====================================================== WARNING: possible circular locking dependency detected 4.14.0-rc3-mm1+ #12 Not tainted ------------------------------------------------------ loop0/5434 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:3175 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+0xcb/0x7b0 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:1368 [inline] ext4_init_inode_table+0x4fd/0xdb1 fs/ext4/ialloc.c:1447 ext4_run_li_request fs/ext4/super.c:2868 [inline] ext4_lazyinit_thread+0x808/0xd30 fs/ext4/super.c:2962 kthread+0x3c9/0x4b0 kernel/kthread.c:242 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:4115 SYSC_symlinkat fs/namei.c:4142 [inline] SyS_symlinkat fs/namei.c:4122 [inline] SYSC_symlink fs/namei.c:4155 [inline] SyS_symlink+0x134/0x200 fs/namei.c:4153 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:2061 [inline] ext4_file_mmap+0x161/0x1b0 fs/ext4/file.c:352 call_mmap include/linux/fs.h:1775 [inline] mmap_region+0xa99/0x15a0 mm/mmap.c:1690 do_mmap+0x6a1/0xd50 mm/mmap.c:1468 do_mmap_pgoff include/linux/mm.h:2180 [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:4541 _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:3341 [inline] dir_emit_dots include/linux/fs.h:3352 [inline] dcache_readdir+0x12d/0x5e0 fs/libfs.c:193 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:3175 call_write_iter include/linux/fs.h:1770 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673 do_iter_write+0x15a/0x540 fs/read_write.c:952 vfs_iter_write+0x77/0xb0 fs/read_write.c:965 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 loop0/5434: #0: (&x->wait#14){..-.}, at: [] complete+0x18/0x80 kernel/sched/completion.c:34 stack backtrace: CPU: 0 PID: 5434 Comm: loop0 Not tainted 4.14.0-rc3-mm1+ #12 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+0xe59/0x1d00 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:2746 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:1723 [inline] loop_queue_work+0x26b/0x3900 drivers/block/loop.c:1732 kthread_worker_fn+0x32b/0x980 kernel/kthread.c:646 loop_kthread_worker_fn+0x51/0x60 drivers/block/loop.c:841 kthread+0x3c9/0x4b0 kernel/kthread.c:242 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 device syz3 entered promiscuous mode device syz3 left promiscuous mode device syz3 entered promiscuous mode netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'. ptm ptm3: ldisc open failed (-12), clearing slot 3 TCP: tcp_parse_options: Illegal window scaling value 32 > 14 received TCP: tcp_parse_options: Illegal window scaling value 32 > 14 received SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6064 comm=syz-executor7 9pnet_virtio: no channels available for device ./bus 9pnet_virtio: no channels available for device ./bus SELinux: unrecognized netlink message: protocol=4 nlmsg_type=0 sclass=netlink_tcpdiag_socket pig=6184 comm=syz-executor1 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=0 sclass=netlink_tcpdiag_socket pig=6191 comm=syz-executor1 netlink: 6 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor7'. capability: warning: `syz-executor7' uses deprecated v2 capabilities in a way that may be insecure QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor6'. TCP: tcp_parse_options: Illegal window scaling value 32 > 14 received netlink: 4 bytes leftover after parsing attributes in process `syz-executor6'. TCP: tcp_parse_options: Illegal window scaling value 32 > 14 received kauditd_printk_skb: 166 callbacks suppressed audit: type=1326 audit(1507078804.051:185): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6531 comm="syz-executor5" exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0xffff0000 audit: type=1326 audit(1507078804.174:186): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6531 comm="syz-executor5" exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0xffff0000 audit: type=1326 audit(1507078804.195:187): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6531 comm="syz-executor5" exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0xffff0000 sd 0:0:1:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#0 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#0 CDB[00]: 00 00 00 00 00 00 06 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#0 CDB: Test Unit Ready sd 0:0:1:0: [sg0] tag#0 CDB[00]: 00 00 00 00 00 00 06 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[10]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[20]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 sd 0:0:1:0: [sg0] tag#0 CDB[30]: 00 00 00 00 00 00 00 00 00 00 00 00 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 audit: type=1326 audit(1507078804.825:188): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6779 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0x0 netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44955 sclass=netlink_route_socket pig=6834 comm=syz-executor1 netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44955 