====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc2+ #328 Not tainted ------------------------------------------------------ syz-executor7/13118 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [<000000000489496b>] __might_fault+0xe0/0x1d0 mm/memory.c:4570 but task is already holding lock: (ashmem_mutex){+.+.}, at: [<00000000cbdf6bb6>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] (ashmem_mutex){+.+.}, at: [<00000000cbdf6bb6>] 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-executor7/13118: #0: (ashmem_mutex){+.+.}, at: [<00000000cbdf6bb6>] ashmem_pin_unpin drivers/staging/android/ashmem.c:705 [inline] #0: (ashmem_mutex){+.+.}, at: [<00000000cbdf6bb6>] ashmem_ioctl+0x3db/0x11b0 drivers/staging/android/ashmem.c:782 stack backtrace: CPU: 1 PID: 13118 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 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:00007f4b63453c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4b634546d4 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 binder: 13152:13157 ioctl c018620b 20000040 returned -14 binder_alloc: binder_alloc_mmap_handler: 13152 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 13152:13189 ioctl 40046207 0 returned -16 binder: 13152:13157 got new transaction with bad transaction stack, transaction 40 has target 13152:0 binder: 13152:13157 transaction failed 29201/-71, size 0-0 line 2875 binder: release 13152:13157 transaction 40 out, still active binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29201 binder: send failed reply for transaction 40, target dead FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 1 PID: 13302 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_node mm/slab.c:3286 [inline] kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3629 create_task_io_context+0xb5/0x540 block/blk-ioc.c:271 get_task_io_context+0xdc/0x100 block/blk-ioc.c:335 set_task_ioprio+0x35d/0x4c0 block/ioprio.c:54 SYSC_ioprio_set block/ioprio.c:112 [inline] SyS_ioprio_set+0xaef/0xe10 block/ioprio.c:64 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f0ca3f07c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb RAX: ffffffffffffffda RBX: 00007f0ca3f086d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 00000000000003a0 R14: 00000000006f57a0 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 13325 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: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 __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_node mm/slab.c:3286 [inline] kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3629 create_task_io_context+0xb5/0x540 block/blk-ioc.c:271 get_task_io_context+0xdc/0x100 block/blk-ioc.c:335 set_task_ioprio+0x35d/0x4c0 block/ioprio.c:54 SYSC_ioprio_set block/ioprio.c:112 [inline] SyS_ioprio_set+0xaef/0xe10 block/ioprio.c:64 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f0ca3f07c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb RAX: ffffffffffffffda RBX: 00007f0ca3f086d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 00000000000003a0 R14: 00000000006f57a0 R15: 0000000000000001 CPU: 0 PID: 13333 Comm: syz-executor1 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 ptlock_alloc+0x24/0x70 mm/memory.c:4728 ptlock_init include/linux/mm.h:1796 [inline] pgtable_page_ctor include/linux/mm.h:1830 [inline] pte_alloc_one+0x59/0x100 arch/x86/mm/pgtable.c:32 do_huge_pmd_anonymous_page+0xc20/0x1b00 mm/huge_memory.c:689 create_huge_pmd mm/memory.c:3870 [inline] __handle_mm_fault+0x18d7/0x3b60 mm/memory.c:4074 handle_mm_fault+0x44a/0xb00 mm/memory.c:4140 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1426 do_page_fault+0xee/0x730 arch/x86/mm/fault.c:1501 page_fault+0x62/0x90 arch/x86/entry/entry_64.S:1122 RIP: 0010:copy_user_generic_unrolled+0x9e/0xc0 arch/x86/lib/copy_user_64.S:74 RSP: 0018:ffff8801ba147878 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 000000002078a008 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 000000002078a008 RDI: ffff8801ba147928 RBP: ffff8801ba1478a8 R08: ffffed0037428f25 R09: ffffed0037428f25 R10: 0000000000000001 R11: ffffed0037428f25 R12: 0000000000000001 R13: ffff8801ba147928 R14: 00007ffffffff000 R15: 000000002078a009 copy_from_user include/linux/uaccess.h:147 [inline] sg_ioctl+0x1dcc/0x2d90 drivers/scsi/sg.c:1073 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:00007f7d12144c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7d121456d4 RCX: 0000000000453de9 RDX: 000000002078a000 RSI: 0000000000000001 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 0000000000000178 R14: 00000000006f23e0 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 13356 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] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 getname_flags+0xcb/0x580 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:209 do_sys_open+0x2e7/0x6d0 