kauditd_printk_skb: 4 callbacks suppressed audit: type=1800 audit(1671558839.876:452): pid=3316 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name=".pending_reads" dev="loop2" ino=263 res=0 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/3316 is trying to acquire lock: 000000003b2cc83b (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_add_qgroup_relation+0xa7/0x740 fs/btrfs/qgroup.c:1264 but task is already holding lock: 0000000006dfaef3 (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 0000000006dfaef3 (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal#2){.+.+}: sb_start_intwrite include/linux/fs.h:1626 [inline] start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 btrfs_quota_enable+0x169/0x10b0 fs/btrfs/qgroup.c:905 btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:5233 [inline] btrfs_ioctl+0x622c/0x76d0 fs/btrfs/ioctl.c:6021 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&fs_info->qgroup_ioctl_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_add_qgroup_relation+0xa7/0x740 fs/btrfs/qgroup.c:1264 btrfs_ioctl_qgroup_assign fs/btrfs/ioctl.c:5280 [inline] btrfs_ioctl+0x3a05/0x76d0 fs/btrfs/ioctl.c:6023 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.2/3316: #0: 00000000077ba4ea (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000077ba4ea (sb_writers#20){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 0000000006dfaef3 (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 0000000006dfaef3 (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 3316 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_add_qgroup_relation+0xa7/0x740 fs/btrfs/qgroup.c:1264 btrfs_ioctl_qgroup_assign fs/btrfs/ioctl.c:5280 [inline] btrfs_ioctl+0x3a05/0x76d0 fs/btrfs/ioctl.c:6023 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7bb9da50d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f7bb8317168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7bb9ec4f80 RCX: 00007f7bb9da50d9 RDX: 0000000020000280 RSI: 0000000040189429 RDI: 0000000000000004 RBP: 00007f7bb9e00ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdfc7f250f R14: 00007f7bb8317300 R15: 0000000000022000 FAT-fs (loop4): Directory bread(block 64) failed FAT-fs (loop4): Directory bread(block 65) failed print_req_error: 395 callbacks suppressed print_req_error: I/O error, dev loop1, sector 608 print_req_error: I/O error, dev loop1, sector 208 FAT-fs (loop4): Directory bread(block 66) failed print_req_error: I/O error, dev loop1, sector 608 FAT-fs (loop4): Directory bread(block 67) failed print_req_error: I/O error, dev loop1, sector 609 print_req_error: I/O error, dev loop1, sector 610 print_req_error: I/O error, dev loop1, sector 611 print_req_error: I/O error, dev loop1, sector 612 FAT-fs (loop4): Directory bread(block 68) failed print_req_error: I/O error, dev loop1, sector 613 print_req_error: I/O error, dev loop1, sector 614 print_req_error: I/O error, dev loop1, sector 615 FAT-fs (loop4): Directory bread(block 69) failed FAT-fs (loop4): Directory bread(block 70) failed FAT-fs (loop4): Directory bread(block 71) failed FAT-fs (loop4): Directory bread(block 72) failed FAT-fs (loop4): Directory bread(block 73) failed FAT-fs (loop5): Directory bread(block 64) failed FAT-fs (loop5): Directory bread(block 65) failed FAT-fs (loop5): Directory bread(block 66) failed FAT-fs (loop5): Directory bread(block 67) failed FAT-fs (loop5): Directory bread(block 68) failed FAT-fs (loop5): Directory bread(block 69) failed FAT-fs (loop5): Directory bread(block 70) failed FAT-fs (loop5): Directory bread(block 71) failed FAT-fs (loop5): Directory bread(block 72) failed FAT-fs (loop5): Directory bread(block 73) failed FAT-fs (loop4): Directory bread(block 64) failed FAT-fs (loop4): Directory bread(block 65) failed FAT-fs (loop4): Directory bread(block 66) failed FAT-fs (loop4): Directory bread(block 67) failed FAT-fs (loop4): Directory bread(block 68) failed FAT-fs (loop4): Directory bread(block 69) failed FAT-fs (loop4): Directory bread(block 70) failed FAT-fs (loop4): Directory bread(block 71) failed BTRFS info (device loop3): using free space tree FAT-fs (loop4): Directory bread(block 72) failed BTRFS info (device loop3): has skinny extents FAT-fs (loop4): Directory bread(block 73) failed FAT-fs (loop5): Directory bread(block 64) failed FAT-fs (loop5): Directory bread(block 65) failed FAT-fs (loop5): Directory bread(block 66) failed FAT-fs (loop5): Directory bread(block 67) failed FAT-fs (loop5): Directory bread(block 68) failed FAT-fs (loop5): Directory bread(block 69) failed FAT-fs (loop5): Directory bread(block 70) failed BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (3459) FAT-fs (loop5): Directory bread(block 71) failed FAT-fs (loop5): Directory bread(block 72) failed FAT-fs (loop5): Directory bread(block 73) failed BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (3499) audit: type=1800 