====================================================== WARNING: possible circular locking dependency detected 4.13.0+ #79 Not tainted ------------------------------------------------------ loop0/6389 is trying to acquire lock: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock include/linux/fs.h:712 [inline] (&sb->s_type->i_mutex_key#9){++++}, at: [] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3131 but now in release context of a crosslock acquired at the following: ((complete)&ret.event){+.+.}, at: [] submit_bio_wait+0x15e/0x200 block/bio.c:953 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 ((complete)&ret.event){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 complete_acquire include/linux/completion.h:39 [inline] __wait_for_common kernel/sched/completion.c:108 [inline] wait_for_common_io kernel/sched/completion.c:128 [inline] wait_for_completion_io+0xc8/0x770 kernel/sched/completion.c:176 submit_bio_wait+0x15e/0x200 block/bio.c:953 blkdev_issue_zeroout+0x13c/0x1d0 block/blk-lib.c:370 sb_issue_zeroout include/linux/blkdev.h:1367 [inline] ext4_init_inode_table+0x4fd/0xdb1 fs/ext4/ialloc.c:1447 ext4_run_li_request fs/ext4/super.c:2866 [inline] ext4_lazyinit_thread+0x81a/0xd40 fs/ext4/super.c:2960 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #3 (&meta_group_info[i]->alloc_sem){++++}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 down_read+0x96/0x150 kernel/locking/rwsem.c:23 __ext4_new_inode+0x26dc/0x4f00 fs/ext4/ialloc.c:1056 ext4_symlink+0x2d9/0xae0 fs/ext4/namei.c:3118 vfs_symlink+0x323/0x560 fs/namei.c:4116 SYSC_symlinkat fs/namei.c:4143 [inline] SyS_symlinkat fs/namei.c:4123 [inline] SYSC_symlink fs/namei.c:4156 [inline] SyS_symlink+0x134/0x200 fs/namei.c:4154 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #2 (jbd2_handle){++++}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 start_this_handle+0x4b8/0x1080 fs/jbd2/transaction.c:390 jbd2__journal_start+0x389/0x9f0 fs/jbd2/transaction.c:444 __ext4_journal_start_sb+0x15f/0x550 fs/ext4/ext4_jbd2.c:80 __ext4_journal_start fs/ext4/ext4_jbd2.h:314 [inline] ext4_dirty_inode+0x56/0xa0 fs/ext4/inode.c:5864 __mark_inode_dirty+0x912/0x1170 fs/fs-writeback.c:2096 generic_update_time+0x1b2/0x270 fs/inode.c:1636 update_time fs/inode.c:1652 [inline] touch_atime+0x26d/0x2f0 fs/inode.c:1724 file_accessed include/linux/fs.h:2036 [inline] ext4_file_mmap+0x161/0x1b0 fs/ext4/file.c:350 call_mmap include/linux/fs.h:1748 [inline] mmap_region+0xa99/0x15a0 mm/mmap.c:1690 do_mmap+0x6a1/0xd50 mm/mmap.c:1468 do_mmap_pgoff include/linux/mm.h:2150 [inline] vm_mmap_pgoff+0x1de/0x280 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1518 [inline] SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1476 SYSC_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:90 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #1 (&mm->mmap_sem){++++}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 __might_fault+0x13a/0x1d0 mm/memory.c:4502 _copy_to_user+0x2c/0xc0 lib/usercopy.c:24 copy_to_user include/linux/uaccess.h:154 [inline] filldir+0x1a7/0x320 fs/readdir.c:196 dir_emit_dot include/linux/fs.h:3314 [inline] dir_emit_dots include/linux/fs.h:3325 [inline] dcache_readdir+0x12d/0x5e0 fs/libfs.c:192 iterate_dir+0x4b2/0x5d0 fs/readdir.c:51 SYSC_getdents fs/readdir.c:231 [inline] SyS_getdents+0x225/0x450 fs/readdir.c:212 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #0 (&sb->s_type->i_mutex_key#9){++++}: down_write+0x87/0x120 kernel/locking/rwsem.c:53 inode_lock include/linux/fs.h:712 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3131 call_write_iter include/linux/fs.h:1743 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:650 do_iter_write+0x15a/0x540 fs/read_write.c:929 vfs_iter_write+0x77/0xb0 fs/read_write.c:942 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#9 --> &meta_group_info[i]->alloc_sem --> (complete)&ret.event Possible unsafe locking scenario by crosslock: CPU0 CPU1 ---- ---- lock(&meta_group_info[i]->alloc_sem); lock((complete)&ret.event); lock(&sb->s_type->i_mutex_key#9); unlock((complete)&ret.event); *** DEADLOCK *** 1 lock held by loop0/6389: #0: (&x->wait#14){..-.}, at: [] complete+0x18/0x80 kernel/sched/completion.c:34 stack backtrace: CPU: 0 PID: 6389 Comm: loop0 Not tainted 4.13.0+ #79 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_circular_bug+0x503/0x710 kernel/locking/lockdep.c:1259 check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894 commit_xhlock kernel/locking/lockdep.c:5015 [inline] commit_xhlocks kernel/locking/lockdep.c:5059 [inline] lock_commit_crosslock+0xe73/0x1d10 kernel/locking/lockdep.c:5098 complete_release_commit include/linux/completion.h:49 [inline] complete+0x24/0x80 kernel/sched/completion.c:39 submit_bio_wait_endio+0x9c/0xd0 block/bio.c:930 bio_endio+0x2f8/0x8d0 block/bio.c:1843 req_bio_endio block/blk-core.c:204 [inline] blk_update_request+0x2a6/0xe20 block/blk-core.c:2738 blk_mq_end_request+0x54/0x120 block/blk-mq.c:509 lo_complete_rq+0xbe/0x1f0 drivers/block/loop.c:463 __blk_mq_complete_request+0x38f/0x6c0 block/blk-mq.c:550 blk_mq_complete_request+0x4f/0x60 block/blk-mq.c:570 loop_handle_cmd drivers/block/loop.c:1710 [inline] loop_queue_work+0x26b/0x3900 drivers/block/loop.c:1719 kthread_worker_fn+0x340/0x9b0 kernel/kthread.c:635 loop_kthread_worker_fn+0x51/0x60 drivers/block/loop.c:836 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 sctp: [Deprecated]: syz-executor6 (pid 8642) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor6 (pid 8664) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode nla_parse: 8 callbacks suppressed netlink: 10 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 10 bytes leftover after parsing attributes in process `syz-executor3'. device gre0 entered promiscuous mode netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. skbuff: bad partial csum: csum=98/65532 len=264 skbuff: bad partial csum: csum=98/65532 len=264 netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. sctp: [Deprecated]: syz-executor2 (pid 8993) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 8993) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. 