audit: type=1804 audit(1662962810.089:41575): pid=17256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/926/bus" dev="sda1" ino=14693 res=1
======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/17250 is trying to acquire lock:
00000000d35a5553 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: flush_workqueue+0xe8/0x13e0 kernel/workqueue.c:2658
but task is already holding lock:
00000000c3d9a468 (&sb->s_type->i_mutex_key#25){++++}, at: inode_lock include/linux/fs.h:748 [inline]
00000000c3d9a468 (&sb->s_type->i_mutex_key#25){++++}, at: generic_file_write_iter+0x99/0x730 mm/filemap.c:3320
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&sb->s_type->i_mutex_key#25){++++}:
inode_lock include/linux/fs.h:748 [inline]
__generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989
fat_file_fsync+0x73/0x200 fs/fat/file.c:198
vfs_fsync_range+0x13a/0x220 fs/sync.c:197
generic_write_sync include/linux/fs.h:2750 [inline]
dio_complete+0x763/0xac0 fs/direct-io.c:329
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
-> #1 ((work_completion)(&dio->complete_work)){+.+.}:
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
-> #0 ((wq_completion)"dio/%s"sb->s_id){+.+.}:
flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661
drain_workqueue+0x1a5/0x460 kernel/workqueue.c:2826
destroy_workqueue+0x75/0x790 kernel/workqueue.c:4183
__alloc_workqueue_key+0xb76/0xed0 kernel/workqueue.c:4160
sb_init_dio_done_wq+0x34/0x90 fs/direct-io.c:623
do_blockdev_direct_IO fs/direct-io.c:1285 [inline]
__blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419
blockdev_direct_IO include/linux/fs.h:3059 [inline]
fat_direct_IO+0x1d1/0x370 fs/fat/inode.c:282
generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073
__generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252
generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323
call_write_iter include/linux/fs.h:1821 [inline]
aio_write+0x37f/0x5c0 fs/aio.c:1574
__io_submit_one fs/aio.c:1858 [inline]
io_submit_one+0xecd/0x20c0 fs/aio.c:1909
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
(wq_completion)"dio/%s"sb->s_id --> (work_completion)(&dio->complete_work) --> &sb->s_type->i_mutex_key#25
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#25);
lock((work_completion)(&dio->complete_work));
lock(&sb->s_type->i_mutex_key#25);
lock((wq_completion)"dio/%s"sb->s_id);
*** DEADLOCK ***
1 lock held by syz-executor.2/17250:
#0: 00000000c3d9a468 (&sb->s_type->i_mutex_key#25){++++}, at: inode_lock include/linux/fs.h:748 [inline]
#0: 00000000c3d9a468 (&sb->s_type->i_mutex_key#25){++++}, at: generic_file_write_iter+0x99/0x730 mm/filemap.c:3320
stack backtrace:
CPU: 1 PID: 17250 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2420 [inline]
__lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661
drain_workqueue+0x1a5/0x460 kernel/workqueue.c:2826
destroy_workqueue+0x75/0x790 kernel/workqueue.c:4183
__alloc_workqueue_key+0xb76/0xed0 kernel/workqueue.c:4160
sb_init_dio_done_wq+0x34/0x90 fs/direct-io.c:623
do_blockdev_direct_IO fs/direct-io.c:1285 [inline]
__blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419
blockdev_direct_IO include/linux/fs.h:3059 [inline]
fat_direct_IO+0x1d1/0x370 fs/fat/inode.c:282
generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073
__generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252
generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323
call_write_iter include/linux/fs.h:1821 [inline]
aio_write+0x37f/0x5c0 fs/aio.c:1574
__io_submit_one fs/aio.c:1858 [inline]
io_submit_one+0xecd/0x20c0 fs/aio.c:1909
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fda586ec3c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fda57061168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007fda587fef80 RCX: 00007fda586ec3c9
RDX: 0000000020000540 RSI: 0000000000001801 RDI: 00007fda587da000
RBP: 00007fda5874733f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffec3304af R14: 00007fda57061300 R15: 0000000000022000
audit: type=1800 audit(1662962810.089:41576): pid=17256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14693 res=0
audit: type=1804 audit(1662962811.029:41577): pid=17321 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/927/bus" dev="sda1" ino=14035 res=1
netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'.
audit: type=1800 audit(1662962811.029:41578): pid=17321 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14035 res=0
FAT-fs (loop2): Unrecognized mount option "./bus" or missing value
9pnet: p9_fd_create_tcp (17388): problem connecting socket to 127.0.0.1
9pnet: p9_fd_create_tcp (17436): problem connecting socket to 127.0.0.1
Process accounting resumed
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
audit: type=1804 audit(1662962816.460:41579): pid=17583 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41580): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41581): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41582): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41583): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41584): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41585): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41586): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41587): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1
audit: type=1804 audit(1662962816.650:41588): pid=17594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir884160388/syzkaller.EcJIt4/933/file0" dev="sda1" ino=14738 res=1