[syzbot] [nbd?] possible deadlock in nbd_ioctl
Hello,
syzbot found the following issue on:
HEAD commit: 4cb6c8af8591 selftests/filesystems: Fix build of anon_inod..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=101dbed4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4db24c5f80c69f73
dashboard link: https://syzkaller.appspot.com/bug?extid=7f46fdd7673b5fec63ac
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-4cb6c8af.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/03a3203c4877/vmlinux-4cb6c8af.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5da3a32140dd/bzImage-4cb6c8af.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7f46fdd7673b5fec63ac@syzkaller.appspotmail.com
��z j�z/w$��(>��T �|�h����3 �� 7�`(*����x�k"�GzR����AoO�ź�:m@dc�~້��]�F#���<���H�K�S�_ }� �&4�ҽ�:� B�@Y�a��H{�I��ȃ�1�/�t�683�-�H�Ӈ՟O�6d��g;��z���G�X�4W�6B�g���\�"\�V[1�C� � c��[H+���Q�K��l�,NJ��Tt0 � ��O3 �~�7�T7�i�[ 234.907471][T11482]
���BJ* M�<O[ 234.908368][T11482] ======================================================
�b�4�2٬ �x/��[ 234.911186][T11482] WARNING: possible circular locking dependency detected
ϭ�:+��މ��3l"0�[ 234.913886][T11482] 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 Not tainted
Z��d�O#��̵G<'�[ 234.917367][T11482] ------------------------------------------------------
-�P�%�p���mxB?=[ 234.921230][T11482] syz.2.1726/11482 is trying to acquire lock:
̞ �K��;���m$[ 234.947847][T11482] nbd_config_put+0x31/0x750 drivers/block/nbd.c:1423
8������I@�;��͊[ 234.950419][T11482] nbd_release+0xb7/0x190 drivers/block/nbd.c:1735
rmDD"�����eр>w[ 234.952630][T11482] blkdev_put_whole+0xad/0xf0 block/bdev.c:721
��j&/ oc���i�!i[ 234.954759][T11482] bdev_release+0x47e/0x6d0 block/bdev.c:1144
�P_yQ2�3@�� S�[ 234.956801][T11482] blkdev_release+0x15/0x20 block/fops.c:684
v��yAe] Q3�L.��p[ 234.958866][T11482] __fput+0x402/0xb70 fs/file_table.c:465
9^�:��l�� �~�[ 234.960790][T11482] fput_close_sync+0x118/0x260 fs/file_table.c:570
X����z��~M��&[ 234.963382][T11482] __do_sys_close fs/open.c:1589 [inline]
X����z��~M��&[ 234.963382][T11482] __se_sys_close fs/open.c:1574 [inline]
X����z��~M��&[ 234.963382][T11482] __x64_sys_close+0x8b/0x120 fs/open.c:1574
H~�h� !�c�N'�[ 234.965568][T11482] do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
H~�h� !�c�N'�[ 234.965568][T11482] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
оZ8í �a���πL[ 234.967679][T11482] entry_SYSCALL_64_after_hwframe+0x77/0x7f
R�%�(ޅ��]��Z[ 234.970149][T11482]
G��Ӆ�Ԗ��j�[ 234.973111][T11482] __mutex_lock_common kernel/locking/mutex.c:601 [inline]
G��Ӆ�Ԗ��j�[ 234.973111][T11482] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
���3��D ��C9 �[ 234.975247][T11482] __del_gendisk+0xf5/0xbd0 block/genhd.c:706
���R8� M�2�xZ��[ 234.977457][T11482] del_gendisk+0x13e/0x1e0 block/genhd.c:819
b��%�#R��|f���[ 234.979465][T11482] loop_remove drivers/block/loop.c:2081 [inline]
b��%�#R��|f���[ 234.979465][T11482] loop_control_remove drivers/block/loop.c:2140 [inline]
b��%�#R��|f���[ 234.979465][T11482] loop_control_ioctl+0x4eb/0x630 drivers/block/loop.c:2178
��䷓�l_I��\G_b[ 234.981839][T11482] __do_compat_sys_ioctl fs/ioctl.c:1005 [inline]
��䷓�l_I��\G_b[ 234.981839][T11482] __se_compat_sys_ioctl fs/ioctl.c:948 [inline]
��䷓�l_I��\G_b[ 234.981839][T11482] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:948
�h�Vi��?�NfgV�Bp[ 234.984163][T11482] do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
�h�Vi��?�NfgV�Bp[ 234.984163][T11482] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
