======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G L
------------------------------------------------------
syz.3.1465/11885 is trying to acquire lock:
ffff8880553ac300 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
ffff8880553ac300 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}, at: lookup_slow+0x42/0x70 fs/namei.c:1935
but task is already holding lock:
ffff888121d58c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&of->mutex){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
kernfs_seq_start+0x4f/0x2a0 fs/kernfs/file.c:165
traverse.part.0.constprop.0+0xaf/0x650 fs/seq_file.c:107
traverse fs/seq_file.c:99 [inline]
seq_read_iter+0x93f/0x1270 fs/seq_file.c:196
kernfs_fop_read_iter+0x46c/0x610 fs/kernfs/file.c:290
lo_rw_aio.isra.0+0x70a/0xdf0 drivers/block/loop.c:401
do_req_filebacked drivers/block/loop.c:432 [inline]
loop_handle_cmd drivers/block/loop.c:1949 [inline]
loop_process_work+0x86f/0x11c0 drivers/block/loop.c:1984
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (&p->lock){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
seq_read_iter+0xe1/0x1270 fs/seq_file.c:183
kernfs_fop_read_iter+0x46c/0x610 fs/kernfs/file.c:290
__kernel_read+0x397/0xad0 fs/read_write.c:532
integrity_kernel_read+0x7e/0xb0 security/integrity/iint.c:28
ima_calc_file_hash_tfm+0x25e/0x350 security/integrity/ima/ima_crypto.c:222
ima_calc_file_hash+0x1e3/0x380 security/integrity/ima/ima_crypto.c:280
ima_collect_measurement+0x94f/0xb30 security/integrity/ima/ima_api.c:300
process_measurement+0xdfe/0x2350 security/integrity/ima/ima_main.c:425
ima_file_check+0xc3/0x110 security/integrity/ima/ima_main.c:685
security_file_post_open+0xc4/0x210 security/security.c:2755
do_open fs/namei.c:4839 [inline]
path_openat+0x5cd/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
process_measurement+0x5ab/0x2350 security/integrity/ima/ima_main.c:319
ima_file_check+0xc3/0x110 security/integrity/ima/ima_main.c:685
security_file_post_open+0xc4/0x210 security/security.c:2755
do_open fs/namei.c:4839 [inline]
path_openat+0x5cd/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (sb_writers#6){.+.+}-{0:0}:
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs/super.h:19 [inline]
sb_start_write include/linux/fs/super.h:125 [inline]
mnt_want_write+0x6f/0x420 fs/namespace.c:494
ovl_xattr_set+0x137/0x5a0 fs/overlayfs/xattrs.c:61
__vfs_setxattr+0x175/0x1e0 fs/xattr.c:223
__vfs_setxattr_noperm+0x127/0x660 fs/xattr.c:257
__vfs_setxattr_locked+0x127/0x2b0 fs/xattr.c:318
vfs_setxattr+0x14a/0x390 fs/xattr.c:344
do_setxattr+0x145/0x180 fs/xattr.c:662
filename_setxattr+0x167/0x1d0 fs/xattr.c:690
path_setxattrat+0x1ff/0x3b0 fs/xattr.c:734
__do_sys_setxattr fs/xattr.c:768 [inline]
__se_sys_setxattr fs/xattr.c:764 [inline]
__x64_sys_setxattr+0xc6/0x140 fs/xattr.c:764
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}:
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
inode_lock_shared include/linux/fs.h:1039 [inline]
lookup_slow+0x42/0x70 fs/namei.c:1935
walk_component fs/namei.c:2282 [inline]
lookup_last fs/namei.c:2789 [inline]
path_lookupat+0x5e8/0xc40 fs/namei.c:2813
filename_lookup+0x202/0x590 fs/namei.c:2842
kern_path+0x37/0x50 fs/namei.c:3036
lookup_bdev+0xd8/0x2a0 block/bdev.c:1268
resume_store+0x1d6/0x460 kernel/power/hibernate.c:1278
kobj_attr_store+0x58/0x80 lib/kobject.c:842
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&ovl_i_mutex_dir_key[depth] --> &p->lock --> &of->mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&of->mutex);
lock(&p->lock);
lock(&of->mutex);
rlock(&ovl_i_mutex_dir_key[depth]);
