netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc3+ #218 Not tainted ------------------------------------------------------ syz-executor3/13631 is trying to acquire lock: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000008ceedc41>] get_online_cpus include/linux/cpu.h:117 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [<000000008ceedc41>] lru_add_drain_all+0xe/0x20 mm/swap.c:729 but task is already holding lock: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000a475d3bf>] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000a475d3bf>] shmem_add_seals+0x197/0x1060 mm/shmem.c:2768 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&sb->s_type->i_mutex_key#10){++++}: 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 -> #5 (&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 -> #4 (sb_writers){.+.+}: spin_lock include/linux/spinlock.h:315 [inline] cache_grow_end.part.37+0x3a/0x180 mm/slab.c:2726 cache_grow_end mm/slab.c:2720 [inline] cache_alloc_refill mm/slab.c:3047 [inline] ____cache_alloc mm/slab.c:3120 [inline] __do_cache_alloc mm/slab.c:3342 [inline] slab_alloc mm/slab.c:3377 [inline] kmem_cache_alloc+0x433/0x760 mm/slab.c:3545 getname_kernel+0x54/0x340 fs/namei.c:218 kern_path_locked+0x83/0x350 fs/namei.c:2404 handle_remove+0xbe/0xb60 drivers/base/devtmpfs.c:306 -> #3 ((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:441 -> #2 (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:2081 pagecache_init+0x48/0x4f mm/filemap.c:977 start_kernel+0x6bc/0x74f init/main.c:695 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 (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 -> #0 (cpu_hotplug_lock.rw_sem){++++}: 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 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 other info that might help us debug this: Chain exists of: cpu_hotplug_lock.rw_sem --> &pipe->mutex/1 --> &sb->s_type->i_mutex_key#10 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock(&pipe->mutex/1); lock(&sb->s_type->i_mutex_key#10); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor3/13631: #0: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000a475d3bf>] inode_lock include/linux/fs.h:713 [inline] #0: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000a475d3bf>] shmem_add_seals+0x197/0x1060 mm/shmem.c:2768 stack backtrace: CPU: 1 PID: 13631 Comm: syz-executor3 Not tainted 4.15.0-rc3+ #218 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 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 RIP: 0033:0x452a39 RSP: 002b:00007f60fcb05c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 00007f60fcb06700 RCX: 0000000000452a39 RDX: 000000000000000c RSI: 0000000000000409 RDI: 0000000000000015 RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a6f7ff R14: 00007f60fcb069c0 R15: 0000000000000002 device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl 9pnet_virtio: no channels available for device ./file1 9pnet_virtio: no channels available for device ./file1 audit: type=1326 audit(1513126805.164:2171): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.190:2172): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=297 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.190:2173): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.191:2174): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.191:2175): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=237 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.192:2176): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.192:2177): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.193:2178): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=257 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126805.194:2179): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13901 comm="syz-executor7" exe="/root/syz-executor7" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 ALSA: seq fatal error: cannot create timer (-19) ALSA: seq fatal error: cannot create timer (-19) binder: 13999:14001 got transaction with invalid offset (72, min 64 max 64) or object. binder: 13999:14001 transaction failed 29201/-22, size 64-32 line 2953 binder: BINDER_SET_CONTEXT_MGR already set binder: 13999:14008 ioctl 40046207 0 returned -16 binder_alloc: 13999: binder_alloc_buf, no vma binder: 13999:14013 transaction failed 29189/-3, size 64-32 line 2890 netlink: 'syz-executor0': attribute type 2 has an invalid length. netlink: 'syz-executor0': attribute type 2 has an invalid length. device gre0 entered promiscuous mode binder: 14163:14164 BC_DEAD_BINDER_DONE fffffffffffffffd not found binder: 14163:14164 BC_ACQUIRE_DONE uffffffffffffffff no match binder: 14163:14164 ERROR: BC_REGISTER_LOOPER called without request binder: 14163:14164 IncRefs 0 refcount change on invalid ref 