I+� �h9�?�� [ 234.986400][T11482] do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
�Mv�s����>�'�p�[ 234.988602][T11482] entry_SYSENTER_compat_after_hwframe+0x84/0x8e
MX�sQ�.�`��l�[ 234.991286][T11482]
q�x��I���z4Rg[�[ 234.994371][T11482] check_prev_add kernel/locking/lockdep.c:3168 [inline]
q�x��I���z4Rg[�[ 234.994371][T11482] check_prevs_add kernel/locking/lockdep.c:3287 [inline]
q�x��I���z4Rg[�[ 234.994371][T11482] validate_chain kernel/locking/lockdep.c:3911 [inline]
q�x��I���z4Rg[�[ 234.994371][T11482] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240
Ҫa_�^�AHz��z/[ 234.996519][T11482] lock_acquire kernel/locking/lockdep.c:5871 [inline]
Ҫa_�^�AHz��z/[ 234.996519][T11482] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
f�2=ah��eRW����[ 234.998553][T11482] down_write+0x92/0x200 kernel/locking/rwsem.c:1577
5:
&�6�k,c����[ 235.000504][T11482] blk_mq_update_nr_hw_queues+0x32/0xcb0 block/blk-mq.c:5041
�#��VIVHF���[ 235.002954][T11482] nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476
`�����
�W�[ 235.005099][T11482] nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline]
�W�[ 235.005099][T11482] __nbd_ioctl drivers/block/nbd.c:1602 [inline]
�W�[ 235.005099][T11482] nbd_ioctl+0x219/0xda0 drivers/block/nbd.c:1642
Vo&W��l����Iir��[ 235.007199][T11482] compat_blkdev_ioctl+0x2ee/0x7a0 block/ioctl.c:760
�����d�c��� �[ 235.009416][T11482] __do_compat_sys_ioctl fs/ioctl.c:1005 [inline]
�����d�c��� �[ 235.009416][T11482] __se_compat_sys_ioctl fs/ioctl.c:948 [inline]
�����d�c��� �[ 235.009416][T11482] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:948
�2�-����e�d[ 235.011817][T11482] do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
�2�-����e�d[ 235.011817][T11482] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
��D�*��.=�8[ 235.014044][T11482] do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
��;� �?�w����1)[ 235.016183][T11482] entry_SYSENTER_compat_after_hwframe+0x84/0x8e
n�߱[�uy�S W��q�[ 235.018768][T11482]
��5�'Zb�ʌ��0y�m[ 235.022468][T11482] Chain exists of:
:��}kk�� |�V�[ 235.027258][T11482] Possible unsafe locking scenario:
ג;�%�+� l�;�H[ 235.030064][T11482] CPU0 CPU1
���#�� o�F� ��J[ 235.032316][T11482] ---- ----
�;��
!Yg��e4[ 235.034467][T11482] lock(&nbd->config_lock);
���<;�ύ����#~�[ 235.036367][T11482] lock(&disk->open_mutex);
���Op�L�}q�(Q� �[ 235.039016][T11482] lock(&nbd->config_lock);
;��gj<�� � N%��[ 235.041733][T11482] lock(&set->update_nr_hwq_lock);
Q�=@�~NHN߄0�4[ 235.043812][T11482]
�� ����gū���[ 235.046785][T11482] 1 lock held by syz.2.1726/11482:
G�,S0l�,��Ðwm"[ 235.048846][T11482] #0: ffff888022f0b230 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x150/0xda0 drivers/block/nbd.c:1635
;����o���� 涠[ 235.052525][T11482]
`��H�7��v�����I�j϶U�( ������[ 235.055507][T11482] CPU: 0 UID: 0 PID: 11482 Comm: syz.2.1726 Not tainted 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 PREEMPT(full)
c�ޗ�Y�m�O[�A�[ 235.055528][T11482] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
�Yɜ�0π`��;�W�[ 235.055536][T11482] Call Trace:
�d����!�xX~# ���[ 235.055541][T11482] <TASK>
��; �����`VH�[ 235.055547][T11482] __dump_stack lib/dump_stack.c:94 [inline]
��; �����`VH�[ 235.055547][T11482] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
dU����+�� *�[ 235.055563][T11482] print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046
us����^[6;מ�9[<[ 235.055603][T11482] check_prev_add kernel/locking/lockdep.c:3168 [inline]
us����^[6;מ�9[<[ 235.055603][T11482] check_prevs_add kernel/locking/lockdep.c:3287 [inline]