fs/open.c:1053 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x40e0e1 RSP: 002b:00007f4b63453bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f4b634546d4 RCX: 000000000040e0e1 RDX: 00007f4b63453bec RSI: 0000000000000002 RDI: 00007f4b63453bd0 RBP: 000000000072bea0 R08: 0000000000000000 R09: 000000000000001c R10: 0000000000000011 R11: 0000000000000293 R12: 0000000000000013 R13: 000000000000063a R14: 00000000006f9610 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 13881 Comm: syz-executor5 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 anon_vma_chain_alloc mm/rmap.c:128 [inline] __anon_vma_prepare+0xbc/0x6b0 mm/rmap.c:182 anon_vma_prepare include/linux/rmap.h:153 [inline] do_huge_pmd_anonymous_page+0x1124/0x1b00 mm/huge_memory.c:678 create_huge_pmd mm/memory.c:3870 [inline] __handle_mm_fault+0x18d7/0x3b60 mm/memory.c:4074 handle_mm_fault+0x44a/0xb00 mm/memory.c:4140 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1426 do_page_fault+0xee/0x730 arch/x86/mm/fault.c:1501 page_fault+0x62/0x90 arch/x86/entry/entry_64.S:1122 RIP: 0010:__put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:68 RSP: 0018:ffff8801cf8dfd08 EFLAGS: 00010297 RAX: 0000000000000014 RBX: 00007fffffffeffd RCX: 0000000020000100 RDX: 0000000000000046 RSI: ffffc90002f27000 RDI: 0000000000000282 RBP: ffff8801cf8dfe00 R08: 0000000000000000 R09: 1ffff10039f1bf7e R10: ffff8801cf8dfbb8 R11: ffff8801cf36f448 R12: 1ffff10039f1bfa7 R13: 0000000000000014 R14: 0000000000000003 R15: 0000000000000015 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007feb66e09c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007feb66e0a6d4 RCX: 0000000000453de9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000002 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000013 R13: 00000000000005fb R14: 00000000006f9028 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 13919 Comm: syz-executor2 Not tainted 4.16.0-rc2+ #328 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 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_trace+0x4b/0x740 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] yama_ptracer_add+0xd4/0x740 security/yama/yama_lsm.c:150 yama_task_prctl+0x192/0x3c0 security/yama/yama_lsm.c:249 security_task_prctl+0x72/0xe0 security/security.c:1130 SYSC_prctl kernel/sys.c:2200 [inline] SyS_prctl+0x9f/0xc90 kernel/sys.c:2193 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007fc571f8cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fc571f8d6d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000059616d61 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 0000000000000446 R14: 00000000006f6730 R15: 0000000000000000 CPU: 1 PID: 13930 Comm: syz-executor4 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_fail_alloc_page mm/page_alloc.c:2959 [inline] prepare_alloc_pages mm/page_alloc.c:4198 [inline] __alloc_pages_nodemask+0x327/0xdd0 mm/page_alloc.c:4237 alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2055 alloc_pages include/linux/gfp.h:492 [inline] skb_page_frag_refill+0x358/0x5f0 net/core/sock.c:2208 tun_build_skb.isra.50+0x2f0/0x1850 drivers/net/tun.c:1627 tun_get_user+0x18fa/0x3810 drivers/net/tun.c:1798 tun_chr_write_iter+0xbd/0x1c0 drivers/net/tun.c:1984 call_write_iter include/linux/fs.h:1781 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_writev+0x18a/0x340 fs/read_write.c:977 do_writev+0xfc/0x2a0 fs/read_write.c:1012 SYSC_writev fs/read_write.c:1085 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1082 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453cc1 RSP: 002b:00007f0dc5e8fba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000072 RCX: 0000000000453cc1 RDX: 0000000000000001 RSI: 00007f0dc5e8fbf0 RDI: 0000000000000012 RBP: 0000000020625f8e R08: 0000000000000012 R09: 0000000000000000 R10: 0000000000000072 R11: 0000000000000293 R12: 0000000000000013 R13: 0000000000000612 R14: 00000000006f9250 R15: 0000000000000000 audit: type=1400 audit(1519595754.539:116): avc: denied { ioctl } for pid=14122 comm="syz-executor2" path="socket:[39689]" dev="sockfs" ino=39689 ioctlcmd=0x8903 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1 audit: type=1400 audit(1519595754.569:117): avc: denied { setopt } for pid=14122 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=netlink_crypto_socket permissive=1 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1400 audit(1519595756.149:118): avc: denied { read } for pid=14881 comm="syz-executor4" path="socket:[42581]" dev="sockfs" ino=42581 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1 audit: type=1400 audit(1519595756.305:119): avc: denied { map } for pid=14970 comm="syz-executor1" path="/dev/sg0" dev="devtmpfs" ino=1229 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:scsi_generic_device_t:s0 tclass=chr_file permissive=1 device syz4 entered promiscuous mode device syz4 left promiscuous mode