====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc2+ #328 Not tainted ------------------------------------------------------ syz-executor3/19420 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [<00000000944f2785>] __might_fault+0xe0/0x1d0 mm/memory.c:4570 but task is already holding lock: (ashmem_mutex){+.+.}, at: [<000000003ff9cd21>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] (ashmem_mutex){+.+.}, at: [<000000003ff9cd21>] 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-executor3/19420: #0: (ashmem_mutex){+.+.}, at: [<000000003ff9cd21>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] #0: (ashmem_mutex){+.+.}, at: [<000000003ff9cd21>] ashmem_ioctl+0x3db/0x11b0 drivers/staging/android/ashmem.c:782 stack backtrace: CPU: 0 PID: 19420 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 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:00007fd163037c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd1630386d4 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 xt_NFQUEUE: number of total queues is 0 xt_NFQUEUE: number of total queues is 0 ipt_rpfilter: only valid in 'raw' or 'mangle' table, not 'raw°' device eql entered promiscuous mode ipt_rpfilter: only valid in 'raw' or 'mangle' table, not 'raw°' ipt_CLUSTERIP: bad num_local_nodes 855 QAT: Invalid ioctl device syz4 entered promiscuous mode QAT: Invalid ioctl device syz4 left promiscuous mode QAT: Invalid ioctl device syz4 entered promiscuous mode device syz4 left promiscuous mode QAT: Invalid ioctl encrypted_key: master key parameter '' is invalid encrypted_key: master key parameter '' is invalid xt_NFQUEUE: number of total queues is 0 xt_NFQUEUE: number of total queues is 0 kauditd_printk_skb: 1095 callbacks suppressed audit: type=1400 audit(1519567548.569:9193): avc: denied { net_admin } for pid=4234 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(1519567548.570:9194): avc: denied { net_admin } for pid=4234 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(1519567548.575:9195): avc: denied { net_admin } for pid=4234 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(1519567548.585:9196): avc: denied { map_create } for pid=20158 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1519567548.586:9197): avc: denied { map_read map_write } for pid=20158 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1519567548.588:9198): avc: denied { prog_load } for pid=20158 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1519567548.589:9199): avc: denied { map_create } for pid=20158 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 encrypted_key: master key parameter '' is invalid audit: type=1400 audit(1519567548.591:9200): avc: denied { dac_override } for pid=20160 comm="syz-executor6" 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(1519567548.594:9201): avc: denied { prog_load } for pid=20158 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1519567548.595:9202): avc: denied { dac_override } for pid=20160 comm="syz-executor6" 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 encrypted_key: master key parameter '' is invalid binder: 20168:20188 IncRefs 0 refcount change on invalid ref 0 ret -22 dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. binder: 20255:20256 ioctl c0306201 20007000 returned -14 binder_alloc: binder_alloc_mmap_handler: 20255 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 20255:20259 ioctl c0306201 20007000 returned -14 binder: 20255:20257 ioctl 40046207 0 returned -16 binder: send failed reply for transaction 65 to 20255:20256 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 QAT: Invalid ioctl l2tp_core: tunl 4: fd 20 wrong protocol, got 1, expected 17 SELinux: failed to load policy SELinux: failed to load policy kernel msg: ebtables bug: please report to author: Valid hook without chain kernel msg: ebtables bug: please report to author: Valid hook without chain xt_ecn: cannot match TCP bits for non-tcp packets xt_ecn: cannot match TCP bits for non-tcp packets ptrace attach of "/root/syz-executor0"[12064] was attempted by "/root/syz-executor0"[20791] binder: 20792 RLIMIT_NICE not set ieee80211 phy4: Selected rate control algorithm 'minstrel_ht' binder: BINDER_SET_CONTEXT_MGR already set ptrace attach of "/root/syz-executor0"[12064] was attempted by "/root/syz-executor0"[20791] ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' binder: 20792 RLIMIT_NICE not set binder: 20788:20799 ioctl 40046207 0 returned -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 20963:20976 ioctl 40046207 0 returned -16 binder_alloc: 20963: binder_alloc_buf, no vma binder: 20963:20965 transaction failed 29189/-3, size 0-0 line 2963 binder_alloc: 20963: binder_alloc_buf, no vma binder: 20963:20976 transaction failed 29189/-3, size 0-0 line 2963 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 71, process died. binder: undelivered transaction 70, process died. ipt_CLUSTERIP: no config found for 255.255.255.255, need 'new' ipt_CLUSTERIP: no config found for 255.255.255.255, need 'new' netlink: 'syz-executor3': attribute type 1 has an invalid length. binder: 21092:21104 BC_FREE_BUFFER u0000000000000000 no match netlink: 'syz-executor3': attribute type 1 has an invalid length. binder: 21092:21117 BC_FREE_BUFFER u0000000000000000 no match