====================================================== WARNING: possible circular locking dependency detected 4.14.0+ #192 Not tainted ------------------------------------------------------ syz-executor5/8204 is trying to acquire lock: (&sb->s_type->i_mutex_key#10){++++}, at: [] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#10){++++}, at: [] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 but task is already holding lock: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x56/0x70 fs/pipe.c:75 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&pipe->mutex/1){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 pipe_lock_nested fs/pipe.c:67 [inline] pipe_lock+0x56/0x70 fs/pipe.c:75 iter_file_splice_write+0x264/0xf30 fs/splice.c:699 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #5 (sb_writers){.+.+}: spin_lock include/linux/spinlock.h:315 [inline] lockref_get_not_dead+0x19/0x80 lib/lockref.c:180 -> #4 ((completion)&req.done){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 complete_acquire include/linux/completion.h:40 [inline] __wait_for_common kernel/sched/completion.c:109 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0xcb/0x7b0 kernel/sched/completion.c:144 devtmpfs_create_node+0x32b/0x4a0 drivers/base/devtmpfs.c:115 device_add+0x120f/0x1640 drivers/base/core.c:1824 device_create_groups_vargs+0x1f3/0x250 drivers/base/core.c:2430 device_create_vargs drivers/base/core.c:2470 [inline] device_create+0xda/0x110 drivers/base/core.c:2506 msr_device_create+0x26/0x40 arch/x86/kernel/msr.c:188 cpuhp_invoke_callback+0x2ea/0x1d20 kernel/cpu.c:182 cpuhp_thread_fun+0x48e/0x7e0 kernel/cpu.c:571 smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:437 -> #3 (cpuhp_state-up){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 cpuhp_lock_acquire kernel/cpu.c:85 [inline] cpuhp_invoke_ap_callback kernel/cpu.c:605 [inline] cpuhp_issue_call+0x1e5/0x520 kernel/cpu.c:1495 __cpuhp_setup_state_cpuslocked+0x282/0x600 kernel/cpu.c:1642 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1671 cpuhp_setup_state include/linux/cpuhotplug.h:201 [inline] page_writeback_init+0x4d/0x71 mm/page-writeback.c:2083 pagecache_init+0x48/0x4f mm/filemap.c:977 start_kernel+0x6bc/0x74f init/main.c:690 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #2 (cpuhp_state_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 __cpuhp_setup_state_cpuslocked+0x5b/0x600 kernel/cpu.c:1617 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1671 cpuhp_setup_state_nocalls include/linux/cpuhotplug.h:229 [inline] kvm_guest_init+0x1f3/0x20f arch/x86/kernel/kvm.c:528 setup_arch+0x17e8/0x1a02 arch/x86/kernel/setup.c:1266 start_kernel+0xa5/0x74f init/main.c:530 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #1 (cpu_hotplug_lock.rw_sem){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:293 get_online_cpus include/linux/cpu.h:117 [inline] lru_add_drain_all+0xe/0x20 mm/swap.c:729 shmem_wait_for_pins mm/shmem.c:2672 [inline] shmem_add_seals+0x3df/0x1060 mm/shmem.c:2780 shmem_fcntl+0xfe/0x130 mm/shmem.c:2815 do_fcntl+0x73e/0x1160 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xdc/0x120 fs/fcntl.c:448 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #0 (&sb->s_type->i_mutex_key#10){++++}: check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 call_write_iter include/linux/fs.h:1772 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:653 do_iter_write+0x15a/0x540 fs/read_write.c:932 vfs_iter_write+0x77/0xb0 fs/read_write.c:945 iter_file_splice_write+0x7db/0xf30 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#10 --> sb_writers --> &pipe->mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pipe->mutex/1); lock(sb_writers); lock(&pipe->mutex/1); lock(&sb->s_type->i_mutex_key#10); *** DEADLOCK *** 2 locks held by syz-executor5/8204: #0: (sb_writers#5){.+.+}, at: [] file_start_write include/linux/fs.h:2715 [inline] #0: (sb_writers#5){.+.+}, at: [] do_splice fs/splice.c:1146 [inline] #0: (sb_writers#5){.+.+}, at: [] SYSC_splice fs/splice.c:1402 [inline] #0: (sb_writers#5){.+.+}, at: [] SyS_splice+0x1117/0x1630 fs/splice.c:1382 #1: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] #1: (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x56/0x70 fs/pipe.c:75 stack backtrace: CPU: 0 PID: 8204 Comm: syz-executor5 Not tainted 4.14.0+ #192 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug+0x42d/0x610 kernel/locking/lockdep.c:1271 check_prev_add+0x666/0x15f0 kernel/locking/lockdep.c:1914 check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 call_write_iter include/linux/fs.h:1772 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:653 do_iter_write+0x15a/0x540 fs/read_write.c:932 vfs_iter_write+0x77/0xb0 fs/read_write.c:945 iter_file_splice_write+0x7db/0xf30 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007f8106fa7be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 0000000000000016 RSI: 0000000000000000 RDI: 0000000000000017 RBP: 0000000000000086 R08: 00000000fffffdff R09: 0000000000000000 R10: 0000000000800000 R11: 0000000000000212 R12: 00000000006f5278 R13: 00000000ffffffff R14: 00007f8106fa86d4 R15: 0000000000000000 device gre0 entered promiscuous mode nla_parse: 2 callbacks suppressed netlink: 17 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor4'. kauditd_printk_skb: 269 callbacks suppressed audit: type=1326 audit(1511566324.175:1050): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8410 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0xffff0000 netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1326 audit(1511566324.290:1051): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8410 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0xffff0000 QAT: Invalid ioctl QAT: Invalid ioctl device gre0 entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl device gre0 entered promiscuous mode device gre0 entered