kvm: vcpu 0: requested 8 ns lapic timer period limited to 200000 ns ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/10539 is trying to acquire lock: 00000000a7988216 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 but task is already holding lock: 000000008e936dfb (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000008e936dfb (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_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 btrfs_ioctl_qgroup_limit fs/btrfs/ioctl.c:5386 [inline] btrfs_ioctl+0x3c0c/0x76d0 fs/btrfs/ioctl.c:6027 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.2/10539: #0: 00000000566283b6 (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000566283b6 (sb_writers#16){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000008e936dfb (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 000000008e936dfb (sb_internal#3){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 1 PID: 10539 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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_limit_qgroup+0x63/0x7b0 fs/btrfs/qgroup.c:1467 btrfs_ioctl_qgroup_limit fs/btrfs/ioctl.c:5386 [inline] btrfs_ioctl+0x3c0c/0x76d0 fs/btrfs/ioctl.c:6027 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: 0033:0x7f70edec10c9 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:00007f70e5012168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f70edfe1050 RCX: 00007f70edec10c9 RDX: 0000000020001340 RSI: 000000008030942b RDI: 0000000000000004 RBP: 00007f70edf1cae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2b2b249f R14: 00007f70e5012300 R15: 0000000000022000 BTRFS error (device loop2): fail to start transaction for status update: -28 EXT4-fs (loop4): Ignoring removed nomblk_io_submit option EXT4-fs (loop4): Quota format mount options ignored when QUOTA feature is enabled EXT4-fs (loop4): mounted filesystem without journal. Opts: nodiscard,minixdf,quota,noauto_da_alloc,noload,block_validity,nogrpid,nomblk_io_submit,jqfmt=vfsv1,,errors=continue F2FS-fs (loop5): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): invalid crc value kvm: vcpu 0: requested 8 ns lapic timer period limited to 200000 ns F2FS-fs (loop5): Found nat_bits in checkpoint BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): trying to use backup root at mount time BTRFS info (device loop2): use zlib compression, level 3 BTRFS info (device loop2): enabling ssd optimizations BTRFS info (device loop2): using spread ssd allocation scheme BTRFS info (device loop2): using free space tree BTRFS info (device loop2): has skinny extents F2FS-fs (loop5): Mounted with checkpoint version = 753bd00b BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (10570) BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (10591) BTRFS error (device loop2): fail to start transaction for status update: -28 BTRFS info (device loop4): enabling inode map caching BTRFS info (device loop4): trying to use backup root at mount time BTRFS info (device loop4): use zlib compression, level 3 BTRFS info (device loop4): enabling ssd optimizations BTRFS info (device loop4): using spread ssd allocation scheme 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 (10627) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 8 scanned by systemd-udevd (10646) BTRFS error (device loop4): fail to start transaction for status update: -28 F2FS-fs (loop5): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): invalid crc value F2FS-fs (loop5): Found nat_bits in checkpoint F2FS-fs (loop5): Mounted with checkpoint version = 753bd00b BTRFS info (device loop2): enabling inode map caching BTRFS info (device loop2): trying to use backup root at mount time BTRFS info (device loop2): use zlib compression, level 3 BTRFS info (device loop2): enabling ssd optimizations BTRFS info (device loop2): using spread ssd allocation scheme BTRFS info (device loop2): using free space tree BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by syz-executor.4 (10691) BTRFS info (device loop2): has skinny extents BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 8 scanned by systemd-udevd (10703) BTRFS error (device loop2): fail to start transaction for status update: -28 serio: Serial port pts0 EXT4-fs error (device loop2): ext4_ext_check_inode:498: inode #2: comm syz-executor.2: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed kvm: vcpu 0: requested 8 ns lapic timer period limited to 200000 ns audit: type=1804 audit(1675458915.091:3): pid=10783 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3041429833/syzkaller.moByc7/22/file0/bus" dev="loop2" ino=10 res=1 attempt to access beyond end of device loop2: rw=2049, want=45104, limit=40427 serio: Serial port pts0 f2fs_msg: 21 callbacks suppressed F2FS-fs (loop3): Mounted with checkpoint version = 753bd00b F2FS-fs (loop1): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop1): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop1): invalid crc value F2FS-fs (loop1): Found nat_bits in checkpoint F2FS-fs (loop1): Mounted with checkpoint version = 753bd00b F2FS-fs (loop0): Found nat_bits in checkpoint F2FS-fs (loop5): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock serio: Serial port pts0 F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5 audit: type=1804 audit(1675458916.841:4): pid=10825 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir410271333/syzkaller.SI6gmG/18/file0/bus" dev="loop0" ino=10 res=1 attempt to access beyond end of device loop0: rw=2049, want=45104, limit=40427 audit: type=1804 audit(1675458917.021:5): pid=10822 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3041429833/syzkaller.moByc7/23/file0/bus" dev="loop2" ino=10 res=1 attempt to access beyond end of device loop2: rw=2049, want=45104, limit=40427 serio: Serial port pts0 serio: Serial port pts1 audit: type=1804 audit(1675458918.252:6): pid=10883 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir410271333/syzkaller.SI6gmG/19/file0/bus" dev="loop0" ino=10 res=1 serio: Serial port pts0 attempt to access beyond end of device loop0: rw=2049, want=45104, limit=40427 serio: Serial port pts1 serio: Serial port pts0 audit: type=1804 audit(1675458919.642:7): pid=10913 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir3041429833/syzkaller.moByc7/24/file0/bus" dev="loop2" ino=10 res=1