BTRFS info (device loop4): using spread ssd allocation scheme BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents print_req_error: I/O error, dev loop6, sector 512 ====================================================== WARNING: possible circular locking dependency detected 4.14.305-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:3/794 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/u4:3/794: #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: 794 Comm: kworker/u4:3 Not tainted 4.14.305-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS info (device loop5): enabling inode map caching BTRFS info (device loop5): trying to use backup root at mount time BTRFS info (device loop5): use zlib compression BTRFS info (device loop5): enabling ssd optimizations BTRFS info (device loop5): using spread ssd allocation scheme BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS error (device loop5): fail to start transaction for status update: -28 mmap: syz-executor.0 (11827) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. BTRFS info (device loop5): enabling inode map caching loop3: p1 < > p3 < > p4 loop3: p4 start 16777216 is beyond EOD, truncated BTRFS info (device loop5): trying to use backup root at mount time BTRFS info (device loop5): use zlib compression BTRFS info (device loop5): enabling ssd optimizations BTRFS info (device loop5): using spread ssd allocation scheme BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents loop3: p1 < > p3 < > p4 loop3: p4 start 16777216 is beyond EOD, truncated BTRFS error (device loop5): fail to start transaction for status update: -28 input: syz0 as /devices/virtual/input/input6 BTRFS info (device loop5): enabling inode map caching BTRFS info (device loop5): trying to use backup root at mount time BTRFS info (device loop5): use zlib compression BTRFS info (device loop5): enabling ssd optimizations BTRFS info (device loop5): using spread ssd allocation scheme BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS error (device loop5): fail to start transaction for status update: -28 EXT4-fs warning (device loop1): ext4_fill_super:3598: metadata_csum and uninit_bg are redundant flags; please run fsck. EXT4-fs (loop1): VFS: Found ext4 filesystem with invalid superblock checksum. Run e2fsck? NILFS (loop1): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds REISERFS warning (device loop3): super-6502 reiserfs_getopt: unknown mount option "system." NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds audit: type=1800 audit(1675773425.229:37): pid=12128 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=18 res=0 audit: type=1804 audit(1675773425.229:38): pid=12128 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/73/file0/bus" dev="loop5" ino=18 res=1 REISERFS warning (device loop3): super-6502 reiserfs_getopt: unknown mount option "system." audit: type=1804 audit(1675773425.229:39): pid=12128 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/73/file0/bus" dev="loop5" ino=18 res=1 REISERFS warning (device loop3): super-6502 reiserfs_getopt: unknown mount option "system." audit: type=1804 audit(1675773425.229:40): pid=12128 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/73/file0/bus" dev="loop5" ino=18 res=1 NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds audit: type=1800 audit(1675773425.699:41): pid=12184 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=18 res=0 audit: type=1804 audit(1675773425.699:42): pid=12184 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/74/file0/bus" dev="loop5" ino=18 res=1 audit: type=1804 audit(1675773425.719:43): pid=12184 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/74/file0/bus" dev="loop5" ino=18 res=1 audit: type=1804 audit(1675773425.719:44): pid=12184 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir3233639086/syzkaller.jhrUQX/74/file0/bus" dev="loop5" ino=18 res=1 BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents REISERFS warning (device loop3): super-6502 reiserfs_getopt: unknown mount option "system." NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds audit: type=1800 audit(1675773426.269:45): pid=12232 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=18 res=0 audit: type=1800 audit(1675773426.289:46): pid=12234 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="bus" dev="sda1" ino=14221 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. print_req_error: I/O error, dev loop5, sector 0 NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents XFS (loop1): Unmounting Filesystem netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.