BTRFS info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents ====================================================== WARNING: possible circular locking dependency detected 4.14.304-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:5/8933 is trying to acquire lock: (&fs_devs->device_list_mutex){+.+.}, at: [] __reada_start_machine fs/btrfs/reada.c:765 [inline] (&fs_devs->device_list_mutex){+.+.}, at: [] reada_start_machine_worker+0x1d2/0xa90 fs/btrfs/reada.c:746 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: -> #3 ((&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 -> #2 ("%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 -> #1 (&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 -> #0 (&fs_devs->device_list_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 __reada_start_machine fs/btrfs/reada.c:765 [inline] reada_start_machine_worker+0x1d2/0xa90 fs/btrfs/reada.c:746 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: &fs_devs->device_list_mutex --> "%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(&fs_devs->device_list_mutex); *** DEADLOCK *** 2 locks held by kworker/u4:5/8933: #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: 0 PID: 8933 Comm: kworker/u4:5 Not tainted 4.14.304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Workqueue: btrfs-readahead btrfs_readahead_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 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 __reada_start_machine fs/btrfs/reada.c:765 [inline] reada_start_machine_worker+0x1d2/0xa90 fs/btrfs/reada.c:746 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 info (device loop0): using free space tree BTRFS info (device loop0): has skinny extents BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents audit: type=1804 audit(1675403865.048:41): pid=11955 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir1667990053/syzkaller.IWvPMh/71/file0/.log" dev="loop4" ino=263 res=1 audit: type=1804 audit(1675403865.088:42): pid=11932 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir764593847/syzkaller.2goUcs/85/file0/.log" dev="loop4" ino=263 res=1 BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents audit: type=1804 audit(1675403865.668:43): pid=12016 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir1667990053/syzkaller.IWvPMh/72/file0/.log" dev="loop4" ino=263 res=1 audit: type=1804 audit(1675403865.698:44): pid=12016 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir1667990053/syzkaller.IWvPMh/72/file0/.log" dev="loop4" ino=263 res=1 audit: type=1804 audit(1675403865.738:45): pid=12029 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir764593847/syzkaller.2goUcs/86/file0/.log" dev="loop4" ino=263 res=1 PF_BRIDGE: br_mdb_parse() with invalid ifindex Alternate GPT is invalid, using primary GPT. loop2: p1 p2 p3 PF_BRIDGE: br_mdb_parse() with invalid ifindex BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents loop_reread_partitions: partition scan of loop2 () failed (rc=-16) print_req_error: I/O error, dev loop2, sector 58 print_req_error: I/O error, dev loop2, sector 108 print_req_error: I/O error, dev loop2, sector 58 print_req_error: I/O error, dev loop2, sector 108 Buffer I/O error on dev loop2p2, logical block 8, async page read Buffer I/O error on dev loop2p1, logical block 8, async page read print_req_error: I/O error, dev loop2, sector 1008 print_req_error: I/O error, dev loop2, sector 59 Buffer I/O error on dev loop2p2, logical block 9, async page read print_req_error: I/O error, dev loop2, sector 109 Buffer I/O error on dev loop2p1, logical block 9, async page read print_req_error: I/O error, dev loop2, sector 110 Buffer I/O error on dev loop2p1, logical block 10, async page read print_req_error: I/O error, dev loop2, sector 111 Buffer I/O error on dev loop2p1, logical block 11, async page read print_req_error: I/O error, dev loop2, sector 112 Buffer I/O error on dev loop2p1, logical block 12, async page read Buffer I/O error on dev loop2p1, logical block 13, async page read Buffer I/O error on dev loop2p1, logical block 14, async page read Buffer I/O error on dev loop2p1, logical block 15, async page read audit: type=1804 audit(1675403866.328:46): pid=12129 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir764593847/syzkaller.2goUcs/87/file0/.log" dev="loop4" ino=263 res=1 audit: type=1804 audit(1675403866.328:47): pid=12129 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir764593847/syzkaller.2goUcs/87/file0/.log" dev="loop4" ino=263 res=1 PF_BRIDGE: br_mdb_parse() with invalid ifindex PF_BRIDGE: br_mdb_parse() with invalid ifindex Alternate GPT is invalid, using primary GPT. Alternate GPT is invalid, using primary GPT. loop1: p1 p2 p3 loop2: p1 p2 p3 Alternate GPT is invalid, using primary GPT. Alternate GPT is invalid, using primary GPT. loop2: p1 p2 p3 loop1: p1 p2 p3 Alternate GPT is invalid, using primary GPT. loop2: p1 p2 p3 Alternate GPT is invalid, using primary GPT. loop2: p1 p2 p3 Alternate GPT is invalid, using primary GPT. loop1: p1 p2 p3 Alternate GPT is invalid, using primary GPT. loop2: p1 p2 p3 IPVS: ftp: loaded support on port[0] = 21 sctp: [Deprecated]: syz-executor.5 (pid 12392) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor.5 (pid 12468) Use of int in max_burst socket option. Use struct sctp_assoc_value instead XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. sctp: [Deprecated]: syz-executor.4 (pid 12494) Use of int in max_burst socket option. Use struct sctp_assoc_value instead syz-executor.0 (12449) used greatest stack depth: 24008 bytes left XFS (loop0): Unmounting Filesystem sctp: [Deprecated]: syz-executor.5 (pid 12525) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor.4 (pid 12538) Use of int in max_burst socket option. Use struct sctp_assoc_value instead XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount XFS (loop1): Quotacheck needed: Please wait. XFS (loop1): Quotacheck: Done. XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. XFS (loop1): Unmounting Filesystem XFS (loop0): Unmounting Filesystem sctp: [Deprecated]: syz-executor.5 (pid 12573) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor.4 (pid 12589) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor.2 (pid 12592) Use of int in max_burst socket option. Use struct sctp_assoc_value instead XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop1): Mounting V4 Filesystem XFS (loop0): Quotacheck: Done. XFS (loop1): Ending clean mount XFS (loop1): Quotacheck needed: Please wait. XFS (loop1): Quotacheck: Done. XFS (loop0): Unmounting Filesystem XFS (loop1): Unmounting Filesystem sctp: [Deprecated]: syz-executor.2 (pid 12677) Use of int in max_burst socket option. Use struct sctp_assoc_value instead XFS (loop0): Mounting V4 Filesystem XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount XFS (loop1): Quotacheck needed: Please wait. XFS (loop1): Quotacheck: Done. XFS (loop0): Unmounting Filesystem XFS (loop1): Unmounting Filesystem bridge0: port 3(ipvlan2) entered blocking state bridge0: port 3(ipvlan2) entered disabled state sctp: [Deprecated]: syz-executor.2 (pid 12777) Use of int in max_burst socket option. Use struct sctp_assoc_value instead bridge0: port 3(ipvlan2) entered blocking state bridge0: port 3(ipvlan2) entered disabled state bridge0: port 3(ipvlan2) entered blocking state bridge0: port 3(ipvlan2) entered disabled state