sclass=netlink_route_socket pig=6825 comm=syz-executor1 audit: type=1326 audit(1507078805.587:189): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6779 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0x0 device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. rfkill: input handler disabled netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. rfkill: input handler enabled netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'. device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=7172 comm=syz-executor7 device gre0 entered promiscuous mode nla_parse: 6 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode sock: process `syz-executor2' is using obsolete setsockopt SO_BSDCOMPAT audit: type=1326 audit(1507078807.864:190): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7295 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0x0 audit: type=1326 audit(1507078807.954:191): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7295 comm="syz-executor6" exe="/root/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4520a9 code=0x0 netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. TCP: request_sock_TCP: Possible SYN flooding on port 20020. Sending cookies. Check SNMP counters. Bearer <÷ÿ> rejected, not supported in standalone mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode sg_write: data in/out 110652/603 bytes for SCSI command 0x0-- guessing data in; program syz-executor3 not setting count and/or reply_len properly sg_write: data in/out 110652/603 bytes for SCSI command 0x0-- guessing data in; program syz-executor3 not setting count and/or reply_len properly Bearer <÷ÿ> rejected, not supported in standalone mode QAT: Invalid ioctl device gre0 entered promiscuous mode Bearer <÷ÿ> rejected, not supported in standalone mode Bearer <÷ÿ> rejected, not supported in standalone mode syz-executor5: vmalloc: allocation failure: 16587630936 bytes, mode:0x14080c0(GFP_KERNEL|__GFP_ZERO), nodemask=(null) syz-executor5 cpuset=/ mems_allowed=0 CPU: 1 PID: 7712 Comm: syz-executor5 Not tainted 4.14.0-rc3-mm1+ #12 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 warn_alloc+0x1c2/0x2f0 mm/page_alloc.c:3260 __vmalloc_node_range+0x581/0x710 mm/vmalloc.c:1781 __vmalloc_node mm/vmalloc.c:1810 [inline] __vmalloc_node_flags_caller+0x50/0x60 mm/vmalloc.c:1832 kvmalloc_node+0x82/0xd0 mm/util.c:406 kvmalloc include/linux/mm.h:529 [inline] kvmalloc_array include/linux/mm.h:545 [inline] xt_alloc_entry_offsets+0x21/0x30 net/netfilter/x_tables.c:774 translate_table+0x235/0x1610 net/ipv4/netfilter/ip_tables.c:686 do_replace net/ipv4/netfilter/ip_tables.c:1130 [inline] do_ipt_set_ctl+0x34b/0x5c0 net/ipv4/netfilter/ip_tables.c:1664 nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:114 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1255 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2799 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2962 SYSC_setsockopt net/socket.c:1852 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1831 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f7e3b24cc08 EFLAGS: 00000216 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000018 RBP: 0000000000006430 R08: 0000000000000056 R09: 0000000000000000 R10: 0000000020c2c000 R11: 0000000000000216 R12: 00000000004bc305 R13: 00000000ffffffff R14: 0000000020feefe0 R15: 0000000000000000 Mem-Info: active_anon:87501 inactive_anon:31 isolated_anon:0 active_file:3590 inactive_file:5745 isolated_file:0 unevictable:0 dirty:169 writeback:0 unstable:0 slab_reclaimable:7587 slab_unreclaimable:94598 mapped:22117 shmem:40 pagetables:795 bounce:0 free:1408341 free_pcp:501 free_cma:0 Node 0 active_anon:335704kB inactive_anon:124kB active_file:14360kB inactive_file:22980kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:88468kB dirty:676kB writeback:0kB shmem:160kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no Node 0 DMA free:15908kB min:160kB low:200kB high:240kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 2886 6399 6399 Node 0 syz-executor5: vmalloc: allocation failure: 16587630936 bytes, mode:0x14080c0(GFP_KERNEL|__GFP_ZERO), nodemask=(null) syz-executor5 cpuset=/ mems_allowed=0 CPU: 0 PID: 7726 Comm: syz-executor5 Not tainted 4.14.0-rc3-mm1+ #12 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 warn_alloc+0x1c2/0x2f0 mm/page_alloc.c:3260 __vmalloc_node_range+0x581/0x710 mm/vmalloc.c:1781 __vmalloc_node mm/vmalloc.c:1810 [inline] __vmalloc_node_flags_caller+0x50/0x60 mm/vmalloc.c:1832 kvmalloc_node+0x82/0xd0 mm/util.c:406 kvmalloc include/linux/mm.h:529 [inline] kvmalloc_array include/linux/mm.h:545 [inline] xt_alloc_entry_offsets+0x21/0x30 net/netfilter/x_tables.c:774 translate_table+0x235/0x1610 net/ipv4/netfilter/ip_tables.c:686 do_replace net/ipv4/netfilter/ip_tables.c:1130 [inline] do_ipt_set_ctl+0x34b/0x5c0 net/ipv4/netfilter/ip_tables.c:1664 nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:114