131 ret -22 binder: 14163:14164 DecRefs 0 refcount change on invalid ref 0 ret -22 binder: 14163:14164 unknown command 0 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 binder: BINDER_SET_CONTEXT_MGR already set binder: 14163:14176 ioctl 40046207 0 returned -16 binder: 14163:14176 ioctl 40046205 200000000003 returned -22 binder: 14163:14176 ioctl 40046205 a returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 14163:14176 ioctl 40046207 0 returned -16 sg_write: data in/out 262364/221 bytes for SCSI command 0xff-- guessing data in; program syz-executor5 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-executor5 not setting count and/or reply_len properly sg_write: data in/out 262364/221 bytes for SCSI command 0xff-- guessing data in; program syz-executor5 not setting count and/or reply_len properly nla_parse: 10 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. binder: 14163:14183 BC_DEAD_BINDER_DONE fffffffffffffffd not found binder: 14163:14183 BC_ACQUIRE_DONE uffffffffffffffff no match binder: 14163:14183 ERROR: BC_REGISTER_LOOPER called without request binder: 14163:14183 IncRefs 0 refcount change on invalid ref 131 ret -22 binder: 14163:14183 DecRefs 0 refcount change on invalid ref 0 ret -22 binder: 14163:14183 unknown command 0 binder: 14163:14183 ioctl c0306201 20000000 returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 14163:14183 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 14163:14176 ioctl 40046207 0 returned -16 binder: 14163:14183 ioctl 40046205 200000000003 returned -22 binder: 14163:14176 ioctl 40046205 a returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 14163:14183 ioctl 40046207 0 returned -16 netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=14208 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14208 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14208 comm=syz-executor4 device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=14208 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14208 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14224 comm=syz-executor4 binder: 14163:14164 ioctl c0306201 20000000 returned -22 netlink: 5 bytes leftover after parsing attributes in process `syz-executor7'. kauditd_printk_skb: 32 callbacks suppressed audit: type=1400 audit(1513126807.240:2212): avc: denied { setuid } for pid=14272 comm="syz-executor4" capability=7 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 netlink: 5 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl QAT: Invalid ioctl Disabled LAPIC found during irq injection audit: type=1326 audit(1513126807.581:2213): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2214): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=53 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2215): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2216): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=85 compat=0 ip=0x452a39 code=0x7ffc0000 dccp_invalid_packet: pskb_may_pull failed audit: type=1326 audit(1513126807.581:2217): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2218): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=16 compat=0 ip=0x452a39 code=0x7ffc0000 dccp_invalid_packet: pskb_may_pull failed audit: type=1326 audit(1513126807.581:2219): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2220): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=55 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513126807.581:2221): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=14371 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 device gre0 entered promiscuous mode device gre0 entered promiscuous mode pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns binder: 14744:14748 ioctl 40286608 5 returned -22 binder: 14744:14748 ioctl 40046205 3 returned -22 binder: 14744:14748 ioctl 40046205 3 returned -22 binder: 14744:14748 ERROR: BC_REGISTER_LOOPER called without request binder: 14748 RLIMIT_NICE not set binder: 14748 RLIMIT_NICE not set binder: 14748 RLIMIT_NICE not set binder: 14744:14756 ioctl 40046205 3 returned -22 binder: 14744:14748 ioctl 40286608 5 returned -22 binder: 14744:14748 ioctl 40046205 3 returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 14744:14756 ioctl 40046207 0 returned -16 binder: 14744:14748 ERROR: BC_REGISTER_LOOPER called without request binder: 14748 RLIMIT_NICE not set binder_alloc: 14744: binder_alloc_buf, no vma binder: 14744:14761 got reply transaction with no transaction stack binder: 14744:14761 transaction failed 29201/-71, size 32-8 line 2690 binder: 14744:14748 transaction failed 29189/-3, size 0-0 line 2890 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29201 binder: unexpected work type, 4, not freed binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 78, process died.