audit(1671558841.396:453): pid=3459 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name=".pending_reads" dev="sda1" ino=15358 res=0 FAT-fs (loop4): Directory bread(block 64) failed audit: type=1800 audit(1671558841.606:454): pid=3463 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name=".pending_reads" dev="loop3" ino=263 res=0 FAT-fs (loop4): Directory bread(block 65) failed FAT-fs (loop4): Directory bread(block 66) failed FAT-fs (loop5): Directory bread(block 64) failed FAT-fs (loop5): Directory bread(block 65) failed FAT-fs (loop5): Directory bread(block 66) failed FAT-fs (loop4): Directory bread(block 67) failed FAT-fs (loop5): Directory bread(block 67) failed FAT-fs (loop4): Directory bread(block 68) failed FAT-fs (loop5): Directory bread(block 68) failed FAT-fs (loop4): Directory bread(block 69) failed FAT-fs (loop4): Directory bread(block 70) failed FAT-fs (loop5): Directory bread(block 69) failed FAT-fs (loop4): Directory bread(block 71) failed BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents FAT-fs (loop5): Directory bread(block 70) failed FAT-fs (loop5): Directory bread(block 71) failed FAT-fs (loop4): Directory bread(block 72) failed FAT-fs (loop5): Directory bread(block 72) failed FAT-fs (loop5): Directory bread(block 73) failed FAT-fs (loop4): Directory bread(block 73) failed BTRFS warning (device ): duplicate device /dev/loop1 devid 1 generation 8 scanned by syz-executor.1 (3506) audit: type=1800 audit(1671558842.016:455): pid=3517 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name=".pending_reads" dev="loop2" ino=263 res=0 audit: type=1800 audit(1671558842.086:456): pid=3506 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name=".pending_reads" dev="sda1" ino=15411 res=0 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents buffer_io_error: 286 callbacks suppressed Buffer I/O error on dev loop1p2, logical block 8, async page read Buffer I/O error on dev loop1p2, logical block 9, async page read Buffer I/O error on dev loop1p2, logical block 10, async page read Buffer I/O error on dev loop1p2, logical block 11, async page read Buffer I/O error on dev loop1p2, logical block 12, async page read Buffer I/O error on dev loop1p2, logical block 13, async page read Buffer I/O error on dev loop1p2, logical block 14, async page read Buffer I/O error on dev loop1p2, logical block 15, async page read Buffer I/O error on dev loop1p3, logical block 8, async page read Buffer I/O error on dev loop4p2, logical block 8, async page read BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (3621) audit: type=1800 audit(1671558842.576:457): pid=3511 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name=".pending_reads" dev="sda1" ino=15355 res=0 audit: type=1800 audit(1671558842.716:458): pid=3560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name=".pending_reads" dev="loop3" ino=263 res=0 audit: type=1800 audit(1671558842.756:459): pid=3621 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name=".pending_reads" dev="sda1" ino=15410 res=0 BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents audit: type=1800 audit(1671558843.026:460): pid=3596 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name=".pending_reads" dev="loop1" ino=263 res=0 audit: type=1800 audit(1671558843.196:461): pid=3651 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name=".pending_reads" dev="sda1" ino=15313 res=0 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents BTRFS info (device loop1): using free space tree BTRFS info (device loop1): has skinny extents mmap: syz-executor.4 (3833) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. print_req_error: 447 callbacks suppressed print_req_error: I/O error, dev loop4, sector 608 print_req_error: I/O error, dev loop4, sector 208 print_req_error: I/O error, dev loop4, sector 408 print_req_error: I/O error, dev loop4, sector 608 print_req_error: I/O error, dev loop4, sector 609 print_req_error: I/O error, dev loop4, sector 208 print_req_error: I/O error, dev loop4, sector 209 print_req_error: I/O error, dev loop4, sector 210 print_req_error: I/O error, dev loop4, sector 211 print_req_error: I/O error, dev loop4, sector 212 buffer_io_error: 390 callbacks suppressed Buffer I/O error on dev loop4p2, logical block 8, async page read Buffer I/O error on dev loop4p2, logical block 9, async page read Buffer I/O error on dev loop4p2, logical block 10, async page read Buffer I/O error on dev loop4p2, logical block 11, async page read Buffer I/O error on dev loop4p2, logical block 12, async page read Buffer I/O error on dev loop4p2, logical block 13, async page read Buffer I/O error on dev loop4p2, logical block 14, async page read Buffer I/O error on dev loop4p2, logical block 15, async page read Buffer I/O error on dev loop4p7, logical block 8, async page read Buffer I/O error on dev loop4p7, logical block 9, async page read