us����^[6;מ�9[<[ 235.055603][T11482] validate_chain kernel/locking/lockdep.c:3911 [inline]
us����^[6;מ�9[<[ 235.055603][T11482] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240
�����*I41�=��[ 235.055617][T11482] lock_acquire kernel/locking/lockdep.c:5871 [inline]
�����*I41�=��[ 235.055617][T11482] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
E0�A��ϝ���Pn��][ 235.055645][T11482] ? __pfx___might_resched+0x10/0x10 kernel/sched/core.c:5899
�-�Y�����͌��@z=[ 235.055677][T11482] down_write+0x92/0x200 kernel/locking/rwsem.c:1577
�����8���ސ�[ 235.055690][T11482] ? blk_mq_update_nr_hw_queues+0x32/0xcb0 block/blk-mq.c:5041
�[w��+����ؿ�bMU[ 235.055718][T11482] ? __mutex_lock_common kernel/locking/mutex.c:611 [inline]
�[w��+����ؿ�bMU[ 235.055718][T11482] ? __mutex_lock+0x1ca/0xb90 kernel/locking/mutex.c:746
l����e*�4x� [ 235.055752][T11482] blk_mq_update_nr_hw_queues+0x32/0xcb0 block/blk-mq.c:5041
���8�X��p�|&�d_[ 235.055767][T11482] ? __pfx___mutex_lock+0x10/0x10 usercopy_64.c:-1
ʚֵ�����->�E�[ 235.055797][T11482] nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476
�k]�Pת� _pv��[ 235.055814][T11482] ? bpf_lsm_capable+0x9/0x10 include/linux/lsm_hook_defs.h:44
S.��R��^�fx,^[ 235.055843][T11482] ? __pfx_nbd_ioctl+0x10/0x10 drivers/block/nbd.c:828
�}m�V�5p/ӯ��Y[ 235.055862][T11482] ? find_held_lock+0x2b/0x80 kernel/locking/lockdep.c:5353
N�ǐ� S� 9i`�P[ 235.055891][T11482] compat_blkdev_ioctl+0x2ee/0x7a0 block/ioctl.c:760
�!�(�m[,|"���F[ 235.055904][T11482] ? __pfx_compat_blkdev_ioctl+0x10/0x10 block/ioctl.c:702
��w]�e�4w�~��h[ 235.055931][T11482] __do_compat_sys_ioctl fs/ioctl.c:1005 [inline]
��w]�e�4w�~��h[ 235.055931][T11482] __se_compat_sys_ioctl fs/ioctl.c:948 [inline]
��w]�e�4w�~��h[ 235.055931][T11482] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:948
���29 ����b�ڬ[ 235.055950][T11482] do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
���29 ����b�ڬ[ 235.055950][T11482] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
@�ׯ�? ��T���[ 235.055964][T11482] do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
�R���>K���yZ+bt[ 235.055977][T11482] entry_SYSENTER_compat_after_hwframe+0x84/0x8e
�ڞ W��-bQ�Պ [ 235.055992][T11482] RIP: 0023:0xf7fc5579
~�f�i �hv�^��|/[ 235.056012][T11482] RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
�x�$,Y��� 㣖[ 235.056023][T11482] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000ab03
�A��ɴ�V�G�HL[ 235.056030][T11482] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
SMK��*S u���[ 235.056036][T11482] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
L��ݭ�8*�1m&��Q�[ 235.056049][T11482] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
�pϿ5��=�X�����
�:==�B>];�oF���� j�+�X��s�m�ogI�OP 瀎���p�=w���� �姩!z��� [ȭ�ׂG$�[ �niUJ�\�BǯJ���z��䐲�G��YE�]Apaxe� �&1]�/h�KDRkZ*��E�k7�ܪc� , �k*�u?'��rϓkV}'r�e��SJ�ަkpᄔ�����R��� ��$�H$��. ā<W�G@�?^�'��!�a�)� 鈏}�"�ܩ�X�xɉR� G�B;����j �a:N���!�&���8���B��r��S��|'V~z04`e��� ��u*�wB�J�ѻQ͇b���H12��$��saئr����q�{SαE��M�<� �?��N��1�j ҳձ�D�%�K�K� �_�рmLؒ�Yͼ_�QM��㇡�;\��*Pt��3�+��|����Sn�� l�?�(�CG���v_0 ��ؔ��٧x��}"�-R�!��O��k/�S����w��&��]-z��~� �L �/'� A�T�H%���
�;gz&(�M= c�aD�=�i���Y�G�Cӫ�[>`���{������^����DY���� ��ۆIdmy/kQm����ң�9���t�� �� F�Vܐ|�A\`K�G���J���%�.��R Dh)��T"/0�K�h�B�����&�ƈ��J�+a
z9�Y2��z���� ��� dX�[E�
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
E�<�r��V 9 'Nu�xq��=x� ��m��Tlz�=���cpz�>�J�i�VAoU�m4T�[�-�>`��g-;��3e-��4$�녋����6#<� [ 235.199512][T11481] netlink: 4 bytes leftover after parsing attributes in process `syz.6.1727'.
---
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