linux-kernel - [syzbot] BUG: sleeping function called from invalid context in __xas

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Date:   Tue, 12 Jul 2022 05:03:25 -0700
From:   syzbot <syzbot+b355e80670ac28f5263c@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] BUG: sleeping function called from invalid context in __xas_nomem

Hello,

syzbot found the following issue on:

HEAD commit:    8e59a6a7a4fa Merge tag 'mm-hotfixes-stable-2022-07-11' of ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a10ac8080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f58350a1f5f99e22
dashboard link: https://syzkaller.appspot.com/bug?extid=b355e80670ac28f5263c
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+b355e80670ac28f5263c@...kaller.appspotmail.com

BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 10059, name: syz-executor.3
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
2 locks held by syz-executor.3/10059:
 #0: ffff888014c5e0e0 (&type->s_umount_key#70/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xa80 fs/super.c:228
 #1: ffff8880259280c0 (&fs_info->fs_roots_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
 #1: ffff8880259280c0 (&fs_info->fs_roots_lock){+.+.}-{2:2}, at: btrfs_insert_fs_root+0x78/0x2e0 fs/btrfs/disk-io.c:1708
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 10059 Comm: syz-executor.3 Not tainted 5.19.0-rc6-syzkaller-00019-g8e59a6a7a4fa #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9821
 might_alloc include/linux/sched/mm.h:274 [inline]
 slab_pre_alloc_hook mm/slab.h:723 [inline]
 slab_alloc mm/slab.c:3285 [inline]
 __kmem_cache_alloc_lru mm/slab.c:3479 [inline]
 kmem_cache_alloc_lru+0x41b/0x8c0 mm/slab.c:3506
 __xas_nomem+0x263/0x670 lib/xarray.c:340
 __xa_insert+0x122/0x250 lib/xarray.c:1662
 xa_insert include/linux/xarray.h:774 [inline]
 btrfs_insert_fs_root+0xf7/0x2e0 fs/btrfs/disk-io.c:1709
 btrfs_get_root_ref.part.0+0x820/0xb80 fs/btrfs/disk-io.c:1855
 btrfs_get_root_ref fs/btrfs/disk-io.c:1809 [inline]
 btrfs_get_fs_root fs/btrfs/disk-io.c:1887 [inline]
 btrfs_read_roots fs/btrfs/disk-io.c:2725 [inline]
 init_tree_roots fs/btrfs/disk-io.c:3111 [inline]
 open_ctree+0x2d88/0x49d3 fs/btrfs/disk-io.c:3736
 btrfs_fill_super fs/btrfs/super.c:1455 [inline]
 btrfs_mount_root.cold+0x15/0x162 fs/btrfs/super.c:1821
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 fc_mount fs/namespace.c:1043 [inline]
 vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1073
 vfs_kern_mount+0x3c/0x60 fs/namespace.c:1060
 btrfs_mount+0x234/0xa60 fs/btrfs/super.c:1881
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f14e7c8a63a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f14e6bfdf88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f14e7c8a63a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f14e6bfdfe0
RBP: 00007f14e6bfe020 R08: 00007f14e6bfe020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f14e6bfdfe0 R15: 0000000020016800
 </TASK>
BTRFS info (device loop3): enabling ssd optimizations


---
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