8021q: VLANs not supported on lo 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x000000000000fffa RIP = 0x0000000000000000 RFLAGS=0x00023000 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 DS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000 GDTR: limit=0x0000ffff, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000 IDTR: limit=0x0000ffff, base=0x0000000000000000 TR: sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000008 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8c6f RSP = 0xffff8801d94f74c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007fc760efd700 GSBase=ffff8801db200000 TRBase=ffff8801db223100 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001c59b5000 CR4=00000000001426f0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d42b30 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=00000042 EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00007fff ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffd4c271c089 EPT pointer = 0x00000001cd3f701e SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7681 sclass=netlink_route_socket pig=9262 comm=syz-executor3 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7681 sclass=netlink_route_socket pig=9262 comm=syz-executor3 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. sock: sock_set_timeout: `syz-executor4' (pid 9281) tries to set negative timeout RDS: rds_bind could not find a transport for 0.0.5.27, load rds_tcp or rds_rdma? device gre0 entered promiscuous mode RDS: rds_bind could not find a transport for 0.0.5.27, load rds_tcp or rds_rdma? SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7 sclass=netlink_route_socket pig=9479 comm=syz-executor1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7 sclass=netlink_route_socket pig=9486 comm=syz-executor1 sctp: [Deprecated]: syz-executor4 (pid 9591) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor4 (pid 9761) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor4 (pid 9767) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead SELinux: unrecognized netlink message: protocol=0 nlmsg_type=585 sclass=netlink_route_socket pig=9820 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=585 sclass=netlink_route_socket pig=9843 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=26 sclass=netlink_tcpdiag_socket pig=9986 comm=syz-executor2 nla_parse: 18 callbacks suppressed netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=26 sclass=netlink_tcpdiag_socket pig=10009 comm=syz-executor2 netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. sctp: [Deprecated]: syz-executor3 (pid 10031) Use of int in maxseg socket option. Use struct sctp_assoc_value instead cgroup: cgroup2: unknown option ">" sctp: [Deprecated]: syz-executor3 (pid 10040) Use of int in maxseg socket option. Use struct sctp_assoc_value instead ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) QAT: Invalid ioctl sg_write: data in/out 2127708969/6 bytes for SCSI command 0xe3-- guessing data in; program syz-executor7 not setting count and/or reply_len properly sg_write: data in/out 2127708969/6 bytes for SCSI command 0xe3-- guessing data in; program syz-executor7 not setting count and/or reply_len properly QAT: Invalid ioctl ALSA: seq fatal error: cannot create timer (-19) netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns QAT: Invalid ioctl QAT: Invalid ioctl netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. kvm: apic: phys broadcast and lowest prio kvm: apic: phys broadcast and lowest prio device gre0 entered promiscuous mode rfkill: input handler disabled rfkill: input handler enabled sctp: [Deprecated]: syz-executor3 (pid 10641) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 11 bytes leftover after parsing attributes in process `syz-executor1'. sctp: [Deprecated]: syz-executor3 (pid 10641) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead SELinux: unrecognized netlink message: protocol=9 nlmsg_type=65535 sclass=netlink_audit_socket pig=10698 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=30 sclass=netlink_audit_socket pig=10698 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=65535 sclass=netlink_audit_socket pig=10698 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=30 sclass=netlink_audit_socket pig=10707 comm=syz-executor6 kvm [10800]: vcpu2, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8 kvm [10800]: vcpu2, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x8 TCP: request_sock_TCPv6: Possible SYN flooding on port 20029. Sending cookies. Check SNMP counters. device lo entered promiscuous mode xs_tcp_setup_socket: connect returned unhandled error -113 xprt_adjust_timeout: rq_timeout = 0! SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44295 sclass=netlink_route_socket pig=10993 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44295 sclass=netlink_route_socket pig=11007 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7681 sclass=netlink_route_socket pig=11047 comm=syz-executor1