NILFS (loop5): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop5): nilfs_bmap_lookup_contig: broken bmap (inode number=16) ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/15160 is trying to acquire lock: 0000000067c82748 (&nilfs->ns_sem){++++}, at: nilfs_set_error fs/nilfs2/super.c:86 [inline] 0000000067c82748 (&nilfs->ns_sem){++++}, at: __nilfs_error+0x195/0x401 fs/nilfs2/super.c:131 but task is already holding lock: 00000000dc8f0bd9 (&dat_lock_key){.+.+}, at: nilfs_get_block+0x18f/0x970 fs/nilfs2/inode.c:79 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&dat_lock_key){.+.+}: nilfs_count_free_blocks+0x68/0x180 fs/nilfs2/the_nilfs.c:698 nilfs_set_log_cursor fs/nilfs2/super.c:237 [inline] nilfs_cleanup_super+0x133/0x490 fs/nilfs2/super.c:319 load_nilfs+0x79f/0x11f0 fs/nilfs2/the_nilfs.c:317 nilfs_fill_super fs/nilfs2/super.c:1063 [inline] nilfs_mount+0x9b5/0xe70 fs/nilfs2/super.c:1321 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&nilfs->ns_sem){++++}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 nilfs_set_error fs/nilfs2/super.c:86 [inline] __nilfs_error+0x195/0x401 fs/nilfs2/super.c:131 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_contig+0x13d/0x180 fs/nilfs2/bmap.c:95 nilfs_get_block+0x1ce/0x970 fs/nilfs2/inode.c:80 block_truncate_page+0x366/0xb00 fs/buffer.c:2887 nilfs_truncate+0x25d/0x4e0 fs/nilfs2/inode.c:739 nilfs_setattr+0x246/0x2a0 fs/nilfs2/inode.c:835 notify_change+0x70b/0xfc0 fs/attr.c:334 do_truncate+0x134/0x1f0 fs/open.c:63 vfs_truncate+0x54b/0x6d0 fs/open.c:109 do_sys_truncate fs/open.c:132 [inline] do_sys_truncate+0x145/0x170 fs/open.c:120 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(&dat_lock_key); lock(&nilfs->ns_sem); lock(&dat_lock_key); lock(&nilfs->ns_sem); *** DEADLOCK *** 5 locks held by syz-executor.5/15160: #0: 00000000a48916ca (sb_writers#30){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000a48916ca (sb_writers#30){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 0000000035e2fa76 (&sb->s_type->i_mutex_key#39){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000035e2fa76 (&sb->s_type->i_mutex_key#39){+.+.}, at: do_truncate+0x125/0x1f0 fs/open.c:61 #2: 000000007f6ab413 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #2: 000000007f6ab413 (sb_internal#3){.+.+}, at: nilfs_transaction_begin+0x1f8/0xa50 fs/nilfs2/segment.c:225 #3: 000000009de0bd6c (&nilfs->ns_segctor_sem){++++}, at: nilfs_transaction_begin+0x231/0xa50 fs/nilfs2/segment.c:228 #4: 00000000dc8f0bd9 (&dat_lock_key){.+.+}, at: nilfs_get_block+0x18f/0x970 fs/nilfs2/inode.c:79 stack backtrace: CPU: 0 PID: 15160 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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 down_write+0x34/0x90 kernel/locking/rwsem.c:70 nilfs_set_error fs/nilfs2/super.c:86 [inline] __nilfs_error+0x195/0x401 fs/nilfs2/super.c:131 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_lookup_contig+0x13d/0x180 fs/nilfs2/bmap.c:95 nilfs_get_block+0x1ce/0x970 fs/nilfs2/inode.c:80 block_truncate_page+0x366/0xb00 fs/buffer.c:2887 nilfs_truncate+0x25d/0x4e0 fs/nilfs2/inode.c:739 nilfs_setattr+0x246/0x2a0 fs/nilfs2/inode.c:835 notify_change+0x70b/0xfc0 fs/attr.c:334 do_truncate+0x134/0x1f0 fs/open.c:63 vfs_truncate+0x54b/0x6d0 fs/open.c:109 do_sys_truncate fs/open.c:132 [inline] do_sys_truncate+0x145/0x170 fs/open.c:120 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6360f155a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f635f888168 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f6361035f80 RCX: 00007f6360f155a9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000020000a80 RBP: 00007f6360f70580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe1f0ee59f R14: 00007f635f888300 R15: 0000000000022000 Remounting filesystem read-only NILFS (loop5): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop5): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop5): error -5 truncating bmap (ino=16) SQUASHFS error: squashfs_read_data failed to read block 0x0 NILFS (loop5): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds NILFS error (device loop5): nilfs_bmap_lookup_contig: broken bmap (inode number=16) squashfs: SQUASHFS error: unable to read squashfs_super_block Remounting filesystem read-only NILFS (loop5): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 IPVS: ftp: loaded support on port[0] = 21 NILFS error (device loop5): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop5): error -5 truncating bmap (ino=16) SQUASHFS error: squashfs_read_data failed to read block 0x0 NILFS (loop5): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. IPVS: ftp: loaded support on port[0] = 21 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.2'. SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.2'. SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. audit: type=1800 audit(1666284986.449:761): pid=15570 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14212 res=0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block netlink: 16 bytes leftover after parsing attributes in process `syz-executor.2'. SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block audit: type=1800 audit(1666284987.369:762): pid=15663 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14163 res=0 squashfs: SQUASHFS error: unable to read squashfs_super_block nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. audit: type=1800 audit(1666284987.519:763): pid=15668 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=14244 res=0 SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block squashfs: SQUASHFS error: unable to read squashfs_super_block audit: type=1800 audit(1666284988.409:764): pid=15714 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13956 res=0 audit: type=1800 audit(1666284989.009:765): pid=15744 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14081 res=0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block audit: type=1800 audit(1666284989.329:766): pid=15772 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=13897 res=0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read squashfs_super_block