====================================================== WARNING: possible circular locking dependency detected 4.13.0+ #82 Not tainted ------------------------------------------------------ loop0/12302 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: [] shmem_fallocate+0x161/0x1180 mm/shmem.c:2841 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:2867 [inline] ext4_lazyinit_thread+0x81a/0xd40 fs/ext4/super.c:2961 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:5859 __mark_inode_dirty+0x912/0x1170 fs/fs-writeback.c:2096 generic_update_time+0x1b2/0x270 fs/inode.c:1649 update_time fs/inode.c:1665 [inline] touch_atime+0x26d/0x2f0 fs/inode.c:1737 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] shmem_fallocate+0x161/0x1180 mm/shmem.c:2841 lo_discard drivers/block/loop.c:434 [inline] do_req_filebacked drivers/block/loop.c:570 [inline] loop_handle_cmd drivers/block/loop.c:1705 [inline] loop_queue_work+0x46f/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 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 loop0/12302: #0: (&x->wait#14){..-.}, at: [] complete+0x18/0x80 kernel/sched/completion.c:34 stack backtrace: CPU: 0 PID: 12302 Comm: loop0 Not tainted 4.13.0+ #82 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 netlink: 13 bytes leftover after parsing attributes in process `syz-executor4'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4 sclass=netlink_route_socket pig=13422 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13422 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5 sclass=netlink_route_socket pig=13422 comm=syz-executor7 netlink: 13 bytes leftover after parsing attributes in process `syz-executor4'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13446 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4 sclass=netlink_route_socket pig=13422 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5 sclass=netlink_route_socket pig=13446 comm=syz-executor7 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13422 comm=syz-executor7 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor0 (pid 13544) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor0 (pid 13560) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead device gre0 entered promiscuous mode device syz7 entered promiscuous mode device syz7 left promiscuous mode device syz7 entered promiscuous mode device syz7 left promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13697 comm=syz-executor2 netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. insert transport fail, errno -17 netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'. QAT: Invalid ioctl do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor7 (pid 14183) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor7 (pid 14183) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead FAULT_FLAG_ALLOW_RETRY missing 31 CPU: 0 PID: 14271 Comm: syz-executor6 Not tainted 4.13.0+ #82 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 handle_userfault+0x11ec/0x2390 fs/userfaultfd.c:427 do_anonymous_page mm/memory.c:3135 [inline] handle_pte_fault mm/memory.c:3908 [inline] __handle_mm_fault+0x3823/0x39c0 mm/memory.c:4034 handle_mm_fault+0x334/0x8d0 mm/memory.c:4071 __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66 RSP: 0018:ffff8801c54f7e38 EFLAGS: 00010202 RAX: ffffed0038a9efd5 RBX: 0000000000000008 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff8801c54f7ea0 RDI: 0000000020002000 RBP: ffff8801c54f7e68 R08: 0000001700000016 R09: ffffed0038a9efd5 R10: 0000000000000001 R11: ffffed0038a9efd4 R12: 0000000020002000 R13: ffff8801c54f7ea0 R14: 00007ffffffff000 R15: 0000000020002008 copy_to_user include/linux/uaccess.h:154 [inline] SYSC_pipe2 fs/pipe.c:846 [inline] SyS_pipe2 fs/pipe.c:838 [inline] SYSC_pipe fs/pipe.c:862 [inline] SyS_pipe+0xfd/0x2e0 fs/pipe.c:860 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x451e59 RSP: 002b:00007fdf368fec08 EFLAGS: 00000216 ORIG_RAX: 0000000000000016 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020002000 RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000 R13: 0000000000a6f7ef R14: 00007fdf368ff9c0 R15: 0000000000000000 IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=54252 sclass=netlink_route_socket pig=14553 comm=syz-executor7 nla_parse: 4 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=54252 sclass=netlink_route_socket pig=14561 comm=syz-executor7 netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=3131 sclass=netlink_xfrm_socket pig=14654 comm=syz-executor7 Trying to set illegal importance in message Disabled LAPIC found during irq injection SELinux: unrecognized netlink message: protocol=6 nlmsg_type=3131 sclass=netlink_xfrm_socket pig=14654 comm=syz-executor7 Disabled LAPIC found during irq injection netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor6'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14865 comm=syz-executor6 netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'. SELinux: unrecognized netlink message: protocol=9 nlmsg_type=65535 sclass=netlink_audit_socket pig=15011 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=30 sclass=netlink_audit_socket pig=15011 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=65535 sclass=netlink_audit_socket pig=15011 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=30 sclass=netlink_audit_socket pig=15011 comm=syz-executor3 APIC base relocation is unsupported by KVM QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl TCP: request_sock_TCP: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl irq bypass consumer (token ffff8801ca428180) registration fails: -16 sctp: [Deprecated]: syz-executor7 (pid 15337) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead SELinux: unrecognized netlink message: protocol=0 nlmsg_type=14917 sclass=netlink_route_socket pig=15366 comm=syz-executor5 sctp: [Deprecated]: syz-executor7 (pid 15381) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable RDS: rds_bind could not find a transport for 224.0.0.2, load rds_tcp or rds_rdma?