audit: type=1804 audit(1672820571.350:443): pid=20762 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir4233298080/syzkaller.0ljp4L/287/file0" dev="sda1" ino=14004 res=1 BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by syz-executor.5 (20758) ====================================================== WARNING: possible circular locking dependency detected BTRFS warning (device ): duplicate device /dev/loop5 devid 1 generation 8 scanned by systemd-udevd (20798) 4.19.211-syzkaller #0 Not tainted BTRFS error (device loop4): fail to start transaction for status update: -28 ------------------------------------------------------ syz-executor.4/20719 is trying to acquire lock: 000000008558975d (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 but task is already holding lock: 00000000faa7ff9c (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 00000000faa7ff9c (sb_internal#3){.+.+}, 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#3){.+.+}: 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_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/0x76d0 fs/btrfs/ioctl.c:6025 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#3); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#3); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.4/20719: #0: 0000000057d105e5 (sb_writers#26){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000057d105e5 (sb_writers#26){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 00000000faa7ff9c (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 00000000faa7ff9c (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 20719 Comm: syz-executor.4 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_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/0x76d0 fs/btrfs/ioctl.c:6025 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: 0033:0x7fd537ef90c9 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:00007fd53646b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd538018f80 RCX: 00007fd537ef90c9 RDX: 00000000200011c0 RSI: 000000004010942a RDI: 0000000000000006 RBP: 00007fd537f54ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe7ebd659f R14: 00007fd53646b300 R15: 0000000000022000 audit: type=1800 audit(1672820572.410:444): pid=20803 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=14037 res=0 audit: type=1804 audit(1672820572.440:445): pid=20803 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir931187114/syzkaller.oBMrBI/289/file0" dev="sda1" ino=14037 res=1 audit: type=1800 audit(1672820572.550:446): pid=20826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=13973 res=0 audit: type=1804 audit(1672820572.550:447): pid=20826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir4233298080/syzkaller.0ljp4L/288/file0" dev="sda1" ino=13973 res=1 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (20827) BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS error (device loop4): fail to start transaction for status update: -28 BTRFS info (device loop5): using free space tree BTRFS info (device loop5): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (20953) snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by syz-executor.2 (21012) snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present BTRFS error (device loop4): fail to start transaction for status update: -28 snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present BTRFS info (device loop4): using free space tree BTRFS info (device loop4): has skinny extents snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present BTRFS error (device loop4): fail to start transaction for status update: -28 snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present snd_aloop snd_aloop.0: control 0:0:0:syz1:0 is already present XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. XFS (loop2): Unmounting Filesystem overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) [U] 'CSt|M0C2O%_ABg2OezmXt3 [U] 홎O_t overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) [U] t+'AG8-)έ/a9Mq{5 [U] 0LmZiS [U] B@V,jp% ~7<MtFR4n*WTmYx̜GQxŕq/׶)JS;K [U] g7TPGm->/Xp [U] 25 [U] ,nr(DR4,  HG :fvqc9^)o cYD$dw e!