audit: type=1804 audit(1672206184.336:11): pid=9687 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/4/file0/.log" dev="loop2" ino=263 res=1 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents ====================================================== WARNING: possible circular locking dependency detected 4.14.302-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:0/5 is trying to acquire lock: (sb_internal#2){.+.+}, at: [] sb_start_intwrite include/linux/fs.h:1598 [inline] (sb_internal#2){.+.+}, at: [] start_transaction+0x6de/0xf30 fs/btrfs/transaction.c:548 but task is already holding lock: ((&work->normal_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 ((&work->normal_work)){+.+.}: process_one_work+0x736/0x14a0 kernel/workqueue.c:2093 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #3 ("%s-%s""btrfs", name){+.+.}: flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625 drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790 destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116 __btrfs_destroy_workqueue fs/btrfs/async-thread.c:436 [inline] btrfs_destroy_workqueue+0xf8/0x630 fs/btrfs/async-thread.c:447 scrub_workers_put+0x90/0x1a0 fs/btrfs/scrub.c:4075 btrfs_scrub_dev+0x536/0xcd0 fs/btrfs/scrub.c:4219 btrfs_ioctl_scrub fs/btrfs/ioctl.c:4451 [inline] btrfs_ioctl+0xba8/0x5b20 fs/btrfs/ioctl.c:5681 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #2 (&fs_info->scrub_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 btrfs_scrub_dev+0x1f3/0xcd0 fs/btrfs/scrub.c:4150 btrfs_ioctl_scrub fs/btrfs/ioctl.c:4451 [inline] btrfs_ioctl+0xba8/0x5b20 fs/btrfs/ioctl.c:5681 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #1 (&fs_devs->device_list_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 btrfs_finish_chunk_alloc+0x221/0xe90 fs/btrfs/volumes.c:4923 btrfs_create_pending_block_groups+0x1fd/0x540 fs/btrfs/extent-tree.c:10388 __btrfs_end_transaction+0x1f2/0xaa0 fs/btrfs/transaction.c:851 flush_space+0x8de/0xde0 fs/btrfs/extent-tree.c:5046 btrfs_async_reclaim_metadata_space+0x414/0xc20 fs/btrfs/extent-tree.c:5162 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 -> #0 (sb_internal#2){.+.+}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_intwrite include/linux/fs.h:1598 [inline] start_transaction+0x6de/0xf30 fs/btrfs/transaction.c:548 btrfs_qgroup_rescan_worker+0x176/0x1060 fs/btrfs/qgroup.c:2632 normal_work_helper+0x304/0x1330 fs/btrfs/async-thread.c:376 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 other info that might help us debug this: Chain exists of: sb_internal#2 --> "%s-%s""btrfs", name --> (&work->normal_work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&work->normal_work)); lock("%s-%s""btrfs", name); lock((&work->normal_work)); lock(sb_internal#2); *** DEADLOCK *** 2 locks held by kworker/u4:0/5: #0: ("%s-%s""btrfs", name){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&work->normal_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 stack backtrace: CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: btrfs-qgroup-rescan btrfs_qgroup_rescan_helper Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_intwrite include/linux/fs.h:1598 [inline] start_transaction+0x6de/0xf30 fs/btrfs/transaction.c:548 btrfs_qgroup_rescan_worker+0x176/0x1060 fs/btrfs/qgroup.c:2632 normal_work_helper+0x304/0x1330 fs/btrfs/async-thread.c:376 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 kauditd_printk_skb: 3 callbacks suppressed audit: type=1804 audit(1672206185.917:15): pid=9782 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir7186275/syzkaller.ui2VsU/3/file0/.log" dev="loop2" ino=263 res=1 audit: type=1804 audit(1672206185.917:16): pid=9775 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir709057861/syzkaller.eZgcEB/3/file0/.log" dev="loop2" ino=263 res=1 audit: type=1804 audit(1672206185.927:17): pid=9778 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2753593569/syzkaller.28xMi4/3/file0/.log" dev="loop2" ino=263 res=1 audit: type=1804 audit(1672206185.927:18): pid=9780 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2476623929/syzkaller.nVRzQ3/3/file0/.log" dev="loop2" ino=263 res=1 audit: type=1804 audit(1672206185.957:19): pid=9790 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir905495311/syzkaller.WLmpgv/4/file0/.log" dev="loop2" ino=263 res=1 audit: type=1804 audit(1672206186.307:20): pid=9850 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/6/.log" dev="sda1" ino=13933 res=1 BTRFS error (device loop2): fail to start transaction for status update: -28 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents audit: type=1804 audit(1672206186.547:21): pid=9866 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/7/.log" dev="sda1" ino=13940 res=1 audit: type=1804 audit(1672206186.697:22): pid=9900 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/8/.log" dev="sda1" ino=13941 res=1 audit: type=1804 audit(1672206186.807:23): pid=9919 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/9/.log" dev="sda1" ino=13941 res=1 audit: type=1804 audit(1672206186.927:24): pid=9857 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir709057861/syzkaller.eZgcEB/4/file0/.log" dev="loop2" ino=263 res=1 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents kauditd_printk_skb: 21 callbacks suppressed audit: type=1804 audit(1672206190.978:46): pid=10304 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2753593569/syzkaller.28xMi4/10/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.068:47): pid=10316 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2476623929/syzkaller.nVRzQ3/10/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.118:48): pid=10325 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir709057861/syzkaller.eZgcEB/10/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.118:49): pid=10324 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir7186275/syzkaller.ui2VsU/10/file0/.log" dev="loop1" ino=263 res=1 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents audit: type=1804 audit(1672206191.768:50): pid=10376 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2753593569/syzkaller.28xMi4/11/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.768:51): pid=10397 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir7186275/syzkaller.ui2VsU/11/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.768:52): pid=10397 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir7186275/syzkaller.ui2VsU/11/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.898:53): pid=10395 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1518096429/syzkaller.iMp60r/18/file0/.log" dev="loop1" ino=263 res=1 audit: type=1804 audit(1672206191.898:54): pid=10389 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir905495311/syzkaller.WLmpgv/12/file0/.log" dev="loop1" ino=263 res=1 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents audit: type=1804 audit(1672206192.478:55): pid=10461 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir2753593569/syzkaller.28xMi4/12/file0/.log" dev="loop1" ino=263 res=1 BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents