====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc2+ #328 Not tainted ------------------------------------------------------ syz-executor0/1383 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [<0000000033bc0635>] __might_fault+0xe0/0x1d0 mm/memory.c:4570 but task is already holding lock: (ashmem_mutex){+.+.}, at: [<00000000a1fcfb3e>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] (ashmem_mutex){+.+.}, at: [<00000000a1fcfb3e>] ashmem_ioctl+0x3db/0x11b0 drivers/staging/android/ashmem.c:782 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (ashmem_mutex){+.+.}: __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 ashmem_mmap+0x53/0x410 drivers/staging/android/ashmem.c:362 call_mmap include/linux/fs.h:1786 [inline] mmap_region+0xa99/0x15a0 mm/mmap.c:1705 do_mmap+0x6c0/0xe00 mm/mmap.c:1483 do_mmap_pgoff include/linux/mm.h:2223 [inline] vm_mmap_pgoff+0x1de/0x280 mm/util.c:355 SYSC_mmap_pgoff mm/mmap.c:1533 [inline] SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1491 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __might_fault+0x13a/0x1d0 mm/memory.c:4571 _copy_from_user+0x2c/0x110 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] ashmem_pin_unpin drivers/staging/android/ashmem.c:710 [inline] ashmem_ioctl+0x438/0x11b0 drivers/staging/android/ashmem.c:782 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ashmem_mutex); lock(&mm->mmap_sem); lock(ashmem_mutex); lock(&mm->mmap_sem); *** DEADLOCK *** 1 lock held by syz-executor0/1383: #0: (ashmem_mutex){+.+.}, at: [<00000000a1fcfb3e>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] #0: (ashmem_mutex){+.+.}, at: [<00000000a1fcfb3e>] ashmem_ioctl+0x3db/0x11b0 drivers/staging/android/ashmem.c:782 stack backtrace: CPU: 0 PID: 1383 Comm: syz-executor0 Not tainted 4.16.0-rc2+ #328 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+0x194/0x24d lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __might_fault+0x13a/0x1d0 mm/memory.c:4571 _copy_from_user+0x2c/0x110 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] ashmem_pin_unpin drivers/staging/android/ashmem.c:710 [inline] ashmem_ioctl+0x438/0x11b0 drivers/staging/android/ashmem.c:782 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f9f4b03bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9f4b03c6d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: 0000000000007709 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000017a R14: 00000000006f2410 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl binder: 1783:1789 ioctl c018620b 20000000 returned -14 binder: 1783:1789 ioctl c018620b 20000000 returned -14 cannot load conntrack support for proto=3 cannot load conntrack support for proto=3 QAT: Invalid ioctl xt_connbytes: Forcing CT accounting to be enabled x_tables: ip_tables: ah match: only valid for protocol 51 QAT: Invalid ioctl x_tables: ip_tables: ah match: only valid for protocol 51 kauditd_printk_skb: 868 callbacks suppressed audit: type=1400 audit(1519568962.059:20483): avc: denied { net_admin } for pid=29413 comm="syz-executor1" capability=12 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 audit: type=1400 audit(1519568962.105:20484): avc: denied { create } for pid=2091 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1519568962.106:20485): avc: denied { sys_admin } for pid=2094 comm="syz-executor4" capability=21 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 audit: type=1400 audit(1519568962.109:20486): avc: denied { dac_read_search } for pid=2094 comm="syz-executor4" capability=2 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 audit: type=1400 audit(1519568962.109:20487): avc: denied { dac_override } for pid=2094 comm="syz-executor4" capability=1 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 audit: type=1400 audit(1519568962.111:20488): avc: denied { sys_admin } for pid=2094 comm="syz-executor4" capability=21 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 audit: type=1400 audit(1519568962.112:20489): avc: denied { create } for pid=2093 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 audit: type=1400 audit(1519568962.113:20490): avc: denied { dac_read_search } for pid=2094 comm="syz-executor4" capability=2 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 xt_CT: No such timeout policy "syz1" audit: type=1400 audit(1519568962.123:20491): avc: denied { net_admin } for pid=15919 comm="syz-executor2" capability=12 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 audit: type=1400 audit(1519568962.130:20492): avc: denied { dac_read_search } for pid=4298 comm="syz-executor4" capability=2 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 xt_CT: No such timeout policy "syz1" FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 2286 Comm: syz-executor7 Not tainted 4.16.0-rc2+ #328 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] __do_kmalloc mm/slab.c:3703 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3720 memdup_user+0x2c/0x90 mm/util.c:160 strndup_user+0x62/0xb0 mm/util.c:217 SYSC_request_key security/keys/keyctl.c:176 [inline] SyS_request_key+0xa7/0x2d0 security/keys/keyctl.c:158 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f827eab9c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000f9 