promiscuous mode audit: type=1326 audit(1511566324.906:1052): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566324.907:1053): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566324.908:1054): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566324.908:1055): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=2 compat=0 ip=0x40cbb1 code=0x7ffc0000 audit: type=1326 audit(1511566324.908:1056): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566324.908:1057): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566324.909:1058): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=228 compat=0 ip=0x45561a code=0x7ffc0000 audit: type=1326 audit(1511566324.909:1059): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=8580 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=24324 sclass=netlink_route_socket pig=8784 comm=syz-executor1 irq bypass consumer (token ffff8801c8cc6a80) registration fails: -16 device gre0 entered promiscuous mode sg_write: data in/out 822404280/197 bytes for SCSI command 0x12-- guessing data in; program syz-executor2 not setting count and/or reply_len properly sg_write: data in/out 458972/231 bytes for SCSI command 0x7-- guessing data in; program syz-executor2 not setting count and/or reply_len properly sg_write: data in/out 822404280/197 bytes for SCSI command 0x12-- guessing data in; program syz-executor2 not setting count and/or reply_len properly sg_write: data in/out 458972/231 bytes for SCSI command 0x7-- guessing data in; program syz-executor2 not setting count and/or reply_len properly netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor7'. rfkill: input handler disabled rfkill: input handler enabled QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl APIC base relocation is unsupported by KVM QAT: Invalid ioctl SELinux: unknown mount option SELinux: unknown mount option sg_write: data in/out 822404280/197 bytes for SCSI command 0x12-- guessing data in; program syz-executor5 not setting count and/or reply_len properly sg_write: data in/out 262364/161 bytes for SCSI command 0xff-- guessing data in; program syz-executor5 not setting count and/or reply_len properly QAT: Invalid ioctl QAT: Invalid ioctl sg_write: data in/out 822404280/197 bytes for SCSI command 0x12-- guessing data in; program syz-executor5 not setting count and/or reply_len properly sg_write: data in/out 262364/161 bytes for SCSI command 0xff-- guessing data in; program syz-executor5 not setting count and/or reply_len properly NFS: bad mount option value specified: v; NFS: bad mount option value specified: v; device gre0 entered promiscuous mode 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 device gre0 entered promiscuous mode device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=256 sclass=netlink_route_socket pig=9524 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=256 sclass=netlink_route_socket pig=9524 comm=syz-executor2 device gre0 entered promiscuous mode sctp: [Deprecated]: syz-executor3 (pid 9653) Use of int in maxseg socket option. Use struct sctp_assoc_value instead insert transport fail, errno -17 device gre0 entered promiscuous mode sctp: [Deprecated]: syz-executor3 (pid 9653) Use of int in maxseg socket option. Use struct sctp_assoc_value instead nla_parse: 11 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. kauditd_printk_skb: 327 callbacks suppressed audit: type=1326 audit(1511566329.472:1387): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.505:1388): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=9 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.505:1389): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.507:1390): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.516:1391): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=9 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.519:1392): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.520:1393): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.522:1394): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=298 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.522:1395): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 audit: type=1326 audit(1511566329.522:1396): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=9823 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452879 code=0x7ffc0000 netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. encrypted_key: master key parameter '0>ÏìÌtjû;£º©‡Óò¹eIà|‡˜Ãù} Ÿ{¥÷o' is invalid RDS: rds_bind could not find a transport for 172.20.6.170, load rds_tcp or rds_rdma? sctp: [Deprecated]: syz-executor3 (pid 10079) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead RDS: rds_bind could not find a transport for 172.20.6.170, load rds_tcp or rds_rdma? sctp: [Deprecated]: syz-executor3 (pid 10096) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead device gre0 entered promiscuous mode netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. do_dccp_getsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=10183 comm=syz-executor7 do_dccp_getsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. sg_write: data in/out 156/14 bytes for SCSI command 0x85-- guessing data in; program syz-executor4 not setting count and/or reply_len properly netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. sg_write: data in/out 156/14 bytes for SCSI command 0x85-- guessing data in; program syz-executor4 not setting count and/or reply_len properly netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. QAT: Invalid ioctl QAT: Invalid ioctl sg_write: data in/out 45116/228 bytes for SCSI command 0x0-- guessing data in; program syz-executor1 not setting count and/or reply_len properly QAT: Invalid ioctl QAT: Invalid ioctl sg_write: data in/out 45116/228 bytes for SCSI command 0x0-- guessing data in; program syz-executor1 not setting count and/or reply_len properly