˃# [U] urlr Bp9^yr9S`m*~H{ [U] C)LNr4*D>BF ,PҍzŽi{g(6P32 Ft5nhg8L,tP(noKJXMJCӡZѥbI)ʢ 8FZ|L OˁmJR!_C~%PGzݴ0т6l~|Ҏ_%I`Gk mĥw [U] ]k#wsO`YW+9ؔ}|t8_{cॷԏBɮaLRz ʷaèDoHv-O%O,yG鱞¨Ra8FTDS+s+Ԝ]3Ӵ%Tei{J)6SHu!%PPgb} [~ [U] oP/Ϲş*? Q`H kU$ꣅ5ntA*7]/3OMd?Ra`Nk1mG{{e4_0~U *VXuG [U] <32N 'q(#>:|m7/zđ(W =(E)Ѓ6$]Ƈm10"1F?y}Ysntg 76&-jxyp#& [U] d9{ky:K#O םns@oئG*\bq"w؈ؽk [U] H)![b+u)gJ0m?ݎ޽OyYĽ=^GdΡ?ހD.;UZSr@So9vma` [U] C [U] ?> [U] o% XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop2): Mounting V4 Filesystem [U] 'CSt|M0C2O%_ABg2OezmXt3 XFS (loop1): DAX enabled. Warning: EXPERIMENTAL, use at your own risk [U] 홎O_t XFS (loop1): Mounting V4 Filesystem [U] t+'AG8-)έ/a9Mq{5 [U] 0LmZiS [U] B@V,jp% ~7<MtFR4n*WTmYx̜GQxŕq/׶)JS;K XFS (loop1): Ending clean mount [U] g7TPGm->/Xp [U] 25 [U] ,nr(DR4,  HG :fvqc9^)o cYD$dw e!˃# XFS (loop2): Ending clean mount [U] urlr Bp9^yr9S`m*~H{ XFS (loop2): Quotacheck: Done. [U] C)LNr4*D>BF ,PҍzŽi{g(6P32 Ft5nhg8L,tP(noKJXMJCӡZѥbI)ʢ 8FZ|L OˁmJR!_C~%PGzݴ0т6l~|Ҏ_%I`Gk mĥw [U] ]k#wsO`YW+9ؔ}|t8_{cॷԏBɮaLRz ʷaèDoHv-O%O,yG鱞¨Ra8FTDS+s+Ԝ]3Ӵ%Tei{J)6SHu!%PPgb} [~ [U] oP/Ϲş*? Q`H kU$ꣅ5ntA*7]/3OMd?Ra`Nk1mG{{e4_0~U *VXuG XFS (loop2): Unmounting Filesystem [U] <32N 'q(#>:|m7/zđ(W =(E)Ѓ6$]Ƈm10"1F?y}Ysntg 76&-jxyp#& [U] d9{ky:K#O םns@oئG*\bq"w؈ؽk [U] H)![b+u)gJ0m?ݎ޽OyYĽ=^GdΡ?ހD.;UZSr@So9vma` [U] C Bluetooth: hci0: command 0x0401 tx timeout [U] ?> overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) [U] o% overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) [U] 'CSt|M0C2O%_ABg2OezmXt3 [U] 홎O_t [U] t+'AG8-)έ/a9Mq{5 [U] 0LmZiS [U] B@V,jp% ~7<MtFR4n*WTmYx̜GQxŕq/׶)JS;K overlayfs: failed to decode file handle (len=24, type=251, flags=0, err=-22) [U] g7TPGm->/Xp [U] 25 [U] ,nr(DR4,  HG :fvqc9^)o cYD$dw e!˃# [U] urlr Bp9^yr9S`m*~H{ [U] C)LNr4*D>BF ,PҍzŽi{g(6P32 Ft5nhg8L,tP(noKJXMJCӡZѥbI)ʢ 8FZ|L OˁmJR!_C~%PGzݴ0т6l~|Ҏ_%I`Gk mĥw [U] ]k#wsO`YW+9ؔ}|t8_{cॷԏBɮaLRz ʷaèDoHv-O%O,yG鱞¨Ra8FTDS+s+Ԝ]3Ӵ%Tei{J)6SHu!%PPgb} [~ [U] oP/Ϲş*? Q`H kU$ꣅ5ntA*7]/3OMd?Ra`Nk1mG{{e4_0~U *VXuG [U] <32N 'q(#>:|m7/zđ(W =(E)Ѓ6$]Ƈm10"1F?y}Ysntg 76&-jxyp#& [U] d9{ky:K#O םns@oئG*\bq"w؈ؽk [U] H)![b+u)gJ0m?ݎ޽OyYĽ=^GdΡ?ހD.;UZSr@So9vma` [U] C [U] ?> XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop1): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop1): DAX unsupported by block device. Turning off DAX. [U] o% XFS (loop1): Mounting V4 Filesystem XFS (loop2): Mounting V4 Filesystem XFS (loop1): Ending clean mount XFS (loop1): Quotacheck needed: Please wait. XFS (loop1): Quotacheck: Done. XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. XFS (loop1): Unmounting Filesystem XFS (loop2): Unmounting Filesystem [U] 'CSt|M0C2O%_ABg2OezmXt3 [U] 홎O_t netlink: 4079 bytes leftover after parsing attributes in process `syz-executor.3'. [U] t+'AG8-)έ/a9Mq{5 [U] 0LmZiS [U] B@V,jp% ~7<MtFR4n*WTmYx̜GQxŕq/׶)JS;K [U] g7TPGm->/Xp [U] 25 [U] ,nr(DR4,  HG :fvqc9^)o cYD$dw e!˃# [U] urlr Bp9^yr9S`m*~H{ [U] C)LNr4*D>BF ,PҍzŽi{g(6P32 Ft5nhg8L,tP(noKJXMJCӡZѥbI)ʢ 8FZ|L OˁmJR!_C~%PGzݴ0т6l~|Ҏ_%I`Gk mĥw [U] ]k#wsO`YW+9ؔ}|t8_{cॷԏBɮaLRz ʷaèDoHv-O%O,yG鱞¨Ra8FTDS+s+Ԝ]3Ӵ%Tei{J)6SHu!%PPgb} [~ [U] oP/Ϲş*? Q`H kU$ꣅ5ntA*7]/3OMd?Ra`Nk1mG{{e4_0~U *VXuG [U] <32N 'q(#>:|m7/zđ(W =(E)Ѓ6$]Ƈm10"1F?y}Ysntg 76&-jxyp#& [U] d9{ky:K#O םns@oئG*\bq"w؈ؽk [U] H)![b+u)gJ0m?ݎ޽OyYĽ=^GdΡ?ހD.;UZSr@So9vma` [U] C [U] ?> [U] o% XFS (loop1): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop1): DAX unsupported by block device. Turning off DAX. XFS (loop1): Mounting V4 Filesystem XFS (loop1): Ending clean mount XFS (loop1): Quotacheck needed: Please wait. XFS (loop1): Quotacheck: Done. XFS (loop1): Unmounting Filesystem XFS (loop2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk XFS (loop2): DAX unsupported by block device. Turning off DAX. XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Quotacheck needed: Please wait. XFS (loop2): Quotacheck: Done. XFS (loop2): Unmounting Filesystem Bluetooth: hci0: command 0x0401 tx timeout block nbd4: shutting down sockets netlink: 4079 bytes leftover after parsing attributes in process `syz-executor.3'.