tree.c:2803
>  _stext+0x124/0x2a0
>  do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
>  invoke_softirq kernel/softirq.c:439 [inline]
>  __irq_exit_rcu+0xe4/0x100 kernel/softirq.c:637
>  irq_exit_rcu+0x10/0x1c kernel/softirq.c:649
>  el0_interrupt+0x6c/0x104 arch/arm64/kernel/entry-common.c:693
>  __el0_irq_handler_common+0x18/0x2c arch/arm64/kernel/entry-common.c:700
>  el0t_64_irq_handler+0x10/0x20 arch/arm64/kernel/entry-common.c:705
>  el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:582
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 13 at kernel/rcu/tree.c:2592 rcu_do_batch kernel/rcu/tree.c:2592 [inline]
> WARNING: CPU: 0 PID: 13 at kernel/rcu/tree.c:2592 rcu_core+0x4d4/0x590 kernel/rcu/tree.c:2786
> Modules linked in:
> CPU: 0 PID: 13 Comm: ksoftirqd/0 Tainted: G        W         5.17.0-syzkaller-11138-gf022814633e1 #0
> Hardware name: linux,dummy-virt (DT)
> pstate: a04000c9 (NzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : rcu_do_batch kernel/rcu/tree.c:2592 [inline]
> pc : rcu_core+0x4d4/0x590 kernel/rcu/tree.c:2786
> lr : rcu_do_batch kernel/rcu/tree.c:2572 [inline]
> lr : rcu_core+0x38c/0x590 kernel/rcu/tree.c:2786
> sp : ffff80000a69bd00
> x29: ffff80000a69bd00 x28: ffff800008121498 x27: 0000000000000000
> x26: 000000000000000a x25: fffffffffffffffd x24: ffff80000a69bd60
> x23: ffff80000a36cc00 x22: ffff00007fbc39b8 x21: 0000000000000000
> x20: ffff00007fbc3940 x19: 0000000000000000 x18: 0000000000000014
> x17: ffff800075981000 x16: ffff800008004000 x15: 000002fbb92ae146
> x14: 00000000000000c7 x13: 00000000000000c7 x12: ffff800009e7d710
> x11: ffff80000a25fee8 x10: ffff800075981000 x9 : 5759a1e949bd4693
> x8 : ffff8000080102a0 x7 : ffff80000a69b9e4 x6 : 00000000002e47d8
> x5 : f1ff00002157a500 x4 : ffff00007fbc75a0 x3 : 00000000002e47e0
> x2 : 0000000000002710 x1 : ffffffffffffd8f0 x0 : 0000000000000001
> Call trace:
>  rcu_do_batch kernel/rcu/tree.c:2592 [inline]
>  rcu_core+0x4d4/0x590 kernel/rcu/tree.c:2786
>  rcu_core_si+0x10/0x20 kernel/rcu/tree.c:2803
>  _stext+0x124/0x2a0
>  run_ksoftirqd+0x4c/0x60 kernel/softirq.c:921
>  smpboot_thread_fn+0x23c/0x270 kernel/smpboot.c:164
>  kthread+0x108/0x10c kernel/kthread.c:376
>  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:867
> ---[ end trace 0000000000000000 ]---
>
>
> ---
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>
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