====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/10916 is trying to acquire lock: 000000002f014da3 (&nilfs->ns_sem){++++}, at: nilfs_set_error fs/nilfs2/super.c:86 [inline] 000000002f014da3 (&nilfs->ns_sem){++++}, at: __nilfs_error+0x195/0x401 fs/nilfs2/super.c:131 but task is already holding lock: 00000000d8e06dde (&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 nilfs_put_super+0x152/0x1a0 fs/nilfs2/super.c:473 generic_shutdown_super+0x144/0x370 fs/super.c:456 kill_block_super+0x97/0xf0 fs/super.c:1185 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 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.3/10916: #0: 000000005faab578 (sb_writers#15){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000005faab578 (sb_writers#15){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 000000002831d2e8 (&sb->s_type->i_mutex_key#26){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000002831d2e8 (&sb->s_type->i_mutex_key#26){+.+.}, at: do_truncate+0x125/0x1f0 fs/open.c:61 #2: 00000000f64103c4 (sb_internal#3){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #2: 00000000f64103c4 (sb_internal#3){.+.+}, at: nilfs_transaction_begin+0x1f8/0xa50 fs/nilfs2/segment.c:225 #3: 0000000015d7ec19 (&nilfs->ns_segctor_sem){++++}, at: nilfs_transaction_begin+0x231/0xa50 fs/nilfs2/segment.c:228 #4: 00000000d8e06dde (&dat_lock_key){.+.+}, at: nilfs_get_block+0x18f/0x970 fs/nilfs2/inode.c:79 stack backtrace: CPU: 0 PID: 10916 Comm: syz-executor.3 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: 0033:0x7feb6aba45a9 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:00007feb69517168 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007feb6acc4f80 RCX: 00007feb6aba45a9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000020000a80 RBP: 00007feb6abff580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf03614bf R14: 00007feb69517300 R15: 0000000000022000 Remounting filesystem read-only NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop3): error -5 truncating bmap (ino=16) ntfs: volume version 3.1. ntfs: volume version 3.1. NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_lookup_contig: broken bmap (inode number=16) Remounting filesystem read-only NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop3): error -5 truncating bmap (ino=16) ntfs: volume version 3.1. ntfs: volume version 3.1. NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_lookup_contig: broken bmap (inode number=16) Remounting filesystem read-only NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop3): error -5 truncating bmap (ino=16) NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_lookup_contig: broken bmap (inode number=16) Remounting filesystem read-only NILFS (loop3): bad btree node (ino=16, blocknr=15): level = 0, flags = 0x0, nchildren = 0 NILFS error (device loop3): nilfs_bmap_last_key: broken bmap (inode number=16) NILFS (loop3): error -5 truncating bmap (ino=16) can: request_module (can-proto-6) failed. can: request_module (can-proto-6) failed. base_sock_release(00000000aec76ca4) sk=0000000020b404ed can: request_module (can-proto-6) failed. can: request_module (can-proto-6) failed. IPVS: ftp: loaded support on port[0] = 21 base_sock_release(00000000f57ee6d2) sk=00000000a2871032 MPI: mpi too large (16392 bits) MPI: mpi too large (16392 bits) MPI: mpi too large (16392 bits) MPI: mpi too large (16392 bits) EXT4-fs (loop5): revision level too high, forcing read-only mode EXT4-fs (loop5): orphan cleanup on readonly fs EXT4-fs error (device loop5): ext4_ext_check_inode:498: inode #3: comm syz-executor.5: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 3, max 4(4), depth 0(0) EXT4-fs error (device loop5): ext4_quota_enable:5846: comm syz-executor.5: Bad quota inode # 3 EXT4-fs warning (device loop5): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop5): Cannot turn on quotas: error -117 EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): revision level too high, forcing read-only mode EXT4-fs (loop5): orphan cleanup on readonly fs EXT4-fs error (device loop5): ext4_ext_check_inode:498: inode #3: comm syz-executor.5: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 3, max 4(4), depth 0(0) EXT4-fs error (device loop5): ext4_quota_enable:5846: comm syz-executor.5: Bad quota inode # 3 kauditd_printk_skb: 2 callbacks suppressed audit: type=1804 audit(1666031123.993:8): pid=11435 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2198139486/syzkaller.1oW4JD/70/bus" dev="sda1" ino=14152 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. EXT4-fs warning (device loop5): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop5): Cannot turn on quotas: error -117 audit: type=1804 audit(1666031124.033:9): pid=11435 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2198139486/syzkaller.1oW4JD/70/bus" dev="sda1" ino=14152 res=1 EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): revision level too high, forcing read-only mode EXT4-fs (loop5): orphan cleanup on readonly fs EXT4-fs error (device loop5): ext4_ext_check_inode:498: inode #3: comm syz-executor.5: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 3, max 4(4), depth 0(0) EXT4-fs error (device loop5): ext4_quota_enable:5846: comm syz-executor.5: Bad quota inode # 3 EXT4-fs warning (device loop5): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop5): Cannot turn on quotas: error -117 EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue audit: type=1804 audit(1666031124.763:10): pid=11491 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2198139486/syzkaller.1oW4JD/71/bus" dev="sda1" ino=14138 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. EXT4-fs (loop5): revision level too high, forcing read-only mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1804 audit(1666031124.833:11): pid=11491 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir2198139486/syzkaller.1oW4JD/71/bus" dev="sda1" ino=14138 res=1 EXT4-fs (loop5): orphan cleanup on readonly fs audit: type=1804 audit(1666031124.943:12): pid=11508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir4188959013/syzkaller.1vJH3t/82/bus" dev="sda1" ino=14105 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. audit: type=1804 audit(1666031124.983:13): pid=11508 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir4188959013/syzkaller.1vJH3t/82/bus" dev="sda1" ino=14105 res=1 audit: type=1804 audit(1666031125.093:14): pid=11511 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir2290521825/syzkaller.KOEd8O/85/bus" dev="sda1" ino=14155 res=1 EXT4-fs error (device loop5): ext4_ext_check_inode:498: inode #3: comm syz-executor.5: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 3, max 4(4), depth 0(0)