RAX: ffffffffffffffda RBX: 00007f827eaba6d4 RCX: 0000000000453de9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000013 R13: 0000000000000478 R14: 00000000006f6be0 R15: 0000000000000000 xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 2356 Comm: syz-executor3 Not tainted 4.16.0-rc2+ #328 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 kmem_cache_zalloc include/linux/slab.h:691 [inline] avc_alloc_node+0x27/0x4d0 security/selinux/avc.c:549 avc_insert security/selinux/avc.c:668 [inline] avc_compute_av+0x22a/0x710 security/selinux/avc.c:974 avc_has_perm_noaudit security/selinux/avc.c:1110 [inline] avc_has_perm+0x4be/0x680 security/selinux/avc.c:1144 sock_has_perm+0x299/0x420 security/selinux/hooks.c:4352 selinux_socket_sendmsg+0x36/0x40 security/selinux/hooks.c:4607 security_socket_sendmsg+0x7d/0xb0 security/security.c:1370 sock_sendmsg+0x43/0x110 net/socket.c:637 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f62b4cbbc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f62b4cbc6d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: 0000000020447fc8 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 00000000000004b3 R14: 00000000006f7168 R15: 0000000000000000 x_tables: ip6_tables: rpfilter match: used from hooks PREROUTING/OUTPUT, but only valid from PREROUTING x_tables: ip6_tables: rpfilter match: used from hooks PREROUTING/OUTPUT, but only valid from PREROUTING SELinux: unknown mount option SELinux: unknown mount option SELinux: unrecognized netlink message: protocol=0 nlmsg_type=40806 sclass=netlink_route_socket pig=2425 comm=syz-executor4 PPPIOCDETACH file->f_count=2 PPPIOCDETACH file->f_count=2 binder: 2813:2821 ERROR: BC_REGISTER_LOOPER called without request binder: 2813:2821 ERROR: BC_REGISTER_LOOPER called without request binder: 2845:2851 transaction failed 29189/-22, size 0-0 line 2848 binder: 2845:2863 transaction failed 29189/-22, size 0-0 line 2848 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 loop_reread_partitions: partition scan of loop0 () failed (rc=-13) binder_alloc: 3026: binder_alloc_buf, no vma binder: 3026:3028 transaction failed 29189/-3, size 0-0 line 2963 binder_alloc: 3026: binder_alloc_buf, no vma binder: 3026:3030 transaction failed 29189/-3, size 0-0 line 2963 binder: BINDER_SET_CONTEXT_MGR already set binder: 3026:3030 ioctl 40046207 0 returned -16 binder_alloc: 3026: binder_alloc_buf, no vma binder: 3026:3028 transaction failed 29189/-3, size 0-0 line 2963 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 kauditd_printk_skb: 972 callbacks suppressed audit: type=1400 audit(1519568967.064:21465): avc: denied { net_admin } for pid=14208 comm="syz-executor5" capability=12 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 audit: type=1400 audit(1519568967.064:21466): avc: denied { sys_admin } for pid=3096 comm="syz-executor1" capability=21 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 audit: type=1400 audit(1519568967.068:21467): avc: denied { sys_admin } for pid=3096 comm="syz-executor1" capability=21 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 audit: type=1400 audit(1519568967.071:21468): avc: denied { dac_override } for pid=3096 comm="syz-executor1" capability=1 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 audit: type=1400 audit(1519568967.073:21469): avc: denied { net_raw } for pid=3112 comm="syz-executor6" capability=13 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 audit: type=1400 audit(1519568967.081:21470): avc: denied { net_admin } for pid=3112 comm="syz-executor6" capability=12 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 audit: type=1400 audit(1519568967.087:21471): avc: denied { net_admin } for pid=4296 comm="syz-executor6" capability=12 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 audit: type=1400 audit(1519568967.097:21472): avc: denied { net_admin } for pid=4288 comm="syz-executor3" capability=12 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 audit: type=1400 audit(1519568967.098:21473): avc: denied { net_admin } for pid=4288 comm="syz-executor3" capability=12 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 audit: type=1400 audit(1519568967.101:21474): avc: denied { sys_admin } for pid=29413 comm="syz-executor1" capability=21 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 x_tables: ip_tables: SYNPROXY target: used from hooks PREROUTING/OUTPUT, but only usable from INPUT/FORWARD binder: 3280 RLIMIT_NICE not set binder_alloc: 3272: binder_alloc_buf, no vma binder: 3272:3292 transaction failed 29189/-3, size 0-0 line 2963 binder: BINDER_SET_CONTEXT_MGR already set binder: 3272:3296 ioctl 40046207 0 returned -16 binder: 3292 RLIMIT_NICE not set binder_alloc: 3272: binder_alloc_buf, no vma binder: 3272:3307 transaction failed 29189/-3, size 0-0 line 2963 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 xt_cluster: node mask cannot exceed total number of nodes xt_cluster: node mask cannot exceed total number of nodes xt_policy: input policy not valid in POSTROUTING and OUTPUT xt_policy: input policy not valid in POSTROUTING and OUTPUT xprt_adjust_timeout: rq_timeout = 0!