*** DEADLOCK ***
locks held by syz.3.1465/11885: 4, last CPU#1:
#0: ffff8880300d4b70 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff8880343c4460 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffff888121d58c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
#3: ffff8880202a1d28 (kn->active#113){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
#3: ffff8880202a1d28 (kn->active#113){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x332/0x5f0 fs/kernfs/file.c:337
stack backtrace:
CPU: 1 UID: 0 PID: 11885 Comm: syz.3.1465 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
check_prevs_add kernel/locking/lockdep.c:3328 [inline]
validate_chain kernel/locking/lockdep.c:3952 [inline]
__lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
inode_lock_shared include/linux/fs.h:1039 [inline]
lookup_slow+0x42/0x70 fs/namei.c:1935
walk_component fs/namei.c:2282 [inline]
lookup_last fs/namei.c:2789 [inline]
path_lookupat+0x5e8/0xc40 fs/namei.c:2813
filename_lookup+0x202/0x590 fs/namei.c:2842
kern_path+0x37/0x50 fs/namei.c:3036
lookup_bdev+0xd8/0x2a0 block/bdev.c:1268
resume_store+0x1d6/0x460 kernel/power/hibernate.c:1278
kobj_attr_store+0x58/0x80 lib/kobject.c:842
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9fabd9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9fa9ff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9fac025fa0 RCX: 00007f9fabd9e159
RDX: 0000000000000012 RSI: 0000200000000180 RDI: 0000000000000008
RBP: 00007f9fabe3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9fac026038 R14: 00007f9fac025fa0 R15: 00007ffd691db028
PM: hibernation: Configured hibernation resume from disk to 266338399
PM: hibernation: Hibernation image partition 254:95 present
PM: hibernation: Looking for hibernation image.
device: 'md_d1': device_add
kobject: 'md_d1' (ffff8880205c0d60): kobject_add_internal: parent: 'block', set: 'devices'
block md_d1: No ACPI support
PM: Adding info for No Bus:md_d1
kobject: 'md_d1' (ffff8880205c0d60): kobject_uevent_env
kobject: 'md_d1' (ffff8880205c0d60): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'holders' (ffff88803cb6e300): kobject_add_internal: parent: 'md_d1', set: ''
kobject: 'slaves' (ffff88803cb6e980): kobject_add_internal: parent: 'md_d1', set: ''
kobject: 'queue' (ffff888055dd5388): kobject_add_internal: parent: 'md_d1', set: ''
debugfs: creating file 'md_d1'
kobject: 'queue' (ffff888055dd5388): kobject_uevent_env
kobject: 'queue' (ffff888055dd5388): kobject_uevent_env: filter function caused the event to drop!
device: '254:64': device_add
kobject: '254:64' (ffff888055dd0000): kobject_add_internal: parent: 'bdi', set: 'devices'
bdi 254:64: No ACPI support
PM: Adding info for No Bus:254:64
kobject: '254:64' (ffff888055dd0000): kobject_uevent_env
kobject: '254:64' (ffff888055dd0000): fill_kobj_path: path = '/devices/virtual/bdi/254:64'
debugfs: creating file '254:64'
debugfs: creating file 'stats'
debugfs: creating file 'wb_stats'
kobject: 'md_d1' (ffff8880205c0d60): kobject_uevent_env
kobject: 'md_d1' (ffff8880205c0d60): fill_kobj_path: path = '/devices/virtual/block/md_d1'
kobject: 'md' (ffff888036fa40f0): kobject_add_internal: parent: 'md_d1', set: ''
kobject: 'md' (ffff888036fa40f0): kobject_uevent_env
kobject: 'md' (ffff888036fa40f0): kobject_uevent_env: filter function caused the event to drop!
md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+
PM: Image not found (code -6)
PM: hibernation: Hibernation image not present or could not be loaded.
kcov: kcov_task_exit: t = ffff888027f70000, kcov->t = ffff888027f70000
kernfs runtime_suspended_time: removing
kernfs runtime_active_time: removing